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Untrunc

untrunc.com

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Spec score 8.2 #6 of 33 in File repair tools

What it is

Untrunc repairs corrupted or truncated MPEG-4 video files by using a healthy reference clip to rebuild missing or damaged index metadata. It supports MP4, MOV, M4V, and 3GP containers, and leaves raw media data unmodified rather than re-encoding it. The reference must come from the same camera and use the same recording settings as the damaged file. Repairs run offline on local files, with no video uploads or telemetry. There is no file-size limit; streaming mode can handle files larger than available RAM. Windows downloads include a graphical interface and a command-line tool, while other platforms have a command-line workflow. The site describes support for GoPro footage and Sony XAVC, with the anthwlock fork adding compatibility and performance improvements. Optional stretch mode can adjust audio duration to match recovered video. Untrunc is free for personal and commercial use under GPL-2.0. It cannot repair empty files, corrupted raw video data, or non-MPEG-4 containers such as AVI and MKV.

Spec sheet

Purpose
Untrunc repairs corrupted or truncated MPEG-4 video files by using a healthy reference video to reconstruct missing or damaged index metadata.Read 9 Oct 2026 · untrunc.com
Intended users
The site names action-camera users, drone pilots, dashcam owners, screen recorders, security-camera operators, and videographers as users.Read 9 Oct 2026 · untrunc.com
Platforms
The site lists Windows binaries and Linux and macOS options through source builds, Docker, Snap, or Homebrew.Read 9 Oct 2026 · untrunc.com
Privacy
The site says repairs run offline on local files, with no video uploads or telemetry.Read 9 Oct 2026 · untrunc.com
Support
The site directs users to the anthwlock GitHub Issues page for technical support and says the informational website does not provide software support.Read 9 Oct 2026 · untrunc.com
License
The software is described as open source under the GPL-2.0 license and free for personal and commercial use.Read 9 Oct 2026 · untrunc.com
Audio sync
An optional stretch mode can adjust audio duration to match the recovered video track.Read 9 Oct 2026 · untrunc.com
Camera compatibility
The site describes support for GoPro footage and Sony XAVC, with the anthwlock fork adding compatibility and performance improvements.Read 9 Oct 2026 · untrunc.com
File-size limit
The site says Untrunc has no file-size limit and can process files larger than available RAM using streaming mode.Read 9 Oct 2026 · untrunc.com
Interfaces
The Windows download includes a command-line tool and a graphical interface; the site also describes a command-line workflow for other platforms.Read 9 Oct 2026 · untrunc.com
Limitations
The site says Untrunc cannot recover empty files, raw video data that is itself corrupted, or non-MPEG-4 containers such as AVI and MKV.Read 9 Oct 2026 · untrunc.com
Reference requirement
The reference video should come from the same camera and use the same recording settings as the damaged file.Read 9 Oct 2026 · untrunc.com
Repair method
It rebuilds the file structure without re-encoding or modifying the raw media data.Read 9 Oct 2026 · untrunc.com
Supported formats
The site lists MP4, MOV, M4V, and 3GP as supported container formats.Read 9 Oct 2026 · untrunc.com

Plans and prices

Free Free Free to download and use; no license fees or subscriptions. No usage or file-size limits · GPL-2.0 · Requires a healthy reference video from the same camera and recording settings Read 9 Oct 2026 · untrunc.com

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Strong points and limits

Strong points

  • Repairs MP4, MOV, M4V, and 3GP containers
  • Works offline on local files
  • No file-size limit; streaming supports files larger than RAM
  • Free for personal and commercial use
  • Windows downloads include graphical and command-line interfaces

Limits

  • Requires a healthy clip from the same camera and settings
  • Cannot recover empty files or corrupted raw video data
  • Does not support AVI or MKV containers

Who it suits

Untrunc suits action-camera users, drone pilots, dashcam owners, screen recorders, security-camera operators, and videographers with a damaged supported container and a suitable reference clip. It is available for Windows, macOS, and Linux.

Verdict

Untrunc can restore file structure when a suitable reference video is available, without re-encoding the media. Its format and recovery limits make the reference clip and the condition of the raw video essential considerations.

Where Specifiction places it

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