When subtitle lines drift out of sync or need careful positioning on screen, AegiSub lets you edit them alongside the video or audio. Its timeline, preview, and subtitle styling tools support timing and typesetting work in one editor.
Timing and video preview
AegiSub places subtitle lines in a timed editing view alongside the corresponding audio or video. The real-time preview shows how a line appears on screen, so timing, placement, and styling can be checked in context while editing.
For a track that is consistently early or late, the synchronization tools shift the whole subtitle track by a chosen amount. When only part of the dialogue is out of sync, individual sections can be adjusted separately.
Subtitle formats and styling
The editor works with ASS, SSA, SRT, SUB, and TXT files. It can also open subtitle tracks stored inside MKV, MKS, and MKA containers, allowing those tracks to be edited without first extracting them into a separate subtitle file.
Styling tools give control over the appearance and placement of captions. ASS and SSA projects are suited to formatted subtitles and visual typesetting, while the preview shows how the styling reads against the video.
How does the translation assistant organize dialogue?
The translation assistant presents original dialogue and translated text line by line. Keeping each translation beside its source caption makes it easier to track progress through a longer subtitle project and maintain the correspondence between lines.
Pros
- Opens ASS, SSA, SRT, SUB, and TXT subtitle files
- Edits subtitle tracks embedded in MKV, MKS, and MKA
- Provides line-by-line translation and real-time video preview
- Can shift a whole track or adjust sections separately
System requirements: Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11 · 64-bit only
Can AegiSub adjust only part of a subtitle track?
Yes. Sections can be synchronized separately when timing is wrong only for part of the dialogue.
Can it edit subtitles inside an MKV file?
Yes. AegiSub supports subtitle tracks stored in MKV, MKS, and MKA containers.
How does AegiSub support subtitle translation?
Its translation assistant displays the original and translated dialogue line by line.