Base64 URL-Safe Converter
Convert standard Base64 into URL-safe Base64 by replacing +/ with -_ and optionally removing padding. Runs locally in your browser.
Input
Output
Tip: You can verify in DevTools → Network that nothing is uploaded.
About this Base64 URL-Safe Converter
Base64 URL-Safe Converter transforms Base64 strings into the URL-safe variant used by many web systems (for example JWT tokens). It replaces + with - and / with _, and commonly removes trailing padding (=).
This tool does not decode Base64 into plain text — it only converts between Base64 representations. Use Base64 Decode when you want to recover the original text.
- Process text data quickly without external tools
- Transform content for development workflows
- Clean and format text for analysis
- Enable Auto to transform as you type
- Upload text files directly from your device
- Download the result when done
FAQ
No. Everything runs locally in your browser. Nothing you paste is sent to a server.
After the page loads once, it will typically keep working offline (unless you hard refresh with no cache).
No. Your input stays in your browser. Only optional preferences like theme or language may be stored.
Any plain text. You can paste text directly into the input box.
That is the URL-safe variant. It avoids + and / which can be problematic in URLs or filenames.
Some systems omit padding for shorter strings. Some decoders require padding to be restored. If a system fails to decode, try adding padding back.
No. This tool changes the Base64 alphabet. It does not convert Base64 into plain text.