500 KB WebM sample file

A WebM file of exactly 512,000 bytes. It is a valid WebM video file, generated for this site and checked with an independent parser. Use it wherever you need a 500 KB sample, test or dummy WebM file.

sample-webm-500kb.webm

500 KB512,000 bytes

Download 500 KB WebM

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Type: video/webm
SHA-256: 1dda9d6d0ebdf8f80b7ef465ff9a5eca15e487947a647369e32ffeff2882f22a
Direct URL: https://www.sampletestfiles.com/downloads/webm/sample-webm-500kb.webm

What is in this file

395 frames (13.2 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. 99 bytes of an EBML Void element bring the file to the exact size.

Dimensions	640 × 360 px
Duration	13.2 s
Frame rate	30 fps
Video codec	VP9
Audio	No audio track
Document type	webm
Clusters	14, 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-500kb.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 07 cf d0  |B....S.g........|
00000030  15 49 a9 66 cc 2a d7 b1 83 0f 42 40 4d 80 8f 53  |.I.f.*....B@M..S|

Preview

Displays the file in your browser.

Where 500 KB matters

A 512,000-byte file: larger than most API body limits, smaller than most upload limits. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Amazon DynamoDB items	400 KB per item	500 KB cannot be stored as a single item.
Express body parsers	100 KB by default	Rejected unless the limit is raised.
nginx request body	1 MB by default (client_max_body_size)	Accepted with room to spare.

All 500 KB sample files

Use this file for

Typical image-upload tests
Testing transcoding from WebM to MP4
Testing HTML video with a second source beside MP4

Testing notes for WebM

WebM and MKV share a signature, so a sniffer has to read the document type to tell them apart.
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.

WebM format reference

Technical details

File name	sample-webm-500kb.webm
Format	WebM (WebM video)
Extension	.webm
MIME type	video/webm
Size	512,000 bytes (500 KB)
Kind	Binary
Signature	1A 45 DF A3
SHA-256	1dda9d6d0ebdf8f80b7ef465ff9a5eca15e487947a647369e32ffeff2882f22a
Created	2026-10-10
Validation	Exact size, signature bytes and structure checked when the file was generated
Preview	Available on this page
Source	Generated for this site; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Video

Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-webm-500kb.webm 'https://www.sampletestfiles.com/downloads/webm/sample-webm-500kb.webm'
sha256sum sample-webm-500kb.webm     # Linux
shasum -a 256 sample-webm-500kb.webm # macOS

On Windows, run Get-FileHash sample-webm-500kb.webm -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

Related files

Questions about this file

Is this file exactly 500 KB?: Yes. It is 512,000 bytes, which is 500 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 500 KB WebM file?: 395 frames (13.2 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. 99 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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