FreeDev Tools

Base64URL Encoder

Encode and decode URL-safe Base64 (base64url) — the JWT variant with - and _ instead of + and /.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Paste text or a token segment

    Pick encode or decode.

  2. 2

    Convert

    Decoding accepts padded or unpadded input.

  3. 3

    Copy the result

    Safe to embed in URLs, cookies, and filenames.

Frequently Asked Questions

Two characters are swapped (+ becomes -, / becomes _) and the trailing = padding is usually dropped — making the output safe in URLs, filenames, and cookies without escaping.

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