File to Base64 Converter
Convert any file to a Base64 string right in your browser — get the raw Base64 or a ready-to-embed data URL for HTML, CSS or JSON.
Input
Drop a file or browse
One file · any type
The file is read locally — it is never uploaded.
Output
Base64 string
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More ways to use this tool
Embed widget
<iframe
src="https://iotools.cloud/embed/file-to-base64-encode/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="File to Base64 Converter — iotools.cloud"
sandbox="allow-scripts allow-forms allow-same-origin allow-downloads allow-popups allow-popups-to-escape-sandbox"
allow="clipboard-write"
style="width:100%;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden"></iframe>
<script src="https://iotools.cloud/embed.js" async></script>Drop this into your own page — free, no key required, just a link back.
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What does this converter do?
Drop in any file — an image, font, PDF, certificate — and get its contents as a Base64 string. Choose between the raw Base64 payload or a complete data URL (data:image/png;base64,…) you can paste straight into HTML src attributes, CSS url() values or JSON fields.
Common uses
- Inlining small images or icons into HTML/CSS to avoid extra requests.
- Embedding fonts or certificates in configuration files.
- Preparing binary payloads for JSON APIs that only accept text.
How to use it
- Drop a file onto the uploader (or click to browse).
- Pick Base64 only or Data URL.
- Copy the result or download it as a text file.
Keep in mind Base64 output is ~33% larger than the original file — inlining is best for small assets.
Privacy
The file is read with your browser's FileReader and converted locally. It is never uploaded to any server.
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