Encode and decode Base64 in the browser, with UTF-8 support, Base64URL, and privacy notices.
The converter transforms text into Base64 or Base64URL and decodes Base64 back to UTF-8 text. It validates characters, padding, length, and UTF-8 bytes before showing output.
Paste content, choose encode or decode, select Base64 or Base64URL, and copy the output. Shared links preserve only settings by default; include content in the link only when it can be public to whoever receives the URL.
Conversion happens in your browser. This tool does not send the content to the server.
Choose the operation, alphabet, and how to handle padding or copied line breaks.
By default, the link stores only operation, alphabet, and options.
The current link does not include pasted text.
When encoding, text becomes UTF-8 bytes before Base64 is applied. Accents, symbols, and emoji work without direct btoa use.
Base64URL uses - and _ instead of + and /, a common format for URLs, tokens, and parameters.
Base64 is reversible. Do not use it as protection for passwords, tokens, or private data.
No. Base64 is only reversible encoding. Anyone with the encoded text can decode the content.
No. Conversion happens in the browser. Content only enters the link when you enable the include input option.
Base64URL replaces the + and / symbols with - and _, which avoids problems in URLs and some tokens.
Because Base64 can represent binary bytes. This version decodes only bytes that form valid UTF-8 text.
It depends on the system. Traditional Base64 often uses padding, while URL-safe strings often omit the = sign.
Yes, but only after enabling the option to include input in the link. Do not use that with secrets, tokens, credentials, or personal data.