100 MB MKV sample

An MKV file of exactly 104,857,600 bytes. It is a valid Matroska 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 100 MB sample, test or dummy MKV file.

sample-mkv-100mb.mkv

100 MB104,857,600 bytes

Download 100 MB MKV

Created in your browser and, in browsers that can stream to disk, sent straight to your downloads list; this can take a minute. No sign-up.

Type: video/x-matroska
SHA-256: 9a958954ff10c5a6a88d6143745258783405f9cd7aeb4f13b52e1461ac2a5ad2
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

55,800 frames (31 min 0 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one H.264 (AVC) video track. The index of key frames comes before the picture data, so a player can seek without reading the whole file. 1,371 bytes of an EBML Void element bring the file to the exact size.

Dimensions	640 × 360 px
Duration	31 min 0 s
Frame rate	30 fps
Video codec	H.264 (AVC), Main profile
Audio	No audio track
Document type	matroska
Clusters	1,860, one for each key frame
Seek index	Cues element before the first cluster

First bytes of the file

The first 64 bytes of sample-mkv-100mb.mkv as a hex dump: offset, bytes, then the same bytes as text. The MKV signature is 1A 45 DF A3.

00000000  1a 45 df a3 a3 42 86 81  01 42 f7 81 01 42 f2 81 |.E...B...B...B..|
00000010  04 42 f3 81 08 42 82 88  6d 61 74 72 6f 73 6b 61 |.B...B..matroska|
00000020  42 87 81 04 42 85 81 02  18 53 80 67 01 00 00 00 |B...B....S.g....|
00000030  06 3f ff cc 11 4d 9b 74  b3 4d bb 8e 53 ab 84 15 |.?...M.t.M..S...|

Preview

MKV files cannot be shown in a browser. Download the file and open it in an application that reads MKV, such as VLC and mpv.

Where 100 MB matters

A 104,857,600-byte file: the request-body limit of Cloudflare's Free and Pro plans, and the size above which GitHub rejects a file outright.

All 100 MB sample files

Use this file for

Testing image resizing and memory use
Verifying type detection between MKV and WebM
Testing media servers and players with a seekable file

Testing notes for MKV

Safari and Firefox do not play MKV, and Chrome does so only for some codecs. Remux to MP4 or WebM before showing video in a page.
A file with no Cues element still plays but cannot seek quickly. Recordings that were interrupted, and live captures, are often like this.

MKV format reference

Technical details

File name	sample-mkv-100mb.mkv
Format	MKV (Matroska video)
Extension	.mkv
MIME type	video/x-matroska
Size	104,857,600 bytes (100 MB)
Kind	Binary
Signature	1A 45 DF A3
SHA-256	9a958954ff10c5a6a88d6143745258783405f9cd7aeb4f13b52e1461ac2a5ad2
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-mkv-100mb.mkv     # Linux
shasum -a 256 sample-mkv-100mb.mkv # macOS

On Windows, run Get-FileHash sample-mkv-100mb.mkv -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 100 MB?: Yes. It is 104,857,600 bytes, which is 100 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 100 MB MKV file?: 55,800 frames (31 min 0 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one H.264 (AVC) video track. The index of key frames comes before the picture data, so a player can seek without reading the whole file. 1,371 bytes of an EBML Void element bring the file to the exact size.
Which codec do the MKV samples use?: H.264 video at 640 × 360 and 30 frames per second, with no audio track. The index of key frames is at the front of the file.

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