Opening SUB Files

The SUB file type is primarily associated with VobSub.

SUBFile Extension SUB
 File extension: SUB
File type:  subtitle file

What is a SUB file?

SUB files mostly belong to VobSub. SUB files mainly serve as subtitle containers used in video playback. They store the visual data for subtitles that are often rendered as images rather than plain text.

  • Video Subtitles: Most SUB files come from the VobSub format. They work with accompanying files (like .IDX) to display subtitles synchronized with the video.
  • CD Image Subtitles: In some cases, SUB files are used to store image data from CD images, where the subtitle information is embedded as graphic data.
  • Game Graphics: A smaller share of SUB files, such as those from Metin2, contain parts of game textures or sprites.

For further details, you can visit the VobSub website.
FilExt.com note: To view these files, open them with compatible media players (such as VLC with the correct plugins) or subtitle display programs that support image-based overlays.

How can I open a SUB file?

You need a suitable software like VobSub to open a SUB file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your SUB file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a SUB file directly in the browser:. Just drag the file onto this browser window and drop it.

Online SUB Text Viewer

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Programs that open and convert SUB files:

  1. VobSub
    See the previous paragraphs to learn more about the main application. SUB files are often referred to as VobSub videos because this type of file is primarily created or used by this software.
  2. CaSat Suite (Subtitling file) by SoftNI Corporation
    SoftNI CaSat Suite is a multi-channel, multi-platform, modular subtitling solution for multilingual cable/satellite transmissions, providing subtitles in most European, Asian, African, and Middle Eastern languages.
  3. CloneCD (Sub Channel Data) by SlySoft Inc.
    Sub channel data of all tracks of the CD. It is used in conjunction with the .CCD and .IMG files of the same rootname. Related links: CloneCD Info Site
  4. DivX (Subtitles) by DivXNetworks, Inc.
  5. Insight II (Subset Definition File) by Accelrys Software Inc.
    Insight II is a molecular modeling environment that provides a graphical interface to algorithms for molecular dynamics, homology modeling, de novo design, and electrostatics.
  6. Rational Rose (Component Package) by IBM
    Model-driven development tool.
  7. SubmitWolf File
    (search engine submission program)
  8. SubTerra (Level File) by Crystal Shard
    This file format is classified as Game.

SUB file extension format:

Why is it important to know the file format? This is the only way to find out which program to use to open the file. The initial characters of a file are called signature, sometimes also referred to as "magic bytes". The signature can be used to infer the file format. File extension, signature and file format must match; otherwise errors will occur when the file is opened. So you need a detailed analysis of a file to find out the format and the associated program. Below is our analysis of the SUB files:

SUB is not that commonly used as a file extension. This file type covers different formats for different programs. The following file formats are most commonly found in SUB files:

The remaining 35% of all SUB files are files with no common format, often, for example, SubViewer 2. Often described as dead, subtitles or series. If you want to find out what your SUB file contains, drag and drop it onto this page.

Technical Data for SUB File Extension

File classification:
Video
Related files:
idx, srt, ass, ssa, sup, vtt, subtitle, subs, dvdrip, asy, avi, ccd, jrp, zip, webp, stl
Mime type:
image/vnd.dvb.subtitle, application/octet-stream, text/plain

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: AvantGo.subFile, FileType: AvantGoChannel, AppName: AGSUBS.EXE
EXEFile: agsubs.exe
ProgramID: trls20.Document, FileType: Total Recall Subject File, AppName: trls22
ProgramID: AvantGo.subFile
EXEFile: %ProgramFiles%\AvantGo Connect\AvantGo\agsubs.exe /dde
ProgramID: AvantGo.subFile
EXEFile: %ProgramFiles%\AvantGo\agsubs.exe /dde
ProgramID: SubFile
EXEFile: notepad.exe %1
ProgramID: Rose.SubFileType
EXEFile: %ProgramFiles%\Rational\Rose\rose.exe %1
ProgramID: SubTerra
EXEFile: %ProgramFiles%\SubTerra\SubTerra.exe %1
ProgramID: AvantGo.subFile
EXEFile: %ProgramFiles%r\AvantGo Connect\AvantGo\agsubs.exe
ProgramID: SubFile
EXEFile: %ProgramFiles%\K-Lite Codec Pack\Media Player Classic\mplayerc.exe
ProgramID: ALShow.SUB
EXEFile: %ProgramFiles%\ESTsoft\ALShow\ALShow.exe
Show all 10 listingsTo Top

a sub subtitle file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with SUB files

  • Associate the SUB file extension with the correct application.
  • Update your software that should actually open subtitle files. Because only the current version supports the latest SUB file format. Search, therefore, e.g. on the manufacturer website after an available VobSub update.
  • To make sure that your SUB file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
  • Click here to open your .SUB file online - secure, fast, and no downloads needed.
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