Base64 Encoder & Decoder

No. All encoding and decoding happen entirely in your browser and are never sent to or stored on a server.

It's used when binary data like images or files needs to be represented as text, for example in API responses, email attachments, or data URIs. It's a representation change, not encryption, so it isn't meant for security purposes.

This happens when the input isn't a valid Base64 string. Check for stray spaces or line breaks, or a value that got cut off partway through.

Yes. Text is first encoded as UTF-8 and then converted to Base64, so any Unicode character — including non-Latin scripts and emoji — is supported.

This tool is text-only. To convert an image file to Base64, use the Base64 image converter, which supports uploading a file directly.