Repair Corrupted Video Files Online

That is the classic case and usually yes. An MP4 keeps its index at the end, so a download or a card copy that was cut short leaves the picture data intact but the map missing — the player finds the beginning and then walks off a cliff. Recovery mode scans the file for the frames themselves and builds a fresh index around them. The health score tells you what it found before you commit to a mode.

Quick Fix remuxes the file (lossless, fast) — fixes container and header issues. Deep Repair re-encodes the entire video — fixes frame-level corruption. Recovery mode uses maximum effort for severely damaged files. Auto mode tries strategies in order until one works.

Not because of its size — because of how much of it arrived. The file is read once in full, so the practical ceiling is what the browser tab can hold, and several hundred megabytes go through normally on a desktop. What actually decides the outcome is the damage: a file whose frames are all present but whose index is wrong rebuilds cleanly, while a download that stopped two thirds of the way through is missing the last third for good.

Some damage is irrecoverable — for example, if part of the video data is permanently lost (truncated recording). The tool recovers as much as possible, but the recovery score shows what percentage was salvaged.

Yes. Corrupted recordings from drones, dashcams, GoPro, security cameras, and phone recordings are common use cases. The tool handles interrupted recordings, power-loss damage, and SD card errors.