How Base64 becomes audio again
Base64 turns binary audio into text so it can travel through APIs, email, or config. This tool reverses that: you paste the text and get back a playable file.
What happens when you paste
The decoder strips whitespace and checks the character set. Data URLs like data:audio/mp3;base64,... tell the tool the format. Raw Base64 is identified from the first bytes (MP3, WAV, OGG, and others have distinct signatures). Four Base64 characters decode to three bytes, so the stream is rebuilt into binary and handed to the browser’s audio engine.
Formats and limits
Supported types include MP3, WAV, OGG, M4A, FLAC, WEBM, AIFF, and WMA. Very large strings may slow down the tab. If the string is not valid Base64 or not audio, you’ll see a clear error. For the opposite direction, use the Audio to Base64 tool. For other file types, try Base64 to File or Base64 to Image.
Where this is useful
Web and mobile apps often receive audio as Base64 from backends. Frontends decode and play without storing files. Email attachments and database blobs are other common sources. Everything here runs in your browser; nothing is sent to a server.
