What is it?
ZDDC is a convention, not a platform. Every deliverable's filename encodes its tracking number, revision, status, and title; every transmittal folder is date-prefixed and self-describing. A plain folder on your computer or a shared drive becomes a fully searchable, auditable record — no server, no database, no software required to read it.
The three tools below are optional helpers around this structure. Each is a single HTML file that works entirely on your own machine: open it, pick a folder, and you're working. They run offline and never upload anything. You can start with Browse on your existing files right now — there's nothing to set up first.
The tools
Three single-file apps. Click one to open it now, or right-click → Save As to keep your own copy — each works offline forever, with no install and no updates.
- Open files on your computer and preview them instantly — PDFs, Word, Excel, images, markdown
- Move through your folders the way you already think about them
- Edit markdown in place and save it as Word, PDF, or HTML
- Works completely offline; your files stay on your machine
- Rename messy files into clean, consistent names
- Give each file a tracking number, revision, and status just by dropping it into place
- Group deliverables into dated transmittal folders, ready to send
- Edit like a spreadsheet; saves the organized copies back to your folder
- Search and filter by tracking number, status, discipline, or plain text
- See every revision of a deliverable and where it is in its lifecycle
- Group by transmittal to see what was sent, and when
- Download any selection as a ZIP — read-only, nothing gets changed
To open a folder straight from your computer, use a Chromium-based browser — Chrome, Edge, or Brave. That one feature isn't available in Firefox or Safari yet. Browse all versions →
But how can I trust you?
Great instinct — so don't. Verify instead. It takes about thirty seconds, and you never have to take our word for a thing.
Pull the plug
Turn off your WiFi and use it anyway. Still works? Then nothing is being uploaded — there's nowhere for it to go. Do your real work this way and the question answers itself.
It only sees what you hand it
When you pick a folder, your browser fences the tool inside that one folder. It cannot peek anywhere else on your computer — even if it wanted to. That guarantee comes from the browser itself, not from us.
Read it yourself
Each tool is a single open-source file. Open it up and look — or paste it into your favorite AI and ask, “is this sending my data anywhere?” Honest tools survive that question.
We built it this way on purpose. The best privacy promise is the kind you can check for yourself.
Learn more
- Technical Reference — the full ZDDC convention: filename format, tracking numbers, revisions, status codes, folder naming, and transmittal workflow.
- All releases — every version of every tool.
- codeberg.org/VARASYS/ZDDC — source code and issue tracker.