Lightroom mobile fills storage because it keeps a local cache of smart previews and, often, full-resolution originals it has downloaded for editing. To clear it, open Lightroom, go to Settings (the gear) > Local Storage (or Cloud and Local Storage), and tap Clear Cache. Because your photos and edits are synced to Adobe's cloud, clearing the local cache frees space without losing any of your work.

TL;DR

  • Lightroom mobile stores smart previews and locally downloaded originals; that local cache is what fills your phone.
  • Clear it in-app: Settings > Local Storage > Clear Cache — your synced photos and edits stay safe in the cloud.
  • Disable Store Originals Locally to stop Lightroom re-downloading full files onto your device.
  • iPhone: after clearing in-app, Settings > General > iPhone Storage > Lightroom > Offload App reclaims any remainder.
  • This only works because your library is synced — confirm sync is complete before clearing, especially for photos imported only on this device.

What is Lightroom mobile storing locally?

Lightroom is a cloud-first app, but to edit smoothly it keeps copies on your device. Smart previews are compressed, edit-ready versions of your photos. If you enabled Store Originals Locally, it also keeps full-resolution RAW or JPEG files, which are large. Together these make up the local cache that grows over time as you browse and edit more of your library.

The important part: these local files are copies. The authoritative versions of your photos and every edit you have made live in Adobe Creative Cloud, so clearing the local copies does not destroy your work as long as sync is current.

How do I clear the Lightroom cache on iPhone?

Do it inside the app, because iOS cannot reach Lightroom's managed cache directly. Open Lightroom, tap the gear icon for Settings, open Local Storage (labeled Cloud and Local Storage on some versions), and tap Clear Cache. Lightroom shows how much space the cache uses and frees it immediately. Your photos remain in the cloud and reappear as previews when you next browse them.

If the app still holds space afterward, finish with Settings > General > iPhone Storage > Lightroom > Offload App. Offloading removes the app binary while keeping its data and your sign-in, and it reinstalls in a tap.

How do I clear the Lightroom cache on Android?

Use the in-app path first: Settings (gear) > Local Storage > Clear Cache, exactly as on iPhone. This is the correct way to clear smart previews and downloaded originals while keeping your synced library intact.

You can also use the system path Settings > Apps > Lightroom > Storage > Clear cache for the OS-level temporary files. Do not use Clear storage on that screen unless you want to sign out and reset the app — with sync complete it is recoverable, but it forces a full re-download.

How do I stop Lightroom from filling storage again?

The cache rebuilds if Lightroom keeps downloading full files. In Settings > Local Storage, turn off Store Originals Locally (or set it so originals are only kept for albums you are actively editing). With that off, Lightroom keeps lightweight smart previews and pulls full resolution only when you actually open a photo. That single switch is usually the difference between an app that stays a few hundred megabytes and one that creeps toward several gigabytes.

What Lightroom and iOS do natively, and where they stop

Lightroom manages its own cache and will evict older local files when space runs low, and iOS can Offload the app to reclaim its binary. Both keep the temporary layer in check. Where they stop is the originals you chose to store locally and any photos that exist only on this device and have not finished syncing — neither the app nor iOS will risk removing those automatically, because they could be the only copy.

What clearing the cache cannot do

Clearing the cache cannot recover a photo that was imported on this device and never synced to the cloud, so check that uploads are finished first. It also does not change your Store Originals Locally setting, so the cache will refill if that switch stays on. None of this touches your edits — those are stored as non-destructive instructions in the cloud — but a photo that only ever lived locally is gone if you clear it before it syncs. Confirm sync, then clear.

If your Camera Roll is the bigger storage problem, how to find and delete large videos on iPhone without deleting photos and iphone storage full but nothing to delete: what's actually using it are good next reads.

FAQ

Will clearing Lightroom's cache delete my edits?

No. Your edits are stored as non-destructive metadata synced to Adobe Creative Cloud, not in the local cache. Clearing the cache removes only local previews and downloaded originals; your edited photos reappear from the cloud, fully intact, when you browse them again.

What is the difference between smart previews and originals in Lightroom?

Smart previews are small, compressed, edit-ready copies that let you work without the full file present. Originals are the full-resolution RAW or JPEG files. Keeping originals local is what consumes the most space, so turning off Store Originals Locally is the most effective way to keep Lightroom small.

Is it safe to clear the cache before everything has synced?

No. If a photo was imported only on your device and has not finished uploading, clearing the cache can delete the only copy. Wait until the sync indicator shows uploads are complete, then clear the cache safely.

For the whole-phone view of where your gigabytes go, Cleanor for iPhone surfaces the heavy apps and media weighing your device down so you can free up iPhone space with confidence.