Media Doctor · Free tool
Subtitles too early, too late or slowly drifting away from the audio? Shift every line, sync by two points or change the frame rate, then download a fixed SRT or WebVTT file. Nothing is uploaded.
Runs in your browser. Subtitle text stays on this device, and the synced file is created locally.
Windows apps from SteveShines
Transcribe the audio of your own recording, or edit the video and captions together, on your PC.
Offline transcription for audio and video.
Cut video, remove silence and add captions.
Video downloader and local media toolkit.
Play the video and pause on a clearly spoken line. Compare when the line is heard with when its subtitle appears. If the subtitle appears 2 seconds after the voice, shift by -2; if it appears 2 seconds before, shift by 2. Times can also be entered as 1:02.5 or 00:01:02,500.
Need to check a file for broken timestamps, overlaps or encoding problems first? Use the Subtitle Checker.
Load the SRT or VTT file, keep “Every line is early or late by the same amount” selected and enter the difference in seconds. Use a minus sign, such as -2.5, when the subtitles appear too late and must show earlier; use a positive number when they appear too early.
The subtitles were usually timed for a different frame rate or a slightly different cut of the video, so the error grows with every minute. Use “Sync by first and last line”: enter when the first and the last spoken line really start, and every line in between is stretched to match.
A common case is subtitles made for a 23.976 fps release played with a 25 fps European (PAL) version, which runs about 4% faster. If the drift is roughly 2.4 seconds per minute, try 23.976 → 25 fps; if the subtitles fall behind instead, try 25 → 23.976 fps.
No. The file is read and retimed in your browser, and the synced file is created on your device. SteveShines does not receive your subtitle text.
Yes. Choose SRT or WebVTT as the output format. The list of changes shows anything the target format cannot store, such as WebVTT positioning.
Lines that would end before 00:00:00 are removed, and lines that would start before it begin at 00:00:00 instead. Both changes are listed before you download.
No. The Subtitle Shifter reads SRT and WebVTT. Convert other formats to SRT in a subtitle editor first.