I Built Afreeofflinepdf Imagetoolkit 15tools Dev Community
The "Why" If you are a developer, you probably hate uploading sensitive documents (tax forms, contracts, bank statements) to random "Free PDF Merger" websites. You know that "Free" usually means "You are the product." I wanted a tool that: - Runs 100% locally (files never leave the browser). - Is Open Source (so I can verify the code). - Doesn't suck (clean UI, no ads, no "3 files per day" limits). So, I built PDFCraft. It's an MIT-licensed, client-side PDF toolkit built with Next.js and WebAssembly.
The Tech Stack I chose a modern stack to ensure performance and maintainability: - Frontend Framework: Next.js (React). I needed the static site generation (SSG) capabilities for SEO and fast initial load times. - Styling: Tailwind CSS. For a clean, responsive UI that works on mobile. - Core Engine (The Heavy Lifting): - WebAssembly (Wasm): This is key. It allows us to run heavy image and PDF processing logic in the browser at near-native speed. - Libraries: pdf-lib for manipulation,pdf.js for rendering, andtesseract.js for client-side OCR.
Architecture: Zero-Server Processing The most interesting part of PDFCraft is what it doesn't have: A backend API for file processing. In a traditional architecture: User Uploads File -> Server (AWS/GCP) Processes it -> User Downloads In PDFCraft: User Selects File -> Browser (Wasm/WebWorkers) Processes it -> User Downloads Why this matters for devs: - Privacy: I literally cannot see your files. There is no database to hack. - Cost: Hosting is dirt cheap (static files only). - Speed: No network latency for uploading large files.
Key Features Implemented It started as a simple merger but grew into a suite of 80+ tools. Here are a few technical highlights: - Client-Side OCR: Using tesseract.js and Web Workers to extract text from scanned PDFs without freezing the main thread. - Conversion: Converting PDF to Office formats (Word/Excel) and Images (JPG/PNG/HEIC) directly in the browser. - Security: AES encryption/decryption handling purely on the client. Self-Hosting & Extension Since privacy is the main goal, I made sure you can run it yourself.
You can clone the repo and deploy it anywhere (Vercel, Netlify, or your own Docker container). I also included a Chrome Extension (you can find the zip in the repo) for quick access without opening a new tab. Open Source & Roadmap The project is fully open source (MIT License). I'm currently looking for contributors to help with: - Improving the PDF Viewer performance for huge files (500MB+). - Adding more language support for OCR. If you are interested in WebAssembly or PDF manipulation, check out the code!
🔗 GitHub: https://github.com/PDFCraftTool/pdfcraft (If you find it useful, a star ⭐ would keep me motivated!) Top comments (3) I did tried and it works. good job Love this project! Do you have any plans to add a feature to sign PDFs with a digital ID in the future? Some comments may only be visible to logged-in visitors. Sign in to view all comments.
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