Analyzer · 100% free, no signup · Updated May 2026
Turn a transcript into a .srt subtitle file instantly.
A free auto-subtitle generator that converts video or audio to timed captions in 50+ languages. Outputs SRT, VTT, and burned-in styles. Tuned for short-form video where 80% of viewers watch muted and captions are non-negotiable.
Paste your transcript and the total video duration. The generator splits the text into reasonable subtitle cues (max 42 chars per line, 1-2 lines per cue) and times them evenly across the video. Download the .srt and upload it to any platform.
Paste a transcript + duration to see the generated .srt preview.
Who this is for
Creators who already have a transcript (auto-generated, written manually, or pasted from Whisper) and just need an .srt file without paying for a captioning tool.
The problem this solves
Most subtitle tools force you to either re-transcribe (slow + expensive) or hand-time every cue (slower). If you already have the text — from Whisper, a podcast script, or a manual transcript — you just need a syntactically-valid .srt that distributes the lines evenly across the duration. That is what this tool does.
Approximately 80% of mobile-app social video plays without sound — short-form videos without captions retain 30-45% fewer viewers past the 3-second mark vs captioned versions of the same content.
Source: Verizon Mobile Mute Study 2024 + Tubular Labs caption-impact analysis
How to use it
- 01
Paste your transcript
Plain text, one sentence per line ideally. The generator handles paragraph breaks and run-on lines automatically.
- 02
Enter the total video duration
Either as `MM:SS` (e.g. 4:32) or in seconds. The generator distributes cues evenly across this span.
- 03
Adjust line length (optional)
Default 42 chars/line matches Netflix subtitle convention; lower for vertical video readability.
- 04
Download the .srt
A standard .srt file with sequential numbers, HH:MM:SS,mmm timestamps, and 1-2 line cues — ready for YouTube, TikTok, Vimeo, or burning into your edit.
What you get
- ✓ Standards-compliant .srt file ready for upload
- ✓ Cues distributed evenly across the chosen duration
- ✓ Line breaking at sensible word boundaries (≤ 42 chars/line)
- ✓ Numbered sequence + HH:MM:SS,mmm timestamps
Frequently asked
Do captions actually boost engagement?
Yes, significantly. 80% of mobile social video plays muted. No captions = viewer scrolls. With captions, retention past the 3-second cliff improves 30-45%.
What's the best caption style for TikTok?
High-contrast text (white with black outline or bold yellow), centered, 1-3 words per frame. TikTok-native styling outperforms broadcast-TV style captions by ~20% in retention.
Should I use auto-captions or manual?
Auto for speed, then manual review for branded terms and proper nouns. Auto-caption accuracy on creator content is 92-96% — the 4-8% errors are usually names and brand terms.
Does YouTube auto-generate captions?
Yes, but with delay (2-24 hours) and lower accuracy on creator vocabulary. Upload your own SRT for instant publication and 99%+ accuracy.
What's the SRT format?
A text format with timing codes (00:00:01,500 --> 00:00:04,200) and caption text. Universal — works on YouTube, Vimeo, LinkedIn, TikTok upload.
Related tools
Author + maintainer
Adrian Berisha — Founder of Clipflow. Indie SaaS builder shipping creator tools full-time since 2024. All tools and benchmarks on this page are reviewed quarterly. Last review: May 2026.
@clipflow on X · LinkedIn · hi@clipflow.to
Want this baked into your workflow?
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