# Tool4SaaS (184 free tools across 12 categories + guides)
> Updated: 2026-10-07 · visible count excludes 1 NOINDEX placeholder (pdf-compress, ships soon).

> Free, privacy-friendly online productivity and developer tools. Most run entirely in your browser with no account and no upload; 4 network tools (currency, YouTube thumbnails, SSL checker, voice input) need internet - see /privacy. 184 tools across 12 categories + pillar/cluster guides below. Full FAQ + step hints for AI citations: https://tool4saas.com/llms-full.txt

## Overview
- [Tool4SaaS](https://tool4saas.com/): Home page with all 184 free tools grouped by 12 categories.
- [About](https://tool4saas.com/about): What the site is and how it protects your privacy.
- [Privacy Policy](https://tool4saas.com/privacy): How user data is handled (it stays in your browser).
- [Terms](https://tool4saas.com/terms): Terms of use for all tools and guides.
- [Contact](https://tool4saas.com/contact): Contact the Tool4SaaS team.
- [Author](https://tool4saas.com/author): About the author behind Tool4SaaS.
- [Methodology](https://tool4saas.com/methodology): How we build and test tools.
- [Categories](https://tool4saas.com/category/text-documents): Browse tools by category.
- [Full tool + FAQ + steps dump](https://tool4saas.com/llms-full.txt): Every tool with its top FAQ questions and HowTo steps for AI citations.
- [Text & Documents](https://tool4saas.com/category/text-documents): Count words, convert case, clean text and compare documents with 19 free browser-based writing utilities for everyday editing.
- [Business & Writing](https://tool4saas.com/category/business): Create invoices, resumes, quotations and receipts instantly in your browser with 13 free business document generators.
- [Developer Tools](https://tool4saas.com/category/developer): Encode Base64, hash, format JSON and SQL, test regex and validate code with 30 free developer utilities that run locally.
- [Converters](https://tool4saas.com/category/converters): Convert units, currencies, YAML, JSON, CSV and number systems instantly with 13 free offline converters in one click.
- [Generators](https://tool4saas.com/category/generators): Generate strong passwords, UUIDs, random strings, favicons and robots.txt with 13 free privacy-friendly generator tools.
- [Images & Design](https://tool4saas.com/category/images-design): Generate QR codes, compress and resize images, extract colors and build gradients with 23 free design tools offline.
- [PDF Tools](https://tool4saas.com/category/pdf): Merge, split, compress and convert PDFs and images to PDF securely in your browser with 8 free offline PDF utilities.
- [Calculators](https://tool4saas.com/category/calculators): Calculate percentages, loans, grades, discounts and BMI instantly with 16 free everyday calculators that work offline.
- [Finance & Money](https://tool4saas.com/category/finance): Mortgage, SIP, salary and tax calculators for planning — 24 free tools, informational only, not financial advice.
- [Health & Fitness](https://tool4saas.com/category/health): Calorie, BMI and macro calculators for informational purposes only — not medical advice, consult a professional.
- [SEO & Marketing](https://tool4saas.com/category/seo): Generate meta tags, sitemaps, robots.txt and SERP previews to rank higher with 8 free SEO and marketing utilities offline.
- [Time & Date](https://tool4saas.com/category/time): Calculate age, workdays, timezones and durations with clocks, timers and converters in 8 free time and date utilities.

## Text & Documents
- [Word Counter](https://tool4saas.com/word-counter): Count words, characters & reading time
- [Case Converter](https://tool4saas.com/case-converter): UPPER, lower, Title, camel & more
- [Text Diff Checker](https://tool4saas.com/text-diff): Compare two texts side by side
- [List Tools](https://tool4saas.com/text-list): Sort, dedupe, shuffle & reverse
- [Find & Replace](https://tool4saas.com/text-find-replace): Find and replace text in bulk
- [Text Reverser](https://tool4saas.com/text-reverser): Reverse text, words or lines
- [Keyword Density Analyzer](https://tool4saas.com/keyword-density): Word frequency & density
- [Text to Speech](https://tool4saas.com/text-to-speech): Listen to your text aloud
- [Email Extractor](https://tool4saas.com/email-extractor): Pull emails from any text
- [Markdown Editor](https://tool4saas.com/markdown-editor): Write & preview markdown
- [Text Cleaner](https://tool4saas.com/text-cleaner): Trim & clean text
- [Readability Checker](https://tool4saas.com/readability-checker): Flesch & grade level
- [Text Summarizer](https://tool4saas.com/text-summarizer): Extractive summary
- [Grammar Checker](https://tool4saas.com/grammar-checker): Find grammar issues
- [AI Detector](https://tool4saas.com/ai-detector): Detect AI-written text
- [Plagiarism Checker](https://tool4saas.com/plagiarism-checker): Check uniqueness %
- [Typing Speed Test](https://tool4saas.com/typing-speed-test): WPM & accuracy
- [Speech to Text](https://tool4saas.com/speech-to-text): Free voice typing
- [Fancy Text Generator](https://tool4saas.com/fancy-text-generator): Bold, script & bubble

