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Base64URL Converter

Encode and decode URL-safe Base64 (Base64URL). Convert between standard Base64 and Base64URL for JWTs, query strings, and filenames.

PrivateIn your browserInstantUnlimited

22 characters

30 characters · 22 bytes

How it works

1

Choose a mode

Encode turns UTF-8 text into Base64URL. Decode reverses it. Std → URL swaps +/ for -_ (and usually drops =). URL → Std restores standard Base64.

2

Padding and live convert

JWTs typically omit padding. Enable Keep padding if a consumer expects = characters. Live mode updates as you type.

3

Copy or download

Swap flips related modes and moves output to input. Copy or download the result — nothing is uploaded.

What is a Base64URL converter?

Base64URL is the URL-safe variant of Base64 used in JWTs, signed cookies, and query parameters. This tool encodes and decodes UTF-8 text as Base64URL and converts between standard and URL-safe alphabets in your browser.

Why use this tool

  • UTF-8 ↔ Base64URL
  • Standard Base64 ↔ Base64URL
  • Optional padding retention
  • Live mode and swap
  • Byte stats
  • Unlimited use — no daily cap

Questions

What is Base64URL?

A URL- and filename-safe Base64 alphabet (RFC 4648 §5) that uses - and _ instead of + and /, often without = padding. JWTs use it for each segment.

When should I keep padding?

Most JWT and query-string uses omit =. Keep padding only if the other side expects a length that is a multiple of 4 with = characters.

How is this different from the Base64 tool?

The Base64 tool focuses on text ↔ Base64 with an optional URL-safe checkbox. This page also converts existing Base64 strings between standard and URL-safe forms.

Is my text sent to a server?

No. Conversion runs entirely in this tab.

Is there a daily limit?

No. This tool has no daily cap.

Do I need an account?

No. Open the page and use it.

Does it work on a phone?

Yes. It runs in the mobile browser.

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