URL Safe Base64 Converter

Convert between Base64 and URL-safe Base64. Encode text to Base64URL, decode Base64URL to text, add or remove padding, and validate web-safe tokens.

Input

Paste text, standard Base64, Base64URL, or a JWT segment.

Conversion Settings

Action

Padding

Text Encoding

Output Format

Base64URL changes

+ becomes -

/ becomes _

= padding is often removed

Options

Trim input before convertingPretty-print decoded JSON when possibleWarn about invalid Base64URL charactersWarn about missing or unusual paddingWarn when input looks like JWT partsWarn when decoded output may be binary

Base64URL conversion runs locally in your browser. Avoid pasting live secrets or production tokens unless needed.

Output

Converted Base64URL output will appear here.

This tool converts pasted text locally in your browser. It does not verify JWT signatures, validate tokens, or contact any API.

Converting Base64 to URL-Safe Base64

Standard Base64 can contain characters such as plus, slash, and equals signs. Those characters can be awkward in URLs, filenames, tokens, and query strings. Base64URL replaces those characters with URL-safe alternatives.

This URL Safe Base64 Converter helps convert standard Base64, Base64URL, readable text, and JWT-style payload segments without sending data away from your browser.

Using the URL Safe Base64 Converter

Paste text, standard Base64, Base64URL, or a token segment.
Choose the conversion action.
Choose whether padding should be preserved, removed, or added.
Review URL safety, padding, and token-style warnings.
Copy the converted output for debugging, APIs, JWTs, or URL-safe storage.

Base64URL Differences

+ becomes -.
/ becomes _.
= padding is often removed.
Base64URL is commonly used in JWTs and web-safe token formats.
Base64URL is encoding, not encryption.

Example Conversion

Text: {"sub":"user_123"}
Base64: eyJzdWIiOiJ1c2VyXzEyMyJ9
Base64URL: eyJzdWIiOiJ1c2VyXzEyMyJ9

Base64URL Is Not Token Verification

Decoding a JWT header or payload only makes the encoded text readable. It does not prove the token is valid, trusted, current, or correctly signed.

Use this tool for encoding and decoding convenience, then use proper JWT verification, API validation, or security tooling where trust matters.

Frequently Asked Questions

What is Base64URL?

Base64URL is a URL-safe version of Base64 that replaces plus and slash characters and often removes equals padding.

Can this decode JWT payloads?

It can decode JWT-style Base64URL segments, but it does not verify token signatures or claims.

Should Base64URL include padding?

Many web token formats omit padding. Some systems expect padding, so this tool can add, remove, or preserve it.