How to Prevent Lightroom’s Previews File from Taking Over the Hard Drive

Adobe Lightroom ClassicVideo Tutorials

In this quick tip, I explain what makes Lightroom’s Preview file (.lrdata) grow and how to set your Catalog Settings to prevent it from getting out of hand.

(Although this video was recorded in a previous version of Lightroom, the concepts are still valid.)

Adobe Lightroom Classic, Video Tutorials

Posted on 08-05-2015


  • By Carol Parker - 9:31 AM on August 5, 2015  

    What happens to the size of the file if I set the file size to medium after the fact? Will the existing previews resize downwards or will it only apply to future previews?

    • By Julieanne Kost - 7:39 AM on August 16, 2015  

      It will only apply to future previews.

  • By Doug - 4:14 AM on August 7, 2015  

    I am now Lightroom CC 2015.1.1.
    The file name associated with my preview cache is Lightroom Catalog Previews .lrdata.

    My catalog preferences are standard preview size auto(1920px), preview quality medium, discard 1:1 after one week. Seems appropriate for my needs. It is 2 GB.

    When I looked in my file folder location I also have a very large Lightroom 5 Catalog Previews.lrdata file. 25GB. Is it still being used? If not, can I safely delete it?