Convert MOV, WebM, MKV, and AVI to MP3
MP4 is not the only video format that can contain useful audio. You may also have MOV files from an iPhone, WebM recordings from a browser, MKV files from a desktop collection, or AVI files from older videos.
If you only need the sound, you can convert these video files to MP3 and save the audio separately. This is useful for meetings, lectures, screen recordings, phone videos, interviews, tutorials, and editing materials.
With Squishyfile, you can convert common video formats to MP3 directly in your browser. You do not need to install software or create an account. The file is processed on your device, so your video does not need to be uploaded to a server.
This guide explains how MOV, WebM, MKV, and AVI differ, how to convert them to MP3, and what to check if a video format does not work.
Why convert different video formats to MP3?
Video files can come from many devices and apps. A phone, camera, browser recorder, editing tool, meeting app, or old computer may all create different file formats.
Even though the file extensions are different, the goal is often the same: you want the audio track from the video.
Converting a video file to MP3 lets you:
- listen to the content without opening the video
- save storage space when the image is not needed
- share only the sound with someone else
- organize narration, interviews, or reference audio
- keep audio from phone videos or screen recordings
- review meetings, lectures, and tutorials more easily
The converted MP3 contains audio only. It does not keep the video image, captions, slides, subtitles, or screen activity.
How to convert a video format to MP3
The process is similar whether your file is MOV, WebM, MKV, AVI, or MP4.
Step 1: Choose your video file
Open the video to MP3 converter and choose a file from your device. You can drag and drop the video or click the upload area to select it.
The video needs to be saved on your computer, phone, or tablet. Squishyfile does not convert video URLs and is not a YouTube to MP3 downloader.
Step 2: Start the conversion
After selecting the file, start the conversion. Squishyfile reads the audio track inside the video and creates an MP3 in your browser.
Keep the browser tab open while the conversion is running. Large videos or complex files may take more time, especially on a phone.
Step 3: Download the MP3
When the conversion finishes, download the MP3 file to your device. You can play it in music apps, file apps, media players, cloud storage apps, or audio editing software.
The MP3 will contain the sound from the original video file. It will not include the visual part of the video.
Convert MOV to MP3
MOV is a video container commonly used by Apple devices and apps. If you record a video on an iPhone, iPad, or Mac, the file may be saved as MOV.
MOV files are often used for:
- iPhone videos
- iPad recordings
- Mac screen recordings
- QuickTime videos
- video files exported from Apple apps
- personal videos and work recordings
Converting MOV to MP3 is useful when you want to save only the sound from an iPhone video, meeting recording, class video, or personal clip.
For example, if you recorded a quick explanation on your iPhone but only need the voice, converting the MOV file to MP3 gives you a smaller and easier-to-play audio file.
If a MOV file does not convert, check that the video plays normally and contains audio. Some MOV files may use audio or video settings that are harder for a browser to process.
Convert WebM to MP3
WebM is a video format often used on the web. It appears in browser-based tools, online screen recorders, web apps, and some downloaded video files.
WebM files are common for:
- browser screen recordings
- online recording tools
- web app exports
- video clips saved from web-based workflows
- lightweight web video files
Converting WebM to MP3 is useful when you only need the narration, meeting audio, voice explanation, or recorded sound from a browser-created video.
Because WebM can use different codecs, compatibility depends on what is inside the file. If the WebM plays correctly in your browser and has audio, it is more likely to convert successfully.
Convert MKV to MP3
MKV is a flexible video container. It can hold video, audio, subtitles, chapters, metadata, and multiple audio tracks.
MKV files may appear in:
- desktop video collections
- exported video projects
- downloaded media files
- recordings with subtitles or multiple tracks
- archived videos
Converting MKV to MP3 is helpful when you want a simple audio copy from a more complex video file.
Because MKV can contain multiple tracks, the result depends on the audio track that the browser can read. Some MKV files may have unusual codecs or structures. If conversion fails, try playing the file first. If the file does not play normally in a standard player, it may need to be re-exported or converted to a simpler format before extracting MP3.
Convert AVI to MP3
AVI is an older video format that still appears in many saved video collections. It was widely used on older computers, cameras, and desktop recording tools.
AVI files may come from:
- old video archives
- older cameras
- legacy recording software
- saved desktop videos
- copied video collections
Converting AVI to MP3 can be useful when you want to preserve only the audio from an old video.
Some AVI files use older or less common codecs. The file extension alone does not guarantee that every AVI will convert. If an AVI file fails, check whether it plays in a modern media player and whether it actually has sound.
What about MP4?
MP4 is the most common video format and is usually the easiest starting point for video to MP3 conversion. It appears in phone videos, cameras, screen recordings, meeting recordings, and exported video projects.
