OGG and Opus audio — voice notes included — as MP3s that open anywhere, converted 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 pre-set to MP3 — the compatibility escape hatch for OGG and Opus audio.
FFmpeg runs in your browser; nothing is uploaded, and batches download as one ZIP.
This is a pre-set view of the Audio Converter. Every option in the toolbar can still be changed.
OGG is the open audio format: WhatsApp and Telegram voice notes (Opus), game assets, and many recorders use it. Excellent format — until an app or car stereo refuses it.
Yes — Opus voice notes decode perfectly; 128 kbps MP3 output keeps them small and clear for sharing or transcription tools.
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.