Subtitle files pair text with start and end times. SRT and WebVTT express those cues differently, but both can represent ordinary captions. A conversion tool is useful when the destination player expects one format and your editor has exported the other.
Choose the destination format
Use the format requested by the player or publishing system. An SRT file normally numbers its cues and uses a comma before milliseconds. WebVTT begins with a WEBVTT header and uses a period in its timestamps. Simply changing the file extension leaves these differences unresolved.
Choose your SRT or VTT file in the converter, select the output format, and process it. The tool writes new timestamps and the appropriate header or cue numbering. The download is a text file, so you can inspect it in a text editor before uploading it to the destination.
Adjust a consistent delay
If every subtitle appears two seconds too early, use an offset of +2 seconds to delay the cues. If every subtitle appears one and a half seconds too late, use -1.5 seconds to move them earlier.
Check a spoken phrase near the beginning, middle, and end of the recording. A constant offset only fixes a constant delay. If the mismatch grows over time, the subtitle timings may belong to a differently edited or differently paced version of the video. That needs a more detailed timing edit rather than one offset.
Know what happens near zero
A negative offset can move an early cue before the start of the recording. The converter clamps a remaining cue’s start time to zero and removes cues whose end time is also before zero. If no usable cues remain, it reports an error rather than downloading an empty subtitle file.
Each cue must end after it starts. Malformed timestamps and missing timing lines are reported. Keeping these checks visible is more useful than producing a file that fails silently in the destination player.
Review formatting and content
This is a basic text-cue converter. WebVTT styling, regions, positioning, and metadata are not retained, and inline tags are removed. If carefully placed captions or speaker styling matter to the video, use a subtitle editor that preserves those features.
The tool does not create captions from audio, translate the dialogue, or verify the transcript. Review spelling and timing yourself. Files are processed locally in your browser, with a two-megabyte limit for each subtitle file.