A free timeline maker for roadmaps, launches, and history
- Free
- No sign-up
- Works offline
Fold long timelines into serpentine rows, pick one of five track styles, then press Present and watch each event tell its part of the story.
Present reveals your timeline one step at a time, on its own.
Diagramium is a free timeline maker that runs in your browser and turns a list of dated events into a timeline that presents itself, step by step, with optional AI voice narration. It is built for the timelines that usually get awkward: long ones fold into serpentine rows, five track styles restyle the whole track, and the elapsed time between events is labeled automatically.
You need no account to draw, present, or export a still image. Your timeline lives on your own device — Diagramium is local-first, works offline once loaded, and never uploads your diagram content. Build a project roadmap, a product launch plan, or a history timeline, then press Present and walk your audience through it one event at a time.
What a timeline is made of
A timeline is dated events pinned along an axis, read in one direction, with the elapsed time between events labeled right on the track. Axis, events, gaps — that is the whole notation, and it is why a clear timeline reads faster than the paragraph it replaces.
In Diagramium each event carries a date and a label, and you can place it above or below the axis. Alternate sides to keep labels from crowding, or hold milestones on one side and context on the other. The gap between neighboring events is measured and labeled for you in days, weeks, months, or years, so a two-year quiet stretch in a company history shows up as visible distance, not a footnote.
Choose a timeline when the question is when things happened. When the question is how long tasks take and which depend on which, reach for a Gantt chart instead — bars with durations and dependencies rather than points on a line. Our guide to timelines and roadmaps walks through the choice in detail.
Five track styles and a serpentine fold
Long timelines fold into serpentine rows instead of shrinking. Forty events on one straight line either scroll off the page or become unreadable; in Diagramium the axis snakes back and forth across multiple rows, so a decade of history fits on one screen and still reads in order.
The track itself comes in five styles: a classic line, a railway track, a chevron band, bold arrows, and a capsule strip. A product launch plan and a museum-style history timeline do not have to look like the same chart. Editing stays direct — drag an event to reorder it, or flip it to the other side of the axis — and the elapsed-time labels update as you move things.
The story plays in order
Press Present and the events take the stage one at a time, in order, so your audience follows the story instead of scanning a finished chart. Optional AI voice narration reads each step aloud, subtitles highlight the words as they are spoken, and a spotlight holds attention on the current event.
Each event can also carry speaker notes and a "why this matters" insight that appears alongside it during the presentation. Add background music if the moment calls for it. A quarterly roadmap review becomes a guided walkthrough; a history lesson becomes a narrated story rather than a handout.
From first event to finished timeline
You can go from a blank axis to a presented, exported timeline in seven steps.
- Open the timeline editor in your browser. There is nothing to install and no account to create.
- Add your events. Give each one a date and a short label; the axis spaces them and labels the elapsed time between them automatically.
- Pick a track style — classic, railway, chevron band, bold arrows, or capsule — and let a long timeline fold into serpentine rows.
- Arrange the story. Drag events to reorder them, and flip key milestones above or below the axis so the layout reads cleanly.
- Add narration or speaker notes to the events you want to explain, then press Present to rehearse the step-by-step reveal.
- Export the result: PNG and SVG are free for everyone, while animated GIF, video, and animated SVG unlock with a free account — there is no paid tier. You can also record the presentation live.
- Prefer a head start? Open a ready-made timeline in Explore and edit it. Any diagram published in the gallery can also be embedded on another website as a self-playing iframe.
Free, private, and on your device
Diagramium is free, shows no ads and runs nothing that tracks you; anonymous per-diagram counters are the only telemetry, and your diagram content is never collected. Timelines live in your browser and in the files you export, and the app keeps working offline once it has loaded.
The timeline editor is one of 27 diagram editors in the same app, so your roadmap can sit next to the flowchart and the org chart that explain the rest of the plan — all with the same step-by-step Present mode.
Frequently asked questions
Is the timeline maker free, and do I need an account?
Diagramium's timeline maker is free, and you need no account to draw a timeline, present it, or export it as a PNG or SVG image. A free account unlocks the animated export formats — GIF, video, and animated SVG. There is no paid tier.
What formats can I export my timeline in?
You can export a timeline as PNG or SVG with no account. Animated GIF, video, and animated SVG exports unlock with a free account, and you can also record a live run of the presentation. Diagrams published in the Explore gallery can additionally be embedded on other websites as self-playing iframes.
Does the timeline maker work offline, and where are my timelines stored?
Your timelines are stored on your own device and in the files you export — Diagramium is local-first and never uploads diagram content. Once the app has loaded in your browser, the timeline maker keeps working without an internet connection.
How do I fit a long timeline on one page?
Use serpentine folding: Diagramium wraps a long timeline across multiple rows, so the axis snakes back and forth and dozens of events fit on one screen while still reading in order. Combined with drag-to-reorder and events placed above or below the axis, even a crowded history stays legible.
Can the timeline show how much time passed between events?
Yes — Diagramium calculates the elapsed time between neighboring events and labels the gap automatically in days, weeks, months, or years. A long pause between two milestones becomes visible on the axis itself, which matters for launch retrospectives and history timelines alike.
Should I use a timeline or a Gantt chart for a project roadmap?
Use a timeline when the roadmap is about when milestones happen — launches, releases, decisions. Use a Gantt chart when it is about how long tasks take and which tasks depend on which. Diagramium includes a separate Gantt editor, so you can keep milestone timelines and task schedules side by side.
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