In the Workspace, drop or pick a video, frame the area where subtitles appear, and press Start extraction. When it finishes, you can edit the text and timings in the result table, then download the SRT.

Common formats such as MP4, MOV, MKV, FLV and WebM. A few videos with unusual codecs may not be readable; convert them to a regular MP4 first.

It depends on your computer's performance and how dense the subtitles are — typically a fraction of the video's length. Stay on this page while it runs; switching tabs or closing it stops the extraction.

Not always. Auto-detection only guesses the subtitle position from a sample of frames; with tickers, watermarks, in-scene text or unusually laid-out subtitles it can frame the wrong spot, frame too small, or find nothing at all. Before starting, always scrub to a frame with subtitles and confirm yourself that the box fully covers the longest subtitle line (both ends included); if it doesn't, drag to adjust or draw it again.

Pick the side the subtitle text hugs inside the box: most videos are centered; choose left or right for subtitles that consistently sit on that side. A wrong choice can drop short lines that don't cross the centre axis.

Just large enough to cover where subtitles appear: too small and it clips characters; too large and other on-screen text (titles, watermarks) gets recognized along with the subtitles.

The most common causes are a box that doesn't cover the subtitles, subtitles that are too small, or too little contrast against the background. Enlarge the box, check the alignment, and scrub to a frame with subtitles before framing again.

Edit the text or times directly in the result table; re-recognize a single row with Re-recognize, or the whole video with Re-extract all. It's worth reviewing everything once before downloading.

A UTF-8 .srt subtitle file that you can load directly in a player or editor.

Yes. Drop several videos on the Batch page and they are processed one after another; the subtitle region can be auto-detected per video or reused from the workspace. When everything finishes you can download all SRTs at once. The batch list itself isn't kept after the tab closes, but finished results are saved to History.

Every finished extraction is saved automatically. You can search subtitle text or file names, file records into folders, export or import a subtitle library, and re-recognize the same video. Records live only in this browser and are removed when you clear browsing data.

No. The video, its frames and the recognized text are processed only on your device; nothing is sent to any server.