## Business & Writing
- [Invoice Generator](https://tool4saas.com/invoice-generator): Create & download professional invoices
- [Resume Builder](https://tool4saas.com/resume-builder): Build a clean resume and export to PDF
- [Commission Calculator](https://tool4saas.com/commission-calculator): Calculate sales commission
- [ATS Resume Checker](https://tool4saas.com/ats-resume-checker): Check resume vs job
- [Signature Maker](https://tool4saas.com/signature-maker): Draw & type signature
- [Quotation Generator](https://tool4saas.com/quotation-generator): Create quotations
- [Purchase Order Generator](https://tool4saas.com/purchase-order-generator): Create purchase orders
- [Cover Letter Builder](https://tool4saas.com/cover-letter-builder): Build cover letters
- [Receipt Generator](https://tool4saas.com/receipt-generator): Free PDF receipts
- [Offer Letter Generator](https://tool4saas.com/offer-letter-generator): Offer letter + CTC PDF
- [Payslip Generator](https://tool4saas.com/payslip-generator): Salary slip + net pay
- [Rent Receipt Generator](https://tool4saas.com/rent-receipt-generator): HRA rent receipts PDF
- [Freelance GST Invoice Generator](https://tool4saas.com/freelance-gst-invoice-generator): GST invoice + tax PDF

## Developer Tools
- [JSON Formatter](https://tool4saas.com/json-formatter): Format, validate & minify JSON
- [Base64 Encode / Decode](https://tool4saas.com/base64-tool): Encode and decode Base64 text
- [URL Encoder / Decoder](https://tool4saas.com/url-encoder): Encode & decode URL components
- [Hash Generator](https://tool4saas.com/hash-generator): SHA-1 / 256 / 512 of any text
- [Base Converter](https://tool4saas.com/base-converter): Binary, hex, decimal & more
- [HTML Entity Encoder](https://tool4saas.com/html-entities): Encode & decode HTML entities
- [Regex Tester](https://tool4saas.com/regex-tester): Test JavaScript regular expressions
- [JWT Decoder](https://tool4saas.com/jwt-decoder): Decode JSON Web Tokens safely
- [MIME Type Lookup](https://tool4saas.com/mime-type-lookup): File extension ↔ MIME
- [JSON to YAML](https://tool4saas.com/json-to-yaml): Convert JSON into YAML
- [HTML Beautifier](https://tool4saas.com/html-beautifier): Pretty-print HTML
- [Credit Card Validator](https://tool4saas.com/credit-card-validator): Luhn check & brand
- [Password Strength Checker](https://tool4saas.com/password-strength): Rate your password
- [Code Minifier](https://tool4saas.com/code-minifier): Minify JS, CSS & HTML
- [Screen Resolution](https://tool4saas.com/screen-resolution): Detect screen metrics
- [XML Formatter](https://tool4saas.com/xml-formatter): Format & validate XML
- [Cron Parser](https://tool4saas.com/cron-parser): Explain cron expressions
- [CSS Beautifier](https://tool4saas.com/css-beautifier): Format CSS nicely
- [YAML to JSON](https://tool4saas.com/yaml-to-json): Convert YAML to JSON
- [JSON Tree Viewer](https://tool4saas.com/json-tree-viewer): Explore JSON as tree
- [SSL Checker](https://tool4saas.com/ssl-checker): Check SSL certificate
- [SQL Formatter](https://tool4saas.com/sql-formatter): Format SQL queries
- [Subnet Calculator](https://tool4saas.com/subnet-calculator): IPv4 network calc
- [Chmod Calculator](https://tool4saas.com/chmod-calculator): Octal + symbolic
- [Code to Image](https://tool4saas.com/code-to-image): Pretty code PNG
- [HMAC Generator](https://tool4saas.com/hmac-generator): HMAC SHA auth codes
- [AES Encryptor](https://tool4saas.com/aes-encryptor): Encrypt with password
- [JS Beautifier](https://tool4saas.com/js-beautifier): Format JS nicely
- [OTP Generator (TOTP 2FA)](https://tool4saas.com/otp-generator): 30-sec 2FA codes
- [AI Token Counter](https://tool4saas.com/ai-token-counter): Tokens + API cost

## Converters
- [Unit Converter](https://tool4saas.com/unit-converter): Convert length, weight, temp & more
- [JSON ↔ CSV Converter](https://tool4saas.com/json-csv): Convert between JSON and CSV
- [URL Parser](https://tool4saas.com/url-parser): Break down any URL
- [Number to Words](https://tool4saas.com/number-to-words): Spell out numbers in English
- [Roman Numeral Converter](https://tool4saas.com/roman-numeral): Roman ↔ Arabic numbers
- [Image to Base64](https://tool4saas.com/image-to-base64): Encode & decode image data URLs
- [CSV Viewer](https://tool4saas.com/csv-viewer): View, sort & filter CSV
- [Morse Code Translator](https://tool4saas.com/morse-translator): Text ↔ Morse code
- [ASCII / Hex / Binary Converter](https://tool4saas.com/ascii-converter): Text ↔ codes
- [File Size Converter](https://tool4saas.com/file-size-converter): Bytes, KB, MB, GB
- [JSON to Excel](https://tool4saas.com/json-to-excel): JSON → XLS download
- [ZIP Creator](https://tool4saas.com/zip-creator): Create ZIP files
- [Currency Converter](https://tool4saas.com/currency-converter): Live rates + offline

