200 KB WebM sample

A WebM file of exactly 204,800 bytes. It is a valid WebM 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 WebM file.

sample-webm-200kb.webm

200 KB204,800 bytes

Download 200 KB WebM

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/webm
SHA-256: be959a6b86a320818b6f4509253289d512ab642a55ffbd0c98143bba2b197998
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

154 frames (5.1 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one VP9 video track. The index of key frames comes before the picture data, so a player can seek without reading the whole file. 121 bytes of an EBML Void element bring the file to the exact size.

Dimensions	640 × 360 px
Duration	5.1 s
Frame rate	30 fps
Video codec	VP9
Audio	No audio track
Document type	webm
Clusters	6, one for each key frame
Seek index	Cues element before the first cluster

First bytes of the file

The first 64 bytes of sample-webm-200kb.webm as a hex dump: offset, bytes, then the same bytes as text. The WebM signature is 1A 45 DF A3.

00000000  1a 45 df a3 9f 42 86 81  01 42 f7 81 01 42 f2 81 |.E...B...B...B..|
00000010  04 42 f3 81 08 42 82 84  77 65 62 6d 42 87 81 04 |.B...B..webmB...|
00000020  42 85 81 02 18 53 80 67  01 00 00 00 00 03 1f d0 |B....S.g........|
00000030  11 4d 9b 74 b3 4d bb 8e  53 ab 84 15 49 a9 66 53 |.M.t.M..S...I.fS|

Preview

Creates the file in your browser and shows it here.

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 uploads of browser-recorded video
Verifying type detection between WebM and MKV

Testing notes for WebM

H.264 and AAC are not allowed in WebM. A file with those codecs and a .webm extension is really Matroska, and browsers may refuse it.
Recordings made in the browser usually lack a duration and an index, because both are only known when recording stops. Players show no length and cannot seek until the file is remuxed.

WebM format reference

Technical details

File name	sample-webm-200kb.webm
Format	WebM (WebM video)
Extension	.webm
MIME type	video/webm
Size	204,800 bytes (200 KB)
Kind	Binary
Signature	1A 45 DF A3
SHA-256	be959a6b86a320818b6f4509253289d512ab642a55ffbd0c98143bba2b197998
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-webm-200kb.webm     # Linux
shasum -a 256 sample-webm-200kb.webm # macOS

On Windows, run Get-FileHash sample-webm-200kb.webm -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 WebM file?: 154 frames (5.1 s) of a synthetic test pattern with a frame counter, looping every six seconds, in one VP9 video track. The index of key frames comes before the picture data, so a player can seek without reading the whole file. 121 bytes of an EBML Void element bring the file to the exact size.
Can the WebM samples be seeked?: Yes. They declare their duration and carry an index of key frames ahead of the picture data, unlike a raw browser recording.

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