Audio files small enough to attach — re-encoded at the bitrate you choose, on your own device.
MP3, WAV, M4A, FLAC, OGG… — or drop a video (MP4, MOV, WebM) to extract its audio · nothing is uploaded
No size limit · files are processed on your device and never uploaded · how it works
MP3 conversions run instantly in your browser — nothing to download. Other formats use the FFmpeg engine (31 MB, once).
Plays everywhere — the safe choice.
192 kbps is transparent for most music; 128 suits voice; 320 is the maximum.
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
This page opens the Audio Converter — compression here means re-encoding at a lower bitrate: drop files, pick MP3 and a bitrate, and each row shows the new size.
Everything runs on FFmpeg in your browser; recordings never leave your device.
This is a pre-set view of the Audio Converter. Every option in the toolbar can still be changed.
128 kbps for voice (podcasts, lectures, memos) — half the size of 256 with no practical loss for speech. For music, 192 kbps stays transparent for most ears; going below 128 becomes audible.
Yes — convert it to FLAC in the same tool: lossless, about half the size. MP3/OGG make it far smaller again, with a small, usually inaudible loss.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
InfyTool is built by the same team as these free libraries.