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> Writing code, shipping tools, watching open source — keeping what is useful _
RSS FeedSelf-built online developer tools for formatting, image processing, QR codes, network lookup and developer utilities, all processed locally in your browser.
Online JSON formatting, validation and beautification tool with syntax highlighting, error location, compression, statistics, tree view and mind map visualization for API debugging, config inspection and complex data reading.
Online HTML formatting and beautification tool for indentation, minification, preview and structure cleanup, helping frontend developers debug pages, analyze snippets and maintain template code more efficiently.
Online XML formatter for beautifying, minifying, validating and converting XML to JSON, with error tips that help developers inspect API responses, review configuration files and transform structured data quickly.
All-in-one developer utilities: base conversion, UUID generation, MD5/SHA hashing, Base64 codec, timestamp conversion, URL encoding and random string generation. Runs locally in your browser.
Online QR code generator supporting text, URLs, email, phone and WiFi content, with instant high-quality QR code creation, customizable size and error correction for sharing links, contact details and network information.
Image compressor for JPEG, PNG and WebP files that reduces file size while preserving visual quality, supports batch processing and local browser-side handling for web image optimization and upload preparation.
IP lookup tool for checking your public IP address, geolocation, ISP details, network connection status and browser network information, plus manual IP queries for troubleshooting, access diagnostics and development debugging.
Online Markdown editor with real-time preview, syntax highlighting, quick toolbar actions, rich-text copy and Word export, useful for drafting documentation, organizing notes, previewing formatting and creating shareable content.
Convert numbers between binary, octal, decimal and hexadecimal bases for development and low-level debugging.
A showcase of products I build and maintain, including Chrome extensions, desktop apps, and online tool websites.
First Public Release
Turn complex web documentation into exportable Markdown
A Chrome extension for restructuring complex web documentation with TOC preservation, local history, and merged Markdown export.
Public Pages
Public pages, asset references, and store profile details now point to one consistent project entry.
New Release
Paste AI responses with perfect formatting
One-click rich-text copy for AI outputs. Renders perfectly in Feishu, Word, Notion and email, with searchable local history.
Public Pages
Zero data transmission — all local. Ideal for office workers, content creators, and developers who paste AI output daily.
Desktop App
Workspace
Bind project directories and reduce path switching.
Launcher
Launch opencode, codex, and claude code from one place.
Sessions
Scan local session history and build an index.
The current release focuses on local-first boundaries: SQLite, local scanning, and no system proxy changes.
New Desktop Workflow
Put AI CLI workspaces, launchers, and session history into one desktop app
A local-first desktop app for multi-repo developers to manage workspaces, CLI launchers, proxy injection, launch history, and indexed local sessions.
Public Pages
Built around local-first boundaries: no system proxy changes, no rewriting original session files, and a better workflow for `opencode`, `codex`, and `claude code`.
Desktop App
Generate
Create QR codes from text, URLs, Wi-Fi, vCards and more.
Scan
Decode QR codes from image files, screen capture, or clipboard.
Offline
No ads, no tracking, offline-friendly with local history.
Microsoft Store
A clean, fast QR code tool for Windows
A Windows QR generator and scanner for text, URLs, Wi-Fi, vCards and more, with file and screen scanning, no ads, and offline support.
Public Pages
Available on Microsoft Store with PNG/SVG export, batch generation, clipboard decoding, and local history.
Web App
Instant
Start writing immediately with no sign-up required.
Local
Notes stay in browser-local storage for privacy.
PWA
Install as a PWA and use it like a native app.
Web App
A lightweight note app that is ready the moment you open it
A lightweight online note-taking tool for quick ideas, todos, and text snippets with instant access, offline support, and browser-local storage.
Live Site
quicknote.zhoudw.vip/QuickNote
Web App
Everything stays in the browser with no sign-up required, and PWA install support makes it easy to keep notes one click away.
Web App
Local
APK parsing happens locally in the browser with no uploads.
Metadata
Inspect package name, version, permissions, and app metadata.
Flexible
Optional parsing controls for MD5, icons, and certificates.
Web App
Inspect APK package metadata locally in your browser
An online APK inspector that parses package metadata, certificates, and icons locally after you drop an APK file into the browser.
Live Site
apk.zhoudw.vip/APK Lens
Web App
Useful for Android debugging, package inspection, and quick APK metadata checks without uploading files to a server.
dub, 2025's popular open-source link attribution platform, redefines URL shortener management & conversion tracking. TypeScript-built with 22k+ stars, widely adopted by Twilio, it integrates URL shortening, conversion tracking & attribution analytics, addressing data fragmentation & inaccuracies to empower marketing teams with data-driven decisions.
DeepFaceLab 2025 full tutorial: Complete guide for beginners to learn video face replacement. This open-source tool based on TensorFlow and CUDA acceleration helps master high-quality face synthesis techniques, ideal for digital creators to quickly get started with deepfake applications.
Build end-to-end type-safe TypeScript apps instantly with better-t-stack 2025. This TS CLI tool simplifies setup with minimal templates & latest dependencies for type-safe development.
The Anchor Solana framework simplifies Solana program development, emerging as the leading tool for building Solana smart contracts in 2025. With 4557 GitHub stars and 1663 forks, it streamlines development through intuitive tools, making Solana programming more accessible. Enhance your Solana dApp development workflow with this essential framework.
Firecracker, AWS's open-source Rust-written microVM, powers modern serverless computing (e.g., Lambda, Fargate). It solves the critical isolation vs. performance trade-off in serverless/container scenarios, delivering secure, fast startup with robust isolation while maintaining performance—emerging as the backbone of serverless infrastructure.
The tldraw whiteboard SDK equips 2025 React developers to build powerful infinite canvas experiences, featuring a robust React whiteboard component with TypeScript support. As a leading solution with 41,700+ GitHub stars, it simplifies creating intuitive visual collaboration tools, merging infinite canvas flexibility with React's efficiency. Ideal for modern digital collaboration needs, this SDK streamlines development of next-gen whiteboard applications.
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