Use the timeline you need
Paste subtitles or choose a file, then run the check. Invalid timestamps or reversed ranges block download. For text that parses, inspect warnings about overlap, ordering and discarded formatting. Add the video's total duration to find cues that end beyond it. This is a practical plain-text timing check, not certification for every player.
Know what is preserved
The output keeps plain text and millisecond timing. Fonts, positions, cue identifiers, styles and animations are not preserved. File processing stays in this browser, with a 2 MB combined input limit and up to 10,000 cues. Opening a video project uses the separate cloud workflow.
Put the checked result on a video
Download the SRT or VTT for another player, or continue to the video editor with the current subtitle result. Choose your video, check the beginning and end, adjust the style and render an MP4. Imported files must fit the video's duration. Video export follows the current account and plan limits.