What is a PDF Merger?
A PDF merger is a tool that combines multiple PDF files into a single document. Instead of juggling several separate files, you can merge them into one organized PDF. This is useful for combining reports, merging scanned documents, compiling chapters into a book, or assembling presentation materials.
Our PDF merger goes beyond simple file concatenation. It extracts each page from your uploaded PDFs and displays them as thumbnails, giving you full control over the final document. You can reorder pages by dragging them, remove unwanted pages, and even edit individual pages by adding titles, borders, images, or redacting content — all before merging. Every operation runs entirely in your browser, so your files never leave your computer.
Why Merge PDFs in Your Browser?
Traditional PDF merging often requires uploading files to a server, which raises privacy concerns and adds upload and download wait times. Our tool processes everything client-side using WebAssembly-powered PDF libraries, so your documents stay on your device.
This means no file size limits, no server queues, and no privacy risks. Whether you are merging sensitive legal documents or large presentation files, the processing happens instantly on your own machine. The page-level preview and editing features let you fine-tune the output before finalizing, saving you from having to edit the merged document afterward.
How to Use the PDF Merger
Upload Your PDFs
Drag and drop PDF files onto the upload zone or click to select them. Each page from every PDF is extracted and shown as a clickable thumbnail preview.
Arrange & Edit
Drag pages to reorder them. Click the Edit button on any page to add a title, draw a border, overlay images, or redact sensitive content. Remove pages you do not need.
Merge & Download
Click the Merge button to combine all pages into a single PDF in your chosen order. Download the result instantly — no server upload required.
Features
Page Previews
Every page is rendered as a thumbnail so you can see exactly what you are merging before you combine them.
Drag-and-Drop Reordering
Rearrange pages by simply dragging them into the desired position. No need for up and down buttons.
Page Editing
Add titles, borders, redactions, and image overlays to individual pages before merging.
100% Browser-Based
All processing happens locally with pdf-lib and PDF.js. Your files never leave your computer.
No File Size Limits
Since nothing is uploaded to a server, you can merge PDFs of any size without restrictions.
Free & Private
No registration, no ads, no tracking. Your documents stay completely private.
Frequently Asked Questions
How do I merge PDF files?
Upload your PDF files by dragging them onto the upload zone or clicking "Select PDF Files". Each page appears as a thumbnail. Drag pages to reorder them, hover and click X to remove unwanted pages, and click Edit to customize individual pages. Once you are satisfied, click the "Merge" button to combine them into one PDF.
Is my data safe? Will you see my files?
Absolutely not. All processing is done entirely in your browser using client-side JavaScript libraries. Your files are never uploaded to any server. This means your documents stay private and secure on your own computer at all times.
Can I merge more than two PDFs?
Yes. You can upload and merge any number of PDF files in a single session. There is no limit on the number of files or pages you can combine.
Can I change the order of pages?
Yes. Simply drag any page thumbnail to a new position in the grid. The order of pages in the grid determines their order in the merged PDF. You can also remove individual pages you do not want to include.
What editing is available for individual pages?
Click the Edit button on any page to open the editor. You can add a title with custom font size and color, draw a colored border around the page, upload image overlays (PNG, JPG, GIF, WebP) positioned at any corner or center, and add white redaction rectangles to cover up sensitive text.
Are there any file size limits?
No. Since files are processed locally in your browser, there are no file size limits. However, very large files may take longer to process depending on your device's performance.
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