Contextium tags work the way you already think. Type #anything inside a file and it becomes a tag — flat, instant, no setup. Click it to find every file that shares it.
Tags live right in your content. Save the file and they're tracked automatically.
Most tools make you design a system before you can use it
The entire tagging workflow, in three steps
Anywhere in a file's content, type # followed by a word. Just like Obsidian — the tag is part of what you wrote. Save the file and Contextium tracks it automatically.
No dialog, no dropdown, no setup — the tag exists because you typed it.
Tags render in your link color wherever they appear. Click one and Contextium opens the Files page filtered to that tag — every file that mentions it, instantly.
One click takes you from a single mention to the whole topic.
On the Files page, pick several tags at once to narrow your library down to exactly the files that carry all of them.
Combine tags to slice your knowledge base however you need.
Everything you need, nothing you have to maintain
Every tag is just a word. No tag types, no categories, no nesting to set up or keep in order — so there's nothing to learn before you start.
Pick whatever words make sense to you. They all live in one flat space.
Open the Tags rail beside any file to see every tag it carries at a glance — a quick map of what the file is about.
Click any tag in the rail to jump straight to the rest of the files that share it.
On the Files page, select any combination of tags to instantly narrow your library to the files that carry all of them.
Because tags live in your content, they help your AI zero in on the right files. Clear tags make for clearer context.
Same simple #tag, endless uses
Tag files with the topics they cover, then click the tag to pull up everything on that subject.
A file can carry several tags at once, so it shows up under every theme it touches — not just one folder.
Tags in your content help your AI surface the right files when you ask it questions.
Note where a file stands with tags like #draft, #review, or #deprecated — right in the content.
Drop tags like #urgent or #review-needed so the files that need attention are one click away.
Tag files by team or area, then filter the Files page so everyone can find their own slice fast.
Your tagging system integrates across all Contextium features
Join thousands of teams who organize their docs with a single keystroke — no setup required.
Free plan available • Unlimited tags • No credit card required
Tags are one layer of a complete AI collaboration platform
Tags make it easy to gather related files for a workflow. Tag a document #authentication and it's one click to find everything else on that topic when you set up your AI's context.
Because tags live in your content, skills and agents can lean on them to find relevant files. Tag your API docs #api and your AI has a clear signal for which files to pull in — keeping every session focused.
AI Chat lets you ask questions about a specific tag — "what do our #payments docs say about refunds?" Get precise answers from only the relevant slice of your knowledge base.
Tag the files behind a piece of work — #frontend or #api — so it's easy to gather exactly the documentation a task needs.