URL-Safe Base64 Encoder | Free Online Tool

Encode text to URL-safe Base64 format for use in URLs, tokens, and web applications. 100% free, client-side processing with no ads, no tracking, and no cookies.

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Encoding Format

URL-safe replaces + with - and / with _ for safe URL transmission

Input

Output

Examples

Simple text with URL-safe encoding (no + or /)

Input:

Hello World!

Output:

SGVsbG8gV29ybGQh

URL data encoded for safe transmission

Input:

data?key=value&other=123

Output:

ZGF0YT9rZXk9dmFsdWUmb3RoZXI9MTIz

When to Use This

Creating URL-safe tokens and identifiers
Passing binary data in URL query parameters
Generating web-safe auth tokens
Encoding data for URL path segments

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How It Works

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. The Base64 alphabet uses 64 characters: A-Z, a-z, 0-9, +, and / (with = for padding). This encoding is essential for transmitting binary data over text-based protocols like HTTP, JSON, and XML.

When you encode data, binary bytes are converted to a sequence of Base64 characters, increasing the size by approximately 33%.

The URL-safe variant replaces + with - and / with _, making the output safe for use in URLs, filenames, and web tokens like JWT.

Frequently Asked Questions

What is URL-safe Base64?

Standard Base64 uses + and / characters, which have special meanings in URLs. URL-safe Base64 replaces + with - and / with _, making the output safe for use in URLs, filenames, and web tokens.

When should I use URL-safe Base64?

Use URL-safe Base64 when your encoded data will be placed in URLs, JWT tokens, API parameters, or any context where + and / would cause issues.

Should I remove padding (=)?

In URLs, padding (=) characters can sometimes cause issues. Many URL-safe implementations remove padding or replace it. This tool supports both padded and unpadded output.

Is this the same as Base64URL?

Yes. Base64URL is another name for URL-safe Base64. It is commonly used in JWT (JSON Web Tokens) and other web standards.

Is my encoded data private?

Yes. All encoding happens locally in your browser. Your text never leaves your device. Zero cookies, zero tracking, zero ads.

Your Privacy is Protected

All Base64 encoding and decoding happens entirely in your browser. Your text and files never leave your device, are never sent to any server, and are never stored. We use zero cookies, zero tracking, and zero ads.