Free Client-Side PDF Tools - 100% Private
Merge, split, compress, watermark, and convert PDF documents with 100% local privacy. Every single file operation runs directly inside your local web browser without uploading bytes to our infrastructure or external cloud servers. Enjoy maximum privacy, zero bandwidth lag, and infinite free usage.
All PDF Tools (6)
Organize PDF Pages
All-in-one PDF page studio: reorder, delete, rotate, extract, and split pages in one visual canvas.
Merge PDF
Combine multiple PDF files into a single unified document with custom page order.
PDF Watermark & Page Numbers
Add custom watermark stamps or insert page numbers (header & footer) into your PDF.
PDF ⇄ Images Converter
Convert images (JPG, PNG, WebP) to PDF documents or extract PDF pages to high-resolution images.
Sign PDF
Sign PDF contracts and forms directly in your browser. Draw hand signature, upload stamp image, or type name with cursive font.
Compress PDF
Reduce PDF file size with 3 quality presets (Low, Medium, High) and optional Grayscale conversion.
How 100% In-Browser PDF Tools Work
When you select files in our pdf tools, your browser allocates secure sandbox memory using standard HTML5 APIs. Dedicated WebAssembly routines and background Web Worker threads parse and transform your media entirely on your computer's CPU/GPU.
File streams are read directly from disk into typed array buffers in RAM without dispatching HTTP POST requests.
Algorithms execute in isolated Web Workers to prevent main UI freezing and protect sensitive data.
Processed outputs generate temporary blob URLs for instant saving, automatically reclaimed after download.
Frequently Asked Questions: PDF Tools
Explore Other Categories
Image Tools
Resize, crop, compress, convert, and batch process images with high-performance local canvas.
- High-speed Canvas API and OffscreenCanvas hardware acceleration
- Smart lossy and lossless image compression
OCR Tools
Extract text from scanned documents, photos, and PDFs with client-side AI OCR.
- Tesseract.js OCR engine running in dedicated Web Workers
- Multi-language support including English, Vietnamese, Spanish, French, and more
Text Tools
Format, clean, compare, convert case, and analyze text files safely in your browser.
- Zero latency real-time string manipulation
- Detailed readability and speaking/reading time analytics
Security & Crypto
Generate secure keys, inspect tokens, compute hashes, and encrypt text with Web Crypto.
- Native Web Crypto API hardware acceleration running 100% locally in your browser
- Zero server transmission - confidential tokens, passwords, and private text never leak
Lifestyle & Calendar
Explore the traditional Vietnamese Tam Tong Mieu calendar, calculate auspicious hours, and look up 64 I Ching hexagrams with zero server tracking.
- Accurate Vietnamese lunar calendar, can chi, solar terms, and auspicious hours
- Full 64 I Ching hexagram calculation by phone number or date
Video Tools
Convert, trim, compress, and extract audio from video files locally with WebAssembly FFmpeg.
- 100% local processing with WebAssembly FFmpeg engine
- Convert between popular formats: WMV, MP4, WebM, AVI, MOV, MKV, and GIF