Merge PDF Files
Online for Free
Combine multiple PDF files into one. Reorder pages, remove unwanted pages, add images — all in your browser. Your files never leave your device.
Opens in Culacc dashboard · No account required for guest use
Features
Everything you need to merge PDFs
100% Private
All processing happens in your browser. Your PDF files never leave your device and are never uploaded to any server.
Drag to reorder
Drag and drop file cards to change the order of documents. Reorder individual pages in the Pages tab.
Page-level control
See thumbnail previews of every page. Remove specific pages you do not want included in the final PDF.
Add images
Upload JPG, PNG, and other images alongside PDFs. Images are automatically converted to PDF pages.
Insert between files
Add new files between existing ones — not just at the end. Perfect for inserting a cover page or addendum.
Instant download
Merging happens in seconds. Download the combined PDF immediately — no waiting, no email link.
Your PDFs Are Processed Locally — Never Uploaded to Any Server
Culacc's PDF merger uses PDF-lib and PDF.js — open-source JavaScript libraries that run directly in your browser. When you upload PDFs, they are loaded into your browser's memory and processed entirely on your device. The merged PDF is generated locally and downloaded directly to your computer. No file ever touches our servers. This makes it safe for sensitive documents — contracts, legal files, medical records, financial statements.
How to Merge PDFs
Combine PDF files in 3 steps
No software to install. Works on any device. Drag and drop interface.
Upload your PDFs
Drag and drop multiple PDF files or click "Choose Files." Images (JPG, PNG) are also supported and auto-converted to PDF pages.
Arrange and edit
Drag file cards to reorder documents. Switch to Pages tab to reorder or remove individual pages using thumbnail previews.
Download merged PDF
Click Download. The merged PDF is created in your browser and saved instantly. No waiting — the merge takes seconds.
Use Cases
When do you need to merge PDFs?
Combine reports and chapters
Merge separate chapters, sections, or reports into one complete document for sharing or printing.
Add a cover page
Insert a cover page, table of contents, or appendix at any position in an existing PDF.
Combine invoices and receipts
Merge monthly invoices or expense receipts into a single PDF for accounting or tax filing.
Assemble contracts
Combine a signed contract with its annexes, exhibits, and amendments into one PDF file.
Academic submissions
Merge thesis chapters, bibliography, appendices, and cover sheet into a single submission file.
Print-ready documents
Combine multiple documents for a single print job — saving time and ensuring correct page order.
Why Browser-Based PDF Merging is Better
Most online PDF mergers upload your files to a remote server, merge them there, and send the result back. This means your documents — which may contain sensitive personal or business information — pass through a third party's systems and may be stored temporarily or permanently.
Culacc's PDF merger uses PDF-lib, a pure JavaScript library that runs entirely in your browser. When you upload files, they are loaded into your browser's memory only. The merge happens locally using your device's CPU. The resulting PDF is created in your browser and downloaded directly — the merged file never exists on any server.
This is particularly important for confidential documents: legal contracts, medical records, financial statements, HR documents, or anything you would not want stored on a stranger's server. Browser-based processing eliminates that risk entirely.
FAQ
Frequently asked questions
Everything about merging PDF files online for free.
More Tools
Related free tools
Store your merged PDFs in the cloud
Culacc gives you 5 GB free cloud storage. Upload, share, and access your PDFs from any device — with the PDF merger built into your dashboard.
Create Free Account — 5 GB StorageNo credit card required · EU servers · GDPR compliant