Guide
Find MKV and MP4 copies of the same video on a Mac
An MKV and an MP4 of the same video are two containers around the same footage, often with different codecs and sizes, so their checksums never match. Dup compares the frames themselves and groups MKV, MP4 and MOV copies of one clip together on your Mac.
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Reaches folders App Store apps can't
The facts
- A container such as MKV, MP4 or MOV wraps the video stream, and converting between them or re-encoding changes every byte of the file.
- Dup decodes each file with its own bundled tools, so MKV files need no extra player or FFmpeg install.
- Each group lists every copy with its resolution and size, so you can see which one is worth keeping.
One clip in three files, a 4K MOV, a 1080p MP4 and a copy, found by Dup as one group even though their names, sizes and formats differ.
One clip in three files, found as one group
Step by step
| Step | What you do | What Dup does |
|---|---|---|
| 1 | Add the folder or drive that holds your MKV and MP4 files | Finds every video there, whatever its container |
| 2 | Start the scan | Fingerprints the frames of each video on your Mac |
| 3 | Review each group | Shows the MKV and MP4 copies of one clip together, with resolution and size |
| 4 | Remove the copies you do not need | Moves them to the Trash, and the cleanup can be undone |
Frequently asked questions
How do I find duplicate MKV and MP4 files on a Mac?
Scan the folder with a tool that compares video frames rather than file bytes. Dup does this on your Mac and groups MKV, MP4 and MOV copies of one clip, whatever their codec.
Should I keep the MKV or the MP4?
Keep the copy with the higher resolution in a format your devices play. Dup shows resolution and size side by side, and auto-keep can choose by resolution for you.
How much does Dup cost?
Dup is free to download and removes up to 250 MB of duplicates at no cost. Pro removes that limit for $29.99 a year, or $39.99 once for a lifetime license.
Try it on your own library
Free to try, with 250 MB of cleanup included. Nothing leaves your Mac, on any plan.
Pay with your Apple ID
Reaches folders App Store apps can't
macOS 13+