Tooldeon

Gantt chart maker

Write one task per line: a name, a start date and an end date or a length. Add the name of an earlier task to link them with an arrow. The chart is drawn in your browser and nothing is uploaded.

Format: name, start, end or length, predecessor (optional). Dates are YYYY-MM-DD; a length is like 5d or 2w; the start can be “after” the predecessor. Up to 30 tasks.

Website launchMar 2Mar 9Mar 16Mar 23Mar 30Apr 6PlanPlan: Mar 2 – Mar 6DesignDesign: Mar 7 – Mar 16BuildBuild: Mar 9 – Apr 3TestTest: Apr 4 – Apr 10LaunchLaunch: Apr 11 – Apr 1141 days

Runs in your browser: nothing you enter is sent anywhere.

How to use it

  1. Type one task per line, for example Design, 2026-03-09, 10d, Plan.
  2. Use after as the start to begin the day after the predecessor finishes.
  3. Add a title and download the chart.

How it works

The chart spans from the earliest start to the day after the latest end. Each bar is placed in proportion to its dates, and the date labels on top use a step of 1, 2, 7, 14, 30 days or longer so there are at most about twelve of them.

Worked example

With the default data, Plan runs 2 March for 5 days, so it ends on 6 March. Design starts after it, on 7 March, and lasts 10 days, to 16 March.

Tips

  • List predecessors above the tasks that depend on them.
  • Keep names short; the first 22 characters are shown.

Frequently asked questions

How do I write a task?

Use one line per task with commas: name, start, end. The end is either a date such as 2026-04-03 or a length such as 5d (days) or 2w (weeks). A length counts the start day, so a 5d task starting on Monday ends on Friday.

How do I link tasks?

Add the name of an earlier task as the fourth item. An arrow runs from the end of that task to the start of this one. If you write after instead of a start date, the task begins the day after its predecessor ends.

Does the tool schedule tasks for me?

No. It draws the dates you give. Dependencies are shown as arrows and used only for the optional after start; it does not find a critical path or move tasks.

How do I save the chart?

Press Download PNG for a picture on a white background or Download SVG for a scalable vector file. Both are made in your browser.

More in Education

All tools in this category: Education ·Updated November 3, 2026

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