Is it safe to delete Lightroom Classic previews?

Thumbnails and previews that Lightroom Classic renders so it can show your photos quickly.

Usually safe

It can be recreated, but it takes a download, a reinstall or the tool's own command.

~/Pictures/Lightroom/* Previews.lrdata

Only next to *.lrcat
Never inside ~/Pictures/Lightroom/* Smart Previews.lrdata

What it is

Lightroom Classic keeps a preview file next to each catalog, in the Pictures/Lightroom folder by default. It holds the thumbnails and larger previews you see as you browse, and 1:1 previews can make it very large. Lightroom Classic rebuilds previews as you browse, but it needs the original photos to do so. Smart Previews are kept in a separate file and aren't part of this item.

If it's removed

Folders open more slowly while Lightroom Classic rebuilds previews. Photos whose originals are on a disconnected drive can't show previews until the drive is connected again.

How it's removed

Moved to the Trash, where you can restore it. Quit Adobe Lightroom Classic first.

PRO

The free analyzer finds it and explains it. Removing it is Pro, after a review sheet that lists every move and command. It's never checked for you: it waits for your choice.

Sources

Last checked on 26 Sep 2026. Every entry is written and checked by hand; the app and the command-line tool use the same words.