How much smaller will the MP3 be?

CD-quality WAV runs about 1.4 Mbps; a 192 kbps MP3 is roughly 86% smaller, and 128 kbps about 91% smaller. The result card shows your file's exact numbers.

Are my files uploaded?

No. The first time you use an audio/video tool, your browser downloads the open-source FFmpeg engine — a 32 MB file, roughly 10 MB once your connection compresses it — as a static file, and that is the only network traffic. Your media files are then processed entirely on your device and never reach a Filesvo server.

Does this work on phones?

Yes on recent devices, with limits: the engine is a 32 MB file (roughly 10 MB compressed in transit), and phones have less memory available to the browser, so large videos can fail on mobile. If a file fails on your phone, try a smaller file or a desktop browser. The 100 MB per-file limit applies everywhere.

Convert WAV to MP3 Online

WAV files are uncompressed and enormous — about 10 MB per minute of CD-quality stereo. Converting to MP3 with the LAME encoder keeps the sound while cutting the size by roughly 90%, so recordings become easy to send and store.

or drag and drop a .wav file here — up to 100 MB

This tool runs the open-source FFmpeg engine in your browser. First use downloads it once (a 32 MB file, roughly 10 MB compressed in transit); after that it loads from your browser cache. Your files are never uploaded. The engine is ffmpeg.wasm, distributed unmodified under the GPL-2.0-or-later.

Processed on your device — files are never uploaded to Filesvo.

How to use Filesvo

Select or drop a WAV file (up to 100 MB).
Choose a bitrate — 192 kbps is transparent for most material.
Click Convert to MP3 and download the result.

About WAV-to-MP3 conversion

WAV stores every audio sample raw, which is ideal inside a recording or editing workflow but wasteful for sharing and playback. MP3 discards perceptually redundant detail; at 192 kbps and above, listeners in controlled tests rarely tell the two apart.

Conversion is one-way: making an MP3 discards data that a later WAV conversion cannot restore. Keep your original WAV if it's a master recording — and convert a copy here for distribution.

The FFmpeg command this runs

This tool is FFmpeg itself, compiled to WebAssembly and running in your browser. Below is the command it builds with the options set as they arrive — generated from the same code that performs the conversion, not written out by hand, so it cannot drift out of date. Paste it into a terminal with FFmpeg installed and it does the same job there.

ffmpeg -y -i input.wav -vn -c:a libmp3lame -b:a 192k output.mp3

What each option on the tool changes in that command:

MP3 bitrate

128 kbps — smaller file — -b:a 128k

192 kbps — recommended — -b:a 192k

320 kbps — highest quality — -b:a 320k

The input and output names are placeholders. Your own filenames are used inside the browser, and neither file leaves your device.

Private by design

Your files are processed directly in your browser using the open-source FFmpeg engine compiled to WebAssembly and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

The engine is a static file your browser downloads once and then caches — the only network request this tool makes. It is used exactly as its authors published it; see the engines and their licences.

Frequently asked questions

How much smaller will the MP3 be?: CD-quality WAV runs about 1.4 Mbps; a 192 kbps MP3 is roughly 86% smaller, and 128 kbps about 91% smaller. The result card shows your file's exact numbers.
Are my files uploaded?: No. The first time you use an audio/video tool, your browser downloads the open-source FFmpeg engine — a 32 MB file, roughly 10 MB once your connection compresses it — as a static file, and that is the only network traffic. Your media files are then processed entirely on your device and never reach a Filesvo server.
Does this work on phones?: Yes on recent devices, with limits: the engine is a 32 MB file (roughly 10 MB compressed in transit), and phones have less memory available to the browser, so large videos can fail on mobile. If a file fails on your phone, try a smaller file or a desktop browser. The 100 MB per-file limit applies everywhere.

MP3 to WAV

Convert MP3 files into standard 16-bit PCM WAV files for editors, samplers and burning software.

Compress Audio

Shrink MP3, WAV, M4A, OGG and FLAC files to a bitrate you choose, with honest before/after sizes.

M4A to MP3

Convert M4A/AAC audio — iPhone voice memos, iTunes tracks — into MP3 files that play absolutely everywhere.