Convert WAV to MP3 on your Mac, offline
By Himanshu Ranjan · Updated 8 November 2026
To convert WAV to MP3 on a Mac, select the WAV in Finder, hold the right Option (⌥) key and choose Convert › Convert to MP3. FileDial saves the MP3 as a new file beside the original, so the WAV is untouched. The conversion runs on your Mac, the file is never uploaded, and it works with Wi-Fi off.
How to do it with FileDial
- Select one or more WAV files in Finder.
- Hold right ⌥ to open the dial at the pointer.
- Choose Convert › Convert to MP3 (or Convert to M4A, or Convert to FLAC).
- Find the new file saved beside each original, and use Undo on the result card if you change your mind.
Your original file stays untouched. The result is saved beside it, and every result has Undo.
Which option to pick
| Tool | Use it when |
|---|---|
| Convert to MP3Convert | You need a small file that plays almost anywhere. Saves a new MP3 copy beside the original. |
| Convert to M4AConvert | The file is headed for Apple devices or apps. Saves a new M4A copy beside the original. |
| Convert to FLACConvert | You want a smaller file without losing any audio. Saves a new FLAC copy beside the original. |
Lossy or lossless: picking MP3, M4A or FLAC
WAV stores audio uncompressed, which is why a few minutes of studio recording can run to a large file. Converting it means choosing between two kinds of compression. Lossless formats such as FLAC shrink the file while keeping every sample, so you can decode it back to an identical WAV later. Lossy formats such as MP3 and M4A (usually AAC audio) throw away detail the ear is least likely to notice, which makes them far smaller but means the discarded information is gone for good.
Bitrate, measured in kilobits per second (kbps), is how much data the encoder spends on each second of sound. Higher bitrates keep more detail; lower bitrates save space and start to smear cymbals, reverb tails and breaths. Music generally needs more bitrate than speech, and stereo needs more than mono.
A practical rule: keep your WAV or a FLAC copy as the master, and make MP3 or M4A copies for sharing. Converting one lossy file into another lossy format stacks the losses, so always encode from the original WAV when you can.
- MP3: the safest choice for compatibility with players, cars, websites and podcast hosts.
- M4A: a good fit for Apple devices and apps.
- FLAC: an archive copy that is smaller than WAV with no loss in quality.
Why not use an online WAV to MP3 converter
WAV files are often the rawest version of something private: an unreleased mix, a client interview, a voice memo exported for transcription, a recording of a meeting. Uploading them to a free converter hands that audio to a server you know nothing about, and you have no way to check whether it is deleted afterwards.
There is also a direct security risk. The FBI Denver Field Office warned on 7 March 2025 that free online document converter tools are increasingly used to spread malware: the conversion works, but the returned file can carry malware that leads to ransomware, and the sites can scrape personal data such as identity numbers, banking and crypto details, emails and passwords. That warning was about document converters, but the same pattern applies to any site that takes your file and hands one back.
FileDial converts on your Mac. Nothing is uploaded, every tool works with Wi-Fi off, and the app is signed with an Apple Developer ID and notarized by Apple.
Other ways to do it on a Mac
macOS already includes a free route. In the Music app, open Music › Settings › Files › Import Settings and set Import Using to MP3 Encoder. Then add the WAV to your library, select it and choose File › Convert › Create MP3 Version. The MP3 lands in your Music library rather than next to the original, and the WAV is added to the library too.
QuickTime Player can also save an audio-only copy with File › Export As › Audio Only, which produces an M4A rather than an MP3. GarageBand can import a WAV and share it as an MP3 if you are already editing in it.
FileDial is the better fit when you have a folder of WAVs to convert at once, when you want the MP3 saved right beside each original instead of inside a library, or when you want to undo a conversion with one click. It is one gesture from Finder, with no library to manage.
Questions
Does converting WAV to MP3 change my original file?
No. FileDial saves the MP3 as a new file beside the WAV, so the original stays exactly as it was. Every result also has Undo, which removes the new file if you change your mind.
Can I convert many WAV files at once?
Yes. Select as many WAV files as you like in Finder, hold right ⌥ and choose Convert › Convert to MP3. FileDial runs the tool on every selected file and saves each MP3 beside its original.
Is my audio uploaded anywhere?
No. Every FileDial tool runs on your Mac and files are never uploaded. All tools work with Wi-Fi off. The only things that go online are a licence check and optional anonymous usage counts, never file names, paths or contents.
Should I choose MP3 or FLAC?
Choose MP3 when you need a small file that plays everywhere, such as for sharing or a podcast host. Choose FLAC when you want to keep full quality in a smaller file than WAV, for example as an archive copy.
What does FileDial cost and which Macs does it run on?
There is a 1-day free trial with every tool, no card and no account. After that it is $20 once for a lifetime licence that works on 2 Macs. It needs macOS 14 Sonoma or later on an Apple silicon Mac.