Fix an MKV video with no sound
When an MKV plays but stays silent, its sound is usually Dolby Digital (AC-3) or DTS, which many players, browsers and TVs cannot play. Convert it to MP4 here and the sound comes out in a kind that plays everywhere.
- Never uploaded
- No size limit
- No watermark
- Free
Keep this tab open and in front. Browsers slow down background tabs.
Quick answer: To fix an MKV video with no sound, drop the file into the tool at the top of this page and press "Convert to MP4". iLoveAudioVideo does the work in your browser, so the file is never uploaded. It is free, with no sign-up and no watermark.
Updated
How it works
- Drop your videoThe file is read on your computer, never uploaded.
- ConvertMany videos convert in seconds with no quality loss; the rest are converted at high quality.
- Download the MP4Plays on Windows, Android, iPhone, Mac and every website.
Why MKV files go silent
MKV files from films, TV recordings and some cameras often carry surround sound in Dolby Digital (AC-3) or DTS. The Windows Media Player and Films & TV apps, Chrome, many phones and many TVs show the picture but cannot play that sound, so the video looks fine and stays silent.
A quick check: if the same file has sound in VLC, the sound format is the problem, and converting fixes it.
The fix, in your browser
Drop the MKV above. The sound is converted to the kind every phone, browser and TV plays, and the picture is copied unchanged when it is already in the most common format, so it looks exactly the same. Nothing is uploaded.
Size limit: files with this kind of sound go through a slower backup path that handles results up to about 1 GB. A clip or a TV episode is fine; a full-length film is usually bigger.
If no video has sound
When every video is silent, not just MKVs, the cause is on the computer: check the volume and the output device, and update the sound driver.
Measured, not promised
From our tests on a 2019 Intel MacBook, an Apple M1 and a Windows PC without a graphics card. See all results.
Why your video never leaves your computer
Online video tools upload your file to their servers, process it there, and send it back. That is slow for big videos and costs them money for every minute, so free plans cap your file size or add watermarks, and your video sits on someone else's computer.
Here your own computer does the work, inside this tab. Nothing is uploaded, so there is nothing to cap: no file size limit, no daily limit and no watermark.
Questions
Does the picture lose quality?
Not when it is already in the most common video format: then it is copied unchanged and only the sound is converted. Other videos are converted at high quality.
Is my file uploaded?
No. The conversion runs inside your browser and the MP4 is saved straight to your computer.
Can I convert several files at once?
Yes. Choose or drop several files together. They are converted one after another with the same settings, and you can download each one or all of them in one ZIP.
Is it really free?
Yes. Your computer does the work, so a video costs us nothing to process. No account, no watermark, no limits.
Is my video uploaded?
No. It is processed inside this browser tab and saved straight back to your computer.
Which browsers work?
Recent Chrome, Edge and Safari on a computer. Chrome and Edge are fastest on most machines. Phones work for short videos.
How long does it take?
In Chrome, a one-minute 1080p video took 13–19 seconds on the laptops we tested and about 40 seconds on a computer without a graphics chip. Safari can be slower.
Can I close the tab while it works?
Keep the tab open and in front until it finishes. Browsers slow down background tabs.