Free subtitle tools: convert, repair and sync
Start with the caption file you already have. These tools work with text and timestamps; they do not transcribe audio or generate captions from a video.
Choose your tool
SRT validator and repair tool
Check subtitle structure and repair numbering, spacing, and timestamp arrows locally.
Open toolSRT and VTT subtitle converter
Convert subtitle text between SRT and WebVTT formats in the browser.
Open toolSubtitle time shifter
Move every subtitle cue forward or backward while preventing negative timestamps.
Open toolSubtitle reading-speed checker
Flag caption cues that are too fast or too dense for comfortable reading.
Open toolSubtitle plain-text extractor
Remove cue numbers and timestamps to produce clean transcript text locally.
Open toolA useful order of work
Check the file
If an editor rejects your subtitles, validate the structure first. Review each warning before accepting a repair, especially overlapping or reversed timestamps.
Choose the output
Use SRT for a workflow that requests SubRip captions, VTT for a WebVTT workflow, or plain text for a transcript. Conversion can discard formatting that the other format cannot represent.
Check timing and readability
Apply a constant offset when every cue is early or late. Check reading speed, then preview the result with the actual video before publishing.