Merge & Split PDF Files in Your Browser
The privacy-first PDF toolkit. No upload required — all processing happens locally on your device.
Trusted by 50,000+ users monthly
What is PDFMK?
A privacy-first PDF utility that works entirely in your browser
Unlike traditional online PDF tools that upload your files to remote servers, PDFMK — your free PDF editor — processes everything locally using modern WebAssembly technology. Merge small PDF files, edit PDF documents, and split pages while your sensitive data remains completely private.
How It Works
Three simple steps
Select Your Files
Drag and drop your PDF files or click to browse.
Choose Operation
For splitting, choose your preferred method.
Download Result
Click the button and your processed PDF downloads instantly.
Why Choose PDFMK?
Privacy-focused, fast, and flexible
Maximum Privacy
Your files stay on your device. No cloud processing means no data breaches.
Instant Results
No uploading, no waiting, no queues. Process your PDFs in milliseconds.
Flexible Pricing
Start with free basic features. Upgrade to premium for advanced tools and unlimited usage.
Features
Everything you need
100% Private
All processing happens locally. Your PDFs never leave your device.
Lightning Fast
Process PDFs instantly using modern WebAssembly technology.
Start Free
Basic features available without registration. Sign up for more capabilities and higher limits.
Works Everywhere
Use on any device - desktop, tablet, or mobile. All modern browsers.
Simple & Intuitive
Drag, drop, and done. No learning curve required.
Multiple Options
Merge multiple PDFs, split by pages or ranges.
Our Tools
Choose your tool
Merge PDFs
PopularCombine multiple PDF files — including small PDF files — into a single document. Free merge PDF tool, perfect for joining chapters, combining reports, and editing PDFs.
Split PDF
Split a PDF into multiple documents. Extract specific pages, separate by page ranges.
Add Watermark
NewPut a watermark on PDF files to protect your documents. Customize text, position, opacity, and color — add watermark on PDF instantly.
FAQ
Frequently asked questions
Is PDFMK free to use?
Basic features are free with reasonable limits. For unlimited access and advanced features, sign up for a free account or upgrade to premium.
Are my PDF files uploaded to your servers?
No, absolutely not. All PDF processing happens entirely within your browser using WebAssembly technology. Your files never leave your device.
What file size limits are there?
Since all processing happens locally, there are no artificial file size limits. The only limitation is your device's memory.
Can I use PDFMK on my phone or tablet?
Yes! PDFMK is fully responsive and works perfectly on mobile devices and tablets.
Do you add watermarks to the PDFs?
No. Unlike many other online PDF tools, we don't add any watermarks or branding to your files.
What browsers are supported?
PDFMK works on all modern browsers including Chrome, Firefox, Safari, Edge, and Opera.
Can I merge small PDF files for free?
Yes! PDFMK is a free PDF editor and merger — you can merge small PDF files, large documents, or any combination at no cost. Since all processing happens locally in your browser, there are no server-side file size restrictions either.
How do I add a watermark on a PDF?
Use our free watermark tool: upload your PDF, enter your watermark text, and customize the position, opacity, and color. Click "Add Watermark" to put the watermark on your PDF and download it instantly — no registration needed.
Ready to get started?
Join thousands of users who trust PDFMK for their PDF needs.