Audio to Base64

How to convert audio to Base64

1. Drop an audio file on the box or pick one or more with the file picker. MP3, WAV, OGG, M4A, AAC and FLAC all work.
2. Play it in the preview to make sure it is the clip you want.
3. Output as starts on Data URI. Choose Plain Base64 for an API, or JSON for name, type, size and data together.
4. Press Copy output. For long recordings use Save as .txt.

Recognizing audio formats in Base64

The data URI uses the MIME type your browser reports for the file. If it reports none, the tool picks one from the extension. MP3 and AAC in M4A play in every current browser; Ogg, FLAC and WebM support is good but less universal, so test the formats your users have.

Where Base64 audio is useful

• Clicks, notification chimes and short game effects can be inlined in a single HTML file, so the page or game runs from one file without a server.
• Speech-to-text, translation and audio-analysis services often accept a recording as Base64 in a JSON field, together with its encoding and sample rate.
• A short sample stored as a Base64 constant lets you test an audio pipeline without a binary file in the repository.

For music, podcasts or anything longer than a few seconds on a website, link the file. Browsers stream a linked file and fetch it in ranges, while a data URI has to be in memory in full before playback starts.

How big encoded audio gets

Base64 is 4/3 of the file size, so the length follows the bitrate:

A minute of CD-quality WAV is over 14 million characters of Base64. Format-specific details are on MP3 to Base64 and WAV to Base64, and Base64 to Audio plays or saves a Base64 string you received.

Play Base64 audio in JavaScript

const beep = new Audio("data:audio/mpeg;base64,SUQzBAAAAAAAI1RTU0UAAAAPAAADTGF2...");
button.addEventListener("click", () => beep.play());

Browsers block audio that starts without a user gesture, so call play() from a click or key handler. Decoding and other variants are covered in Base64 in JavaScript.

FAQ