Convert to FLAC — Free
Files convert instantly in your browser — 100% private, any file size, no account needed.
Drop your FLAC file here
or click to browse — any size
Conversion runs entirely in your browser — your file never leaves your device.
How to convert to FLAC
Convert your audio files to FLAC quickly and for free with BoltConverter. Our online tool processes your files entirely within your browser using WebAssembly. This means your files never leave your device, ensuring maximum privacy and security.
FLAC is a lossless audio format, perfect for preserving sound quality. Get started now to convert your audio to high-fidelity FLAC without any software downloads or complicated settings.
Select Your Audio File
Click the "Choose File" button to upload the audio file you want to convert to FLAC.
Start Conversion
Once your file is loaded, click the "Convert" button to begin the in-browser FLAC conversion.
Wait for Processing
BoltConverter will process your file directly in your browser, which may take a moment depending on file size.
Download Your FLAC
After conversion is complete, click the "Download" button to save your new FLAC file to your device.
Frequently asked questions
Is BoltConverter's FLAC converter free to use?
Yes, BoltConverter is a completely free online tool. There are no hidden costs or subscriptions required.
Do my files get uploaded to a server for conversion?
No, your files never leave your device. All conversions happen locally in your web browser using WebAssembly technology.
Is there a file size limit for conversions?
Since conversions run in your browser, there is no server-side file size limit. Your device's memory is the only constraint.
What quality can I expect from the output FLAC file?
FLAC is a lossless format, meaning the converted file will retain the original audio quality without any data loss.
Can I convert multiple files to FLAC at once?
Currently, BoltConverter processes one file at a time. You can convert files sequentially by repeating the steps.