Why this tool is useful
Create a lossless archival or editing copy from browser-decodable MP3, WAV and other audio without sending the recording to a conversion service.
Local File Tools · runs locally
Private Audio to Lossless FLAC Converter
Decode a short browser-playable audio file and write a real 16-bit lossless FLAC stream locally with explicit sample-rate and channel controls.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
Web Audio decodes the selected recording in this tab. Bounded samples are optionally resampled or remixed, then written into FLAC STREAMINFO and checksummed verbatim frames by the local encoder.
Practical example
Select a short MP3, keep its sample rate, mix it to mono if required and download the resulting FLAC after checking its reported channel count and sample total.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.