PureTools

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PureTools is a lightweight, privacy-first, pure-frontend toolkit for developers. Core processing happens locally in the browser with no application backend; individual tools may read clearly identified public reference data.

Highlights

• Pure frontend, no backend required
• Privacy-first: data never leaves your device
• Dark/light mode with system sync
• Four navigation groups with a compact, scrollable Tools menu and global / search

Tools

• UUID Generator (RFC 4122 v4): generate, validate, history, copy
• Random String Generator: email-prefix-friendly presets, batch generation, copy, history
• JSON Formatter: format, minify, validate, escape/unescape, syntax highlight, line numbers, copy
• SQL Formatter: format/minify, basic validation (strings/parentheses), line numbers, copy
• Markdown Previewer: local CommonMark or Enhanced preview with GFM, math, Mermaid, and safe static HTML
• Local Translator: private on-device translation with language detection and model download progress
• Regex Tool: validate, test, highlight matches, generator templates
• CRON Tool: 5-field CRON validator and generator
• Base64 Tool: encode/decode, URL-safe mode
• URL Encoder: encode/decode (component/full URL)
• QR Code Generator: generate and download QR codes from exact plain-text input
• JWT Decoder: header/payload decode, time claim insights
• Hash Calculator & Verifier: MD5 and SHA-1/256/384/512 for exact UTF-8 text and local files, checksum comparison, chunked progress and cancellation
• Timestamp Tool: timestamp <-> local datetime, seconds/milliseconds, local + UTC outputs, copy
• Time Zone Converter & World Clock: IANA regions, fixed PST/PDT offsets, explicit DST overlap/gap handling, live city clocks with saved preferences
• GitHub CDN: convert GitHub/raw links to raw + jsDelivr URLs, copy
• Reference exchange rates: read public reference rates while keeping amounts, conversion, and caching local

Tech Stack

• SvelteKit (Svelte 5 Runes) + Vite
• TypeScript (strict)
• Tailwind CSS v4
• Biome (lint/format)
• Cloudflare adapter (deployment target)

Local Development

1. Install dependencies:

bun install

2. Start the dev server:

bun run dev

Scripts

• bun run dev: start dev server
• bun run build: build for production
• bun run preview: preview production build
• bun run test: run unit and browser end-to-end tests
• bun run test:unit: run Bun unit tests
• bun run test:e2e: run Playwright browser tests
• bun run test:exchange-rate:live: verify the live rate API, CORS policy, and response contract
• bun run check: type-check and sync
• bun run lint: lint + type-check
• bun run lint:fix: auto-fix lint issues
• bun run format: format code
• bun run cf:dev: run Wrangler local dev
• bun run cf:deploy: deploy to Cloudflare Workers

Notes

• Core processing runs locally in the browser and user input is not uploaded; the exchange-rate tool only downloads a public rate table.
• /hash keeps SHA-256 as the default. Nonempty text is calculated after a 250 ms debounce; use Calculate for empty text or a selected/dropped single file. Expected checksums accept outer whitespace and either hex case; editing them only compares the existing result.
• Hashing never uploads or persists text, files or expected checksums. SHA text uses Web Crypto (HTTPS or localhost); MD5 text and all file algorithms use locally bundled, lazy-loaded hash-wasm 4.12.0 (MIT license, zero runtime dependencies). Files are read as raw bytes in sequential 4 MiB slices in a dedicated Web Worker; cancel, source changes and navigation terminate it. Browsers must support Workers, Blob slice/arrayBuffer and WebAssembly for files; unsupported environments show an error. There is no whole-file fallback or unlimited file-size guarantee: browser/device resources and processing time still apply. Input data stays in page memory only.
• Matching hashes do not establish a trusted source. MD5 has collision weaknesses and is unsuitable for password storage, security signatures or protection against malicious tampering. Prefer SHA-256.
• Local Translator requires desktop Chrome 138 or later. Translation models are downloaded and managed by Chrome on demand.
• Playwright uses the bundled Chromium binary on Linux x64. Linux arm64/other architectures, macOS, and Windows use Playwright's native browser installation; run bunx playwright install chromium once before bun run test:e2e on those platforms.

Brand Assets

• Generated high-resolution logo original
• Production logo
• Generation prompt
• Refinement prompt

License

This project is licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0-or-later). See the LICENSE file for details.