Does my image leave the browser?

No. Encoding uses the browser FileReader API (readAsDataURL). There is no upload endpoint. You can confirm in DevTools → Network that converting an image creates no outgoing request with the file.

How do I convert an image to Base64 online?

Drop or pick an image (or paste a screenshot), then copy the Raw Base64 or Data URL tab. Everything runs client-side.

Can I convert Base64 back to an image?

Yes. Switch to Base64 → Image, paste a data:image/...;base64,... string or raw Base64. The tool sniffs MIME from magic bytes when the prefix is missing, shows a preview, and lets you download the file.

Why is Base64 about 33% larger?

Base64 encodes every 3 binary bytes as 4 ASCII characters, so the text is roughly one third larger than the file. The size panel shows the exact overhead for your payload.

When should I not inline Base64 images?

Skip inlining for large photos or anything over ~100 KB in CSS/HTML pages - it blocks caching and bloats the document. Prefer normal image URLs for those cases; keep Base64 for tiny icons, email, or offline embeds.

Which formats are supported?

PNG, JPEG, GIF, WebP, SVG, BMP, ICO, and AVIF when the browser can read them. Soft limit is 8 MB per file, enforced locally before FileReader runs.

Developer Tools

Image to Base64 Converter

Turn a local image into Base64 (or a ready-to-paste data URL, CSS background, HTML img, or Markdown snippet) without uploading anything.

Your image never leaves your browser. Encoding uses FileReader locally - there is no upload endpoint.

Drop an image here or click to browse

PNG, JPG, GIF, WebP, SVG, BMP, ICO, AVIF (max 8 MB). Read locally - nothing is uploaded.

Or paste a screenshot with Ctrl+V / Cmd+V - the fastest path for screen grabs.

About Image to Base64 Converter

Turn a local image into Base64 (or a ready-to-paste data URL, CSS background, HTML img, or Markdown snippet) without uploading anything. This free Image to Base64 Converter reads files with FileReader in your browser, so screenshots, logos, and unreleased assets never leave your device. Go the other way: paste a data URL or raw Base64, preview the image, and download it.

How to Use Image to Base64 Converter

Choose Image → Base64. Drop a file, click to browse, or paste a screenshot with Ctrl+V / Cmd+V.
Review the preview, MIME type, pixel size, original vs Base64 size, and the exact overhead percent (~33%).
Copy the Data URL, raw Base64, CSS background-image, HTML img, or Markdown tab. Nothing is uploaded.
To reverse: switch to Base64 → Image, paste a data URL or raw Base64, preview, then download the file.

Image to Base64 Converter Examples

Inline a tiny icon in CSS

Encode a 16×16 PNG, open the CSS tab, and paste background-image: url('data:image/png;base64,...') into a stylesheet or email template.

Paste a screenshot

Copy a screen grab to the clipboard, focus this page, and press Ctrl+V / Cmd+V. The tool encodes the clipboard image immediately - no save dialog.

Decode a data URL from logs

Paste data:image/webp;base64,... into Base64 → Image to preview and download the file when you only have the string.

Check Base64 overhead

The size panel shows original bytes, encoded length, and the exact percent increase so you can decide whether inlining is worth it.

Frequently Asked Questions about Image to Base64 Converter

Does my image leave the browser?: No. Encoding uses the browser FileReader API (readAsDataURL). There is no upload endpoint. You can confirm in DevTools → Network that converting an image creates no outgoing request with the file.
How do I convert an image to Base64 online?: Drop or pick an image (or paste a screenshot), then copy the Raw Base64 or Data URL tab. Everything runs client-side.
Can I convert Base64 back to an image?: Yes. Switch to Base64 → Image, paste a data:image/...;base64,... string or raw Base64. The tool sniffs MIME from magic bytes when the prefix is missing, shows a preview, and lets you download the file.
Why is Base64 about 33% larger?: Base64 encodes every 3 binary bytes as 4 ASCII characters, so the text is roughly one third larger than the file. The size panel shows the exact overhead for your payload.
When should I not inline Base64 images?: Skip inlining for large photos or anything over ~100 KB in CSS/HTML pages - it blocks caching and bloats the document. Prefer normal image URLs for those cases; keep Base64 for tiny icons, email, or offline embeds.
Which formats are supported?: PNG, JPEG, GIF, WebP, SVG, BMP, ICO, and AVIF when the browser can read them. Soft limit is 8 MB per file, enforced locally before FileReader runs.

Base64 Encoder / Decoder

Free online Base64 encoder and decoder. Encode text to Base64 or decode Base64 back to plain text, with full Unicode (UTF-8) support - runs entirely in your browser.

Hash Generator

Generate SHA-256, SHA-1, SHA-384, and SHA-512 hashes from any text. Get the lowercase hex digest instantly in your browser - nothing is uploaded.

CSS Minifier

Free online CSS minifier. Compress and minify CSS by removing comments and collapsing whitespace - smaller stylesheets, faster page loads. Runs in your browser, no upload required.