Free Online Base64 Encoder/Decoder
Encode or decode text to/from Base64 format instantly.
Developer's Note
Uses the browser's built-in btoa/atob functions. Handles Unicode strings via encodeURIComponent/decodeURIComponent. All processing is local.
About This Tool
Free Online Base64 Encoder is part of UnTrackedTools - 88+ tools running entirely in your browser with no signup, no tracking, and no data uploads. This tool was built to solve a real problem with a clean, simple interface that works on desktop, tablet, and mobile.
Tips
- 1All processing happens locally in your browser. No data is ever uploaded to any server.
- 2Bookmark this page for quick access whenever you need the Base64 Encoder tool.
- 3Works on all modern browsers: Chrome, Firefox, Safari, and Edge.
- 4For best results on mobile, rotate your device to landscape for more screen space.
Frequently Asked Questions
Is my data safe when using this tool?
Yes, absolutely. All processing is done entirely in your browser using client-side JavaScript. Your files, text, and data never leave your device.
Do I need to create an account or sign up?
No. UnTrackedTools is completely free with no registration required. Start using any tool immediately without providing personal information.
Can I use this tool on mobile devices?
Yes. All tools are fully responsive and work on smartphones and tablets. The interface adapts automatically to your screen size.
Developer's Note
The Unicode handling was the hardest feature. Plain btoa() fails on non-ASCII. I chain encodeURIComponent first - the same technique MDN recommends for Chinese, Japanese, and emoji.
Privacy Guarantee
Like all tools on this site, this Base64 Encoder/Decoder processes data entirely in your browser. Nothing is ever uploaded to any server. No tracking, no analytics, no signup needed.