## Generators
- [Password Generator](https://tool4saas.com/password-generator): Strong random passwords
- [Lorem Ipsum Generator](https://tool4saas.com/lorem-ipsum): Placeholder text
- [Slug Generator](https://tool4saas.com/slug-generator): Turn titles into URL slugs
- [Random Number Generator](https://tool4saas.com/random-number): Secure random numbers & lists
- [UUID Generator](https://tool4saas.com/uuid-generator): Generate v4 UUIDs in bulk
- [Random String Generator](https://tool4saas.com/random-string): Secure random strings & keys
- [Dice Roller](https://tool4saas.com/dice-roller): Roll virtual dice
- [Coin Flip](https://tool4saas.com/coin-flip): Flip a fair coin
- [Random Passphrase](https://tool4saas.com/random-passphrase): Generate secure passphrase
- [Random Hex Color](https://tool4saas.com/random-hex-color): Generate random hex colors
- [Barcode Generator](https://tool4saas.com/barcode-generator): CODE128, EAN13, UPC
- [Fake Data Generator](https://tool4saas.com/fake-data-generator): Generate test data
- [Business Name Generator](https://tool4saas.com/business-name-generator): Ideas & filters

## Images & Design
- [QR Code Generator](https://tool4saas.com/qr-code-generator): Generate QR codes for links, text & more
- [Image Compressor](https://tool4saas.com/image-compressor): Shrink images without uploading
- [Color Converter](https://tool4saas.com/color-converter): HEX, RGB & HSL conversions
- [Color Contrast Checker](https://tool4saas.com/color-contrast): WCAG contrast for any two colors
- [Gradient Generator](https://tool4saas.com/gradient-generator): Design CSS gradients visually
- [Favicon Generator](https://tool4saas.com/favicon-generator): Make a favicon from text or emoji
- [Color Palette Generator](https://tool4saas.com/color-palette): Harmonies from any color
- [Image Resizer](https://tool4saas.com/image-resizer): Resize images in browser
- [Image Border](https://tool4saas.com/image-border): Add borders to images
- [Image Format Converter](https://tool4saas.com/image-format-converter): WebP, PNG, JPG, AVIF
- [SVG Optimizer](https://tool4saas.com/svg-optimizer): Shrink SVG files
- [EXIF Viewer](https://tool4saas.com/exif-viewer): Read image metadata
- [Color Shades Generator](https://tool4saas.com/color-shades-generator): Shades & tints
- [YouTube Thumbnail Downloader](https://tool4saas.com/youtube-thumbnail-downloader): Grab YT thumbnails
- [Image Color Extractor](https://tool4saas.com/image-color-extractor): Extract 5 colors
- [QR Scanner](https://tool4saas.com/qr-scanner): Scan QR from image
- [CMYK Converter](https://tool4saas.com/cmyk-converter): HEX, RGB ↔ CMYK
- [WiFi QR Generator](https://tool4saas.com/wifi-qr-generator): QR for guest WiFi
- [Image Cropper](https://tool4saas.com/image-cropper): Crop to pixels/ratio
- [CSS Box Shadow Generator](https://tool4saas.com/css-box-shadow-generator): Shadow CSS live
- [CSS Border Radius Generator](https://tool4saas.com/css-border-radius-generator): Radius CSS live
- [CSS Clip Path Generator](https://tool4saas.com/css-clip-path-generator): Clip shapes live
- [SVG to PNG Converter](https://tool4saas.com/svg-to-png-converter): Crisp PNG export

## PDF Tools
- [Image to PDF](https://tool4saas.com/image-to-pdf): Images → PDF
- [PDF Merge](https://tool4saas.com/pdf-merge): Merge multiple PDFs
- [PDF Splitter](https://tool4saas.com/pdf-split): Extract pages
- [PDF to JPG](https://tool4saas.com/pdf-to-jpg): Pages to images
- [Rotate PDF Pages](https://tool4saas.com/pdf-rotate): Rotate all pages
- [PDF Watermark](https://tool4saas.com/pdf-watermark): Add text watermark
- [PDF to Text](https://tool4saas.com/pdf-to-text): Extract text pages

