Free SRT test files and sample generator
The most widely supported subtitle format: numbered cues with start and end timecodes and plain text. Generate valid .srt sample files of any size to test subtitle uploads, players, transcription pipelines and caption parsers.
What is a .srt file?
SRT: SubRip Subtitle. SubRip is the lowest-common-denominator subtitle format and the one almost everything accepts: a numbered list of cues, each with a start and end timecode and a line or two of text, and nothing else. Its simplicity is exactly why it survives. There is no header, no metadata and no styling model to disagree about, so a parser needs only to read timecodes and text.
Why generate a test SRT file?
- Test a subtitle upload field or a caption import.
- Exercise a media player, transcoder or transcription pipeline.
- Check what happens with overlapping, malformed or missing timecodes.
What you can put inside a .srt file
You get 3 content options for SRT, so the file holds something meaningful rather than random padding: Dialogue cues, Many short cues, Styled text (italic/bold). For SRT these are alternatives, so choose the one that matches what you need to test.
How a .srt file is identified
A .srt file has no signature at the start. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
Negative testing with broken SRT files
- Invalid. Identifiable, but wrong inside, so it fails during parsing.
- Corrupted. The leading bytes are destroyed. Same length as the valid file.
- Incomplete. Truncated part-way, so it is genuinely shorter.
- Empty. Chosen under Content rather than File Condition: valid structure, no data.
Which failure to reach for, and what to assert for each, is covered in how to make a corrupted file for testing. For upload limits and type checks see testing file upload validation, and for this format's encodings, UTF-16 and BOM test files.
Sample SRT content
1 00:00:00,000 --> 00:00:02,500 Software Test Data 2 00:00:02,500 --> 00:00:05,000 Cue 2 of the sample track
This shows the shape of the file. Your download is generated fresh at the size you choose, so the values will differ.
How to open and verify the file
Open it in any text editor to read it, or drop it beside a video of the same name and most players will load it automatically. VLC shows it under Subtitle → Sub Track, and `ffprobe file.srt` lists the cues.
Media type application/x-subrip · extension .srt · category Video
Generate a .srt file → · questions about sizes, privacy or cost are answered on the site FAQ.
Frequently asked questions about SRT files
What identifies a .srt file?
Nothing at the start of the file does. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
What can go inside the SRT file?
There are 3 content options for .srt: Dialogue cues, Many short cues, Styled text (italic/bold). For SRT these are alternatives, so pick the one matching what you need to test.
Can I download several broken SRT files at once?
Yes, select more than one File Condition and you get one ZIP containing a .srt per condition, each named after its condition.
Can the SRT file use UTF-16 or a byte-order mark?
Yes. .srt is a text format, so it can be generated as UTF-8, UTF-8 with a byte-order mark, UTF-16 LE or UTF-16 BE. The body is shortened before re-encoding so the finished file still lands on the exact size you asked for. Note that a UTF-16 file always has an even byte count.
How do I open or verify the SRT file?
Open it in any text editor to read it, or drop it beside a video of the same name and most players will load it automatically. VLC shows it under Subtitle → Sub Track, and ffprobe file.srt lists the cues.