DevFmt/

Base64 Decode

Input — Base64
Output — Text

How to use Base64 Decode

Base64 Decoder converts Base64-encoded strings back to readable text. Supports both standard and URL-safe Base64 formats with automatic detection.

Paste a Base64 string and see the decoded output instantly. The decoder handles URL-safe variants automatically — it detects the use of - and _ characters and normalizes padding before decoding.

Key features: automatic URL-safe detection, UTF-8 output support, error reporting for invalid input, one-click copy, and download.

All decoding happens locally in your browser. No data is ever sent to a server.

FAQ

How do I decode Base64?
Paste a Base64 string into the input panel. The decoded text output appears instantly. The tool auto-detects URL-safe Base64 encoding.
Does it handle URL-safe Base64?
Yes. The decoder automatically detects and handles URL-safe Base64 (with - and _ characters) and adds missing padding as needed.
What if my Base64 string is invalid?
The status bar shows an error message. Common issues include extra whitespace, line breaks, or non-Base64 characters in the input.

Related tools

/base64/encode

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