What is Gantt Chart Maker?
Gantt Chart Maker is a free, browser-based tool in the Design & CSS suite. Add tasks, color them, drag bars along a daily timeline, and tune durations with sliders. Perfect for visualizing project schedules. Export as JSON.
The headline benefit: plan projects on a draggable timeline — export as json.
Unlike most online tools that upload your file to a server, process it, and send it back, Gantt Chart Maker runs entirely in your browser. Open DevTools → Network while using it and you'll see zero file-upload requests — only static assets (JavaScript, CSS, fonts) load. Your data never leaves your device.
Why use this gantt chart maker?
Three reasons EasyFileKit's Gantt Chart Maker stands out from the crowd:
Private by design — all processing happens locally via JavaScript and WebAssembly. No server ever sees your input.
Instant — no upload wait, no queue, no server round-trip. Results appear the moment you act.
Free & unlimited — no accounts, no watermarks, no daily caps. Use it as many times as you like.
How to use Gantt Chart Maker — step by step
Here's the complete walkthrough. Everything happens instantly in your browser:
Step 1. Add tasks and assign each a color.
Step 2. Drag bars along the timeline to set start day.
Step 3. Adjust durations using the sliders below.
Step 4. Export your schedule as JSON.
That's it. No sign-up, no upload bar, no waiting. If something doesn't work as expected, check the FAQ below.
Common use cases for Gantt Chart Maker
People reach for Gantt Chart Maker in a few recurring situations:
When you need the result now and can't wait for a server-based tool to upload, queue, and process your file.
When your file is private or sensitive — financial documents, personal photos, medical PDFs — and you don't want it travelling across the internet.
When you're on a slow or metered connection — uploading a 50 MB file just to compress it makes no sense when the same work can happen locally.
When you've hit the daily limit or paywall on another "free" tool site.
Privacy: what actually happens to your data
This is the single most important point about Gantt Chart Maker, so it deserves its own section.
You can verify this yourself in under 30 seconds:
Open Gantt Chart Maker in your browser.
Press F12 to open DevTools.
Switch to the Network tab and tick "Disable cache".
Use the tool — drop a file, type text, whatever the tool needs.
Watch the Network log. You'll see only static assets (JS, CSS, fonts, icons). No request contains your data.
This isn't a setting you toggle or a promise in a privacy policy — it's how the tool is architecturally built. There is no upload endpoint to call.
Gantt Chart Maker: EasyFileKit vs server-based tools
Most "free" online tools that do what Gantt Chart Maker does follow the same model: you upload your file to their server, they process it with a backend script, then they send the result back. Here's the honest comparison:
| Feature | EasyFileKit | Server-based tools |
|---|---|---|
| Speed | Instant (no upload) | Slower (upload + queue + download) |
| Privacy | Complete | Your file is on someone else's computer |
| Cost | Free, unlimited | Often capped or "premium" gated |
| Works offline | Yes (PWA) | No |
|---|---|---|
Server-based tools aren't evil — they exist because some tasks genuinely need heavy backend compute. But for everything Gantt Chart Maker does, client-side processing is strictly better for you.
Under the hood: how Gantt Chart Maker works
Gantt Chart Maker is built with modern browser APIs. Depending on what it does, it may use:
Canvas API — for image manipulation (pixel-level access, filters, resizing).
Web Crypto API — native, hardware-accelerated cryptography (AES-GCM, SHA-256, PBKDF2) for any encryption or hashing.
pdf-lib / pdf.js — fully client-side PDF creation and rendering.
MediaRecorder API — for capturing screen, audio, and video.
WebAssembly — for heavy codecs (image compression, media processing).
All of these run inside your browser's sandbox. They cannot access your filesystem (beyond files you explicitly choose), cannot make network requests with your data, and cannot run persistently in the background.
Pro tips for getting the most out of Gantt Chart Maker
Bookmark the tool — it works offline once cached, so you can use it even without a connection.
Install EasyFileKit as a PWA — open the browser menu and choose "Install app" for a standalone window and offline access.
Use it on mobile — every tool is fully responsive and works on phones and tablets, not just desktops.
No file size anxiety — because nothing uploads, you can process large files that server-based tools would reject or charge for.
Frequently asked questions about Gantt Chart Maker
Q: How many days can the timeline span?
A: From 5 to 90 days — adjust with the Days input at the top.
Q: Can tasks overlap?
A: Yes — multiple tasks can occupy the same days; each row is independent.
Q: How are colors picked?
A: Each new task gets the next color in a balanced 8-color palette. Change any task's color with the swatch.
Q: Can I export to a calendar app?
A: Export is JSON only for now. Convert the JSON to .ics using any external tool if needed.
Try Gantt Chart Maker now
The tool is right above this article — scroll up and start using it. No sign-up, no upload, no limits.
If you found Gantt Chart Maker useful, explore the rest of the Design & CSS suite — there are more tools that work the same private, instant, free way. And if you have a question that isn't covered in the FAQ above, the About page has our contact email.