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Aegisub is an advanced subtitle editor for Windows, and UNIX-like systems, such as Linux, Mac OS X and BSD. It is open source software and free for any use. Aegisub natively works with the Advanced SubStation Alpha format (aptly abbreviated ASS) which allows for many advanced effects in the subtitles, apart from just basic timed text. Aegisub's goal is to support using these advanced functions with ease.

Free software
Win Win Mac Mac

Version:3.2.0 History


Portable version

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  Latest version:
3.2.0 (July 28, 2014)

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Download Aegisub 3.2.0 (direct link) (18.6MB)

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Supported operating systems:
Windows Mac OS

Sections/Browse similar tools:
MacOS video toolsSubtitle

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Version history / Release notes / Changelog:
Aegisub 3.2.0 Changelog

Audio and Timing
Audio caching is now done in the background rather than popping up a modal progress dialog (#112)

The audio display is automatically scrolled to the active line when audio is first opened (if that option is enabled)

Drag all selected lines when Alt is held down when dragging in the audio display (#691)

Automation now uses LuaJIT in Lua 5.2 mode rather than Lua 5.1

Text controls are "infinite" length rather than limited to 30k bytes

subs.delete can be passed a table of row numbers to delete

Add the luabins and lfs libraries to the automation environment

Filter out redundant progress updates so that they don't make everything incredibly slow

Add support for submenus in the automation menu (insert / in the macro name) (#852)

Add unicode case conversion functions to the automation module (unicode.to_upper_case, unicode.to_lower_case, unicode.to_fold_case)

Only process selected lines in the Select Overlaps macro if more than one line is selected (#1751)

Add aegisub.project_properties() to get a table with stuff that used to be in the script info section of the file (but unlike the old script info entries, it's actually always up to date) (#1747)

Fix loading automation scripts when Aegisub is installed to a path with non-ascii characters in it (#1760)

Lua functions which take a path have been patched to support UTF-8 on Windows

Fonts Collector
Add a warning when a script using a bold or italic variant of a font that doesn't actually exist, as emboldening done by the renderer may not match what is seen in Aegisub

Make the installer translatable and use the language selected in the installer for Aegisub's UI language

Fix locale issues that could lead to find/replace stripping all non-ascii characters from a file (1587)

Use localized names for languages everywhere they're displayed rather than the English names

Fix a bunch of issues with RTL locales on Windows (but unfortunately there's still some major ones remaining) (#1354)

Improve HiDPI support

Add support for IMEs in the main edit box (#1247, #1672, #1695)

Fix crash when pasting emoji into the edit box

Use the OS spellchecker service rather than Hunspell.

Make fontconfig indexing about four times as fast

Significantly speed up passing subtitles to the subtitle renderer (as much as 10x faster), making the video display less laggy with large files

Speed up indexing Matroska files

Significantly speed up reading subtitles from Matroska files

Cut idle CPU usage when Aegisub is in the background by about 90%

Cut down the disk space used a bit

Resolution Resampler
Resample be and blur tags

Add support for converting between YCbCr matricies

Make the handling for AR-changing resampling a bit smarter

Use prettier string formatting for resampled numbers

Fix resampling drawings with AR changes

List the files which will be opened or closed in the Load/Unload files dialog

Support loading keyframes and timecodes files via drag-and-drop (#1749)

Subtitle editing
The edit box buttons (bold, italic, colors, etc.) try to do the right thing when multiple lines are selected, rather than just setting all of the lines to the active line's text

The subtitles grid has gained as Characters Per Second column, with customizable warning and error thresholds (#609)

Undo now restores the selected lines and cursor position that were active when the change being undone occured

Double-clicking on a word which is right next to a N no longer selects the N along with the word

Make default subtitle styles customizable: when creating a new file or importing from a format without style information, the styles from a catalog of your choice are automatically imported into the script (#962)

Add a button to open directly open the style editor for the current line's style (#1746)

Add Comment to the files which can be pasted over

Insert N on shift-enter in the edit box

Fix incorrect cursor positions when using non-BMP unicode characters

The edit box's background color is now customizable

Subtitle Formats
Fix crash when trying to open compressed tracks from Matroska

Add support for opening subtitle tracks with utterly insane CodecPrivate sections

