File Extension Database

Open SIG File

File extension SIG denotes a signature file, and are commonly used in conjunction with popular E-Mail clients such as Microsoft Outlook or QUALCOMM Eudora Pro. SIG files are also used by encryption programs such as Pretty Good Privacy (PGP), and are used to verify the origin of an E-Mail. Though less common, the SIG file extension is also a proprietary image format used by Broderbund graphics software.

The majority of SIG files are small, text files that are either embedded within an E-Mail, or sent as an attachment. They are typically used to store information that a user would wish to send with every E-Mail, such as name, E-Mail address or a favourite quote. E-Mails sent from businesses may also include the company name, address or job title of the sender. Most E-Mail clients can support multiple SIG files, allowing the user can specify which signature(s) to attach when composing an E-Mail.

SIG files are also used in conjunction with encryption software such as PGP. These applications generate a hash from the text of the E-Mail along with a digital signature from this hash using the sender's private key. This will then be typically attached to the E-Mail as a SIG attachment, or as plaintext at the bottom of the E-Mail. This signature can be used by the recipient with the same software and the sender's public key to verify that the E-Mail has not been altered since it was sent and that it actually came from the specified sender.

SIG signature files can be opened using appropriate E-Mail clients such as Microsoft Outlook, Outlook Express or QUALCOMM Eudora Pro. SIG files are also used by privacy and security software to check the integrity and origin of E-Mails, and so can be used by a recipient to confirm these details. SIG image files can be opened using appropriate versions of Broderbund software such as PrintMaster or The Print Shop.

How Can I Open SIG File on Windows

We researched and learned that the best way to open SIG file is to find a SIG file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a SIG file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open SIG file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as SIG file opener then try to search online for "SIG viewer", "application to open SIG file" or "open SIG file" queries in the search engine you like.
Install the application you found and check if it can open SIG file

How Can I Open SIG File on Mac OS

We recommend to find a SIG file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a SIG file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with SIG file.
If you know the Mac OS application which can work as SIG file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open SIG file in it.
If you don't know the application which can open SIG file then try to search for "SIG viewer", "application to open SIG file" or "read SIG file" queries in the online search engine you like.
Install the application you found and check if it can read SIG file

How Can I Open SIG File on Android

If you downloaded a SIG file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded SIG file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "SIG".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching for "SIG viewer", "SIG file reader" online and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

How to Open SIG File on iPhone or iPad

To open SIG File on iOS device follow steps below:

We advies to open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the SIG file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "SIG". This way you can find apps which can open SIG files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "SIG viewer" or "SIG file" online in your favorite search engine.