Base64/URL 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.

When a URL's query parameters contain non-ASCII characters, spaces, or special characters, they need to be converted to a form like %20 so browsers and servers interpret them correctly.

This happens when the input isn't a valid Base64 string, or when a % in URL-encoded input isn't followed by valid hex digits. Double-check the original value.

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.