D2d is a fast, fully offline data-conversion toolkit for engineers, embedded developers, and anyone working close to the bits. Convert between binary, hexadecimal, decimal, octal, ASCII, Gray code, BCD, and advanced number systems — each conversion comes with a step-by-step explanation, a worked example, and a reference table. Built with Tauri, React, and TypeScript for a lightweight, cross-platform experience.
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- 26 conversion tools across 8 categories — Binary, Hexadecimal, Decimal, Octal, ASCII, Gray code, BCD, and advanced number systems
- Multi-Format converter — edit any field and every other format updates instantly
- Learn while you convert — step-by-step explanations, worked examples, and reference tables for each conversion
- Quality-of-life UX — one-click direction swap, copy-to-clipboard for inputs and outputs, and a searchable conversion catalog
- Arbitrary-precision integer conversions via BigInt — no 32/64-bit overflow
- Advanced numerics — signed/unsigned (8/16/32/64-bit), Base-N (2–36), and IEEE 754 single/double precision
- Dark/light theming and a mobile-responsive UI
- Runs fully offline as a native app for Windows, macOS, Linux, and Android
- Desktop builds auto-update from signed GitHub releases; mobile builds update through their app stores
| Category | Conversions |
|---|---|
| ASCII | ASCII ⇄ Hex, ASCII ⇄ Binary |
| Hexadecimal | Hex ⇄ Binary, Hex ⇄ Decimal, Hex ⇄ Octal, Hex ⇄ ASCII |
| Decimal | Decimal ⇄ Hex, Decimal ⇄ Binary, Decimal ⇄ Octal, Decimal → BCD |
| Binary | Binary ⇄ Hex, Binary ⇄ Decimal, Binary ⇄ Octal, Binary ⇄ ASCII, Binary ⇄ Gray |
| Octal | Octal ⇄ Binary, Octal ⇄ Decimal, Octal ⇄ Hex |
| Gray Code | Binary ⇄ Gray |
| BCD | Decimal → BCD, BCD → Decimal |
| Number Systems | Signed ⇄ Unsigned, Base-N ⇄ Decimal, Float ⇄ IEEE 754 |
The catalog is intentionally easy to extend — see CONTRIBUTING.md.
There are two ways to get D2d:
- Download a pre-built installer from the Releases page and pick the one for your OS.
- Build it from source — see Getting Started.
| OS | Installer | Auto-update | Notes |
|---|---|---|---|
| Windows | *-setup.exe (NSIS) |
Yes | Recommended for personal/desktop installs. |
| Windows | *.msi |
No | For MDM / IT-managed deployments. |
| macOS | *.dmg |
Yes | Open it, then drag D2d to Applications. |
| Linux | *.AppImage |
Yes | Mark it executable, then run. |
| Linux | *.deb / *.rpm |
No | For Debian/Ubuntu and Fedora/RHEL. |
| Android | *.apk |
Via store | Updates arrive through the app store. |
First-launch warning. D2d binaries are currently unsigned at the OS level, so the first time you run the app Windows SmartScreen will show "Windows protected your PC" — click More info → Run anyway. macOS Gatekeeper will say the app cannot be opened — right-click the app and choose Open, then confirm. This is a one-time approval per machine.
Desktop builds (Windows, macOS, Linux) include an in-app auto-updater. On
startup the app checks the latest GitHub release; if a newer version exists
it prompts you to install. You can also trigger the check manually from the
About page. Update artifacts are minisign-signed, so a tampered download
is rejected. The .msi, .deb, and .rpm packages are excluded from
auto-update by design — re-install those manually.
Android and iOS builds do not self-update. Mobile updates are delivered by the Google Play Store and Apple App Store when a new version is published there.
- Node.js 20.19+ (or 22.12+) — required by Vite 7
- Rust (stable) + platform build tools:
- Windows — Visual Studio Build Tools (Desktop C++)
- macOS — Xcode Command Line Tools
- Linux —
build-essential,webkit2gtk, and friends (see the Tauri prerequisites)
- For Android builds only — Android SDK + NDK and JDK 17, configured per the Tauri Android guide
git clone https://github.com/inowio/D2d.git
cd D2d
npm install
npm run tauri devnpm run tauri build
# Installers land in src-tauri/target/release/bundlenpm run tauri android dev # run on a connected device or emulator
npm run tauri android build # build a release APK / AABnpm run dev # Vite frontend only (runs in a browser)
npm run tauri dev # Full desktop app (frontend + Rust shell)
npm run build # Type-check and build the production frontend
npm run preview # Serve the production frontend build locally
npm run test # Run the unit test suite (Vitest)The conversion engine lives in
src/utils/conversions.ts and is plain,
dependency-free TypeScript — it behaves identically in a browser and inside
the Tauri webview, which makes it easy to test in isolation.
D2d ships with 100+ unit tests covering every conversion function. Run them with:
npm run testSee TESTING.md for coverage details and conventions.
D2d/
├── .github/ # GitHub Actions release workflow
├── src/ # React + TypeScript UI
│ ├── components/ # Navbar, Sidebar, UpdateDialog
│ ├── contexts/ # Theme (dark/light) context
│ ├── pages/ # Home, Converter, Multi-Format, About
│ └── utils/ # Conversion engine, explanations, clipboard, updater
├── src-tauri/ # Rust shell, Tauri config, icons, Android project
├── scripts/ # Release version-bump script
├── docs/ # Maintainer documentation (RELEASING.md)
├── public/ # Static assets (logos, fonts)
└── dist/ # Production frontend build output
- Build failures — reinstall dependencies (
npm ci), update the Rust toolchain (rustup update), and confirm platform build tools are present. - Blank window on
tauri dev— make sure the Vite dev server port1420is free; D2d uses a fixed, strict port. - Android build issues — verify
ANDROID_HOME, the NDK path, and JDK 17 are set as described in the Tauri Android guide.
Contributions are welcome. Please read CONTRIBUTING.md before opening an issue or pull request — it covers the workflow, coding standards, and how to add a new conversion. Conventional commits, tests, and linted code help us review quickly.
Maintainers cutting a release: see docs/RELEASING.md.
Released under the MIT License.
- Issues: https://github.com/inowio/D2d/issues
- Discussions: https://github.com/inowio/D2d/discussions
- Email: info@inowio.in
Inowio Technologies LLP – From Bits to Machines. https://inowio.in