20 MB SRT sample
An SRT file of exactly 20,971,520 bytes. It is a valid SubRip subtitles file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy SRT file.
Download
sample-srt-20mb.srt
20 MB20,971,520 bytes
Download 20 MB SRTCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- application/x-subrip
- SHA-256
ec0e35efb65ee72b69ad65459321046fc2ff76af554c4ab2eb95ca7ae54a5e55- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
175,851 numbered subtitle cues, one every 686 ms and each shown for 617 ms, with up to three lines of text of at most 42 characters. The last cue repeats "End of sample" lines to bring the file to the exact size.
| Cues | 175,851 |
|---|---|
| Timing | HH:MM:SS,mmm |
| Line length | At most 42 characters |
| Formatting tags | None |
| Encoding | UTF-8 (ASCII characters only) |
| Line endings | LF |
How the file begins
The opening lines of sample-srt-20mb.srt, exactly as they appear in the file.
00000000 31 0a 30 30 3a 30 30 3a 30 30 2c 30 30 30 20 2d |1.00:00:00,000 -|
00000010 2d 3e 20 30 30 3a 30 30 3a 30 30 2c 36 31 37 0a |-> 00:00:00,617.|
00000020 45 76 65 72 79 20 6c 69 6e 65 20 69 6e 20 74 68 |Every line in th|
00000030 69 73 20 64 6f 63 75 6d 65 6e 74 20 77 61 73 20 |is document was |Preview
Creates the file in your browser and shows the first 64 KB of it.
Where 20 MB matters
A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Microsoft Outlook | 20 MB of attachments by default for internet mail accounts | This file is right at the limit; add a second attachment and it is exceeded. |
| Gmail | 25 MB per message | Under the limit, although email encoding adds about a third in transit. |
| GitHub web uploads | 25 MiB per file added through the browser | Accepted. Pushing with Git allows larger files. |
| Cloudflare Pages assets | 25 MiB per file | The largest round size that can be served as a static asset. |
| Amazon API Gateway | 10 MB payload | Rejected; the upload has to go directly to object storage. |
| ASP.NET Core (Kestrel) | About 28.6 MB request body by default | Accepted with room for the multipart overhead. |
Use this file for
- Finding the first upload limit in a new stack
- Testing caption editors and timing tools
- Testing subtitle upload and display
Testing notes for SRT
- SRT uses a comma before the milliseconds and WebVTT uses a full stop. Mixing them up is the usual reason a converted file fails.
- Files saved in a legacy encoding show garbled accents; importers should detect or require UTF-8.
Technical details
| File name | sample-srt-20mb.srt |
|---|---|
| Format | SRT (SubRip subtitles) |
| Extension | .srt |
| MIME type | application/x-subrip |
| Size | 20,971,520 bytes (20 MB) |
| Kind | Text |
| SHA-256 | ec0e35efb65ee72b69ad65459321046fc2ff76af554c4ab2eb95ca7ae54a5e55 |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Available on this page |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Subtitles |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-srt-20mb.srt # Linux
shasum -a 256 sample-srt-20mb.srt # macOSOn Windows, run Get-FileHash sample-srt-20mb.srt -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 20 MB?
- Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 20 MB SRT file?
- 175,851 numbered subtitle cues, one every 686 ms and each shown for 617 ms, with up to three lines of text of at most 42 characters. The last cue repeats "End of sample" lines to bring the file to the exact size.
- How long are the cues?
- Each cue lasts three seconds and a new cue starts every four seconds.