Words to minutes
Estimate narration duration from your script and adjustable speaking rates.
Free · local text processing
Free video workflow tools
Small tasks, finished in your browser. No sign-up, credits or model calls. Your script and subtitles are not uploaded by these tools.
SRT ↔ VTT converter
Convert plain-text subtitle files while keeping millisecond timing and multiple lines.
Free · local text processing
Subtitle time shifter
Move every cue earlier or later by an exact offset. Preview before downloading.
Free · local text processing
Subtitle reading speed checker
Locate overlaps, ordering problems, long lines and fast captions using your own thresholds.
Free · local text processing
Your files stay yours
Open UTF-8 text up to 1 MiB. Subtitle tools accept up to 5,000 plain-text cues and timestamps up to 24 hours. Unsupported formatting is reported instead of silently removed. Results can be previewed and downloaded before any account is needed.
These tools do not transcribe audio, align words or create video. Review your results in the intended player before publishing.