What character encoding does this use?

The tool uses UTF-8 encoding by default, which supports all Unicode characters including emojis and international scripts.

Is there a size limit?

There is no hard limit. The tool processes data in your browser memory, so it can handle inputs of several megabytes depending on your device.

Base64 Encoder in Your Browser

Need to quickly encode a string to Base64 without opening a terminal? This browser-based tool handles encoding and decoding instantly with zero server communication, keeping your data completely private.

Open Base64 Encoder

Steps to Encode Base64

Type or paste your text into the input field
Select Encode or Decode mode
The result appears instantly in the output area
Click Copy to clipboard or download as a file

Common Use Cases

Generating Authorization headers for REST API testing
Decoding Base64 strings found in configuration files
Converting SVG files to Base64 data URIs
Inspecting encoded email attachments

Frequently Asked Questions

What character encoding does this use?: The tool uses UTF-8 encoding by default, which supports all Unicode characters including emojis and international scripts.
Is there a size limit?: There is no hard limit. The tool processes data in your browser memory, so it can handle inputs of several megabytes depending on your device.