Developer Tools

URL-safe Base64 Decoder

Decode URL-safe Base64 strings back into readable text.

Tool

Use this URL-safe Base64 decoder to decode Base64URL input by handling dash and underscore characters, missing padding, and UTF-8 text output. It is useful for tokens, URLs, payloads, and debugging encoded values used in web apps and APIs.

Input

Output

About this tool

Use this URL-safe Base64 decoder to decode Base64URL input by handling dash and underscore characters, missing padding, and UTF-8 text output. It is useful for tokens, URLs, payloads, and debugging encoded values used in web apps and APIs.

Use url-safe base64 decoder when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.

Learn more

URL-safe Base64 Decoder Guide

Read step-by-step usage guidance, best practices, and common mistakes.

URL-safe Base64 Decoder FAQ

See common questions and answers about input, output, and tool usage.

URL-safe Base64 Decoder Examples

Review practical input and output examples before running the tool.

Related Tools

Find similar and supporting tools for adjacent actions and follow-up tasks.

Why use this tool

Decodes Base64URL text into readable output quickly.
Useful for tokens, URLs, payloads, and auth debugging.
Helps handle missing padding and URL-safe characters automatically.
Good for one-off checks without writing a decoding script.
Runs directly in the browser with readable output.

How to use

Paste the URL-safe Base64 string into the input box.
Run the tool to decode it.
Review the readable output.
Copy the result if needed for debugging, notes, or reuse.

Examples

Example

Input

SGVsbG8

Output

Hello

Decodes a valid URL-safe Base64 string back into readable text.

Common errors

The input is not valid Base64URL or belongs to another encoding family.

Fix: Check that the source is really URL-safe Base64 before decoding it.

Extra spaces or line breaks change the result.

Fix: Trim the input and remove accidental whitespace before running the tool.

The user expects encoding rather than decoding.

Fix: Use the matching encode page when the source input is plain text.

FAQ

What does URL-safe Base64 Decoder handle?

It handles Base64URL input with - and _ characters and automatically restores missing padding when needed.

What is this useful for?

It is useful for decoding tokens, URL parameters, payload fragments, and Base64URL-encoded text.

Why does decoding fail?

Decoding usually fails when the pasted value is incomplete, has invalid characters, or belongs to a different encoding format.

Is this URL-safe Base64 decoder free to use?

Yes. It works online in the browser.

When should I use URL-safe Base64 Decoder instead of Base64 URL Decoder?

They target the same general need. Use whichever page matches the wording or search intent you prefer.

Use cases

Reading payload fragments from tokens and URLs.
Debugging copied Base64URL values from APIs or logs.
Checking whether encoded token data was copied correctly.