Free SRT generator for English video and audio
Subtrims is free, English-only, and runs speech-to-text locally in your browser. No credit card needed.
What an SRT file is
SRT (SubRip) is one of the most widely supported subtitle formats. It is a plain-text file where each caption has a number, a start and end timecode, and the caption text, so it is an easy file to hand to an editor or keep alongside a video.
What the file looks like
Each caption in an SRT is a number, a start and end time (hours:minutes:seconds,milliseconds), the text, and a blank line. Here is a short illustrative example of 3-word captions where punctuation ends a caption early:
1
00:00:00,000 --> 00:00:01,200
YOU HAVE A STORY.
2
00:00:01,200 --> 00:00:02,600
MAKE EVERY WORD
3
00:00:02,600 --> 00:00:03,500
COUNT.
How to generate an SRT with Subtrims
- Open the generator and drop in a video or audio file.
- Choose 2, 3, 4 or 5 words per caption, and switch on ALL CAPS if you want it.
- Generate. The English speech is transcribed on your device and split into captions by word count, punctuation and pauses.
- Click any caption to correct the words.
- Download SRT with timecodes, or TXT with one caption per line and no timecodes.
SRT vs TXT
Choose SRT when you want captions that line up with your video in an editor. Choose TXT when you only need the words, for example for a script, a description or a blog post. SRT does not reliably carry font styles or colours, so do the styling in your editor.
Which files to upload
Try MP4, MOV, WebM, MP3, WAV, M4A or OGG. Decoding support depends on your browser and the media codec. If a video cannot be read, export its audio as WAV or MP3 and upload that instead. Short clips work best.
Tips for cleaner captions
- Record with a decent mic and keep music low under speech.
- One speaker at a time gives the most accurate transcript.
- Fix names, brands and slang in the caption list before you export.
- Start with 3 words per caption; go to 2 for very fast edits or 4–5 for slower talking-head videos.
- Use ALL CAPS for a bold short-form look, or leave it off for a calmer style.
Limits worth knowing
The free version handles English clips up to 5 minutes and 100 MB, with no credit card needed. There is no translation. The first run downloads the speech model, so it can take a few minutes; later runs reuse the cached model. Accuracy is best with clear speech: background noise, overlapping speakers, names and accents can cause mistakes, so skim the captions before exporting.
Privacy
Your media is decoded and transcribed locally on your device. The site does not upload or store your audio or video, which makes Subtrims a good fit for client footage or interviews you would rather keep off third-party servers.