After every download, if you want
With auto-sync switched on, Sublarr checks fresh subtitles against the audio track and corrects the offset before you even notice.
Only the shift
ffsubsync measures, Sublarr shifts the original. Every line keeps its styling and length — signs, ED karaoke and long lines are not cut short.
History at your fingertips
Every sync attempt logged with engine, offset, and status. You see what worked — and can manually retry when it didn't.
When this matters
A release with a longer intro, a subtitle from another source, a TV rip that starts differently — wherever the whole subtitle is off by a few seconds. Sublarr measures the offset and corrects it. If a result would stretch the timeline or shift it implausibly far, the subtitle stays as it was: no sync beats a wrong one. One button re-runs the sync for a single subtitle by hand; alass can optionally align against an existing subtitle track, and the waveform editor handles the fine work.
Try it
Install Sublarr, scan your library once — the next episode syncs itself.