Decode QR codes from image uploads or your camera instantly in your browser. Read URLs, text or WiFi credentials processed locally — 100% private and offline.
Part of our Images & Design collection — Explore more Images & Design tools · See also: QR Code Generator, Image Editor: Compress, Resize, Crop & Border.
Quick answer: QR Scanner — Scan QR from image Free, no signup, runs in your browser. See below for the interactive tool, 4-step guide and FAQs.
Upload an image containing a QR code or use your camera to scan. Decoding runs locally via a lazy-loaded jsQR library (dynamic import).
No image loaded. Choose an image or start the camera to scan a QR code.
No QR code decoded yet. Upload a QR image or capture from camera.
Decoding: draw to canvas → getImageData → dynamic import("jsqr") → jsQR(data, width, height). If jsQR is missing, an alert with "jsQR not installed, install via npm install jsqr" is shown. Camera uses getUserMedia with permission handling; auto-scan via requestAnimationFrame and manual Capture button.Deep dives from the Tool4SaaS blog — tested workflows, print sizes and fixes.
Reviewed by the Tool4SaaS Editorial Team — In-house reviewers who build and test every tool locally for accuracy across current Chrome, Edge, Firefox, and Safari. Last updated: . See our authors, methodology or contact us.
File uploads decode fully offline via canvas and jsQR after lazy loading, while live camera requires permission through getUserMedia and adequate lighting. Sharp PNG screenshots up to 10MB and 2048 pixels decode after tight cropping. For encoding URLs afterward, build codes with our generator at /qr-code-generator locally.
No. Decoding processes canvas pixels locally after lazy-loaded jsQR initializes in-tab. Qr-photo.png containing https colon example.com menu decodes without network transfer for files. Camera frames also process on-device, though browser permission prompts are mandatory. Closing the tab clears imagery for privacy.
Sharp PNG or JPG screenshots up to 10MB and 2048 pixels decode best when cropped tightly without glare. Avoid curved cups, glossy reflections and sub-2cm prints that defeat older cameras. For example qr-photo.png at 1080 pixels decodes instantly, while crumpled receipts at 400 pixels fail. Crop and brighten before retrying.
Low light, motion blur, fixed focus and aggressive beautification filters degrade live frames below jsQR thresholds, whereas static screenshots remain pristine. Hold steady one second under bright lamps two meters from posters, disable filters, and tap to focus. Test 512-pixel proofs for handouts versus 2048-pixel proofs for posters across viewing distances.
Preview decoded https colon example.com menu text before opening links, since QR stickers can mask phishing destinations. Verify sender context for WiFi strings that auto-join networks and share passwords visibly. For trusted generation workflows afterward, encode verified URLs at /qr-code-generator locally without upload.
Decode QR codes from image uploads or live camera instantly in your browser with local processing for privacy. Upload qr-photo.png screenshots or activate camera to read URLs like https example.com menu, plain text or WiFi credentials. Example 1: scan a 5cm 512-pixel table card from 50cm to open lunch menus. Example 2: decode a 20cm 2048-pixel window poster from two meters to join guest networks. Commuters check transit posters, shoppers verify payments, and teams share contacts efficiently. File decoding runs fully offline via canvas and jsQR after lazy load, while camera requires permission and steady lighting. Workshops test codes spanning classroom walls measured in meters to teach distance-to-size relationships with hands-on scanning drills measuring distance in meters from posters to phones across hallways and lobbies.
Uploads process deterministically from pristine pixels, whereas camera reads depend on optics, motion and illumination in real time. Table — Input | Conditions | Outcome: qr-photo.png 1080px | tight crop | instant decode; 512px table card | 50cm distance | reliable; 2048px poster | two meters | reliable; curved cup | glare distortion | frequent fail; sub-2cm sticker | budget camera | frequent fail. Sharp PNG or JPG up to 10MB and 2048 pixels perform best when cropped tightly without reflections. Verify decoded previews before opening links to avoid phishing traps. Training sessions compare 512-pixel handouts against 2048-pixel wall posters across several meters to internalize the distance-divided-by-ten sizing guideline with practical measurements across 512-pixel cards and 2048-pixel posters in varied lighting including fluorescent offices, daylight windows and dim restaurant interiors.
Decoding only covers machine-readable patterns without generation, styling or analytics for campaign tracking. Edge case: damaged, low-contrast or overdense codes encoding 300-character URLs at stamp sizes defeat budget Android viewfinders even after enhancement, requiring reprints at larger dimensions. Limitation: no batch scanning or history log; each image processes individually. For creating verified menu links afterward, encode with our generator at /qr-code-generator. For auto-join WiFi tags with proper escaping, build at /qr-code-generator, free offline file handling with nothing uploaded. Teams archive tested proofs alongside print specifications for reliable reorders while logging print sizes, distances and success rates for venue staff including laminated distance charts posted near entrances and checkout counters and training refreshers each quarter covering new phone models and lighting setups.