FLAC to Base64
Use this free FLAC to Base64 converter to turn any Free Lossless Audio Codec audio file into a Base64 string or a ready-made code snippet. Select a local .flac file (or paste a link to a remote one), pick the output format and press Encode FLAC to Base64.
How to convert FLAC to Base64 online
- Choose Local file and select a .flac file, or choose Remote URL and paste a link.
- Select the output format: plain Base64, data URI, HTML tag, CSS, JavaScript, JSON or XML.
- Click Encode FLAC to Base64. The result appears instantly with a preview.
- Copy the result to the clipboard or download it as a .txt file.
About FLAC (Free Lossless Audio Codec)
FLAC compresses audio without losing a single sample, typically to 50–60% of the original WAV size. It is the favourite format for music archives and high-resolution downloads.
Because FLAC is lossless, files remain fairly large. Base64-encode FLAC when you need bit-perfect audio inside a JSON or XML payload, for example in an API or test fixture.
| Developed | 2001, Xiph.Org Foundation |
|---|---|
| Compression | Lossless |
| Bit depth | Up to 32-bit |
| Browser support | All modern browsers |
| File signature | "fLaC" |
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
Audioobject. - 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).
Frequently asked questions
How do I convert FLAC to Base64?
Select your .flac file above and click "Encode FLAC to Base64". The converter reads the file in your browser and outputs the Base64 string or a ready data URI.
What does a Base64-encoded FLAC start with?
A FLAC file encoded to Base64 typically starts with "ZkxhQw". As a data URI it begins with "data:audio/flac;base64,".
Is there a file size limit?
There is no hard limit because the conversion runs locally, but very large files produce very long strings. Files up to about 50 MB work comfortably in modern browsers.
How do I convert the Base64 back to FLAC?
Use the Base64 to FLAC decoder: paste the string, and you can preview and download the original .flac file.
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