How LINE caches link previews

LINE caches preview data after Linespider fetches a page. The cache duration isn’t documented, but it can persist for a long time. Re-sharing the same URL may serve cached data.

Official cache-clearing tool

LINE is one of the few messaging platforms that provides an official cache-deletion tool through the LINE Developers site. You can request cache invalidation for specific URLs, forcing a re-crawl on the next share – similar to Facebook’s Sharing Debugger.

Check the LINE Developers documentation for current tool location and usage.

Forcing a refresh without the tool

1. Wait for natural expiry – timing is unpredictable
2. Append ?v=2 to force LINE to treat the URL as new
3. Share in a new message after the cache expires

Cache behavior for images

Images cache separately from text metadata. Title and description may update while the image still shows a cached version. The cache-clearing tool should invalidate both.

When caching goes wrong

• Updated tags but old preview – use the cache-clearing tool or wait
• Image updated but old image showing – image cache is separate; use the clearing tool
• No preview after fixing OG tags – the error state may be cached; clear and retry