## Calculators
- [Percentage Calculator](https://tool4saas.com/percentage-calculator): X% of Y & what percent
- [BMI Calculator](https://tool4saas.com/bmi-calculator): Body Mass Index in metric & imperial
- [Tip Calculator](https://tool4saas.com/tip-calculator): Split bills & calculate tips
- [Loan Calculator](https://tool4saas.com/loan-calculator): Monthly payment & interest
- [Discount Calculator](https://tool4saas.com/discount-calculator): Sale price & savings
- [GST / VAT Calculator](https://tool4saas.com/gst-calculator): Tax inclusive & exclusive
- [Percentage Change](https://tool4saas.com/percentage-change): Old-to-new % change & growth
- [Percentage Difference](https://tool4saas.com/percentage-difference): Absolute |A-B|/avg difference
- [Work Days Calculator](https://tool4saas.com/work-days-calculator): Calculate business days
- [GPA Calculator](https://tool4saas.com/gpa-calculator): Grade point average
- [Scientific Calculator](https://tool4saas.com/scientific-calculator): Trig, logs, powers
- [Time Duration Calculator](https://tool4saas.com/time-duration-calculator): HH:MM duration
- [Fraction Calculator](https://tool4saas.com/fraction-calculator): Add, subtract fractions
- [Final Grade Calculator](https://tool4saas.com/grade-calculator): What final do I need?
- [Concrete Calculator](https://tool4saas.com/concrete-calculator): Yards + bags needed
- [US Sales Tax Calculator](https://tool4saas.com/us-sales-tax-calculator): State tax + total

## Finance & Money
- [Mortgage Calculator](https://tool4saas.com/mortgage-calculator): EMI & amortization schedule
- [Compound Interest Calculator](https://tool4saas.com/compound-interest-calculator): Maturity & interest growth
- [Salary Calculator](https://tool4saas.com/salary-calculator): Take-home pay estimates
- [Profit Margin Calculator](https://tool4saas.com/profit-margin-calculator): Calculate margin & markup
- [Income Tax Calculator](https://tool4saas.com/income-tax-calculator): Net pay after taxes
- [Inflation Calculator](https://tool4saas.com/inflation-calculator): Future purchasing power
- [SIP Calculator](https://tool4saas.com/sip-calculator): SIP maturity & gains
- [Simple Interest Calculator](https://tool4saas.com/simple-interest-calculator): Interest & total cost
- [Retirement Calculator](https://tool4saas.com/retirement-calculator): Plan your savings goal
- [Auto Loan Calculator](https://tool4saas.com/auto-loan-calculator): EMI & total cost
- [Rent vs Buy Calculator](https://tool4saas.com/rent-vs-buy-calculator): Rent or buy?
- [Freelance Rate Calculator](https://tool4saas.com/freelance-rate-calculator): Hourly & project rates
- [Home Affordability Calculator](https://tool4saas.com/home-affordability-calculator): How much house?
- [Refinance Calculator](https://tool4saas.com/refinance-calculator): Break-even refi
- [CAGR Calculator](https://tool4saas.com/cagr-calculator): Growth rate + multiple
- [EMI Calculator](https://tool4saas.com/emi-calculator): Loan EMI + interest cost
- [Home Loan Eligibility India](https://tool4saas.com/home-loan-eligibility-india): Max loan by salary
- [Mortgage Overpayment Calculator](https://tool4saas.com/mortgage-overpayment-calculator): Extra pay savings
- [US Paycheck Calculator 2026](https://tool4saas.com/us-paycheck-calculator): Take-home per pay
- [In-Hand Salary Calculator India FY 2026-27](https://tool4saas.com/in-hand-salary-india): CTC to monthly in-hand
- [FD Calculator India](https://tool4saas.com/fd-calculator): FD maturity quarterly
- [PPF Calculator India 7.1%](https://tool4saas.com/ppf-calculator): PPF 15-year maturity
- [Debt Payoff Calculator](https://tool4saas.com/debt-payoff-calculator): Snowball vs avalanche
- [Capital Gains Tax Calculator India](https://tool4saas.com/capital-gains-tax-india): LTCG STCG plus cess

## Health & Fitness
- [Calorie Calculator](https://tool4saas.com/calorie-calculator): BMR, TDEE & macros
- [Water Intake Calculator](https://tool4saas.com/water-intake-calculator): Daily water needs
- [Ideal Weight Calculator](https://tool4saas.com/ideal-weight-calculator): Healthy weight range
- [Macro Calculator](https://tool4saas.com/macro-calculator): Protein, carbs & fat
- [Pregnancy Calculator](https://tool4saas.com/pregnancy-calculator): Due date & trimesters
- [Ovulation Calculator](https://tool4saas.com/ovulation-calculator): Fertile window
- [Sleep Calculator](https://tool4saas.com/sleep-cycle-calculator): Best bedtime & wake
- [Body Fat Calculator](https://tool4saas.com/body-fat-calculator): US Navy method
- [Period Calculator](https://tool4saas.com/period-calculator): Next period + fertile
- [One-Rep Max Calculator](https://tool4saas.com/one-rep-max-calculator): Epley + Brzycki

## SEO & Marketing
- [Sitemap Generator](https://tool4saas.com/sitemap-generator): XML sitemap builder
- [Robots.txt Generator](https://tool4saas.com/robots-txt-generator): Generate robots.txt
- [Open Graph Preview](https://tool4saas.com/open-graph-preview): Preview social cards
- [SERP Preview](https://tool4saas.com/serp-preview): Google snippet preview
- [UTM Builder](https://tool4saas.com/utm-builder): GA4 campaign links
- [Meta Tag Generator](https://tool4saas.com/meta-tag-generator): SEO + OG tags
- [FAQ Schema Generator](https://tool4saas.com/faq-schema-generator): JSON-LD FAQs
- [SEO Analyzer](https://tool4saas.com/seo-analyzer): RankMath-style SEO score

