Does it handle emoji and non-English text?

Yes. Text is converted as UTF-8 before encoding, so accents, emoji and any script round-trip correctly. (The browser's plain btoa() function fails on these.)

What is URL-safe Base64?

A variant that uses - and _ instead of + and /, so the result can sit in a URL or file name without escaping. Switch it on when encoding; when decoding, both kinds are accepted automatically. You can also remove the trailing = padding.

Is Base64 a form of encryption?

No. It is just a way of writing bytes as text, and anyone can reverse it instantly. Never use it to hide a password or secret.

Why is the Base64 version bigger?

It writes every 3 bytes as 4 characters, so the output is about a third larger than the original.

A way to embed a whole file inside a web page or stylesheet as text, like data:image/png;base64,…. When you encode a file, turn on 'Output as a data: URI' to get it ready to paste. Decoding also accepts a data: URI.

Utility

Base64 Encode & Decode

Convert text or files to Base64 and back. Handles Unicode, URL-safe Base64 and data: URIs — all in your browser, nothing uploaded.

Text to encode

Options

URL-safeUses - and _ instead of + and /.Remove paddingDrops the trailing = signs.76-column linesMIME-style line breaks.

Or encode a file

Output as a data: URIAdds the data:…;base64, prefix so it can be used directly in HTML or CSS.

How it works

1
Choose Encode or Decode.
2
Type or paste your text — or, to encode a file, choose it (up to 10 MB).
3
Copy the result. If a Base64 string decodes to a file rather than text, you can download it.

Base64 Encode & Decode — frequently asked questions

Does it handle emoji and non-English text?: Yes. Text is converted as UTF-8 before encoding, so accents, emoji and any script round-trip correctly. (The browser's plain btoa() function fails on these.)
What is URL-safe Base64?: A variant that uses - and _ instead of + and /, so the result can sit in a URL or file name without escaping. Switch it on when encoding; when decoding, both kinds are accepted automatically. You can also remove the trailing = padding.
Is Base64 a form of encryption?: No. It is just a way of writing bytes as text, and anyone can reverse it instantly. Never use it to hide a password or secret.
Why is the Base64 version bigger?: It writes every 3 bytes as 4 characters, so the output is about a third larger than the original.
What is a data: URI?: A way to embed a whole file inside a web page or stylesheet as text, like data:image/png;base64,…. When you encode a file, turn on 'Output as a data: URI' to get it ready to paste. Decoding also accepts a data: URI.