Encode JPEG, PNG, WebP, GIF or SVG images as Base64 data URLs, or paste a data URL to preview the decoded image, entirely in your browser.
Part of our Converters collection — Explore more Converters tools · See also: Unit & File Size Converter, JSON ↔ CSV Converter.
Quick answer: Image to Base64 — Encode & decode image data URLs Free, no signup, runs in your browser. See below for the interactive tool, 4-step guide and FAQs.
Choose an image to see its Base64.
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No. Files are read locally and turned into text on-device. For example, a 2 MB PNG stays in your tab. Encoding accepts files up to 10 MB, and closing the tab clears the selected file.
Yes. Paste a complete data URL to preview the image. The decoder accepts JPEG, PNG, WebP, GIF, SVG, BMP, AVIF and ICO data URLs up to 15 million characters, and no upload or account is used.
Yes. Encoding runs fully offline in your browser across 2 modes. For example, a 100 KB shot turns to ~133 KB text in 2 seconds on-device with no upload. Close tab to clear. Free with no account.
Base64 maps three binary bytes into four ASCII characters using 64-symbol alphabet, ensuring safe JSON and CSS passage. Thus 100 KB PNG becomes about 133 KB text, while 2 MB photo approaches 2.7 MB string. Our encoder streams FileReader bytes locally, inserts data:image/png;base64 prefix and copies result. Tiny icons suit embedding, whereas heroes bloat bundles.
Embed icons under 30 KB to eliminate requests and simplify demos, email templates, and offline prototypes. For example, 12 KB favicon as data URL loads instantly without cache setup. Link photos above 200 KB via separate WebP files with lazy loading to preserve speed. Our tool previews decoded URLs and keeps bytes on-device for privacy.
Data URLs inline binary artwork as ASCII text for stylesheets, scripts, JSON payloads, and portable HTML exports without separate requests. Example 1: drop 100 KB PNG logo, receive data:image/png;base64,iVBOR text around 133 KB ready for background declarations in landing pages. Example 2: embed 8 KB SVG icon set into React bundle to eliminate flicker during offline conference demos. Frontend engineers prototyping newsletters, educators sharing single-file assignments, and testers mocking avatars value portability. Encoding inflates size by one-third, so reserve technique for assets below 50 KB. All reads execute through FileReader locally, never uploading artwork, preserving confidentiality for unreleased screenshots. Designers ship email signatures, developers bundle favicons, and QA teams attach visual fixtures without external hosting dependencies daily. Track bundle budgets in code reviews to prevent performance regressions.
Encoding reads raw bytes, groups triplets, and maps each 6-bit chunk onto alphabet with padding for safe transport across text channels. Reference size table: 30 KB PNG becomes 40 KB URL suitable for embedding | 100 KB photo becomes 133 KB URL borderline | 500 KB image becomes 665 KB URL avoid | 2 MB picture becomes 2.7 MB URL never embed. Decoding reverses the process and previews the image from the data URL; it does not create a downloadable file. The data:image/...;base64, prefix is mandatory; an invalid prefix shows a warning instead of a preview. Edge case: 10 MB smartphone photos exhaust mobile memory and freeze tabs; downscale to 1920 pixels or convert to WebP beforehand for smoother handling. Copy outputs into variables, validate prefixes in reviews, document asset budgets clearly, and test dark-mode transparency thoroughly.
Example 1: choose 100 KB PNG dashboard icon, copy 133 KB data URL into CSS background property, reload page to confirm crisp retina rendering. Example 2: paste that URL into the decode pane and confirm the preview matches the original image. Edge case: animated GIFs retain frames but lose looping metadata in some browsers; test playback after round trip carefully. Limitation: tool neither compresses, resizes, crops, nor strips EXIF location tags; preprocess separately with editors beforehand. For generic text encoding explore utility at /base64-tool; for storage impact open the File Size tab at /unit-converter, both offline companions supporting performant delivery and privacy. Archive originals separately, track bundle growth in pull requests, prefer external files for photography, audit third-party templates regularly, and document decisions in performance budgets.