## Time & Date
- [Age Calculator](https://tool4saas.com/age-calculator): Find your exact age & next birthday
- [Timestamp Converter](https://tool4saas.com/timestamp-converter): Epoch ↔ human-readable date
- [Date Calculator](https://tool4saas.com/date-calculator): Add days or find the difference
- [Timezone Converter](https://tool4saas.com/timezone-converter): Convert times across zones
- [Stopwatch Timer](https://tool4saas.com/stopwatch): Accurate online stopwatch
- [Countdown Timer](https://tool4saas.com/countdown-timer): Days until any date
- [World Clock](https://tool4saas.com/world-clock): Time in world cities
- [Pomodoro Timer](https://tool4saas.com/pomodoro-timer): Focus & break cycles

## Guides & Blog
- [All Guides](https://tool4saas.com/blog): View all long-form tool guides and tutorials.
- [Compress JPG to 100KB for Online Forms (UPSC/SSC Guide)](https://tool4saas.com/blog/image-compressor-guide/compress-jpg-100kb-portal) (updated 2026-10-07)
- [PNG vs JPG vs WebP: Which Format to Use](https://tool4saas.com/blog/image-compressor-guide/png-vs-jpg-vs-webp) (updated 2026-10-07)
- [Resize Images to Exact Pixels Without Blur](https://tool4saas.com/blog/image-compressor-guide/resize-image-exact-pixels) (updated 2026-10-07)
- [PNG to WebP Without Losing Transparency](https://tool4saas.com/blog/image-compressor-guide/png-to-webp-transparency) (updated 2026-10-07)
- [Optimize SVG Logos Without Breaking Them](https://tool4saas.com/blog/image-compressor-guide/optimize-svg-logos) (updated 2026-10-07)
- [Strip EXIF Data Before Uploading Photos](https://tool4saas.com/blog/image-compressor-guide/strip-exif-before-upload) (updated 2026-10-07)
- [Image SEO: Size, Alt Text and Dimensions](https://tool4saas.com/blog/image-compressor-guide/image-seo-size-alt) (updated 2026-10-07)
- [Crop Passport Photos to Exact Size at Home](https://tool4saas.com/blog/image-compressor-guide/crop-passport-photos) (updated 2026-10-07)
- [Compress Images for Web Without Losing Quality: 80% Guide](https://tool4saas.com/blog/image-compressor-guide): Pillar guide. (updated 2026-10-07)
- [How to Create an Invoice Online Free in 5 Steps (PDF, No Signup)](https://tool4saas.com/blog/invoice-generator-guide/how-to-create-invoice-online) (updated 2026-09-18)
- [GST Invoice Format India: Mandatory Fields, HSN & Sample (2026)](https://tool4saas.com/blog/invoice-generator-guide/gst-invoice-format-india) (updated 2026-09-18)
- [Freelancer Invoice Guide: What to Include & Get Paid on Time](https://tool4saas.com/blog/invoice-generator-guide/freelancer-invoice-guide) (updated 2026-09-18)
- [Small Business Invoicing Without Paid Software: Complete Setup](https://tool4saas.com/blog/invoice-generator-guide/small-business-invoicing) (updated 2026-09-28)
- [Free Invoice Template Guide: Word, Excel, PDF & Printable (2026)](https://tool4saas.com/blog/invoice-generator-guide/invoice-template-formats) (updated 2026-09-18)
- [Invoice vs Quotation vs Receipt vs Purchase Order: Key Differences](https://tool4saas.com/blog/invoice-generator-guide/invoice-vs-quotation-vs-receipt) (updated 2026-09-18)
- [Invoice Numbering: GST-Compliant Formats, HSN & Tax Fields (2026)](https://tool4saas.com/blog/invoice-generator-guide/invoice-numbering) (updated 2026-09-18)
- [Invoice Payment Terms + Follow-Up Scripts That Get You Paid Faster](https://tool4saas.com/blog/invoice-generator-guide/payment-terms-and-followups) (updated 2026-09-18)
- [12 Invoice Mistakes That Delay Payment (and How to Fix Them)](https://tool4saas.com/blog/invoice-generator-guide/invoicing-mistakes-to-avoid) (updated 2026-09-18)
- [Free Invoice Generator Guide: Create Professional Invoices in Minutes](https://tool4saas.com/blog/invoice-generator-guide): Pillar guide. (updated 2026-09-18)
- [Why JSON.parse Fails: Trailing Commas and Quotes](https://tool4saas.com/blog/json-formatter-guide/json-parse-errors) (updated 2026-10-07)
- [Base64 URL-Safe vs Standard: Padding and Modes](https://tool4saas.com/blog/json-formatter-guide/base64-url-safe-vs-standard) (updated 2026-10-07)
- [SHA-256 vs MD5: When to Use Which Hash](https://tool4saas.com/blog/json-formatter-guide/sha256-vs-md5-hashes) (updated 2026-10-07)
