What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _ to make the output safe for use in URLs without percent-encoding.

This tool encodes text. For file encoding, use the Image to Base64 tool.

Why does Base64 output end with ==?

The = characters are padding to make the Base64 string length a multiple of 4.

What is the overhead of Base64?

Base64 increases data size by approximately 33%.

Base64 Encode / Decode — Encode text to Base64 or decode Base64 strings instantly in your browser.

How to use Base64 Encode / Decode

Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.

Paste or type your input in the INPUT panel
The output regenerates automatically as you type
Use Copy to put the result in your clipboard
Click Sample to load a working example

What is Base64 Encode / Decode?

Base64 is an encoding scheme that converts binary data to ASCII text. This tool lets you encode any text to Base64 or decode a Base64 string back to readable text. Supports standard Base64 and URL-safe Base64 variants. All processing is done locally — your data never leaves your browser. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.

Common use cases

Debugging API payloads and integration issues
Inspecting tokens, hashes, or encoded strings during development
Generating fixtures and sample data for tests
Sharing readable output with teammates in code reviews

FAQ

No. Base64 is encoding, not encryption. Anyone can decode a Base64 string. Do not use it to secure sensitive data.