Image to Base64
Convert any image to a Base64 data URL with ready-to-paste CSS and HTML snippets — encoded locally.
About this tool
Base64 encoding turns an image file into a block of text, which lets the image live inside code — embedded directly in a stylesheet, an HTML file, a JSON payload or an email template, with no separate file to host and no extra network request to load it. It's a standard technique for small assets: icons, logos, tiny backgrounds, email signature images.
Drop in an image and get the result in the four formats developers actually paste: the complete data URL (data:image/png;base64,…), the raw Base64 string alone (for JSON or APIs that add their own prefix), a ready CSS background-image rule, and a complete HTML img tag. One click copies whichever you need.
The tool is also honest about the trade-off, because Base64 has one: encoded data is ~33% larger than the original file, and embedded images can't be cached separately by the browser. The size readout shows your exact before/after numbers, and a warning appears for files over 1 MB — where embedding almost always hurts page performance and a normal hosted file is the right call. Encoding happens entirely in your browser via the FileReader API; the image never leaves your device.
How to use the Image to Base64
- 1Choose an image — it's encoded instantly in the browser.
- 2Pick the output: full data URL, raw Base64, CSS rule, or HTML tag.
- 3Check the size readout — Base64 adds ~33% to the file size.
- 4Copy and paste into your code.
Frequently asked questions
When should I use Base64 images vs normal files?
Base64 fits small, frequently-used assets: icons, logos under ~10–20 KB, email signature images. Normal hosted files win for anything larger, because Base64 adds ~33% size, can't be cached independently, and bloats your HTML/CSS. The tool warns you past 1 MB for exactly this reason.
Why is the Base64 version bigger than my file?
Base64 represents every 3 bytes of binary as 4 text characters — a built-in +33% overhead, unavoidable by design. The size readout shows your exact numbers. If size matters, compress the image first (the Image Compressor here) and then encode.
What's the difference between the data URL and raw Base64?
The data URL includes the prefix (data:image/png;base64,) that browsers need to render it directly in src or CSS. The raw string is just the encoded data — used when an API, framework or email system supplies its own wrapper.
Do Base64 images work in emails?
In many clients yes — it's a common technique for signature logos — but support varies: some webmail clients (notably Gmail in certain contexts) block or strip embedded images. For critical email imagery, hosted images with absolute URLs remain the safer choice.
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