Is the base64url decoder private?
Yes. Missing padding is restored automatically while URL-safe characters are converted to the standard alphabet. All processing happens locally in your browser — nothing is uploaded to our servers.
Base64URL Decoder
Normalize Base64URL to standard padded Base64 for JWT, web tokens, URLs, and application data.
Runs locally in your browser
How to use it
- Paste your input or choose a file from this device.
- Run the conversion and review the detected type or preview.
- Copy the result or download it for your project.
Built for Base64URL values
Missing padding is restored automatically while URL-safe characters are converted to the standard alphabet.
No registration, watermark, queue, or server upload is required.
Use Base64 wisely
Base64 is ideal for text-only APIs, small embedded assets, test fixtures, and portable documents. It increases payload size, so external files are usually better for large public assets.
Frequently asked questions
Does this restore missing padding?
Yes. Padding is added automatically so the value can be decoded as standard Base64.
Can I use this for JWT debugging?
Yes. Paste a Base64URL segment to convert it to standard padded Base64 for inspection or further decoding.
When should I use Base64 for Base64URL values?
Use it when a text-only channel or API must carry binary data, or when a small Base64URL values asset needs to live inside a self-contained document. Prefer separate files for large, cacheable public assets.