Base64 Decoder
Decode Base64 content back into readable text.
What this tool does
Decode Base64-encoded strings back into readable text to inspect payloads, debug API responses, and verify encoded config values.
Tool interface
Input
Output
Example input
aGVsbG8gd29ybGQ=
Example output
hello world
Step-by-step instructions
- Paste a Base64 string into the input field.
- Click Transform to decode the value.
- Review and copy the decoded output for debugging or verification.
Common use cases
- Inspecting encoded payload values from logs.
- Decoding API response fields for debugging.
- Verifying whether an integration output is valid Base64.
Quickly reveals encoded payload content during API debugging, token analysis, and integration troubleshooting.
Common mistakes to avoid
- Decoding malformed strings with missing padding characters.
- Assuming decoded output is JSON without validating it.
- Mixing URL-encoded text with Base64 data in a single step.
Frequently Asked Questions
Why can Base64 Decoder fail on some strings?
Failures usually come from invalid characters, truncated input, or incorrect padding.
Can Base64 Decoder handle URL-safe Base64?
This decoder expects standard Base64 input. Convert URL-safe variants first if needed.
Why does decoding fail?
Input must be valid Base64 with proper padding.
Can I decode URL-safe Base64?
Standard Base64 input is expected.
Can this decode JWT segments?
For full token inspection use JWT Decoder, which parses header and payload automatically.
What input format does Base64 Decoder expect?
Use the format shown in the example input on this page.
What does Base64 Decoder output?
It returns transformed output that you can copy directly from the result panel.
Why might Base64 Decoder return an error?
A common issue is: Decoding malformed strings with missing padding characters.
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