A free decision tree maker where every path reaches an answer
- Free
- No sign-up
- Works offline
Ask the question, branch on the answer, and press Present — the tree walks one path at a time instead of showing every branch at once.
Present reveals your decision tree one step at a time, on its own.
A decision tree turns "it depends" into something a person can follow on their own. Free to build here, no account needed, kept on your device.
It is the right diagram whenever the same question keeps being asked and the answer is a chain of conditions — eligibility, triage, escalation, which tool to use for which job.
Questions, branches, and the rule that makes a tree work
Each node is a question with a clear answer; each branch is one of those answers; each leaf is an outcome. The whole notation is that simple, and it holds together on one rule: every path ends at an outcome.
A branch that trails off unfinished is the defect readers hit most, because they only ever discover it on the path they happen to take. Ask each question so the answers are exhaustive — and where they cannot be, add an explicit "anything else" branch that routes to a human rather than to nothing.
Order the questions so the one that eliminates the most branches comes first. A tree that asks its narrowest question at the top makes every reader walk further than they need to.
Keep the questions answerable without judgement
A decision tree is only useful if two people walking it reach the same place. "Is the customer important?" fails that test; "Is the account over £10,000 annually?" passes it.
Where a genuinely subjective call is unavoidable, make the branch say so and route it to a named person. That is a documented escalation rather than a hidden inconsistency.
Present one path at a time
A finished tree shown all at once is a thicket. Press Present and it reveals question by question, so a training session follows a single path to its conclusion before the next branch appears.
How to make a decision tree, start to export
Open the editor, put the first question at the top, then draw a branch for each answer. Keep going until every branch reaches an outcome. Export a PNG or PDF for a runbook, or publish it and embed the player where the decision is actually made.
Free, private, and offline
Diagramium is free and there is no paid tier. Draw, present and export PNG or SVG without an account; a free account unlocks the animated export formats — GIF, video and animated SVG.
Your diagram is stored in your own browser, not on a server. It keeps working with the network off, and nothing is uploaded unless you choose to publish it.
Frequently asked questions
Is this decision tree maker free?
Diagramium is free and there is no paid tier. Draw, present and export PNG or SVG without an account; a free account unlocks the animated export formats — GIF, video and animated SVG.
What is the difference between a decision tree and a flowchart?
A flowchart can loop and rejoin; a decision tree only branches outward and never comes back together. If your diagram needs to rejoin paths or repeat a step, you want a flowchart.
How deep should a decision tree go?
Rarely more than four or five questions on any one path. Longer than that and people stop following it — split the deep branches into their own trees and link between them.
What if a question has more than two answers?
Draw a branch for each. Binary trees are a convention, not a rule, and forcing a three-way choice into two yes/no questions usually makes the tree harder to read.
Can I share a decision tree with a team?
Export a PNG or PDF for a handbook, or publish it and embed the interactive player in an internal page so people walk the tree rather than reading it.
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