The complete PDF toolkit — all in your browser, all free, all private.
PDFStack brings together the 30+ most-used PDF operations into a single, fast, ad-free web app. Every tool runs entirely in your browser using pdf-lib and PDF.js — your documents never leave your device, no signup or email is required, and there's no upload progress bar to wait for. Whether you need to merge PDF files, compress a large attachment, sign a contract, redact sensitive data, or convert between PDF, Word, PowerPoint, Excel, and image formats — PDFStack handles it instantly and privately.
PDF Essentials
Combine, separate, shrink, and reorganise PDFs in seconds.
Convert to PDF
Turn any document into a clean, shareable PDF.
Convert from PDF
Extract content from PDFs into editable formats.
Edit, Sign & Annotate
Add content and finalise documents without expensive software.
Security & Privacy
Protect sensitive documents with proper encryption and redaction.
Smart Tools
AI-assisted and intelligent document operations.