# Base64 Encoder

> Encode and decode Base64 (and UTF-8 text) instantly in the browser. Convert strings for Data URIs, HTTP headers, and binary-safe transport. Nothing is uploaded, so you can encode without pasting secrets into a public encoder.

Runs in your browser. Nothing is uploaded.

[Encode](https://toolbuddy.dev/categories/encode.md)

## About this tool

Encode and decode Base64 with UTF-8 text, including the URL-safe alphabet (- and _). Decoding accepts standard or URL-safe input and restores padding when needed, so a truncated Data URI payload still has a chance to round-trip.

How to use: paste text, pick encode or decode, optionally URL-safe. Copy the result. Large pastes are chunked so btoa does not blow the stack. Invalid Base64 shows an error instead of garbage characters.

Example: 'hi' encodes to aGkg (with padding depending on mode). Use it for Data URIs, HTTP basic-auth experiments, and binary-safe transport of short strings. It is not encryption.

Encoding is local. Do not paste production secrets into a hosted encoder when this tab will do. After the first load you can keep converting offline. Swap after decode if you want to re-encode a round-trip check. Related: URL encoder for percent-encoding, hash generator if you needed a digest rather than a transport encoding. If you need to convert an image before encoding a Data URI, try [Online Image Converter](https://onlineimageconverter.net/).

## Related Encode tools

- [Base32 Encoder](https://toolbuddy.dev/tools/base32-encoder.md): Encode and decode RFC 4648 Base32 in the browser. Handy for OTP secrets, human-typed tokens, and case-insensitive transport. Codec runs locally with no upload.
- [ROT13](https://toolbuddy.dev/tools/rot13.md): Apply ROT13 to text in either direction (the cipher is its own inverse). A classic Caesar shift for puzzles and lightly obfuscated spoilers, not encryption. Runs entirely in the tab.