20 MB MOV sample
A MOV file of exactly 20,971,520 bytes. It is a valid QuickTime movie file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy MOV file.
Download
sample-mov-20mb.mov
20 MB20,971,520 bytes
Download 20 MB MOVCreated in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.
- Type
- video/quicktime
- SHA-256
df989f75ad520b6a2d1c292ddd3865558ebc5b46b77dc5dfde5c144902a24cbd- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
11,186 frames (6 min 13 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one H.264 video track of a QuickTime movie. 517 bytes of a trailing "free" atom bring the file to the exact size.
| Dimensions | 640 × 360 px |
|---|---|
| Duration | 6 min 13 s |
| Frame rate | 30 fps |
| Video codec | H.264 (AVC), Main profile |
| Audio | No audio track |
| Container | QuickTime (brand "qt ") |
| Fast start | Yes (moov before mdat) |
First bytes of the file
The first 64 bytes of sample-mov-20mb.mov as a hex dump: offset, bytes, then the same bytes as text. The MOV signature is 66 74 79 70 71 74 20 20 at offset 4.
00000000 00 00 00 14 66 74 79 70 71 74 20 20 00 00 02 00 |....ftypqt ....|
00000010 71 74 20 20 00 00 bc ef 6d 6f 6f 76 00 00 00 6c |qt ....moov...l|
00000020 6d 76 68 64 00 00 00 00 e5 7b 69 80 e5 7b 69 80 |mvhd.....{i..{i.|
00000030 00 00 03 e8 00 05 b0 83 00 01 00 00 01 00 00 00 |................|Preview
MOV files cannot be shown in a browser. Download the file and open it in an application that reads MOV, such as QuickTime Player, iMovie and Final Cut Pro.
Where 20 MB matters
A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Microsoft Outlook | 20 MB of attachments by default for internet mail accounts | This file is right at the limit; add a second attachment and it is exceeded. |
| Gmail | 25 MB per message | Under the limit, although email encoding adds about a third in transit. |
| GitHub web uploads | 25 MiB per file added through the browser | Accepted. Pushing with Git allows larger files. |
| Cloudflare Pages assets | 25 MiB per file | The largest round size that can be served as a static asset. |
| Amazon API Gateway | 10 MB payload | Rejected; the upload has to go directly to object storage. |
| ASP.NET Core (Kestrel) | About 28.6 MB request body by default | Accepted with room for the multipart overhead. |
Use this file for
- Testing image resizing and memory use
- Verifying that an allow-list accepts video/quicktime
- Testing thumbnail and duration extraction
Testing notes for MOV
- Browser playback is uneven. Safari plays MOV; other browsers depend on the codec inside and on how the server labels the file. Convert to MP4 for anything shown on a web page.
- Phone footage stores its orientation as a rotation flag instead of rotating the pixels. A pipeline that ignores the flag produces sideways video.
Technical details
| File name | sample-mov-20mb.mov |
|---|---|
| Format | MOV (QuickTime movie) |
| Extension | .mov |
| MIME type | video/quicktime |
| Size | 20,971,520 bytes (20 MB) |
| Kind | Binary |
| Signature | 66 74 79 70 71 74 20 20 at offset 4 |
| SHA-256 | df989f75ad520b6a2d1c292ddd3865558ebc5b46b77dc5dfde5c144902a24cbd |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Not available for this file; details only |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Video |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-mov-20mb.mov # Linux
shasum -a 256 sample-mov-20mb.mov # macOSOn Windows, run Get-FileHash sample-mov-20mb.mov -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 20 MB?
- Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 20 MB MOV file?
- 11,186 frames (6 min 13 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one H.264 video track of a QuickTime movie. 517 bytes of a trailing "free" atom bring the file to the exact size.
- What is the difference between MOV and MP4?
- Very little in structure: MP4 was standardised from the QuickTime format. MOV allows more codecs and Apple-specific features, while MP4 is the version every browser and device is built to play.