Paste any Base64 string and decode it to plain text instantly — all in your browser, no data sent anywhere.
| Feature | pure-flon Decoder | Typical Online Decoder |
|---|---|---|
| Client-side only | ✓ Yes — runs in browser | ✗ Often sends to server |
| URL-safe Base64 | ✓ Supported | ↔ Varies |
| Privacy | ✓ Zero data collection | ✗ Ads & tracking |
| Auto-decode | ✓ As you type | ✗ Manual only |
| Offline use | ✓ After first load | ✗ Requires connection |
| Cost | ✓ Free forever | ✓ Free (with ads) |
Paste the Base64 string into the input box above and click Decode. The tool will instantly convert it back to the original plain text. You can also just type — it decodes automatically.
If the original data was binary (an image, PDF, or other file), decoding it as text will produce unreadable characters. This decoder is designed for text-encoded Base64 strings. Binary files need to be decoded and saved as their original file type.
Standard Base64 uses + and / characters, which are special characters in URLs. URL-safe Base64 replaces them with - and _. Enable the checkbox if your string contains hyphens and underscores instead of plus signs and slashes.
Yes. All decoding runs in your browser using JavaScript's built-in atob() function. No data is transmitted to any server. Your input never leaves your device.
Use the full Base64 Encoder & Decoder tool to both encode and decode.
Open Base64 Encoder & Decoder →