# Tag NotebookLM notebooks and sources, then filter > Tag NotebookLM notebooks and sources with Kortex, then filter by tag. Tag many at once in the Workspace, and file notebooks by tag. https://www.kortex-notebooklm.com/features/tags-and-source-labels 1. [Features](/features) 2. Tags and source labels Organize # Tags and source labels Kortex tags are colored labels for notebooks in Gemini Notebook (formerly NotebookLM), with a separate set of tags for single sources. In the Kortex Workspace, select rows, add a tag, then filter by it. You can tag many rows at once, rename a tag or delete it everywhere. [Add to Chrome](https://chromewebstore.google.com/detail/kortex/hdapplggdhndkblofffknpmnnnnbncbn) [Follow the tutorial](/tutorials/how-to-tag-notebooklm-sources) [![The All Sources table in the Kortex Workspace with each source’s type, notebook, tags and folder.](/media/features/all-sources.webp)](/media/features/all-sources.webp) Every source across your notebooks, with its tags and folder. ## What are tags and source labels in Kortex? Tags are colored labels you put on notebooks, with a separate set for single sources, in the Kortex Workspace. Select rows, add a tag, then filter by it. ## What you get - ### Labels that cut across folders A notebook sits in one collection but can have many tags. Tag by topic, status or client. Then filter to find it. - ### Tags on single sources Sources have their own tags. The All Sources table shows them next to the notebook each source belongs to. - ### Tag many at once Tick several rows in a table and choose Tags to label them all at once. - ### Tags can do work A Smart Collection can fill from tags. An automation rule can file a notebook when you add a tag. ## How many sets of tags are there? Kortex has tags for **notebooks** and a separate set for **sources**. Open the Kortex Workspace. You see notebook tags in the Notebooks table. The All Sources table shows each source’s type, notebook, tags and folder. Both work the same way. Tick rows, choose **Tags**, and pick a tag or type a new name. The tag then shows as a column in the table and as a choice in **Filter**. ## How do I tag in bulk? Select as many rows as you like. In Notebooks, **Tags** sits next to **Merge**, **Compare** and **Delete**. In Sources, it sits next to **Download**, **Move to Folder** and **Delete**. One action labels all the rows you picked. ## What tags are good for - **Status.** Use tags such as inbox, active and archive. Filter to the stage you are in. - **Themes across projects.** A notebook lives in one [collection](/features/collections-and-folders) but can have any number of tags. - **Rules.** A Smart Collection can fill from tags. The Smart Sort automation moves a notebook into a collection when you apply a tag. ## Where your tags live Tags live in Kortex, not in Gemini Notebook. [Sync and backup](/features/sync-and-backup) explains how your organizing data reaches a second computer. **Manage Space** renames, deletes and creates notebook tags, source tags and artifact tags in one place. It is the quickest way to merge two tags that mean the same thing. ## Finding tagged things The Workspace search finds tags by name, along with notebooks and sources. See [global search](/features/global-search). ## How it works Want every step? [Follow the tutorial](/tutorials/how-to-tag-notebooklm-sources). 1. ### Open a table In the Kortex Workspace, open Notebooks for notebook tags or Sources for source tags. 2. ### Select rows and choose Tags Tick one or more rows and choose Tags. Then pick an existing tag or type a new name. 3. ### Filter by tag Use Filter in the toolbar to show only the rows with a tag. The tags also show as columns in the tables. 4. ### Tidy up in one place Manage Space lets you rename, delete and create notebook tags and source tags in one place. ## Questions people ask Something we missed? [Ask us](#contact). ### What is the difference between a tag and a collection? A collection is a folder for notebooks. A tag is a label you can put on a notebook or a source. A notebook can have several tags. Smart Collections can fill themselves from tags. ### Are notebook tags and source tags the same set? No. Notebooks and sources have separate sets of tags. A source tag labels one source. The All Sources table shows it next to the notebook the source belongs to. ### Can I rename or delete a tag everywhere? Yes, in Manage Space. It renames, deletes and creates notebook tags, source tags and artifact tags in one place. ### Do tags appear inside Gemini Notebook? Tags live in Kortex. They show in the Workspace and in Kortex's own search. They are not Gemini Notebook's own labels. ### How do I tag NotebookLM notebooks? Open the Kortex Workspace, tick the notebook rows, choose Tags, and pick a tag or type a new name. The tag then shows as a column and as a choice in Filter. Tags live in Kortex, not in Gemini Notebook (formerly NotebookLM). ### Can I tag many sources at once? Yes. Select as many rows as you like and choose Tags. One action labels every row you picked. ## Related features The full reference is in the [Kortex docs](/docs/all-sources). - [Collections and folders Folders for notebooks, with subfolders, colors and pins. Folders for sources and artifacts too.](/features/collections-and-folders) - [Global search One search box for every notebook, source, note, collection, tag and podcast.](/features/global-search) - [Automation rules Pick a trigger and an action. Kortex files, tags and generates in the background.](/features/automation-rules) [All Kortex features](/features) ## Try it on your own notebooks. 100,000+ people use the Kortex extension. Install it and try tags and source labels on a notebook you already have. [Add to Chrome](https://chromewebstore.google.com/detail/kortex/hdapplggdhndkblofffknpmnnnnbncbn) 100,000+ users, rated 4.5 on the Chrome Web Store.