DevConvertor

Base64 Decoder

Decode Base64 to readable text with proper UTF-8 handling. Malformed Base64, or Base64 that doesn't decode to valid text, is reported clearly instead of silently producing garbage.

ReadyEncoding & Decoding ToolsFree · No account required

Related tools

Base64 EncoderEncode text to Base64, with full Unicode support.URL DecoderDecode a percent-encoded URL or query string.

Features

  • Proper UTF-8 handling on the way back to text
  • Detects invalid Base64 and non-UTF-8 output instead of silently corrupting it
  • Copy or download the decoded text

How to use

  1. Paste a Base64 string into the input box.
  2. The decoded text appears automatically, or an error explains what's wrong.
  3. Copy or download the result.

Example

Example

SGVsbG8sIHdvcmxkIQ== → "Hello, world!"

FAQ

What happens if the Base64 is invalid?
You'll get a clear error instead of garbled output — either that the text isn't valid Base64, or that it decodes to bytes that aren't valid UTF-8 text.
Can this decode a JWT?
A JWT's header and payload are Base64URL-encoded, which uses - and _ instead of + and /. Use the JWT Decoder for tokens — this tool is for standard Base64.