File to Base64

Convert any file to Base64 encoding

Click or drop any file here

About File to Base64

File to Base64 is a free online tool that instantly converts any file into a Base64-encoded data URL, right in your browser. Upload a file and get a ready-to-use Base64 string for embedding in HTML, CSS, JSON, or API payloads — nothing is ever uploaded to a server.

How to use File to Base64

1Click the upload area and select any file from your device.
2The file is encoded to Base64 automatically the moment it's selected — no extra button to click.
3Review the encoded string in the output box.
4Click "Copy Base64" to copy the result to your clipboard.

Frequently Asked Questions

Is File to Base64 free to use?

Yes, it's completely free with no signup and no limit on how many files you can encode.

Is my file uploaded anywhere?

No. The file is read and encoded locally using the browser's FileReader API — it never leaves your device.

What kinds of files can I encode?

Any file type — images, PDFs, documents, and more — one file at a time.

What does the output look like?

A full data URL (data:<mime-type>;base64,<data>) ready to paste into an src attribute, JSON payload, or API call.

Tips & Tricks

✓Use the Base64 output directly as an image or CSS background src to avoid an extra HTTP request for small assets.
✓Very large files produce very large Base64 strings and can slow down the browser tab — this works best for small to medium files.
✓Base64 is an encoding, not encryption — don't use it to hide or protect sensitive data.
✓If you only need the raw Base64 payload, strip the "data:mime/type;base64," prefix from the output.