Base64 Decoder
Decode Base64 strings back to readable text. Free online Base64 decoder with instant results in your browser.
Everything runs in your browser. Your input is not sent to a server.
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How to use the Base64 Decoder
- Paste the Base64 string.
- Press Decode.
- Read or copy the decoded text.
- Fix padding or character errors if decoding fails.
How it works
The decoder reverses Base64 into the original bytes and interprets them as text using the tool’s character encoding rules (typically UTF-8).
Invalid characters or bad padding produce an error instead of silent corruption.
Examples
- SGk= → “Hi”
- Malformed strings without proper padding may fail until corrected.
- Decoded output matches what was originally encoded if the string is valid.
Base64 Decoder FAQ
Why did decoding fail?
Check for missing padding (=), spaces, or characters outside the Base64 alphabet.
Is decoding done on a server?
No. It runs in your browser.
Is the Base64 Decoder free?
Yes.
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