1 MB VTT sample file
A VTT file of exactly 1,048,576 bytes. It is a valid WebVTT subtitles file, generated for this site and checked with an independent parser.
Download
sample-vtt-1mb.vtt
1 MB1,048,576 bytes
Download 1 MB VTTDirect download. No sign-up and no waiting.
- Type
- text/vtt
- SHA-256
efc6a790a1191f6b2ee00b9fcc6c519399e3539a7c35c3ae98fc7b636477662d- Direct URL
https://sampletestfiles.com/downloads/vtt/sample-vtt-1mb.vtt
What is in this file
The WEBVTT header and 8,940 cues with identifiers. A closing NOTE comment block brings the file to the exact size.
| Cues | 8,940 |
|---|---|
| Cue length | 3 seconds, one every 4 seconds |
| Running time | 09:56:00 |
| Encoding | UTF-8 (ASCII characters only) |
| Line endings | LF |
How the file begins
The opening lines of sample-vtt-1mb.vtt, exactly as they appear in the file.
WEBVTT
NOTE SampleTestFiles sample WebVTT file (1 MB)
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 first 64 KB of the file.
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
- Download tests on mobile connections
- Checking subtitle conversion
- Testing accessibility of video players
Testing notes for VTT
- Servers that send WebVTT as text/plain may see tracks ignored; the correct type is text/vtt.
- Browsers load caption tracks under the same cross-origin rules as scripts, so a .vtt file on another domain needs CORS headers.
Technical details
| File name | sample-vtt-1mb.vtt |
|---|---|
| Format | VTT (WebVTT subtitles) |
| Extension | .vtt |
| MIME type | text/vtt |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Text |
| Signature | 57 45 42 56 54 54 |
| SHA-256 | efc6a790a1191f6b2ee00b9fcc6c519399e3539a7c35c3ae98fc7b636477662d |
| 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-1mb.vtt 'https://sampletestfiles.com/downloads/vtt/sample-vtt-1mb.vtt'
sha256sum sample-vtt-1mb.vtt # Linux
shasum -a 256 sample-vtt-1mb.vtt # macOSOn Windows, run Get-FileHash sample-vtt-1mb.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 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 VTT file?
- The WEBVTT header and 8,940 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.