100 KB WebM sample file
A WebM file of exactly 102,400 bytes. It is a valid WebM video file, generated for this site and checked with an independent parser. Use it wherever you need a 100 KB sample, test or dummy WebM file.
Download
sample-webm-100kb.webm
100 KB102,400 bytes
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- Type
- video/webm
- SHA-256
9a8d05d1acc5cd569a49e8b777c5f365a03d9fd03d740817114b79436ab511c6- Direct URL
https://www.sampletestfiles.com/downloads/webm/sample-webm-100kb.webm
What is in this file
80 frames (2.7 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. 2,224 bytes of an EBML Void element bring the file to the exact size.
| Dimensions | 640 × 360 px |
|---|---|
| Duration | 2.7 s |
| Frame rate | 30 fps |
| Video codec | VP9 |
| Audio | No audio track |
| Document type | webm |
| Clusters | 3, 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-100kb.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 01 8f 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 100 KB matters
A 102,400-byte file that sits exactly on the default request-body limit of Express. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Express body parsers | 100 KB (102,400 bytes) by default | A request body of exactly this size passes; anything larger returns 413 Payload Too Large. |
| Gmail message clipping | About 102 KB of HTML | Longer messages are truncated behind a "view entire message" link. |
| Amazon DynamoDB items | 400 KB per item | 100 KB fits; the 500 KB sample does not. |
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.
Technical details
| File name | sample-webm-100kb.webm |
|---|---|
| Format | WebM (WebM video) |
| Extension | .webm |
| MIME type | video/webm |
| Size | 102,400 bytes (100 KB) |
| Kind | Binary |
| Signature | 1A 45 DF A3 |
| SHA-256 | 9a8d05d1acc5cd569a49e8b777c5f365a03d9fd03d740817114b79436ab511c6 |
| 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-100kb.webm 'https://www.sampletestfiles.com/downloads/webm/sample-webm-100kb.webm'
sha256sum sample-webm-100kb.webm # Linux
shasum -a 256 sample-webm-100kb.webm # macOSOn Windows, run Get-FileHash sample-webm-100kb.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 100 KB?
- Yes. It is 102,400 bytes, which is 100 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 100 KB WebM file?
- 80 frames (2.7 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. 2,224 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.