Fix rounding error in the framerate calculations for CFR formats that sometimes lead to significantly wrong timestamps for long files

Add support for uncompressed RGB(A) files

Fix some of the issues with open-gop h264 files

Fix infinite loop when opening indexless matroska files (such as files written by x264 and not remuxed)

Fix some issues with interlaced h264

Add support for HEVC

Add option to resample the script rather than just changing the script resolution when opening a video with different resolution (1382)

Several of the tools have been somewhat restyled to make them less obstructive

Hide drag handles for commented lines

Don't automatically select all control handle in the vector clip tool when switching to it, as there's now box selection of handles

Update all selected lines when the origin is dragged in the rotate tools

View full changelog

Alternative to Aegisub:
DivXLand Media Subtitler
Sub Station Alpha
Subtitle Edit
Subtitle Workshop

Guides and How to's:
Subtitle timing guide - Read
View all guides with guide description here

Comments Post comment
5 comments, Showing 1 to 5 comments

You wrote on Aegisub "Alternative to DivXLand Subtitler" ... the biggest difference, for me at least, is that it can not include a subtitle over video ... DivXLand Subtitler can make ;)

Posted November 24, 2013 by . Tool version 3.0.4 using OS Windows 7 64-bit
Ease of use 7 of 10 Functionality 6 of 10 Value for money 10 of 10 Overall score 8 of 10

I've used this to subtitle 3 Japanese musicals. I found it very easy to use and exceptionally powerful. It is an advanced subbing tool. You can easily set it so you can see typical TV overscan and make sure your subs don't fall off the screen. Styles are great for creating a custom color/font and size to each speaker. Where songs are sung in several separate parts the subs can easily be located in different parts of the screen to make it clear who is singing what.

Yes it is slow to load the video and audio. But once loaded, timing is a snap. The audio waveform shows you visually exactly where dialogue starts and ends. You can easily move markers to fine-tune the timing. Though it would be nice if you could save in other formats, the format it uses, .ass (Advanced Substation Alpha) allows for a wide range of details that other formats would lose.

Posted October 23, 2011 by . Tool version 2.1.8 using OS WinXP
Ease of use 9 of 10 Functionality 9 of 10 Value for money 10 of 10 Overall score 9 of 10

This software is very complicated to use. And abvoe all, it is SLOW! Takes a lot of RAM and CPU and to open a video file takes forever, because the whole file is scanned through, just as if you would open it in Avidemux. It is scanned completely. This alone makes it virtually unusable. Especially if you want to sync several subtitles one after another. Then it is so annoying to wait each time for Aegis to scan the whole video file, not to mention that it doesn't open the sound of the video file by default. But the sound is needed to make the sync. And the sound also is scanned from start to end, which again takes ages. This software is so annoyingly slow, it's unbearable. So I stick to Subtitle Workshop until there's a better alternative, i.e. I hope that Subtitle Workshop gets updated for Unicode/UTF support.

Posted April 09, 2010 by . Tool version 2.18 using OS WinXP
Ease of use - of 10 Functionality - of 10 Value for money - of 10 Overall score 5 of 10

I recently downloaded a MKV file that used ASS format subtitles. ASS is short for Advanced SubStation(Alpha). The subtitles worked well but I wanted to convert to standard DVD Video and the subs were all wrong for that format in that they were overly large and the position was wrong. I was able to use Aegisub to fix the font size to a smaller size as well as adjust the position of the subs so that they weren't too low on the screen nor extended too far to either side. I am no expert when it comes to subtitles but I have some limited experience using Subtitle Workshop so in the end it didn't take me long to figure it all out and the HELP file included did help (although not much). However it worked without too much hardship on my part so all in all I am happy.

Posted July 22, 2007 by . Tool version v1.10 using OS WinXP
Ease of use 9 of 10 Functionality 9 of 10 Value for money 10 of 10 Overall score 9 of 10

A nice little app. Not too intuitive, but well documented so a novice will be up and running in no time. The keyboard shortcuts did not feel natural to me and I would have preferred to be able to save the output as *.srt as well, but apart from that it does the job, and it does it well!

Posted April 30, 2006 by . Tool version 1.09 using OS WinXP
Ease of use 8 of 10 Functionality 8 of 10 Value for money 10 of 10 Overall score 8 of 10

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