25 MB MP4 sample

An MP4 file of exactly 26,214,400 bytes. It is a valid MPEG-4 Part 14 video file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 25 MB sample, test or dummy MP4 file.

sample-mp4-25mb.mp4

25 MB26,214,400 bytes

Download 25 MB MP4

Created in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.

Type: video/mp4
SHA-256: 4a70aedcdb4d05dd942cd5a0b07f1b0c2c810247425fab62e55325b6b9029996
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

13,976 frames (7 min 46 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one H.264 video track. 1,461 bytes of a trailing "free" box bring the file to the exact size.

Dimensions	640 × 360 px
Duration	7 min 46 s
Frame rate	30 fps
Video codec	H.264 (AVC), Main profile
Audio	No audio track
Fast start	Yes (moov before mdat)

First bytes of the file

The first 64 bytes of sample-mp4-25mb.mp4 as a hex dump: offset, bytes, then the same bytes as text. The MP4 signature is 66 74 79 70 at offset 4.

00000000  00 00 00 20 66 74 79 70  69 73 6f 6d 00 00 02 00 |... ftypisom....|
00000010  69 73 6f 6d 69 73 6f 32  61 76 63 31 6d 70 34 31 |isomiso2avc1mp41|
00000020  00 00 eb 6f 6d 6f 6f 76  00 00 00 6c 6d 76 68 64 |...omoov...lmvhd|
00000030  00 00 00 00 e5 7b 69 80  e5 7b 69 80 00 00 03 e8 |.....{i..{i.....|

Preview

Creates the file in your browser and shows it here. Nothing large is downloaded from our server.

Where 25 MB matters

A 26,214,400-byte file, 25 MB in the binary units that operating systems and upload limits use. It is useful wherever a form, an API gateway, a storage quota or a mail server is configured with a limit of about this size.

All 25 MB sample files

Use this file for

Testing email attachment limits
Testing video upload, transcoding and thumbnail extraction
Checking HTML video playback and seeking

Testing notes for MP4

Seeking in a browser needs HTTP range requests. A server that ignores the Range header makes video appear to work until someone drags the progress bar.
A valid .mp4 may contain a codec the browser cannot play; container and codec are separate questions.

MP4 format reference

Technical details

File name	sample-mp4-25mb.mp4
Format	MP4 (MPEG-4 Part 14 video)
Extension	.mp4
MIME type	video/mp4
Size	26,214,400 bytes (25 MB)
Kind	Binary
Signature	66 74 79 70 at offset 4
SHA-256	4a70aedcdb4d05dd942cd5a0b07f1b0c2c810247425fab62e55325b6b9029996
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	Available on this page
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-mp4-25mb.mp4     # Linux
shasum -a 256 sample-mp4-25mb.mp4 # macOS

On Windows, run Get-FileHash sample-mp4-25mb.mp4 -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 25 MB?: Yes. It is 26,214,400 bytes, which is 25 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 25 MB MP4 file?: 13,976 frames (7 min 46 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one H.264 video track. 1,461 bytes of a trailing "free" box bring the file to the exact size.
Do the MP4 samples have sound?: No. They contain a single H.264 video track and no audio track.

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