Look at the original first
A copy that broke off doesn't touch the source. If the video still plays on the phone, the camera or the old drive, copy it again with a cable that holds, and keep the phone unlocked until the copy ends. On an iPhone, also check that the copy wasn't of an iCloud placeholder: with "Optimise iPhone Storage" on, the full-size video downloads first and that can stall.
Move on to a repair only when the copy is the only one left, because the source was deleted, moved or the device is gone.
What a broken copy looks like inside
An MP4 or MOV keeps its index, the moov atom, either at the start or at the end of the file.
| Where the index was | What a cut copy does |
|---|---|
| At the end, as most cameras and phones write it | The copy has the footage up to the cut and no index. It won't open at all. |
| At the start, as many edited or shared videos have it | The copy opens, plays up to the cut, then stops or errors. |
Both cases leave the footage before the cut intact. In our tests of files cut short, the checker kept every frame before the cut.
Repair the copy
- Open the copied video in the checker on this page. Your browser reads it from your disk; nothing is uploaded.
- The free check reports how much of the recording it found.
- Watch the free 15-second preview of your own video.
- Download the full repaired video for $4.99, or with a plan. If it doesn't play, write to support@nasrtech.dev and we'll look at it with you.
What the cut removed is gone from the copy. The repair gives you a file that plays from the start to the last complete frame.
How the engine got here
The test that matters for a broken copy ran on 17 September 2026: four encoders, index stripped, zeroed or cut at 70 %, and in every cut file the frames before the cut came back identical. The repair reached the Android app with 1.0.21 on 19 September, and the browser on 12 October.
What a user wrote
"Very useful app for recovering damaged or unplayable videos. I like that you can repair the file and preview the result before paying to save it." (Google Play review of the Video Repair app for Android, same engine, September 2026)
