PDFzen — Private PDF & Image Tools by chengjian

PDFzen is a free, open-source toolkit that runs 100% in your browser. Merge, split, compress, convert, sign, and edit PDFs and images — every file is processed locally on your device. Nothing is ever uploaded, stored, or shared.

• Private by design — your files never leave your computer. No servers, no accounts, no tracking.
• Works offline — once loaded, tools run without an internet connection.
• No sign-up — open the popup and start immediately.
• Open source — code is public and auditable.

Open the PDFzen web toolkit from your toolbar to merge PDFs, compress to a target size, convert between formats, add text or signatures, and more. Ideal for resumes, contracts, and everyday documents where privacy matters.

Source: https://github.com/chengjian3456-hue/pdfzen-extension