Diagrams with depth.

DrillFlow is a diagram editor where every node can open into its own sub-diagram. Zoom in, understand, come back up — with breadcrumbs instead of tab chaos. Runs locally in your browser.

Open the editor Free · no account needed

Everything DrillFlow does

Any shape can open a level of its own. But one thing at a time.

Drill-down

A process never fits on one canvas

An onboarding, an incident runbook, a service map: draw the shape of it, then put the detail inside the step it belongs to. Breadcrumbs say where you are, and one click takes you back up.

Any node can hold its own sub-diagram, as deep as you need
Inputs and outputs of a level are drawn on its boundary
Rename a node and its level follows, in both directions

Import

Start from what you already have

A Mermaid flowchart with subgraphs becomes real levels, not one flat picture. draw.io and Excalidraw files come in with their shapes, labels and strokes.

Mermaid: every subgraph turns into a Subflow you can walk into
draw.io and Excalidraw files, including freehand and images
Import into the document you have open, not only into a new one

flowchart TD
  A[Order] --> B[Payment]
  subgraph Payment
    C[Card]
    D[3-D Secure]
  end

Presentation

Walk an audience through it, one step at a time

Presentation mode runs the flow as a talk. A step that owns a sub-diagram is followed by that sub-diagram's steps, so drilling in is an ordinary page turn — the one thing no other viewer can do.

Order comes from the arrows, then from the document
The current step is lit, the rest dims — nothing moves
Free, in the editor and in every shared link

Assistants

Let an assistant draw the first version

Any assistant that speaks MCP can use DrillFlow — the server is in the official MCP registry, so it is one install away. Ask for the process, get a link back, then open it and fix what the assistant got wrong.

One line to install: npx -y drillflow-mcp
Listed as de.drillflow/mcp — Claude, Claude Code and ChatGPT are tested
No MCP? The document format is public, so any model can write one

Cloud

The same document on the next machine

Local-first stays the default: nothing leaves your browser unless you say so. Switch a document on, and it follows you — with every version of the last 30 days behind it.

Per document and opt-in, never your whole folder
Version history: go back to this morning, or to last week
Search every document in your cloud at once

Pricing

What you get, and when an account is worth it

The editor is free and stays free. An account keeps your links alive; Pro adds the cloud.

Without an account

Free, forever

Nothing to sign up for.

Drill-down, as deep as you need
Import from Mermaid, draw.io and Excalidraw
Presentation mode

Open the editor

Free account

Free, forever

Your links stop expiring.

Manage links, revoke them, set an expiry
Your settings follow your account
Search every document on this device

Create an account

ProComing soon

Pricing to follow

Your documents on every device.

One HTML file that keeps the drill-down
Documents in your cloud, on every device
Version history, 30 days back

What Pro includes

Compare every feature

Drawing
	Without an accountFree, foreverNothing to sign up for.Open the editor	Free accountFree, foreverYour links stop expiring.Create an account	ProPricing to followYour documents on every device.What Pro includes
Drill-down, as deep as you need	Included	Included	Included
Layers, freehand pen, hand-drawn shapes	Included	Included	Included
Import from Mermaid, draw.io and Excalidraw	Included	Included	Included
Presentation mode	Included	Included	Included
Documents stay in your browser, and work offline	Included	Included	Included
Export
PNG, SVG, PDF, Markdown, Mermaid, JSON	Included	Included	Included
Every level at once, as a zip	Not included	Not included	Included
Without the DrillFlow mark	Not included	Not included	Included
One HTML file that keeps the drill-down	Not included	Not included	Included
Sharing
Read-only link, drill-down included	Included	Included	Included
Embed in another page	Included	Included	Included
Size of a shared document	2 MB	2 MB	8 MB
How long a link lives	90 days	No expiry	No expiry
Manage links, revoke them, set an expiry	Not included	Included	Included
Password, readable address, view count	Not included	Not included	Included
Across devices
Your settings follow your account	Not included	Included	Included
Search every document on this device	Not included	Included	Included
Documents in your cloud, on every device	Not included	Not included	Included
Version history, 30 days back	Not included	Not included	Included
Search your whole cloud at once	Not included	Not included	Included
Assistants
An assistant can publish a diagram for you (MCP)	Included	Included	Included
…into your account, under your name	Not included	Not included	Included

Nothing in the two free columns will ever move to Pro. Pro pays for what costs us something to run: storage, versions and search on our servers.

FAQ

Frequently asked questions

Is DrillFlow really free?

Yes. The editor is free and stays free. An optional Pro plan for cloud features will come later — nothing that is free today will become paid.

Where is my data stored?

Locally in your browser (IndexedDB). Only what you actively share reaches our servers — as a snapshot, stored in Germany.

How does sharing work?

"Share" uploads a read-only snapshot of your document and creates a link. Anyone with the link can view the diagram and drill into it. With an account you can manage and revoke your links.

Do I need an account?

No. Drawing, exporting and sharing work without one. You only need an account to manage the links you have shared.

Does DrillFlow work offline?

Yes. DrillFlow is an installable web app (PWA) and keeps working without an internet connection after the first load.

Can an AI assistant create diagrams for me?

Yes. Ask your assistant for a Mermaid flowchart with each level in a subgraph, then use Import → Mermaid… — every subgraph becomes a real drill-down Subflow. The full document format, plus a ready-made skill for Claude, is documented at Format. Or skip the copying: an MCP server puts DrillFlow in the assistant’s own tool list with npx -y drillflow-mcp, so it publishes the diagram and hands you the link — see Docs.

Do you track me?

No. No analytics, no ad cookies, no fingerprinting. The only cookie is a functional session cookie when you sign in to the app.

Contact

Question or feedback?

A bug, a wish, or a question — write to us right here.

Ready to zoom in?