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Fix corrupted MP4 video files online • Free to try

Fix a corrupted MP4 without installing anything.

If your MP4 won’t play, freezes halfway, or throws a “file corrupted” error, FixMyFile.ai gives you a last-resort repair attempt in your browser.

⬆️ Start repairing my MP4
Works best on files that play partially or used to work recently.
No login · No watermark · You only donate if we actually help.
🎥 MP4, MOV, MKV and more 🧠 AI-assisted pipeline Donation-supported instead of paywalled

How to repair your MP4 with FixMyFile.ai

In most cases, it takes under a minute:

  • 1. Go to FixMyFile.ai in your browser.
  • 2. Drop your corrupted MP4 into the upload area.
  • 3. Use the default Smart Repair mode.
  • 4. Let the system analyze and rebuild the file structure.
  • 5. Download the repaired version and try playing it locally.

Behind the scenes, your file travels through a Cloudflare Worker ➝ secure storage ➝ compute pipeline. We try to repair containers, headers, and timelines—not your footage itself.

Why this tool is donation-based

FixMyFile.ai runs on real infrastructure: storage, bandwidth, and CPU/GPU time every time a file is scanned, repaired, or converted.

Instead of locking this behind a monthly subscription, we:

  • Let anyone attempt repairs for free.
  • Don’t watermark or “hostage” your videos.
  • Rely on voluntary donations from people we actually help.

If FixMyFile.ai helps you rescue something important—client work, a memory, anything you can’t redo— please consider paying it forward so the next person has a shot too.

What usually breaks inside a “corrupted” MP4?

MP4 is a container format. The data inside (your video and audio) is separate from how that data is organized and labeled for players.

Typical failure points include:

  • Invalid or missing file headers.
  • Broken or inconsistent timestamps.
  • Interrupted writes during recording or export.
  • Partial downloads or copy failures.

When enough structure survives, tools like FixMyFile.ai can sometimes reconstruct a playable file around that data. Not perfect—but watchable, exportable, and savable.

MP4 repair FAQ

Can you guarantee 100% recovery?
No honest tool can. If the underlying bytes were never written (for example, the camera died before saving), there is nothing to recover. But many “corrupted” files are broken in how they’re packaged, not in the raw footage.
Is my video public or shared?
No. Files are processed through a pipeline built to return a result only to you. We don’t turn your uploads into a gallery or “content” feed.
Does this work for MOV, MKV and other formats?
Yes, FixMyFile.ai can also attempt repairs on common formats like MOV and MKV. For some issues, converting to a new container (e.g., MP4) is part of the recovery strategy.
Is there a size limit?
The system is optimized for real-world camera files, not multi-hour uncompressed masters. If you’re not sure, it’s still worth an attempt—it’s free to try.