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SPECIFICTION
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Aegisub

aegisub.org

Free plan WindowsmacOSLinux
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Spec score 8.4 #8 of 31 in Subtitle Software

What it is

Aegisub is a free, open-source tool for creating and modifying subtitles on Linux, macOS, and Windows. Its audio interface includes waveform and spectrum views for timing subtitles, while video mode previews edits as they are made. Visual controls on the video frame let users position, rotate, scale, and clip subtitles. Aegisub imports and exports several subtitle formats, including MPEG-4 Timed Text and MicroDVD, and it supports subtitle translation. Editing aids include a translation assistant, spell checking, a thesaurus, syntax highlighting, and macros. The Automation module runs Lua scripts for macros and export filters. Multi-level undo and redo, autosaving, backups, and emergency recovery saving are included. Direct saving to SRT is blocked when override tags would lose information, though the Export dialog can export to SRT. Aegisub does not create DVD subtitles directly; its FAQ describes using an external program to convert SSA to VOBSubs. The optional update checker sends anonymous operating-environment details, including an IP address, and can be left disabled. Version 3.5.0 is listed for download.

Spec sheet

Purpose
Aegisub is a free, cross-platform open-source tool for creating and modifying subtitles.Read 7 Oct 2026 · aegisub.org
Free plan
YesRead 20 Sep 2026 · aegisub.org
Privacy
The optional update checker sends anonymous operating-environment information, including IP address, Aegisub version, operating system, and interface language; users can avoid this collection by not enabling the checker.Read 7 Oct 2026 · aegisub.org
Support
The FAQ recommends the Aegisub Discord server and IRC channel for Aegisub questions and the bug tracker for bug reports.Read 7 Oct 2026 · aegisub.org
Audio timing
It provides tools for timing subtitles to audio, including a customizable audio interface with waveform and spectrum views.Read 7 Oct 2026 · aegisub.org
Automation
The Automation module supports Lua scripts that provide macros and export filters.Read 7 Oct 2026 · aegisub.org
Current release
The downloads page lists version 3.5.0, released October 4, 2026, with Windows and OS X downloads and a source archive.Read 7 Oct 2026 · aegisub.org
Editing aids
Editing features include spell checking, a thesaurus, a translation assistant, syntax highlighting, and macros.Read 7 Oct 2026 · aegisub.org
Limit: DVD subtitles
Aegisub does not create DVD subtitles directly; its FAQ describes using an external program to convert SSA to VOBSubs.Read 7 Oct 2026 · aegisub.org
Limit: SRT export
Direct saving to SRT is blocked when override tags would cause information loss, though the FAQ describes exporting to SRT through the Export dialog.Read 7 Oct 2026 · aegisub.org
Recovery
Aegisub includes multi-level undo and redo, autosaving, backups, and emergency recovery saving.Read 7 Oct 2026 · aegisub.org
SRT export
YesRead 20 Sep 2026 · aegisub.org
Subtitle formats
It supports importing and exporting several subtitle formats, including MPEG-4 Timed Text and MicroDVD.Read 7 Oct 2026 · aegisub.org
Subtitle translation
YesRead 20 Sep 2026 · aegisub.org
Typesetting
Users can position, rotate, scale, and clip subtitles with visual tools on the video frame.Read 7 Oct 2026 · aegisub.org
Video preview
Its video mode provides a live preview of subtitles as they are edited.Read 7 Oct 2026 · aegisub.org
VTT export
NoRead 20 Sep 2026 · aegisub.org

Plans and prices

Aegisub Free Free, open-source subtitle editor Read 7 Oct 2026 · aegisub.org

Every Aegisub plan and price →

Strong points and limits

Strong points

  • Audio timing interface includes waveform and spectrum views.
  • Video mode previews subtitle edits.
  • Visual tools position, rotate, scale, and clip subtitles.
  • Lua scripts support macros and export filters.
  • Includes autosaving, backups, and emergency recovery saving.

Limits

  • Does not create DVD subtitles directly.
  • Direct SRT saving is blocked when tags would lose information.
  • Optional update checker sends an IP address.
  • VTT export is not supported.

Who it suits

Aegisub suits subtitle editors who need audio timing, video preview, visual typesetting, or Lua automation on Linux, macOS, or Windows. Its translation and editing aids may also suit people working with subtitle text across languages.

Verdict

Aegisub offers detailed timing, preview, typesetting, and automation controls in a free subtitle editor. Note its DVD subtitle limitation and the conditions on direct SRT saving.

Where Specifiction places it

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