Check a video before you edit it
Drop in a file to read its length, frame size, frame rate and sound track, then see how much of the picture each destination keeps.
Updated November 12, 2026
Runs in this browser tab. Nothing you add is uploaded.
What it reads
The checker opens the file with the same code the Cutroom AI editor uses when you import. It reports the length, the frame size after rotation, the aspect ratio, the frame rate, whether there is a sound track, whether the frame rate varies, and whether the video is HDR.
Phones often record HDR and a variable frame rate by default. The editor turns HDR into standard range on export. Knowing both up front explains why some apps show washed-out color or audio that slowly drifts out of sync.
How it fits each destination
For each destination the table shows its aspect and the share of your frame a center crop keeps. A 16:9 video cropped to 9:16 keeps under a third of the picture, which is why a wide shot needs care when you turn it into a short. In the editor, the crop can follow your face instead of staying in the center.
The length column compares the file with Cutroom AI's default clip range for that destination. Those ranges are the editor's presets, not platform limits.
If the file won't open
MP4, MOV, WebM and MKV work, plus audio files. AVI does not. The checker needs WebCodecs, which current Chrome, Edge, Arc and Safari 26 have. If your browser can't decode the video track, exporting it as H.264 MP4 from another app usually fixes it.
Questions
Is the file uploaded?
No. It is read in this browser tab, and only the numbers are shown.
Is there a size limit?
There is no cap in the tool. Very large files take longer to open on slower machines.
Why does it say a different frame size than my camera?
Phones store many videos sideways with a rotation flag. The checker shows the size after rotation, the way the video plays.
Keep reading
Try it on your own footage.
The editor opens in your browser with no account, and the sample project doesn't use an edit.