Convert any audio file, in your browser
MP3, WAV, FLAC, AAC, OGG, M4A — all of them, all in your browser. No upload, no signup.
How it works
1
Drop a file
Audio or video — we'll grab the audio from the video automatically.
2
Pick a format
MP3 for max compatibility, FLAC for lossless, M4A for Apple devices.
3
Download
Encoded with sensible defaults; tweak bitrate for lossy formats.
Why use Toolstack's Audio Converter?
100% private
Your file never leaves your device — everything runs locally in your browser.
Instant
No upload, no queue. The result is ready as soon as your laptop finishes the math.
Free forever
No signup, no credit card, no daily limits for the core features.
Open standards
We use proven open-source libraries — no proprietary lock-in, no shady tracking.