The File Extensions Database

.SLM File Extension

  • Developer by: Morrison Software
  • Category: Encoded and encrypted Files

What is an .SLM file?

.SLM is Gallery Lock hidden media

The slm file extension is nowadays mainly related to Gallery Lock, an app for Android that allows users to hide photos and other pictures on their smartphones.

The slm file represents somewhat altered version of the original "hidden" picture which is located in a hidden folder on the SD card in the following location:


Basically, the 1024 bytes of data is added to the begging on the image (*.jpg in most cases) and the extension is renamed to slm.

How to open:

You can most likely recover these files only if you enable it using Gallary Lock.

How to convert:

No easy way how to convert SLM back to JPEG is not know to us.

How to solve problems with SLM files

  • Associate the SLM file extension with the correct application. On :
    Windows: Right click on any SLM file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.SLM files". Mac: Right click (or Ctrl-click) the SLM file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .SLM is Gallery Lock hidden media. Because only the current version supports the latest SLM file format. Search, therefore, e.g. on the Morrison Software manufacturer website after an available .SLM is Gallery Lock hidden media update.
  • To make sure that your SLM file is not corrupted or virus-infected, get the file again and scan it with antivirus software.