This page's audience our own tag's counts — open to see them

Period

–Visits

–Page views

–Clicks to vendors

–Time on page

–Reading now

Clicks to vendors, by tool

Top countries

Devices

– · visits, page views and clicks counted by our own tag, which counts more than our checked analytics; every figure rounded down · how we count

Untrunc

Free#21 of 33 in File Repair SoftwareVideo Repair Software

Untrunc: A focused, free tool for technical users repairing truncated MPEG-4 containers locally. Ranked #21 of 33 in File Repair Software by our editors (6.5/10); pricing: Free plan; best for technical users needing free open-source video repair.

6.5/10Editor score

Visit Untrunc

Untrunc6.5 Visit Untrunc

At a glance

Editor score
6.5 / 10
Pricing
Free plan
Best for
Technical users needing free open-source video repair
Free plan
Yes
Paid from
Free
Repair categories
MP4, MOV, M4V, 3GP
Facts checked
20 Sep 2026

Where it wins
- Repairs MP4, MOV, M4V, and 3GP containers
- Uses a healthy reference video to reconstruct missing metadata
- Free, open-source, cross-platform, and supports files over 2 GB
Where it doesn't
- The repair workflow depends on a healthy reference video
- Its focus is limited to specific MPEG-4 container formats
- The graphical interface is optional and available for Windows

Our verdict on Untrunc

Untrunc is a free, open-source utility for repairing truncated or damaged MPEG-4 container files. It is intended for technically comfortable users working with MP4, MOV, M4V, and 3GP files on Windows, macOS, or Linux. Repair runs locally and creates a repaired output file without modifying the original. The project offers a command-line workflow, an optional Windows graphical interface, and Docker support for container-based use.

Its standout feature is reference-video reconstruction. Untrunc uses a healthy recording to rebuild missing video metadata, preferably from the same camera and recording mode as the damaged file. The tool also supports files larger than 2 GB, advanced logging for troubleshooting, and options for skipping unknown bytes or adjusting audio-video duration. These controls give experienced users more room to investigate difficult repairs than a basic point-and-click utility.

Untrunc is a narrow file-repair tool rather than a broad media-recovery suite. Its local delivery, open-source model, command-line interface, and cross-platform support suit users who are comfortable selecting a reference recording and working through repair options. Choose it when the affected file matches its supported container formats and you can provide a suitable healthy video. Users seeking wider format coverage or a primarily guided graphical workflow should consider a different type of repair utility.

Your product? Our editors can test Untrunc in depth and publish a review, labelled as paid · from $149/mo →

Untrunc pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on untrunc.com

Untrunc fact sheet

Free plan	Yes
Paid from	Free
Repair categories	MP4, MOV, M4V, 3GP
Batch repair	Not verified
Preview before save	Not verified
Supported platforms	Windows, macOS, Linux
Maximum file size	Not verified
Repair delivery	Local
Deployment	Desktop, Self-hosted
Platforms	Windows, macOS, Linux
Support	Community, Docs
Built for	Solo, Small business (editorial estimate)
Pricing	Free plan
Website	untrunc.com
Facts checked	20 Sep 2026

Alternatives to Untrunc

See all Untrunc alternatives →

Also Ranked In

Untrunc is ranked in 2 of our directories.

#4Video Repair Software26 tools ranked

Used Untrunc? Be the first to review it

The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Untrunc for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

Write a reviewTwo minutes · verified accounts only · read by an editor before it appears

Reviews come only from verified accounts. Sign in or create an account first — your e-mail is never shown.

Title

Your review

0 characters · at least 80, up to 3,000

Pros (optional · one per line)

Cons (optional · one per line)

Your name (shown with your review)

Role (optional)

Company (optional)

How long have you used it?

I've used Untrunc myself and this is my honest opinion — nobody paid or asked me to write it.

Posted from your verified account. Reviews appear after an editor reads them, usually within two working days.

Featured on iTechGuides

Untrunc is listed in our File Repair Software directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/untrunc/"><img src="https://www.itechguides.com/best/badge/untrunc.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update