Download
Native builds for all three platforms.
Windows
x64- Portable .exe
single file, no installation — needs WebView2 already on the system (ideal for a USB stick)
- Installer
bundles WebView2 — for machines that don’t have it
Windows may show a SmartScreen warning for unsigned builds — choose “More info → Run anyway”.
macOS
Apple Silicon & Intel- Apple Silicon (.dmg)
M1 and newer
- Intel (.dmg)
older Intel Macs
The build is not notarized by Apple — on first launch, right-click the app and choose “Open”.
Free and open source (MIT) · No account, no telemetry · View source on GitHub
Features
Web package or single file
A multi-file package for your server (send a link) — or one self-contained HTML file for e-mail. Your choice.
Fully responsive
The catalog works as well on a phone as on a desktop. Tree, search and statistics are touch-friendly.
Smart search
Full-text search across the whole tree with wildcards (*, ?), accent-insensitive matching, name or full-path search, and per-folder scope.
Statistics by file type
Automatic categories — photos, RAW, video, audio, documents, archives, e-mail, databases and more — with pie charts and per-folder totals.
Handles huge trees
Folders load lazily, so catalogs stay fast even with millions of files. Stress-tested on 1,000,000 files in 26,000 folders.
Privacy first
D2H only reads file names, sizes and dates — never file contents. Everything runs locally on your machine.
Your branding
Add your own logo and colors — the catalog carries your identity, not ours.
7 languages
Output and interface in English, Czech, German, Italian, Spanish, French and Polish. The app follows your system language.
Windows, macOS & Linux
Native desktop application for all three platforms. Not a web service — no account, no telemetry.
Works offline
The single-file export opens without any internet connection.
155,000 files across 6,000 folders — 576 GB of data — cataloged in about 3 seconds. The result: a 5 MB web package or a single 7 MB HTML file you can e-mail.
Measured on a modern laptop — an example, not a guaranteed figure.
Why D2H
D2H stands on the shoulders of Snap2HTML — a great free tool we used for years. We rebuilt the idea from scratch for today’s workflow: mobile customers, huge recovered trees, and sharing by link.
| Snap2HTML | D2H | |
|---|---|---|
| Platform | Windows app | Windows, macOS & Linux |
| Output | single HTML file | single file or web package → send a link |
| Data | plain text embedded in the HTML | gzip-compressed chunks, loaded on demand |
| Huge trees | whole file parsed on open | lazy loading — instant open even with 100k+ files |
| Mobile | desktop-oriented layout | fully responsive, touch-friendly |
| Search | file name search | full-text, wildcards, accent-insensitive, path search, per-folder scope |
| Statistics | — | categories, pie charts, per-folder totals |
| Branding | fixed look | your logo & colors |
| Price | free, open source | free, open source (MIT) |
Snap2HTML also offers things D2H doesn’t: clickable file:// links into the listed folders and CSV/JSON/text export. If you need those, it remains a fine choice.
Frequently asked questions
Does D2H send my data anywhere?+
No. It reads only file names, sizes and dates, and everything runs locally on your machine. The code is open source, so you can verify it.
How large a directory tree can it handle?+
Over a million files. In our stress test, D2H scanned and generated a catalog of 1,000,000 files in 26,000 folders (227 TB of data) in under 30 seconds on an ordinary laptop. The catalog opens in the browser in a few seconds and search stays instant — folders load on demand. One practical note: a single-file HTML catalog grows to roughly 35 MB per million files, which can exceed e-mail attachment limits — for very large trees, use the web package instead.
Does the output work on mobile?+
Yes, the generated catalog is fully responsive and touch-friendly.
Do I have to upload the catalog somewhere?+
No. You can either generate a web package for your server (and send a link), or a single HTML file to attach to an e-mail — whichever fits the job.
Can I use my own logo and colors?+
Yes, both can be set in the application.
How much does it cost?+
Nothing. D2H is free and open source under the MIT license.
Windows shows a warning when I run it — is it safe?+
Yes. The warning only means the build is not commercially code-signed. The source code is public and can be audited.
Can I script it?+
Yes — a full CLI ships alongside the GUI, and a JSON config file drives branding, defaults and job-number rules.
Have a suggestion or found a bug? Open an issue on GitHub