- [Seed Test Databases With UUIDs (No Collisions)](https://tool4saas.com/blog/json-formatter-guide/uuid-seed-test-database) (updated 2026-10-07)
- [Regex Flags and Capture Groups That Work](https://tool4saas.com/blog/json-formatter-guide/regex-flags-capture-groups) (updated 2026-10-07)
- [Check JWT Expiry Without Trusting the Token](https://tool4saas.com/blog/json-formatter-guide/jwt-expiry-without-trust) (updated 2026-10-07)
- [URL Encoding: Spaces, Symbols and Double-Escape Bugs](https://tool4saas.com/blog/json-formatter-guide/url-encoding-spaces-symbols) (updated 2026-10-07)
- [Debug API Responses Locally: JSON, Base64, JWT, Regex Guide](https://tool4saas.com/blog/json-formatter-guide): Pillar guide. (updated 2026-10-07)
- [How to Calculate Mortgage Payment: Formula + Examples (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/how-to-calculate-mortgage-payment) (updated 2026-09-24)
- [How Much House Can I Afford? 28/36 Rule Explained (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/how-much-house-can-i-afford) (updated 2026-09-24)
- [15 vs 30 Year Mortgage: Interest, Payoff & When 15 Wins (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/15-vs-30-year-mortgage) (updated 2026-09-28)
- [Should I Refinance? Break-Even Rule + Checklist (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/should-i-refinance-my-mortgage) (updated 2026-09-28)
- [Extra Mortgage Payments: Interest Saved & 10% Rules (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/mortgage-overpayment-extra-payment) (updated 2026-09-24)
- [Home Loan EMI & Eligibility India: CIBIL, FOIR, Prepayment (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/home-loan-emi-eligibility-india) (updated 2026-09-24)
- [Mortgage Amortization Schedule: How Payments Split (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/mortgage-amortization-schedule) (updated 2026-09-24)
- [Down Payment & PMI: 20% Rule, Costs & Strategy (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/down-payment-pmi-cost) (updated 2026-09-28)
- [Rent vs Buy a House: 5% Rule + Break-Even Math (2026)](https://tool4saas.com/blog/mortgage-calculator-guide/rent-vs-buy-house) (updated 2026-09-24)
- [Mortgage Calculator Guide: Payments, PMI & Amortization](https://tool4saas.com/blog/mortgage-calculator-guide): Pillar guide. (updated 2026-09-24)
- [How to Create a Strong Password: The 16-Character Rule (2026)](https://tool4saas.com/blog/password-generator-guide/how-to-create-strong-password) (updated 2026-09-25)
- [What Makes a Password Strong? Length, Entropy & Blacklists (2026)](https://tool4saas.com/blog/password-generator-guide/what-makes-password-strong) (updated 2026-09-25)
- [Password Strength Tester: Check Without Uploading (2026)](https://tool4saas.com/blog/password-generator-guide/password-strength-tester) (updated 2026-09-25)
- [Passphrase vs Password: When 5 Words Beat 12 Characters (2026)](https://tool4saas.com/blog/password-generator-guide/passphrase-vs-password) (updated 2026-09-25)
- [How to Remember Passwords Without Reusing Them (2026)](https://tool4saas.com/blog/password-generator-guide/how-to-remember-passwords) (updated 2026-09-25)
- [Random Password Ideas: Patterns to Generate (Never Copy) 2026](https://tool4saas.com/blog/password-generator-guide/random-password-ideas) (updated 2026-09-28)
- [What to Do After a Data Breach: 7-Step Checklist (2026)](https://tool4saas.com/blog/password-generator-guide/what-to-do-after-data-breach) (updated 2026-09-28)
- [2FA vs Passkeys: Strength Ladder + Setup Order (2026)](https://tool4saas.com/blog/password-generator-guide/2fa-vs-passkeys) (updated 2026-09-28)
- [Strong Wi-Fi & Router Passwords: Practical Setup (2026)](https://tool4saas.com/blog/password-generator-guide/wifi-router-password) (updated 2026-09-25)
- [How to Generate a Strong Password (Free Offline Tool)](https://tool4saas.com/blog/password-generator-guide): Pillar guide. (updated 2026-09-25)
- [Merge Multiple PDFs in Order (Cover + Chapters)](https://tool4saas.com/blog/pdf-merge-guide/merge-multiple-pdfs-order) (updated 2026-10-07)
- [JPG Scans to Single PDF: A4 Size + Order Guide](https://tool4saas.com/blog/pdf-merge-guide/jpg-scans-single-pdf) (updated 2026-10-07)
- [Extract PDF Pages by Range: 1-3,5 Syntax Guide](https://tool4saas.com/blog/pdf-merge-guide/extract-pages-range) (updated 2026-10-07)
