How to Convert to MP3 on Windows & Mac
Updated August 31, 2026
Whatever you're starting from, an MP4 video, a WAV recording, an M4A voice memo, a FLAC album, the goal is the same: an MP3, because MP3 plays on everything ever made. The annoying part is that most converters handle one format family, so you end up with three different tools.
ConvertSave takes them all in one window. Drag in any mix of audio and video files on Windows or Mac, pick MP3 once, convert. Everything runs offline on your own computer.
How to convert any file to MP3
- 1
Drag your files into ConvertSave
Open ConvertSave and drag your audio and video files into the window. You can drop one file or a whole selection at once. There is no upload step, because the files never leave your computer.
- 2
Choose MP3 as the output format
Pick MP3 from the format list. ConvertSave shows the formats that make sense for the files you dropped, so MP3 is right there.
- 3
Click Convert
Hit the Convert button. Each MP3 file is saved next to the original, so you don't have to hunt through folders to find your converted files. The originals are left untouched.
The queue in the screenshots is deliberately mixed: a video, a voice memo, and a WAV, all headed to MP3 in one pass. That's the point of a general converter.
Which files can you convert to MP3?
- •Audio: WAV, M4A, AAC, FLAC, OGG
- •Video (the audio track is extracted): MP4, MOV, MKV, WEBM, AVI
For deeper dives on specific pairs, see the MP4 to MP3, M4A to MP3, and WAV to MP3 guides.
How to convert to MP3 on Windows
Windows has no built-in convert-to-MP3 anything, which is why the search results are wall-to-wall upload sites. ConvertSave runs locally on Windows 10 and 11; drag files in, pick MP3, done.
How to convert to MP3 for free
The 7-day free trial unlocks everything, batch conversion included, so a one-time pile of files costs nothing to convert. And unlike the free websites, nothing gets uploaded.
Batch converting to MP3
Queue as many files as you like, in any mix of formats, and convert them all with one click. Each MP3 is saved next to its source file. We've tested batches of up to a thousand files.
Is converting to MP3 safe?
The risk with converting your audio and video to MP3 isn't the conversion itself, it's where the conversion happens. Free converter websites work by uploading your file to someone else's server. You usually can't tell who runs the server, where it is, or how long your file sticks around after the conversion finishes. For personal videos and photos that's a real privacy trade, and it's the reason so many of those sites are covered in aggressive ads.
ConvertSave does the conversion on your own computer. Nothing is uploaded anywhere. You can turn off Wi-Fi entirely and it still works, which is also the easy way to verify the claim. Your original file is never modified, and the converted copy is written right next to it.
Frequently asked questions
Can I mix videos and audio files in one conversion?
Yes. Drop them all in together, pick MP3 once, and every file converts. Video files contribute their audio track.
Will the MP3s sound as good as the originals?
At normal bitrates you won't hear a difference for speech or music. If a source is lossless (WAV or FLAC) and you want to keep it that way, convert to FLAC or keep the original; the MP3 is for compatibility and size.
Do I need different software for different input formats?
No, that's the point. One window handles audio and video inputs alike, with FFmpeg and other engines doing the right thing behind the scenes.
Do my files get uploaded anywhere?
No. ConvertSave converts on your computer and works offline. Nothing leaves your machine.
Is ConvertSave free?
There's a 7-day free trial with all features unlocked. After that it's $9/month, $60/year, or $129 once for a lifetime license that covers 3 personal devices on Mac and Windows.
