Developer utility
Encoder / Decoder
Encode and decode Base64 and URL strings locally.
Your input stays in the browser — nothing is sent to a server. Privacy policy.
Best for
- Developers handling API payload fragments.
- Support and ops teams decoding incoming strings.
- Anyone converting Base64 or URL-encoded text quickly.
When to use
- Input data includes escaped symbols or unreadable blobs.
- You need to switch between encoded and plain values.
- You want fast conversion without command-line tools.
Options
Configure transform
Choose Base64 or URL mode, then pick encode or decode. Results update instantly as you type.
Mode
Direction
Input
Plain text
Type or paste plain text — it encodes as you type.
Output
Base64 result
Result appears here as you type.Try this example
Decode a Base64 JSON payload.
Action: Paste the Base64 string below and decode it to reveal the hidden JSON data.
Encoded input
eyAidXNlcklkIjogMTIzNDUsICJyb2xlIjogImFkbWluIiwgInNlc3Npb25FeHBpcmVzIjogIjIwMjYtMTItMzFUMjM6NTk6NTlaIiB9
What it reveals
Decoding the string instantly reveals a JSON object containing a user ID, admin role, and a session expiration date. You can now copy this and paste it into the JSON Format Studio for further inspection.
Do not rely on this for: Security. Base64 is not encryption; it only obfuscates data for transport. Sensitive data should be properly encrypted.
FAQ
Does Encoder / Decoder support Unicode text?
Yes. It handles common Unicode text for URL encoding and Base64 conversion in the browser.
What is the difference between Base64 and URL encoding?
Base64 turns bytes into a transport-safe text format. URL encoding escapes characters so they can safely appear inside URLs.
What happens if Base64 input is invalid?
The tool reports the conversion problem so you can fix the source string before using the decoded value.
Found an issue or have a suggestion? Report an issue or suggest an improvement.