- [Compress PDF to 1MB for Email and Portals](https://tool4saas.com/blog/pdf-merge-guide/compress-pdf-1mb-email) (updated 2026-10-07)
- [Convert PDF Pages to High-Quality JPG Images](https://tool4saas.com/blog/pdf-merge-guide/pdf-pages-high-quality-jpg) (updated 2026-10-07)
- [Fix Sideways Scans: Rotate PDF Pages Upright](https://tool4saas.com/blog/pdf-merge-guide/fix-sideways-scans) (updated 2026-10-07)
- [Add DRAFT Watermark to PDF Without Blocking Text](https://tool4saas.com/blog/pdf-merge-guide/add-draft-watermark) (updated 2026-10-07)
- [Extract Text From PDF Without OCR (When It Works)](https://tool4saas.com/blog/pdf-merge-guide/extract-text-without-ocr) (updated 2026-10-07)
- [Manage PDFs Offline: Merge, Split, Compress Without Uploading](https://tool4saas.com/blog/pdf-merge-guide): Pillar guide. (updated 2026-10-07)
- [How to Create a QR Code Free in 60 Seconds (PNG, No Signup)](https://tool4saas.com/blog/qr-code-generator-guide/how-to-create-qr-code) (updated 2026-09-22)
- [WiFi QR Code: Share Guest WiFi With One Scan (2026)](https://tool4saas.com/blog/qr-code-generator-guide/wifi-qr-code-guide) (updated 2026-09-22)
- [QR Codes for Small Business: 6 Placements That Pay (2026)](https://tool4saas.com/blog/qr-code-generator-guide/qr-code-for-business) (updated 2026-09-22)
- [QR Code vs Barcode: Differences & When to Use Each (2026)](https://tool4saas.com/blog/qr-code-generator-guide/qr-code-vs-barcode) (updated 2026-09-22)
- [QR Code Size Guide: Minimum Sizes for Print & Distance (2026)](https://tool4saas.com/blog/qr-code-generator-guide/qr-code-size-print-guide) (updated 2026-09-22)
- [QR Code Not Scanning? 5 Causes & Fixes That Work (2026)](https://tool4saas.com/blog/qr-code-generator-guide/qr-code-not-scanning-fix) (updated 2026-09-22)
- [vCard QR Code: Digital Business Card That Saves in 5 Seconds](https://tool4saas.com/blog/qr-code-generator-guide/vcard-contact-qr-code) (updated 2026-09-22)
- [UPI QR Code for Payments: Setup, Counter Tips & Safety (India)](https://tool4saas.com/blog/qr-code-generator-guide/upi-payment-qr-code-india) (updated 2026-09-22)
- [Static vs Dynamic QR Codes: Which to Choose (Honest Guide)](https://tool4saas.com/blog/qr-code-generator-guide/static-vs-dynamic-qr-codes) (updated 2026-09-22)
- [Free QR Code Generator Guide: Create Scannable QR Codes Fast](https://tool4saas.com/blog/qr-code-generator-guide): Pillar guide. (updated 2026-09-22)
- [How to Make a Resume in 15 Minutes + Tailor It Per Job (2026)](https://tool4saas.com/blog/resume-builder-guide/how-to-make-resume) (updated 2026-09-23)
- [Resume Format Guide: Sections, Order & India/US/UK Norms (2026)](https://tool4saas.com/blog/resume-builder-guide/resume-format-guide) (updated 2026-09-28)
- [ATS-Friendly Resume: Beat Applicant Tracking Software (2026)](https://tool4saas.com/blog/resume-builder-guide/ats-resume-guide) (updated 2026-09-23)
- [Fresher Resume Guide: Get Interviews With Zero Experience (2026)](https://tool4saas.com/blog/resume-builder-guide/fresher-resume-guide) (updated 2026-09-23)
- [Resume for Experienced Professionals: Positioning That Wins (2026)](https://tool4saas.com/blog/resume-builder-guide/experienced-resume-guide) (updated 2026-09-23)
- [Resume vs CV vs Biodata: Differences & When to Use Each (2026)](https://tool4saas.com/blog/resume-builder-guide/resume-vs-cv) (updated 2026-09-23)
- [Cover Letter Guide: 4-Paragraph Format That Wins Shortlists (2026)](https://tool4saas.com/blog/resume-builder-guide/cover-letter-guide) (updated 2026-09-23)
- [7 Resume Mistakes That Kill Interviews (With Before/After Fixes)](https://tool4saas.com/blog/resume-builder-guide/resume-mistakes) (updated 2026-09-23)
- [Offer Letter Guide: CTC Math, Clauses & Negotiation (India, 2026)](https://tool4saas.com/blog/resume-builder-guide/offer-letter-guide) (updated 2026-09-23)
- [Free Resume Builder Guide: Build a Job-Winning Resume Fast](https://tool4saas.com/blog/resume-builder-guide): Pillar guide. (updated 2026-09-23)
- [Fix SEO Score From 60 to 80: Worked Example](https://tool4saas.com/blog/seo-analyzer-guide/fix-score-60-to-80) (updated 2026-10-07)
- [Title and Meta Lengths That Avoid Truncation (2026)](https://tool4saas.com/blog/seo-analyzer-guide/title-meta-length-2026) (updated 2026-10-07)
