Free Base64 Decoder
Staring at a wall of Base64 and wondering what it says? The Base64 Decoder reverses it instantly — paste the string and read the original text. It tolerates whitespace, accepts URL-safe variants, validates input with clear errors, and decodes Unicode correctly, so international text comes back intact.
Whitespace is ignored; URL-safe Base64 (- and _) is accepted.
How to Use the Base64 Decoder
- Paste your Base64 string into the input box.
- The decoded text appears live below.
- Invalid input shows a clear error message.
- Copy or download the decoded text.
Features
Live decoding; standard + URL-safe support; whitespace-tolerant; strict UTF-8 validation with clear errors; copy and download.
Benefits & Use Cases
Inspect JWT payloads, debug API responses, read encoded email content, or recover text from data URLs.
Tips
If decoding fails, check for truncated input — a common cause is copy-pasting that cut off the end. Remember that decoding reveals content but proves nothing about who created it.
Frequently Asked Questions
Why did I get an "Invalid Base64" error?
The input contains characters outside the Base64 alphabet or has bad padding. Common culprits: truncated pastes, or text that was never Base64 to begin with.
Can it decode URL-safe Base64?
Yes. The - and _ characters are automatically converted, and missing padding is restored before decoding.
The output looks like gibberish — why?
The Base64 was probably encoding binary data (like an image) rather than text. This tool decodes to UTF-8 text; binary output will not be readable.
Is decoding safe?
Decoding itself is harmless — it is just a format conversion. But do not execute or trust decoded content blindly; it could be anything.
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