WAV to MP3: a tenth of the size.
WAV is wonderful right up until you have to move it: an hour of 16-bit stereo is about 636 MB. The same hour as a 128 kbps MP3 is 58 MB, and as speech at 64 kbps it is 29 MB. This page does that conversion in your browser — significant, because most converter sites cap free uploads well below the size of a real WAV file.
Add your files
Drag files here, or press the button. Any common audio works — and videos too: we take just the sound out of an MP4 or MOV. Your files stay on your device the whole time.
MP3 · M4A · WAV · FLAC · Ogg · Opus · MP4 · MOV — even old AMR and WMA files. You can also paste a file from the clipboard.
Pick the format you want
Not sure? MP3 is the safe answer — it plays on everything.
Advanced options — quality, mono/stereo, volume+
The defaults are good — you can skip this whole box.
Higher = better sound, bigger file.
Mono halves the size — fine for voice.
Your privacy — live proof, not a promise
- Files uploaded
- 0 bytes
- Processing
- Not started yet
- Your files
- Stay in this browser tab — gone when it closes
- Converter engine
- Not downloaded — only fetched if a format needs it
One download, and it isn’t your audio
Converting to MP3 or WAV needs no download at all. Less common formats use a built-in converter engine (32.5 MB) that comes from this site — not from some other company — downloads once, and is then saved in your browser. Your audio is never part of that download: the engine comes to your files, your files don’t go to it.
Don’t take our word for it: open your browser’s DevTools, watch the Network tab, then convert a file. You’ll see nothing carrying your audio — because this page has no upload feature at all. There is nowhere for your file to go.
Scope note, so this stays exact: the claim is about your files — they never leave this device. The site around it is not claim-free. It loads Vercel Analytics for aggregate page traffic, plus Google Analytics and Ads tags if you accept the consent prompt. Those measure page visits and store-link clicks. They never receive your audio, because nothing does. Full privacy policy.
Converted files are never stored by this page — they exist only in this tab until you download them.
Shrinking, not just converting?
If the point is a smaller file — an attachment cap, a full phone — the free audio compressor solves backwards from a target size and lets you A/B the quality before you commit.
Convert, then transcribe
Need the words, not the audio? The free audio to text tool transcribes the same files on your device — no conversion step needed for anything a browser can decode. Or capture something new with the free online voice recorder.
The size cap problem, solved by not uploading
Upload-based converters meter by the megabyte, and WAV files are made of megabytes — a 50 MB free cap fits about four minutes of stereo WAV. Because this page converts on your device, the file never crosses a network and there is nothing to cap. A two-hour session WAV is as convertible as a ten-second clip; your RAM is the only ceiling.
Choosing the bitrate honestly
At the highest setting (320 kbps) almost nobody can tell an MP3 from the original. 128 kbps is the standard 'sounds fine' point for music; below that, crisp sounds like cymbals start to blur. Talking is far more forgiving — 64 kbps sounds clean, and 32 kbps is still perfectly understandable and tiny. If the WAV is a master you might edit again, also keep the WAV: MP3 is an export, not an archive.
This direction is the lossy one
WAV to MP3 throws information away — that is where the 90% goes. Converting the resulting MP3 back to WAV later does not bring anything back (see our MP3 to WAV page for what that direction is actually for). Encode once, from the original, at the rate you need.
How the conversion works
The same four steps whatever you drop in — none of them involve a server. The free online audio converter hub explains the whole pipeline, the format chooser and the comparison with upload-based converters.
Your browser opens the file itself
Drop a file in, and your browser reads it with the same built-in player it uses to play sound on any website. Videos work too — we take just the sound out of an MP4 or MOV and leave the picture alone. At this point nothing has left your device, and nothing will.
Your device does the converting
For MP3 and WAV, a small converter runs right here in this tab. For less common formats — Opus, Ogg, FLAC, M4A, or old files like AMR and WMA — a bigger converter engine (ffmpeg, ~32 MB) downloads once from this site and then also runs on your device. Either way, the work happens on your computer or phone, not on a server.
Trim and tidy before converting
You can cut silence off the start and end, make the sound louder, and choose the quality — all before the file is converted, so it is only converted once. Hidden info inside the file (like when and where it was recorded) is removed automatically, because a file you are about to share should not quietly carry that.
Download straight from this tab
The finished file is built in this tab and handed to you as a normal download — one at a time, or a whole batch bundled into a single ZIP. Close the tab and everything in it is gone. There is no account and no cloud copy, because there is no cloud.
WAV to MP3 — questions, answered
Is there really no file size limit for WAV to MP3?+
None imposed by us. The whole conversion runs in your browser's memory, so the practical limit is your device — we refuse files over 2 GB and warn before starting jobs that look heavy for the hardware. A desktop handles multi-hour WAVs; a phone is happier below half an hour.
What bitrate should I use converting WAV to MP3?+
For music: 192–320 kbps stereo. For speech: 64 kbps mono is clean, 96 generous. When in doubt use 128 kbps — the page shows the projected output size next to each choice, and the compressor page can solve backwards from a target size instead.
Will converting WAV to MP3 and back to WAV restore the quality?+
No. MP3 discards audio permanently; a WAV made from an MP3 is just the MP3's audio in a bigger box. Keep the original WAV if you may need lossless again — or convert to FLAC, which is lossless at about half of WAV's size.
Is this audio converter really free, with no limits?+
Yes. No account, no daily limit, no file-size tier and no watermark. Your own device does the converting, so an extra file costs us nothing — there is simply nothing for us to charge for or to cap.
Is my audio uploaded anywhere?+
No. The file is opened and converted inside your browser, on your device. This feature has no upload button behind the scenes — there is nowhere for your audio to go. Want proof? Open your browser's DevTools, watch the Network tab while you convert, and you'll see nothing carrying your audio.
What is the maximum file size?+
We don't set one. The real limit is your device's memory, because the whole file is handled in this tab. Files over 2 GB are refused, and if a file looks heavy for your device, the page warns you before starting. A laptop handles multi-hour recordings; a phone prefers shorter ones.
Does it work offline?+
Converting to MP3 or WAV works offline once the page is open. Other formats (Opus, Ogg, FLAC, M4A) need the bigger converter engine, which downloads once (~32 MB) from this site — after that it's saved in your browser, so those conversions work without re-downloading too.
Can I convert video files to audio?+
Yes. Drop in an MP4, MOV or WebM video and you get just the sound out of it — that's the whole 'MP4 to MP3' trick. The video itself is never uploaded or changed; only its audio is read.
Why is there no 'paste a link' option?+
Because this tool is for your files, from your device. A link box would turn it into a tool for downloading other people's audio from around the web, which is not what it's for — and every link would send someone's listening history through a converter. Local files only, on purpose.
What does 'remove hidden info' actually remove?+
Details stored invisibly inside the file: title, artist, album art, the exact time it was recorded, which app or phone recorded it, and sometimes even GPS location. It's removed by default because a file you're about to share shouldn't quietly tell people all that. Turn the option off and the details are kept instead.
Other conversions
Files worth converting start as recordings.
BlackBox records your day straight to compact, transcribed, searchable files on your phone — nothing to convert afterwards. Free on iPhone and Android.