- [Split Large Sitemaps Search Console Accepts](https://tool4saas.com/blog/seo-analyzer-guide/split-large-sitemap) (updated 2026-10-07)
- [Robots.txt vs Noindex: When to Use Each](https://tool4saas.com/blog/seo-analyzer-guide/robots-vs-noindex) (updated 2026-10-07)
- [Fix Stale LinkedIn and Social Preview Images](https://tool4saas.com/blog/seo-analyzer-guide/stale-og-image-fix) (updated 2026-10-07)
- [Name UTM Campaigns Without Splitting Reports](https://tool4saas.com/blog/seo-analyzer-guide/utm-naming-governance) (updated 2026-10-07)
- [Check AI Content Without False Positives](https://tool4saas.com/blog/seo-analyzer-guide/ai-content-false-positives) (updated 2026-10-07)
- [GEO Checklist: Get Cited by AI Search in 2026](https://tool4saas.com/blog/seo-analyzer-guide/geo-checklist-ai-citations) (updated 2026-10-07)
- [Score 80+ On-Page SEO Without a Plugin: 11 Checks](https://tool4saas.com/blog/seo-analyzer-guide): Pillar guide. (updated 2026-10-07)
- [₹5,000 SIP in 10/15/20 Years at 12% (With Step-Up)](https://tool4saas.com/blog/sip-calculator-guide/sip-5000-10-years) (updated 2026-10-07)
- [Lump Sum Compounding: Monthly vs Yearly Rests](https://tool4saas.com/blog/sip-calculator-guide/lumpsum-compounding-frequency) (updated 2026-10-07)
- [FD Quarterly Compounding, TDS and Penalties (2026)](https://tool4saas.com/blog/sip-calculator-guide/fd-quarterly-tds) (updated 2026-10-07)
- [PPF After 15 Years: Extend, Withdraw or Close?](https://tool4saas.com/blog/sip-calculator-guide/ppf-extend-15-years) (updated 2026-10-07)
- [Old vs New Tax Regime for Salaried in 2026](https://tool4saas.com/blog/sip-calculator-guide/old-vs-new-regime-2026) (updated 2026-10-07)
- [Real vs Nominal Returns: Inflation-Adjusted Math](https://tool4saas.com/blog/sip-calculator-guide/real-return-inflation) (updated 2026-10-07)
- [How Much SIP for ₹1 Crore? Start-Age Math](https://tool4saas.com/blog/sip-calculator-guide/sip-1-crore-goal) (updated 2026-10-07)
- [Equity LTCG vs FD Tax: Post-Tax Keep Rates](https://tool4saas.com/blog/sip-calculator-guide/equity-ltcg-vs-fd-tax) (updated 2026-10-07)
- [Budget 2026 Verdict: What Changed for Salaried Savers](https://tool4saas.com/blog/sip-calculator-guide/budget-2026-verdict-salaried) (updated 2026-10-07)
- [SIP vs FD vs PPF: Where Should ₹5,000/Month Go (2026)](https://tool4saas.com/blog/sip-calculator-guide): Pillar guide. (updated 2026-10-07)
- [How to Count Words Online Free (No Signup)](https://tool4saas.com/blog/word-counter-guide/how-to-count-words-online) (updated 2026-09-26)
- [How Long Should a Blog Post Be? Intent, Coverage and Limits](https://tool4saas.com/blog/word-counter-guide/ideal-blog-post-length-seo) (updated 2026-09-26)
- [Flesch Reading Ease Score Explained: Formula and Bands](https://tool4saas.com/blog/word-counter-guide/flesch-reading-ease-score-explained) (updated 2026-09-26)
- [Keyword Density Explained: How to Check and Fix Stuffing](https://tool4saas.com/blog/word-counter-guide/keyword-density-seo-check) (updated 2026-09-26)
- [How to Summarize Text Fast: Extractive Method](https://tool4saas.com/blog/word-counter-guide/how-to-summarize-text-fast) (updated 2026-09-26)
- [Lorem Ipsum: When to Use Placeholder Text](https://tool4saas.com/blog/word-counter-guide/lorem-ipsum-generator-use) (updated 2026-09-26)
- [Reading and Typing Speed: WPM Math and Practice Tips](https://tool4saas.com/blog/word-counter-guide/typing-speed-test-practice-tips) (updated 2026-09-26)
- [Grammar Check Before You Publish: Self-Editing Checklist](https://tool4saas.com/blog/word-counter-guide/grammar-check-before-publish) (updated 2026-09-26)
- [Proofread by Listening: Text-to-Speech Workflow](https://tool4saas.com/blog/word-counter-guide/text-to-speech-proofreading-use) (updated 2026-09-26)
- [Word Counter Guide: Count Words, Reading Time & Readability Free, No Signup](https://tool4saas.com/blog/word-counter-guide): Pillar guide. (updated 2026-09-26)

## Site
- [Sitemap](https://tool4saas.com/sitemap.xml): Machine-readable list of all pages.
- [Robots](https://tool4saas.com/robots.txt): Crawler directives.
- [LLMs full](https://tool4saas.com/llms-full.txt): Full FAQ + HowTo step hints per tool.