Files stay on your device
Free. No account needed.Base64 ↔ Base64URL
Convert a valid Base64 byte encoding to URL-safe form or back.
Result
Enter your values. Your result will appear here.
How it works
- Inspect the example or enter your own input.
- Check the units and operation, then run the tool.
- Review the result, then copy or download it. Keep a copy of your original data.
Example & practical use
Starting example: Input: SGVsbG8/
Limits and help
Validates padding and canonical encoded bits. This transforms an encoding, not plain text. Runs on your device without uploading input. Maximum 200,000 characters per field; numeric calculations use finite JavaScript numbers unless exact integer/decimal arithmetic is stated.
Your files are yours.
Image and text processing happens in your browser. Your files are not uploaded to our servers.
Troubleshooting
Base64 and URL encoding are different formats. Choose the matching decoder; remove a data:...;base64, prefix only when the tool expects raw Base64. Arbitrary binary files may not decode as UTF-8 text.