When you use Perplexity to research and save information, your Library can grow quickly with hundreds of threads, collections, and sources. Finding a specific thread from last month or a collection about a particular topic becomes difficult without filtering tools. Perplexity provides built-in filters that let you sort and narrow your Library by date range or topic keywords. This article explains exactly how to apply these filters so you can locate any saved item in seconds.
Key Takeaways: Filtering the Perplexity Library
- Library > Sort by Date: Switch between Newest First or Oldest First to locate threads by creation time.
- Library > Search Bar: Type a topic, keyword, or phrase to filter threads and collections that contain that term.
- Library > Filter by Collection: Use the Collection dropdown to view only threads saved inside a specific folder.
How the Perplexity Library Organizes Your Saved Content
The Perplexity Library stores every thread you have saved manually or automatically. Each thread includes the original query, the AI response, and any attached sources. Collections act as folders where you can group related threads. By default, the Library displays all threads in reverse chronological order with the newest thread at the top.
The filtering system works on two levels: date sorting and text search. Date sorting reorders the entire list. Text search filters out threads that do not contain the typed keyword in the thread title, query text, or AI response. You can combine both filters at the same time.
Prerequisites for Filtering
You need an active Perplexity account with at least one saved thread or collection. The Library is available on the web app at perplexity.ai and in the mobile apps for iOS and Android. The filtering steps are identical across all platforms.
Steps to Filter the Library by Date or Topic
Follow these steps to locate specific threads using date sorting or keyword filtering.
- Open the Library page
Log in to your Perplexity account. On the web app, click Library in the left sidebar. On mobile, tap the Library tab at the bottom of the screen. The Library opens showing all your saved threads and collections. - Switch the date sort order
Look for the Sort by dropdown near the top of the thread list. Click or tap it. Select Newest First to see the most recent threads at the top. Select Oldest First to see the earliest saved threads first. The list reorders immediately. - Filter by topic using the search bar
Locate the search bar above the thread list. Type a keyword or phrase related to the topic you want. For example, type budget 2025 to show only threads that mention budget 2025. Press Enter or tap the search icon. The Library displays only threads and collections that contain that term in the title, query, or response text. - Clear the search filter
To remove the keyword filter, click the X icon inside the search bar or delete the text. The Library returns to showing all threads with the current sort order. - Filter by a specific collection
If you use Collections, click the Collection dropdown next to the search bar. Select a collection name from the list. The Library shows only threads inside that collection. To return to all threads, select All Collections from the same dropdown. - Combine date sort and keyword filter
Set the sort order to Oldest First. Then type a keyword in the search bar. The Library shows threads from earliest to latest that match the keyword. This combination helps you find the first thread you created about a specific topic.
Common Mistakes and Limitations When Filtering the Library
Search Does Not Find a Thread I Know Exists
The search bar matches text in thread titles, the original query, and the AI response. It does not search the text of attached PDFs, images, or external links. If you cannot find a thread, try a shorter keyword or a synonym. Also check that the thread is not inside a collection that is currently filtered out.
Date Sort Shows the Wrong Order
The sort order applies to the date the thread was created, not the date the last message was added. If you edit a thread or add a follow-up, the sort position does not change. To see threads by last activity, use the Library > Recent view on the web app instead.
Filter Disappears After Refreshing the Page
Perplexity resets the search bar and sort order to defaults when you reload the Library page. This is by design. After refreshing, you must reapply the sort order and keyword filter. Consider bookmarking a search URL if you use the same filter frequently.
Mobile App Search Is Less Precise
On the iOS and Android apps, the search bar filters threads by title and query only. It does not search the AI response text. If you cannot find a thread on mobile, try searching on the web app where the response text is included.
Perplexity Library Filtering: Web App vs Mobile App
| Item | Web App | Mobile App |
|---|---|---|
| Date sort options | Newest First, Oldest First | Newest First, Oldest First |
| Search scope | Title, query, AI response text | Title and query only |
| Collection filter | Dropdown menu with all collections | Dropdown menu with all collections |
| Combine sort and search | Yes | Yes |
| Filter persists after refresh | No | No |
The Library filtering tools work the same way on both platforms except for the search scope. Use the web app when you need to find threads by content inside the AI response. Use the mobile app for quick lookups by thread title or query.
Now you can sort your Perplexity Library by date to see the oldest or newest threads first. You can also search by topic keywords and narrow results to a specific collection. To save time, combine the Oldest First sort with a keyword to find the first thread you created about a project. Try creating a new collection for each major topic to make future filtering even faster.