200 KB MKV sample

An MKV file of exactly 204,800 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 200 KB sample, test or dummy MKV file.

sample-mkv-200kb.mkv

200 KB204,800 bytes

Download 200 KB MKV

Created in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.

Type: video/x-matroska
SHA-256: e19fe338778c0c2078205e6886fa81314eed7ad006b81430454abae383666bcb
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

107 frames (3.6 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. 1,422 bytes of an EBML Void element bring the file to the exact size.

Dimensions	640 × 360 px
Duration	3.6 s
Frame rate	30 fps
Video codec	H.264 (AVC), Main profile
Audio	No audio track
Document type	matroska
Clusters	4, 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-200kb.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  00 03 1f 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 200 KB matters

A 204,800-byte file: twice the default body limit of most API frameworks, and a common cap for photo and signature uploads on application forms. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Express body parsers	100 KB by default	Rejected with 413 unless the limit is raised.
Amazon DynamoDB items	400 KB per item	200 KB fits, even after base64 encoding takes it to about 273 KB.
Azure Service Bus, Standard tier	256 KB per message	Fits as raw bytes, but not once base64-encoded.

All 200 KB sample files

Use this file for

Checking email size handling
Checking transcoding and remuxing pipelines
Verifying type detection between MKV and WebM

Testing notes for MKV

A file with no Cues element still plays but cannot seek quickly. Recordings that were interrupted, and live captures, are often like this.
MKV and WebM share a signature. Detection has to read the document type inside the EBML header: "matroska" or "webm".

MKV format reference

Technical details

File name	sample-mkv-200kb.mkv
Format	MKV (Matroska video)
Extension	.mkv
MIME type	video/x-matroska
Size	204,800 bytes (200 KB)
Kind	Binary
Signature	1A 45 DF A3
SHA-256	e19fe338778c0c2078205e6886fa81314eed7ad006b81430454abae383666bcb
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-200kb.mkv     # Linux
shasum -a 256 sample-mkv-200kb.mkv # macOS

On Windows, run Get-FileHash sample-mkv-200kb.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 200 KB?: Yes. It is 204,800 bytes, which is 200 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 200 KB MKV file?: 107 frames (3.6 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. 1,422 bytes of an EBML Void element bring the file to the exact size.
Which media type should a server send for MKV?: Most software uses video/x-matroska. RFC 9559 registered video/matroska in 2024, and an allow-list should accept both.

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