Private, local repair
How to repair a corrupted MP4 without uploading it anywhere
Most "free online MP4 repair" sites have a catch: you have to hand them your video first. For a crashed stream, an unreleased edit, or anything private, uploading the file to a stranger's server is exactly what you don't want to do — and for a 50GB recording it's painfully slow anyway. Here's how to repair a corrupted MP4 entirely on your own PC.
Why uploading your footage is a problem
Online repair services work by receiving your file, processing it on their infrastructure, and sending back a result. That means:
- Privacy exposure. Your footage sits on a third-party server, subject to their retention and security practices — not yours.
- Upload time. Large recordings take hours to upload, and many services cap file size or paywall anything big.
- A repair you can't verify. You're trusting an opaque process with the only copy of footage you can't re-record.
If the recording contains anything you wouldn't post publicly — client work, personal moments, unreleased content — treat uploading it to an online repair tool as a real privacy decision, not a convenience.
Local repair: how it works
A desktop tool does the entire repair on your machine. The file is read from your disk, rebuilt in place, and written back out — nothing is transmitted anywhere. For corrupted recordings, the repair reconstructs the missing moov atom (the index a player needs), often using a short reference clip recorded with the same settings. We cover the mechanics in detail in how to fix a corrupted OBS recording.
Large files take longer to process and need sufficient disk space and memory. Video repair runs locally; purchasing and license validation require an internet connection.
Online vs. local repair
| Online repair sites | Local repair (StreamSalvage) |
|---|---|
| Upload required | Nothing leaves your PC |
| File-size caps common | No upload step |
| Slow upload/download | Reads straight from disk |
| Footage on their servers | 100% private |
| Often subscription | $29 one-time |
Repair your MP4 without it ever leaving your PC
StreamSalvage runs entirely on your machine. Drop in the broken file, preview the repair for free, and pay $29 only if it works — no uploads, no size limits.
Download StreamSalvage for WindowsWhat to do right now
- Make a copy of the broken file and work on the copy.
- Download a local repair tool instead of uploading to a website.
- If the recording came from OBS or a screen recorder, have a short clean clip from the same source ready to use as a reference.
- Preview the repaired result before committing to anything.
Frequently asked questions
Can I repair a corrupted MP4 without uploading it?
Yes. Desktop repair tools process the file on your own computer, so the video never leaves your machine. StreamSalvage repairs corrupted MP4 files 100% locally — there is no upload step at all.
Are online MP4 repair sites safe for private footage?
Online repair services require you to upload your video to their servers, where it is processed and stored according to their policies. For private, sensitive, or unreleased footage, a local-only tool avoids that exposure entirely.
Is there a file size limit for local MP4 repair?
Local repair avoids uploading large recordings. Available disk space, memory, codec support, and file damage can still limit a repair. Keep room for the original, a working copy, and the recovered output, and check the preview before purchasing.
Does local repair work without an internet connection?
Yes. Because the entire repair runs on your PC, it works fully offline. An internet connection is only needed to download the tool and, for StreamSalvage, to validate your one-time license.