Is the base64url encoder private?
Yes. Base64URL uses hyphens and underscores instead of plus signs and slashes, making values safer in URLs and filenames. All processing happens locally in your browser — nothing is uploaded to our servers.
Base64URL Encoder
Convert standard Base64 to URL-safe Base64 by replacing unsafe characters and removing optional padding.
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 URL-safe Base64
Base64URL uses hyphens and underscores instead of plus signs and slashes, making values safer in URLs and filenames.
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
What changes when converting to Base64URL?
Plus signs become hyphens, slashes become underscores, and trailing padding equals signs are removed.
Where is Base64URL used?
JWT segments, URL parameters, filename-safe tokens, and other contexts where standard Base64 characters are problematic.
When should I use Base64 for URL-safe Base64?
Use it when a text-only channel or API must carry binary data, or when a small URL-safe Base64 asset needs to live inside a self-contained document. Prefer separate files for large, cacheable public assets.