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project-timeline-maker

A project timeline maker visualises a project's tasks as horizontal bars on a calendar, showing each task's start, duration, end, and dependencies — the classic Gantt-chart format Henry Gantt formalised in the 1910s and that remains the default for project planning a century later. The ZTools Project Timeline Maker runs entirely in the browser, supports task list with start dates and durations, dependency arrows (task B starts after task A), milestones (zero-duration markers), critical-path highlighting, and PNG / SVG export.

Use cases​

Software product release​

Design / development / QA / launch with handoff dependencies. Timeline shows the critical path; slipping a task on it slips the launch. Slipping off-path tasks may not affect launch — visible at a glance.

Wedding or event planning​

Vendor bookings, invitations, fittings, day-of tasks. Some tasks have hard dependencies (cake order before tasting); others run parallel. Timeline prevents missed lead times.

Research project / thesis​

Literature review → study design → IRB approval → data collection → analysis → writeup. Dependencies enforced; deadline reverse-engineering exposes whether the schedule is realistic.

Construction or renovation​

Demolition → framing → electrical → drywall → finishes. Trades hand off; one delay cascades. Gantt-style timeline surfaces cascade risk early.

How it works​

  1. Add tasks — Task name, start date (or "after task X"), duration in days. Each task becomes a horizontal bar on the timeline.
  2. Set dependencies — Mark "task B starts after task A finishes". Tool draws arrow + reschedules B if A moves.
  3. Add milestones — Zero-duration markers for key dates (launch, deadline, review meeting). Visual reference points.
  4. Compute critical path — Tool identifies the longest dependency chain — the path that determines project end date. Highlighted in red.
  5. Export — PNG for slide decks, SVG for printing, JSON for re-importing or sharing.

Examples​

Input: 6-week product launch: design 2w → dev 3w → QA 1w → launch milestone

Output: Critical path = 6 weeks; design slip 3 days = launch slip 3 days; QA can compress only at quality cost.

Input: Thesis: 4-week lit review || 2-week IRB || then 8-week data collection → 6-week analysis → 4-week writeup = ~22 weeks

Output: Lit review and IRB run parallel; data collection is the constraint; total ≈ 22 weeks.

Input: Renovation with 5 trades, 3 dependencies

Output: Timeline shows trades sequenced; idle gaps where one trade waits for previous; opportunity to compress by overlapping.

Frequently asked questions​

When is a Gantt chart overkill?

For projects under 10 tasks with no real dependencies, a checklist works fine. Gantt earns its keep when dependencies + parallel work create coordination cost.

What is the critical path?

The longest sequence of dependent tasks. Total duration of project = sum of critical-path tasks. Slipping any of them slips the project. Slipping off-path tasks may not.

How do I estimate task durations?

Three-point estimation: best, worst, most-likely. Weighted average ((best + 4×most + worst) / 6). More honest than single-point estimates.

How granular should tasks be?

Each task: 1-10 days. Smaller than 1 day clutters; larger than 10 hides risk. Break large tasks into sub-tasks.

How often do I update the timeline?

Weekly minimum. Each week: mark progress, re-baseline future tasks, recompute critical path. Stale Gantt charts deceive worse than no chart.

Can I export to MS Project / Asana?

JSON export captures structure; importing into specialised tools requires their format. PNG / SVG always work for sharing.

Tips​

  • Add buffer at the project level (10-25%), not on every task. Per-task buffers get consumed; project-level buffer is visible.
  • Highlight the critical path in red — the team's attention should focus there.
  • Update weekly. The Gantt chart is a living plan, not a one-time artifact.
  • For long projects, show two views: full timeline (overview) + zoomed-in next 4 weeks (action).
  • Identify dependencies early — most slippage comes from unmodeled "I was waiting for X" handoffs.

Try it now​

The full project-timeline-maker runs in your browser at https://ztools.zaions.com/project-timeline-maker — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub