Does my text get sent to a server?

No. All Base64 and URL encoding or decoding happens entirely in your browser using native JavaScript. Your text never leaves your device and is never uploaded or stored anywhere.

Does Base64 encoding support Unicode and emoji?

Yes. This tool is fully UTF-8 safe. It correctly encodes and decodes non-ASCII characters, accented letters, and emoji by handling the UTF-8 byte sequence before applying Base64.

What is the difference between URL encode and encodeURI?

Standard URL encode (encodeURIComponent) escapes every reserved character, making it ideal for encoding a single query parameter value. The 'Encode full URL' option (encodeURI) preserves characters like :/?# so a complete URL stays valid and clickable.

Why do I get an 'Invalid Base64 input' error?

That error appears when the input is not valid Base64, such as containing spaces, line breaks, or characters outside the Base64 alphabet. Make sure you are decoding a properly encoded Base64 string, or switch the mode to encode first.

Base64 / URL Encoder

Encode and decode Base64 and URL text instantly and securely, right in your browser.

Base64 Converter

Input0 bytes

Output

How to Use

Convert Base64 and URL text in seconds.

Choose a Mode

Switch between Base64 and URL depending on the kind of conversion you need.

Encode or Decode

Paste your text into the input, then press Encode or Decode to transform it instantly.

Copy the Result

Copy the output to your clipboard, or use Swap to feed it back for a reverse conversion.

Encoding Tips

Get the most out of Base64 and URL conversions.

Base64 Is Not Encryption

Base64 only encodes data into an ASCII-safe format. It is easily reversible, so never use it to protect passwords or secrets.

UTF-8 Safe by Design

This tool handles emoji and accented characters correctly by converting to UTF-8 bytes before Base64, avoiding the classic btoa() error.

Component vs Full URL

Use standard URL encode for a single query value, and 'Encode full URL' when you need a complete, valid link that keeps its slashes and colons.

Use Swap to Verify

After encoding, hit Swap and Decode to confirm you get the original text back — a quick round-trip sanity check.

All conversion runs locally in your browser. No data leaves your device.