Convert
Shrink WAV recordings into MP3
Convert uncompressed WAV recordings into much smaller MP3 files at a bitrate you choose, locally.
For the best results: A 3-minute WAV is roughly 30 MB; at 192 kbps MP3 it becomes about 4 MB with quality most listeners cannot tell apart. Keep the WAV original if you plan to edit again, re-encoding an MP3 loses a little more each time.
Advanced settingsoptional, defaults work well
Converted entirely in your browser, your files are never uploaded. Very large files depend on your device's memory.
What is WAV to MP3?
WAV to MP3 is a free file converter that compresses large uncompressed WAV recordings into small MP3 files at 128, 192 or 320 kbps. The audio is converted by an ffmpeg engine that runs inside your browser, so your recordings never leave your device. No upload, no queue, and no account, and once the engine has loaded it works even offline.
- ✦Runs entirely in your browser. Nothing you enter is ever uploaded
- ✦No account, no sign-up, and no data leaves your device
- ✦Works offline once the page has loaded
See it in action
Studio WAV exports are perfect for editing and terrible for sharing.
What you drop in
master.wav, quality Max (320 kbps)
What you get
master.mp3 around a tenth of the size at the highest MP3 quality, duration matching the source exactly in the test run.
Tip: 320 kbps is as good as MP3 gets and is transparent for almost all listeners. Keep the WAV as your editing master; the MP3 is the sharing copy.
Use cases
What people use it for
Shrink field recordings from a handheld recorder so a full session fits in one email.
Compress Audacity WAV exports into MP3s light enough for a website's audio player.
Turn rehearsal-room WAVs into MP3s the rest of the band can stream in a group chat.
Who uses WAV to MP3?
Field recordists
compress location audio into shareable MP3s on site, keeping the raw WAV masters for later editing
Voiceover artists
send audition takes as light MP3 files while client scripts and raw takes stay on their machine
University lecturers
condense recorded seminars from bulky WAVs into MP3s that upload quickly to the learning portal
How it works
- 1Choose your files. They open in your browser, not on a server.
- 2Your device converts, compresses, or resizes them locally, with no upload.
- 3The converted files download straight back; nothing is kept anywhere.
Tips for the best results
- Do all your editing on the WAV and make the MP3 the final step, never an intermediate one.
- Spoken recordings rarely benefit from anything above 128 kbps, so save the space.
- Name output files with the bitrate included if you are producing several versions of one recording.
- A stereo WAV of a mono source wastes half its size, so consider recording mono speech in future.
- Batch your conversions in one sitting, since the engine stays loaded while the tab is open.
FAQ
Frequently asked questions
Why are WAV files so enormous compared to MP3s?
A WAV stores raw, uncompressed PCM audio: tens of thousands of amplitude measurements every second, each written out in full. At CD quality that works out to roughly ten megabytes per minute of stereo sound. MP3 instead keeps only what human hearing can actually perceive, which is why the same minute of audio can drop to about one megabyte.
How much quality do I give up going from WAV to MP3?
Technically the conversion is lossy, since MP3 discards data the encoder judges inaudible, using a model of how louder sounds mask quieter ones. Practically, a 320 kbps encode from a clean WAV is indistinguishable from the original for nearly all listeners and playback gear. The audible risk only appears at low bitrates or after repeated re-encoding.
What bitrate should I choose for my WAV files?
Let the content decide. Voice memos, dictation, and interviews compress beautifully at the lower settings because speech is spectrally simple. Full-band music deserves 192 kbps or above, and anything destined for critical listening should get 320 kbps. When unsure, encode a short test at two settings and compare them on the headphones you actually use.
Is my recording kept private during the conversion?
Entirely. The encoder is ffmpeg running as WebAssembly inside the page, so your WAV is read into local browser memory, converted there, and handed straight back as a download. Nothing is transmitted, logged, or stored anywhere else, which matters when the recording is a client interview, a therapy note, or an unreleased track.
Can I convert very long WAV recordings?
Usually yes, but the practical ceiling is your device's memory rather than any imposed limit, because the whole file is processed in the browser rather than on a server. Multi-hour uncompressed recordings are heavy, so on a modest laptop or phone it helps to close other tabs first, or split marathon sessions into parts.
How do I convert WAV to MP3 without losing quality?
Strictly speaking you cannot, because MP3 is lossy by definition, but you can make the loss inaudible. Encode at 320 kbps from the original WAV, avoid converting a file that was already an MP3 earlier in its life, and keep the WAV as your master so future copies never compound the compression.
Does WAV to MP3 conversion work without internet?
It does once the engine is in place. Your first visit downloads the WebAssembly converter, about 31 MB, which the browser then caches; from that point the page functions with the network switched off. That suits recordists working in remote locations where uploads to a conversion website would be impossible anyway.
Why do professionals record in WAV instead of MP3?
Editing and processing punish compressed audio. Every effect, mixdown, and re-export of an MP3 involves another lossy generation, and the artefacts stack. WAV holds the full signal, so engineers can cut, filter, and remix endlessly with no degradation, then compress exactly once at the very end for delivery.
Are there any usage limits?
None. Everything is generated locally in your browser, so there is no server cost, no metering, and no daily cap, use it as many times as you like, completely free.
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