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# easy-png-tools
Browser-based PNG utility toolkit — no server, no data upload, everything runs locally.
Browser-based PNG utility toolkit — no server, no data upload, everything runs
locally.
Inspired by online services like onlinepngtools.com, but fully offline-capable and open source.
Inspired by online services like onlinepngtools.com, but fully offline-capable
and open source.
## Features
- **Pixel-level image processing** — format conversion, transparency/alpha channel, color transformations, geometry, filters/convolutions, morphology, quantization & palettes, image generation, text/watermarks, analysis & checks
- **Pipeline system (workspace)** — load image → chain multiple tool steps → sequential application → download result; pipelines saved to localStorage, exportable as JSON
- **Web Worker execution** — heavy operations run off the main thread with automatic fallback to direct calls
- **Pixel-level image processing** — format conversion, transparency/alpha
channel, color transformations, geometry, filters/convolutions, morphology,
quantization & palettes, image generation, text/watermarks, analysis & checks
- **Pipeline system (workspace)** — load image → chain multiple tool steps →
sequential application → download result; pipelines saved to localStorage,
exportable as JSON
- **Web Worker execution** — heavy operations run off the main thread with
automatic fallback to direct calls
- **i18n** — full Russian and English localization with search matching
- **Dark/Light themes** — persisted to localStorage
- **Pure TypeScript core** — `lib/core/` operates on `ImageData`/`Uint8ClampedArray` with no DOM dependency
- **~30+ tools** across categories: transparency, color, geometry, filters, morphology, palettes, generation, text, analysis
- **Pure TypeScript core** — `lib/core/` operates on
`ImageData`/`Uint8ClampedArray` with no DOM dependency
- **~30+ tools** across categories: transparency, color, geometry, filters,
morphology, palettes, generation, text, analysis
## Tech Stack
- **SvelteKit** (Svelte 5, runes mode) with static adapter — pure static export, no server
- **SvelteKit** (Svelte 5, runes mode) with static adapter — pure static export,
no server
- **Vite** + **TypeScript** (strict)
- **Vitest** for unit tests
- **ESLint** + **Prettier**
@@ -46,14 +56,15 @@ Static output is written to `web/build/`.
### Other Commands
| Command | Description |
| ------------------------ | ------------------------- |
| `pnpm --dir web test` | Run unit tests (Vitest) |
| `pnpm --dir web check` | Type-check (svelte-check) |
| `pnpm --dir web lint` | Lint (ESLint) |
| `pnpm --dir web format` | Format code (Prettier) |
| `pnpm format:docs` | Format docs (Prettier) |
| `pnpm --dir web preview` | Preview production build |
| Command | Description |
| ------------------------ | ------------------------------ |
| `pnpm verify` | Run the full fast quality gate |
| `pnpm --dir web test` | Run unit tests (Vitest) |
| `pnpm --dir web check` | Type-check (svelte-check) |
| `pnpm --dir web lint` | Lint (ESLint) |
| `pnpm --dir web format` | Format code (Prettier) |
| `pnpm format:docs` | Format docs (Prettier) |
| `pnpm --dir web preview` | Preview production build |
## Project Structure
@@ -75,13 +86,18 @@ easy-png-tools/
## Architecture
The project is built around a **tool registry** (`registry.ts`) — each tool is a self-contained entry with `{id, title, description, category, params, run}`. Pages, forms, and pipelines are generated from this registry.
The project is built around a **tool registry** (`registry.ts`) — each tool is a
self-contained entry with `{id, title, description, category, params, run}`.
Pages, forms, and pipelines are generated from this registry.
Core image processing lives in `lib/core/` and operates directly on `ImageData` objects with no browser API dependencies, making it portable to other environments (WASM, CLI) in the future.
Core image processing lives in `lib/core/` and operates directly on `ImageData`
objects with no browser API dependencies, making it portable to other
environments (WASM, CLI) in the future.
## Roadmap
See [docs/roadmap.md](docs/roadmap.md) for the full development plan. Current phases:
See [docs/roadmap.md](docs/roadmap.md) for the full development plan. Current
phases:
1. **Phase 1** — TypeScript core + web UI (in progress)
2. **Phase 2** — Rust/WASM core for performance-critical operations