Files with idx suffix may also be found along graphic subtitles as their indexes. Contains timings and other related information about the subtitles.

There are 6 other file types using
the IDX file extension!

empty icon.idx - Index file [common]

idx icon.idx - Microsoft Outlook Express mailbox index

empty icon.idx - Easy Timesheets data

idx icon.idx - Sunnysoft InterWrite data

empty icon.idx - NoX game data

empty icon.idx - Hellgate: London game archive

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IDX file extension - Subtitle index file

What is idx file? How to open idx files?

File type specification:

Various data file type icon Various data file type

File extension idx is also used for subtitle index files. These are typically found along actual (graphics) movie subtitles (.sub etc.) and act as metadata and index files. Usually contain timing, language, and bitmap information (colors) but not the subtitles.

Both the index and the associated subtitle file is needed for a successful playback of graphic SUB subtitles. Text based subtitles do not need these files at all.

The default software associated to open idx file:

VobSub icon

VobSub  Microsoft Windows software

Company or developer:

VobSub is popular plug-in used to view subtitles in various media players. It is also used by VirtualDub to rip subtitles from DVD VOB files.

Help how to open:

Some media players, such as VLC player allow importing of these .idx files. However, this will only work if you have the actual subtitles (usually .sub) that are linked in the .idx file.

How to convert:

You most likely cannot convert the indexes alone. You will also need the actual subtitles and convert both files together.

List of software applications associated to the .idx file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open idx file, edit idx file, convert idx file, view idx file, play idx file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting idx files.

Software that open idx file - Subtitle index file

Programs supporting the exension idx on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about VobSub for open idx file action.

Microsoft Windows:

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