MP3 to Base64

How to convert MP3 to Base64 online

1. Choose Local file and select a .mp3 file, or choose Remote URL and paste a link.
2. Select the output format: plain Base64, data URI, HTML tag, CSS, JavaScript, JSON or XML.
3. Click Encode MP3 to Base64. The result appears instantly with a preview.
4. Copy the result to the clipboard or download it as a .txt file.

About MP3 (MPEG-1 Audio Layer III)

MP3 is the most universally supported compressed audio format. Its psychoacoustic model removes sounds the ear is unlikely to perceive, shrinking music roughly tenfold compared to raw audio.

Short MP3 clips such as notification sounds or UI clicks are good candidates for Base64 embedding, because they play in every browser without extra requests.

Output formats

Choose how the result should be wrapped. The converter can return:

• txt: only the Base64 string, ready to paste into code, a database field or an API request.
• uri: a complete data: URI that you can paste in a browser address bar or use anywhere a URL is accepted.
• html audio: an HTML5 <audio controls> player.
• html source: a media element with a nested <source> tag and MIME type.
• html embed: an <embed> tag.
• html object: an <object> tag with a type attribute.
• html hyperlink: an <a> link that downloads or opens the embedded file.
• html iframe: an <iframe> that renders the content inline.
• javascript audio: JavaScript that creates and plays an Audio object.
• javascript popup: JavaScript that opens the content in a new window.
• json: a JSON object with the file name, MIME type and data.
• xml: an XML element with the data inside a CDATA section.

Is it safe and how large will the result be?

Your file is never uploaded: it is read and converted locally by your browser using the File API, so even confidential documents stay on your device.

Base64 represents every 3 bytes with 4 characters, so the encoded result is about 33% larger than the original file (plus a few bytes for padding and the data URI prefix).