Encode any image as a Base64 data URI, with ready-to-copy HTML and CSS snippets — right in your browser, with nothing uploaded.
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Quick answer
An image to Base64 encoder turns a picture into a long text string called a data URI, which you can paste directly into HTML or CSS instead of linking to a separate file. Drop an image above and this tool gives you the full data URI plus ready-made <img> and CSS background snippets, and shows the encoded size. It is free, needs no sign-up, and everything runs in your browser, so your image stays private.
Base64 is a way of representing binary data — like the bytes of an image — using only 64 plain text characters (A–Z, a–z, 0–9, plus a couple of symbols). Because the result is ordinary text, it can travel anywhere text can go: inside an HTML file, a stylesheet, a JSON payload or an email. A data URI wraps that text with a small header (for example data:image/png;base64,) that tells the browser what kind of file it is, so it can decode and display the image without ever downloading a separate file.
Embedding an image as Base64 shines for small assets: icons, a logo, a tiny background texture, or graphics in an HTML email where external images are often blocked. It bundles everything into a single file and removes an extra network request, which can shave a few milliseconds off the first paint. It's also perfect for quick demos, prototypes and self-contained snippets you want to share without shipping image files alongside them.
For large or frequently reused images, a normal file URL is almost always better. Base64 adds about 33% to the size, and an inlined image can't be cached on its own — the browser has to re-download the whole string every time the HTML or CSS changes, and it can't be reused across pages. A giant data URI also makes your markup hard to read. As a rough rule, inline images under a few kilobytes and link to anything bigger.
Once you've encoded an image, copy the data URI on its own to drop into JavaScript or a framework, or grab the ready-made HTML <img> tag to paste straight into a page. The CSS backgroundsnippet is ideal for decorative images — paste it into a rule to set a background without a separate file. Everything is generated locally, so you can encode sensitive or unpublished images with confidence.
No. This encoder reads your image directly on your device using the browser's FileReader API. The image is never uploaded, stored or seen by anyone — the Base64 string is generated entirely in your browser.
It's a way of writing an image as plain text. The data URI starts with data:image/… followed by a long Base64-encoded string of the file's bytes. Because it's just text, you can paste it straight into HTML or CSS and the browser rebuilds the image — no separate file needed.
It's handy for small assets like icons, logos or background patterns, for single-file HTML emails or documents, and to avoid an extra network request. For large images it's usually a poor trade-off, because embedding bloats your file and the browser can't cache the image separately.
Base64 represents binary data using only text characters, which adds roughly 33% overhead. So a 90 KB image becomes about 120 KB of text. That's normal — the tool shows you the exact encoded size so you can decide whether inlining is worth it.
Paste the full data:image URI into your browser's address bar and press Enter to view it, then right-click and choose Save image to write it back to a file. Any Base64 decoder will also convert it back to the original bytes.