About this tool
Embedding a small icon or logo directly into CSS or HTML saves a request and makes single-file demos and email templates self-contained. Image to Base64 does the encoding locally: drop in a PNG, JPEG, GIF, WebP or SVG and get the data URI instantly, with no upload and no size limit beyond your own machine. The tool shows the original file size next to the encoded size so the roughly thirty-three percent overhead of base64 is never a surprise, and it warns you when the result is large enough that a separate file would be the better engineering choice. Output comes in four ready-to-paste formats: the raw data URI, a CSS background-image rule, a complete HTML img tag, or a JSON snippet for design tokens and configuration files. One click copies whichever you need. Because the conversion happens with FileReader in your browser, it is safe for unreleased brand assets, client logos and screenshots that should not pass through a third-party converter. For anything bigger than a few dozen kilobytes, consider whether inlining is really worth it — the tool will tell you — but for icons, placeholders and tiny illustrations this is the fastest path from file to paste.
How to use Image to Base64
- Drop an image onto the tool or click to browse.
- Check the size comparison: original bytes versus the base64-encoded length.
- Pick an output format: raw data URI, CSS rule, HTML img tag or JSON.
- Press Copy and paste the result into your stylesheet, markup or config.
Frequently asked questions
Is my image uploaded?
No. The file is read with the browser's FileReader API and encoded locally. Nothing is transmitted, which makes it safe for confidential artwork.
Why is the base64 output bigger than the file?
Base64 stores three bytes in four characters, so encoded size is about 133% of the original plus the data URI header. The tool shows both numbers so you can judge the trade-off.
When should I not inline an image?
Above roughly 10–20 KB a separate cached file usually wins: base64 blocks CSS parsing, cannot be cached independently and inflates every page that contains it.
Which formats are supported?
Any image your browser can read — PNG, JPEG, GIF, WebP, AVIF and SVG — with the correct MIME type in the data URI.