Base64 decode

Decode Base64 to text

A Base64 decoder converts encoded characters back into their original bytes, then reads those bytes as text. It is useful when an API response, environment variable, email attachment, or data URL contains a Base64 value instead of readable text.

How to decode a Base64 string

1. Open the Base64 tool and keep Decode selected.
2. Paste the encoded value into the left side.
3. The decoded result appears on the right and is copied to your clipboard.

Common decoding issues

Valid Base64 uses letters, numbers, plus signs, slashes, and optional equals signs for padding. This tool also accepts URL-safe Base64, which replaces plus and slash with hyphen and underscore. A decoding error usually means the source is incomplete or was not encoded as UTF-8 text.