A free flowchart and diagram maker with no sign-up

If you want a free alternative to Lucidchart for flowcharts, org charts or database diagrams, open Diagrams. There is no account, no cap on how many diagrams you make or how many shapes they hold, and no watermark on exports. It runs in your browser, so your diagrams stay on your device.

Open Diagrams

Step by step

1. Open Diagrams. To start from an example, pick Flowchart, Org chart or ER diagram under Templates. Otherwise start with the empty canvas and type a name at the top left.
2. Add shapes from the Shapes list: click one to drop it in the middle of the screen, or drag it to where you want it. There are flowchart shapes (start/end, decision, input/output, document, database, preparation), basic shapes, a note, an actor, a text box and an entity (table) for database diagrams.
3. Double-click a shape and type. Enter starts a new line; click outside or press Esc when you are done. With a shape selected you can also simply start typing.
4. To connect two shapes, hover over the first one, drag from one of its blue dots and drop on the other shape. To add the next step of a flowchart, select a shape and click one of the small arrows around it: a connected copy appears in that direction.
5. Use the panel on the right to change fill, line and text colours, line width, dashed lines, text size and alignment. For a connector, choose elbow, straight or curved, the ends (arrow, open arrow, diamond, circle, bar, crow's foot) and a label.
6. Select several shapes by dragging a box around them or with Shift+click, then use Align to line them up or space them evenly.
7. Press Export for a PNG, SVG or PDF, and Save file to keep an editable copy you can open later with Open.

Who it helps

• Students. Flowcharts for programming assignments, ER diagrams for a database course, or a process for a report, without hitting the free-plan limits of paid tools in the middle of a project.
• Small teams and managers. An org chart or a simple process map that you can export as a clean PNG for a slide or a document.
• Developers. A quick database sketch with crow's foot ends, or an SVG of a flow for documentation.
• Anyone with sensitive diagrams. Internal processes and structures never leave your computer.

Why it's private

Diagrams is a static page. What you draw is saved in your own browser's storage on this device and is never uploaded. The page's security policy blocks it from sending data to other websites, exports are made on your device, and it works offline after the first visit. Clearing your browser data deletes the diagrams saved there, so keep important ones as a file with Save file.

Tips and limits

• Snapping: shapes snap to the grid and show pink guides when they line up with other shapes. Turn off Grid for free placement, or hold Alt while dragging.
• Moving around: scroll to pan, Ctrl + scroll to zoom, hold Space and drag, or press F to fit the whole diagram on screen. On a phone, drag with one finger and pinch.
• Copy and paste work between diagrams and browser tabs. Pasting plain text creates a text box.
• PDF export is a sharp image of the diagram inside a PDF, so the text in it is not selectable. Use SVG when you need vector output.
• Text uses a common system font (Arial or similar) so exports look the same on every computer.
• Not included: live collaboration, comments, Visio files, data-linked shapes or connectors that route around other shapes.
• Press ? in the app for every keyboard shortcut.

FAQ

Is Diagrams really free, with no limits?

Yes. There is no paid plan and no limit on the number of diagrams or shapes, and exports have no watermark. It is a static web page that runs in your browser.

Do connectors stay attached when I move shapes?

Yes. A connector drawn from one shape to another stays attached to both and re-routes as you move or resize them. Drop it on a blue dot to fix the side it attaches to, or anywhere on the shape to let it pick the side that faces the other shape.

Can I export my diagram for Word, Google Docs or slides?

Yes. Export a PNG image (with a white or transparent background) to paste into documents and slides, an SVG for sharp scaling, or a PDF. You can also export only the selected shapes.

Can I work on it with other people at the same time?

No. There is no account and no server, so there is no live collaboration or commenting. To share an editable copy, use Save file and send the .diagram.json file; the other person opens it with Open.

Does it work on a phone?

Yes. Tap a shape to select it, double-tap to type, drag from a blue dot to connect, drag with one finger to move around and pinch to zoom. A small bar at the bottom of the canvas has Text, Copy, Style and Delete.

Related tools

• Whiteboard: sketch freely by hand when boxes and arrows are too strict.
• SVG to PNG: render an exported SVG at any size.
• Kanban Board: track the tasks your process chart describes.
• Images to PDF: combine several exported diagrams into one PDF.
• All guides