Convert an audio file into a Base64 data URI you can paste into HTML or CSS, and turn a data URI back into a playable file.. Audio to Base64 Converter is a free online tool from the ToolsRift Audio Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
In Encode mode choose an audio file and copy the generated data URI. In Decode mode paste a data URI or raw Base64, then play the result and download it as a file.
It embeds a sound directly in HTML, CSS or JavaScript so the page needs no extra network request. That suits tiny interface sounds, email-safe assets, and offline single-file demos.
Base64 represents three bytes with four characters, so encoded data is about 33 percent bigger than the original file. That is why data URIs suit short clips and are a poor choice for full songs.
No. The file is read with FileReader and converted to Base64 in your browser's memory. The resulting string only ever exists on your device unless you paste it somewhere yourself.