1 MB WebM sample file
A WebM file of exactly 1,048,576 bytes. It is a valid WebM video file, generated for this site and checked with an independent parser. Use it wherever you need a 1 MB sample, test or dummy WebM file.
Download
sample-webm-1mb.webm
1 MB1,048,576 bytes
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- Type
- video/webm
- SHA-256
737d3c608ac7626c32e3d376c788647801f3a31395b734900ef4c50f8a28ecbd- Direct URL
https://www.sampletestfiles.com/downloads/webm/sample-webm-1mb.webm
What is in this file
814 frames (27.1 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. 686 bytes of an EBML Void element bring the file to the exact size.
| Dimensions | 640 × 360 px |
|---|---|
| Duration | 27.1 s |
| Frame rate | 30 fps |
| Video codec | VP9 |
| Audio | No audio track |
| Document type | webm |
| Clusters | 28, 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-1mb.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 0f ff 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 1 MB matters
A 1,048,576-byte file: exactly the default upload limit of nginx, Spring Boot and Next.js. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| nginx | 1 MB by default (client_max_body_size) | A multipart upload of this file exceeds the limit by the size of the form boundaries. |
| Spring Boot multipart | 1 MB per file by default (max-file-size) | A file of exactly 1 MB is at the limit. |
| Next.js API routes and Server Actions | 1 MB by default | Larger bodies need the size limit raised in configuration. |
| Cloud Firestore documents | 1 MiB (1,048,576 bytes) | The same number of bytes as this file. |
| Apache Kafka messages | About 1 MB by default | Brokers reject larger records unless message.max.bytes is raised. |
Use this file for
- Finding the first upload limit in a new stack
- Testing HTML video with a second source beside MP4
- Checking uploads of browser-recorded video
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-1mb.webm |
|---|---|
| Format | WebM (WebM video) |
| Extension | .webm |
| MIME type | video/webm |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Binary |
| Signature | 1A 45 DF A3 |
| SHA-256 | 737d3c608ac7626c32e3d376c788647801f3a31395b734900ef4c50f8a28ecbd |
| 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-1mb.webm 'https://www.sampletestfiles.com/downloads/webm/sample-webm-1mb.webm'
sha256sum sample-webm-1mb.webm # Linux
shasum -a 256 sample-webm-1mb.webm # macOSOn Windows, run Get-FileHash sample-webm-1mb.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 1 MB?
- Yes. It is 1,048,576 bytes, which is 1 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 MB WebM file?
- 814 frames (27.1 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. 686 bytes of an EBML Void element bring the file to the exact size.
- Which codec do the WebM samples use?
- VP9 video at 640 × 360 and 30 frames per second, with no audio track.