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Base64 Encode & Decode

Convert text to Base64 and back, turn a file into a data URI, or save a Base64 string as a file.

Runs in your browser — nothing is uploaded.

Use - and _, no padding.

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File to Base64

Reading…

Loaded: ·

Add the data:…;base64, prefix.

Copied

Base64 to file

Paste Base64 text or a data:…;base64, URI.

How to use it

  1. Pick Encode or Decode and type or paste your text. The result updates as you type.
  2. For URLs, JWTs and filenames tick “URL-safe”: it uses - and _ and drops the = padding.
  3. To work with a file, open the File tab: drop a file to get its Base64 or data URI, or paste Base64 and download the file.

Frequently asked questions

Is my data uploaded?

No. Everything runs in your browser; text and files never leave your device.

Does it handle emoji and accents?

Yes. Text is converted to UTF-8 first, so any character round-trips correctly.

What is URL-safe Base64?

A variant that uses - and _ instead of + and /, and usually omits the = padding, so it can sit in a URL or filename unescaped.

Is there a file size limit?

Files up to 20 MB. Base64 is about a third larger than the original data.

Is Base64 encryption?

No. Anyone can decode it. Do not use it to protect secrets.

Related tools

URL Encode & Decode Percent-encode and decode URLs and query strings online: encodeURIComponent, encodeURI and form encoding (+ for spaces). Private, in your browser. Hex, Binary & Decimal Converter Convert text to hex, binary or decimal bytes and back, with a UTF-8 byte view and hex dump. Handles emoji and accents. Private, in your browser. JWT Decoder & Verifier Decode a JSON Web Token and verify its HS, RS, PS or ES signature in your browser. Shows exp, iat and nbf as dates. The token never leaves your device.