How it works

Convert text to Base64 or Base64 back to text, with UTF-8 handling so emoji and non-ASCII characters round-trip cleanly.

Type or paste into the input box and the encoded / decoded result appears live. Mode toggles between encode (text to Base64) and decode (Base64 to text). The implementation wraps btoa / atob in encodeURIComponent / decodeURIComponent so multi-byte UTF-8 sequences (accents, emoji, CJK) survive the round-trip; a naive btoa on a UTF-8 string fails on non-ASCII input. Bad Base64 input shows an inline error. The copy button puts the output on your clipboard. Use cases: stuffing JSON into a URL parameter, decoding a data: URI, inspecting basic-auth headers, embedding a small image in CSS. For Base64 of files (images, binaries), look for tools that handle binary data directly.

How to use it

1. Pick encode or decode. Toggle between text-to-Base64 and Base64-to-text.
2. Paste your input. The result appears live as you type; bad Base64 shows an inline error.
3. Copy the output. One click puts the result on your clipboard — nothing ever touches a server.

Frequently asked questions

Why does my decoded Base64 have garbled characters?

Usually a UTF-8 issue. This tool handles UTF-8 input cleanly; if you're getting garbled text, the original Base64 may not have been encoded as UTF-8.

Can I encode a file to Base64?

Not directly. This tool is for text. For images and binaries, look for a data: URI tool or use the developer console (btoa on a binary string).

Is the data uploaded?

No. Encoding and decoding happen entirely in your browser, no network involved.

Is the output URL-safe?

It's standard Base64 (with + and /). For URL-safe Base64 (- and _), you'd need to substitute manually.