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TMP MP4
File conversion

Convert TMP to MP4

Verified by Adam B.· reviewed by FE Editorial ·updated Jul 17, 2026
QUICK ANSWER
Is it possible to convert TMP to MP4?
Yes - TMP converts to MP4.

Check bytes 4-7 of the file for the ASCII string ftyp; if present, copy the file and rename the extension to .mp4, then test playback in VLC. If those bytes are absent, the file does not contain MP4 data.

Also to MP4: AVCHD · USM · MXF

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert TMP to MP4?

A .tmp file has no fixed format - it is a naming convention for scratch data written by any program, dating back to MS-DOS and early Unix. Download managers and recording apps often stage video output as .tmp before renaming it on completion; an interrupted job can leave behind a file that is internally a valid .mp4 container. Video players reject .tmp regardless of the actual content.

How to convert TMP to MP4

VLC FREE

Copy the .tmp file, rename the copy's extension to .mp4, and open it in VLC to test whether the video plays; VLC can also re-encode the file via Media > Convert/Save if needed.

Grau GmbH Video Repair APP

If the renamed .mp4 plays partially or not at all due to an interrupted write, Grau GmbH Video Repair can rebuild the moov atom and recover as much of the video as possible.

About these formats

.TMP Temporary File

A TMP file is a temporary scratch file a program or the operating system creates to hold working data, such as autosave snapshots, installer payloads, or partial downloads. There is no…

Open .TMP details →
.MP4 MPEG-4 Part 14 Video File

An MP4 file is a video container (MPEG-4 Part 14, standardized 2003) that holds video, audio, subtitles, and chapters in one file. It plays on every phone, computer, browser, and smart TV…

Open .MP4 details →

Quality & what to watch

  • The .tmp extension carries no format information; two .tmp files from different programs may have completely different internal structures.
  • MP4 files always contain the string ftyp at byte offset 4-7; checking these bytes with HxD (free hex editor on Windows) confirms content before renaming.
  • If the file contains video data but was truncated mid-write, VLC may still play part of it.

Frequently asked questions

Is there a dedicated TMP-to-MP4 converter?
No - .tmp is not a format, so no converter exists; the only viable path is renaming when the file already contains MP4 data.
How do I check the file header on Windows?
Open the file in HxD (free hex editor) and look at bytes 4-7; if they read 66 74 79 70 (ASCII: ftyp), the file is an MP4.
What if the renamed file does not play?
The .tmp file does not contain MP4 data; it holds internal data from another program and cannot be made into a video.