If your file is MP4, read the dedicated guide: Convert MP4 to MP3 for free.
Video format vs audio codec
A video file extension tells you the container, but not always the exact audio format inside.
For example, two files may both end in .mp4, but they may contain different audio codecs. The same is true for MOV, WebM, MKV, and AVI.
This matters because conversion depends not only on the outer file format, but also on the audio stream inside the file.
If one MOV, WebM, MKV, or AVI file converts successfully and another does not, the difference may be caused by:
- the audio codec
- the way the file was exported
- file corruption
- missing audio
- multiple audio tracks
- an unusual file structure
- browser compatibility
When possible, open the original video in a media player before converting. If the file does not play normally, it may not convert properly either.
Browser-based conversion without installing software
Squishyfile processes video files in your browser using WebAssembly and FFmpeg. You do not need to install desktop software, download a mobile app, or create an account.
Your file does not need to be uploaded to a remote server for conversion. This is useful for personal videos, private recordings, internal work files, meeting recordings, training videos, and unpublished content.
Because conversion happens on your device, performance depends on your browser, file size, video length, available memory, and device speed. A desktop computer may work better for large or complex files.
Tips for converting MOV, WebM, MKV, and AVI to MP3
To improve your chance of a successful conversion, check these points before starting.
Confirm the video has audio
Some videos are silent, especially screen recordings or edited clips. If the original video has no sound, there is nothing to extract.
Try the file in a media player
If the video does not play in a normal media player, the browser may not be able to process it. The file may be damaged, incomplete, or created with an unusual codec.
Use a modern browser
Browser-based conversion works best in updated browsers. Try Chrome, Safari, Edge, or another modern browser.
Keep the tab open
Do not close or refresh the page during conversion. On mobile, avoid locking the screen until the process finishes.
Use a computer for large files
MKV, AVI, and long MOV files can be large. If your phone struggles, try the conversion on a desktop or laptop.
Keep the original video
MP3 is a compressed audio format. If the original file is important, keep it as a backup after creating the MP3.
When should you keep the original video?
Converting to MP3 is useful when audio is enough, but it is not always a replacement for the original video.
Keep the video if you need:
- slides or visual explanations
- subtitles or captions
- screen actions or software demonstrations
- facial expressions or visual context
- multiple audio tracks
- the highest-quality source file
The MP3 is best for listening, reviewing, sharing audio, and storing sound separately. It is not meant to preserve everything in the video.
Common problems and fixes
The converted MP3 is silent
The video may not have an audio track, or the browser may not be able to read the track. Play the original file and confirm that sound is present.
The conversion is slow
Large video files take more time. Close other apps, keep the tab open, and try using a computer for long recordings.
The file does not load
The file may be damaged, too large, or stored in a location the browser cannot access properly. Try moving it to a local folder, then select it again.
The format should be supported, but it still fails
The audio codec inside the file may be unusual. Try exporting the video again with common settings, or open it in a video editor and save a simpler version.
The phone stops processing
Mobile browsers can pause when the screen locks or memory is low. Keep the screen active or switch to a computer.
Frequently asked questions
Can I convert MOV to MP3?
Yes. MOV files from iPhone, iPad, Mac, and QuickTime can often be converted to MP3 if they contain a supported audio track.
Can I convert WebM to MP3?
Yes. WebM files from browser recordings and web tools can often be converted to MP3. Compatibility depends on the codecs inside the file.
Can I convert MKV to MP3?
Yes, in many cases. MKV files can be complex, especially if they contain multiple tracks or unusual codecs, so some files may need to be re-exported first.
Can I convert AVI to MP3?
Yes. Many AVI files can be converted to MP3, but older AVI files may use codecs that are harder to process in a browser.
Can I convert these formats on my phone?
Yes, for many files. For large videos or complex formats, a desktop or laptop may be more stable. See: Convert video to MP3 on iPhone and Android.
Does converting to MP3 keep subtitles?
No. MP3 is audio only. It does not contain subtitles, captions, images, or video.
Is this a YouTube to MP3 converter?
No. Squishyfile works with video files stored on your device. It does not download audio from YouTube or other video URLs.
Summary
MOV, WebM, MKV, and AVI files can all contain audio that you may want to save separately. Converting these video formats to MP3 lets you listen to the sound without keeping or opening the full video.
Squishyfile lets you extract audio from common video files directly in your browser. You do not need to install software or create an account, and your file does not need to be uploaded to a server.
To convert a video file now, open the free video to MP3 converter, choose your MOV, WebM, MKV, AVI, or MP4 file, and download the MP3.