Drop a PNG file and get an instant Base64 string. The default output is a complete data URI you can drop into an HTML img tag, a CSS background, or a JSON field. All encoding runs in your browser.
How it works
The tool reads your image with the FileReader API as a data URL. FileReader returns a string of the form data:image/png;base64,XXXX, where everything after the comma is the Base64-encoded file. The tool can show the full URI, strip the prefix to return raw Base64, or wrap it in a CSS background snippet, all in your browser tab.
Processing runs in your browser
All Base64 encoding happens locally in your browser tab using FileReader. Our servers are not involved at any point. You can verify this yourselfin your browser's DevTools Network tab.
Frequently asked questions
- Is my PNG uploaded to a server?
- All PNG to Base64 encoding runs in your browser using FileReader. Our servers are not involved at any point.
- Does encoding preserve the PNG transparency?
- Encoding is byte-perfect. The resulting data URI carries the same alpha channel as the original PNG, so transparency renders correctly anywhere the URI is used.
- When should I inline a PNG as Base64?
- Inlining works well for small icons, email signatures, or single-file HTML reports. For larger PNGs prefer a regular asset URL to keep the document size small.
- How big will my Base64 PNG be?
- Roughly 33 percent larger than the original file because Base64 uses 4 ASCII characters per 3 binary bytes. The size badge below the output shows exact numbers.
- Can I decode this Base64 back into a PNG?
- Yes. Pasting the full data URI into any browser address bar or HTML img tag renders the original PNG. The Base64 string can also be decoded with any standard library.