Sync Subtitles

Why are my subtitles out of sync?

Subtitle sync issues are one of the most common problems when watching films and television with captions. They happen for a variety of reasons. If you downloaded subtitles from a different source than the video, the subtitle file may have been authored for a different release — one with a longer intro sequence, different frame rate, or trimmed credits. Even a difference of a few hundred milliseconds is enough for dialogue to feel noticeably off.

Frame rate mismatches are another frequent cause. A subtitle file timed for a 25 fps PAL version of a film will drift steadily when played alongside a 23.976 fps NTSC copy. Streaming services sometimes re-encode content in ways that shift the starting point of the video, leaving perfectly good subtitle files a second or two behind. Blu-ray rips, DVD conversions, and broadcast recordings all introduce their own small timing offsets.

How subtitle timing adjustment works

This tool applies a uniform time shift to every timestamp in your subtitle file. Each subtitle entry has a start time and an end time — typically in the format 00:00:00,000 for SRT files or 00:00:00.000 for WebVTT. When you enter a positive offset, the tool adds that many milliseconds to every timestamp, making subtitles appear later. A negative offset subtracts time, making them appear earlier.

The adjustment is applied to both start and end times equally, so the duration of each subtitle remains unchanged. If a shift would push a timestamp below zero, the tool clamps it to 00:00:00,000 — no negative timestamps are produced.

A uniform shift works well when subtitles are consistently early or late throughout the entire file. If the drift grows over time — starting in sync but gradually worsening — that usually indicates a frame rate mismatch, which requires a different kind of correction. For simple fixed-offset problems, however, this tool handles SRT and VTT files quickly and entirely within your browser. No files are uploaded to any server.