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Convert local files into Base64 data URLs without uploading.
About this tool
Convert local files into Base64 data URLs without uploading.
File to Base64 is a free converter tool that runs entirely in your browser — nothing to install, no account to create, and your data never leaves your device. Open the page, add your input, and get a clean, copy-ready result in seconds.
Open File to Base64 on AltFTool — it loads instantly in your browser.
Upload or drag in the file you want to work with.
Adjust the settings and preview the result.
Download the finished file to your device.
Process images, audio, video, and documents directly in your browser — files never leave your device.
See the result before you export, so the final file is exactly what you expect.
Download output that's ready for your website, presentation, or client hand-off.
Yes — File to Base64 is completely free on AltFTool, with no signup, no trial limits, and no hidden costs.
Yes. File to Base64 runs in your browser, so what you enter or upload stays on your device instead of being sent to a server.
Convert local files into Base64 data URLs without uploading. It's built for quick, everyday converter tasks with results you can copy or download straight away.
Yes — File to Base64 works in any modern browser, on desktop, tablet, and mobile, with the same features everywhere.