Browser storage limits
How the Chrome extension uses local storage, warnings when space is low, and how to free space without losing cloud data.
The ZetaMarker extension stores highlights and page metadata locally in Chrome so you can work offline. Chrome imposes storage quotas per extension.
What uses local storage
- Highlight text and positions per page
- Page list cache for the sidebar
- Pending sync queue when offline
Cloud copy at app.zetamarker.com is separate — signing in backs up data to the server.
Storage warnings
When local storage is nearly full, the extension may show:
- Storage almost full
- Storage full. Your last change could not be saved.
Actions offered:
- Manage storage — open storage management
- Dismiss — dismiss the warning temporarily
Free local space
- Delete pages you no longer need (syncs to cloud trash if signed in).
- Remove old highlights from heavy pages.
- Sign in and sync so cloud is authoritative — then clear local-only duplicates if prompted.
Permanent cloud delete via Trash does not always shrink extension storage immediately — run sync when Sync: Pending changes (click Sync Now) after large cleanups.
Cloud PDF storage (separate limit)
Uploaded PDFs use dashboard storage (300 MB total), not extension local quota. See Upload PDFs to the cloud.