Sometimes a file has to live inside a string, a JSON payload, an email, or a config, and base64 is how binary becomes text. The cost is real, encoding adds about 33 percent to the size, which sets the rule: small files, not libraries.
Encode any dropped file as base64 with a MIME data URI, in the browser. Use it for tiny images in fixtures, small attachments in API tests, and the config that needs a binary embedded.
Try it now: open the free tool, runs 100{ddff9936f8333f09603555df7bd6492034f3a4a35de784276d3cf3d66166a113} in your browser.
Bottom line: small files only, base64 grows the payload by a third.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use File to Base64?
Open the File to Base64 in your browser (Any small file to Base64). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste or type the value you want converted into the input box.
- Pick the units or format you are converting between.
- Read the converted result and copy it with the copy button.
Try File to Base64 free. It opens right in your browser.