Aegisub – tool for creating and modifying subtitles

Aegisub is a free, open source cross-platform fully fledged, highly customizable tool for creating and modifying subtitles. This application makes it simple to time subtitles to audio, and features many powerful tools for styling them, including a built-in real-time video preview.

Aegisub features many convenient tools to help you with timing, typesetting, editing and translating subtitles, as well as a powerful scripting environment called Automation (originally mostly intended for creating karaoke effects, Automation can now be used much else, including creating macros and various other convenient tools).

Aegisub’s native subtitle format is Advanced SubStation Alpha text, which supports subtitle positioning and styling. The program also supports other common formats such as SubRip.

Aegisub is used for translating, timing, editing, typesetting, quality checking, karaoke timing and karaoke effecting.

Features include:

  • Simple and intuitive yet powerful interface for editing subtitles.
  • Support for many formats and character sets.
  • Powerful video mode.
  • Visual typesetting tools.
  • Intuitive and customizable audio timing mode.
  • Fully scriptable through the Automation module.

Developer: Niels Martin Hansen, Rodrigo Braz Monteiro
License: 3-clause BSD or ISC licenses


Aegisub is written in C++ and C#. Learn C++ with our recommended free books and free tutorials. Learn C# with our recommended free books and free tutorials.

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