10 KB VTT sample file
A VTT file of exactly 10,240 bytes. It is a valid WebVTT subtitles file, generated for this site and checked with an independent parser.
Download
sample-vtt-10kb.vtt
10 KB10,240 bytes
Download 10 KB VTTDirect download. No sign-up and no waiting.
- Type
- text/vtt
- SHA-256
56de043221bce8cb40f77813e32c9135f50f85c197316ad81021fc9350d0d00e- Direct URL
https://sampletestfiles.com/downloads/vtt/sample-vtt-10kb.vtt
What is in this file
The WEBVTT header and 88 cues with identifiers. A closing NOTE comment block brings the file to the exact size.
| Cues | 88 |
|---|---|
| Cue length | 3 seconds, one every 4 seconds |
| Running time | 00:05:52 |
| Encoding | UTF-8 (ASCII characters only) |
| Line endings | LF |
How the file begins
The opening lines of sample-vtt-10kb.vtt, exactly as they appear in the file.
WEBVTT
NOTE SampleTestFiles sample WebVTT file (10 KB)
1
00:00:00.000 --> 00:00:03.000
This sample file exists so that software
can be tested with realistic input.
2
00:00:04.000 --> 00:00:07.000
Every line in this document was generated
by a script and describes nothing
confidential.Preview
Shows the file contents.
Where 10 KB matters
A 10,240-byte file that still arrives in the first round trip of a new connection. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| TCP initial congestion window | About 14.6 KB (10 segments) | A 10 KB response fits in the first flight of packets; the 25 KB sample does not. |
| nginx and Apache request headers | 8 KB per header line by default | Data this large must go in the request body. |
| webpack asset modules | 8 KB by default | Assets over the threshold are emitted as files instead of data URIs. |
Use this file for
- Checking thumbnail and icon handling
- Testing accessibility of video players
- Testing HTML video captions
Testing notes for VTT
- Browsers load caption tracks under the same cross-origin rules as scripts, so a .vtt file on another domain needs CORS headers.
- Servers that send WebVTT as text/plain may see tracks ignored; the correct type is text/vtt.
Technical details
| File name | sample-vtt-10kb.vtt |
|---|---|
| Format | VTT (WebVTT subtitles) |
| Extension | .vtt |
| MIME type | text/vtt |
| Size | 10,240 bytes (10 KB) |
| Kind | Text |
| Signature | 57 45 42 56 54 54 |
| SHA-256 | 56de043221bce8cb40f77813e32c9135f50f85c197316ad81021fc9350d0d00e |
| 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 | Subtitles |
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-vtt-10kb.vtt 'https://sampletestfiles.com/downloads/vtt/sample-vtt-10kb.vtt'
sha256sum sample-vtt-10kb.vtt # Linux
shasum -a 256 sample-vtt-10kb.vtt # macOSOn Windows, run Get-FileHash sample-vtt-10kb.vtt -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 10 KB?
- Yes. It is 10,240 bytes, which is 10 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 KB VTT file?
- The WEBVTT header and 88 cues with identifiers. A closing NOTE comment block brings the file to the exact size.
- Can I use these with the MP4 samples?
- Yes. Add the file with a <track> element to check that captions appear, though the text is unrelated to the picture.