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UTF-8
Base64 Encoder & Decoder (Offline & Secure)
Free online Base64 encoder and decoder — convert strings to Base64 and back with UTF-8 support and URL-safe toggle. Runs entirely in your browser.
How to use Base64 Decoder
- Type or paste your text into the left Input panel.
- Select 'Encode' or 'Decode' mode using the toggle.
- The result appears instantly in the right Output panel.
Edge Cases & Important Considerations
- Non-UTF-8 character sequences might cause decoding errors.
Keyboard Shortcuts
- Ctrl/Cmd + K — Open Command Palette to switch tools instantly.
Frequently Asked Questions
Is this Base64 Decoder safe for sensitive corporate data?
Yes, 100%. All processing runs client-side in your local browser memory. No text, tokens, payloads, or logs are ever transmitted to any remote server or analytics engine.
Can I use this tool offline?
Yes. Because this tool runs strictly on client-side JavaScript with zero external API dependencies, once loaded it functions completely offline.
100% Client-Side Privacy Guarantee
All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.