Merge PDF
Combine multiple PDF files into one document instantly. Secure, fast, and free online PDF merger. Drag and drop reordering supported.
Upload your files
Drag and drop your files here, or click to browse
Supported formats: application/pdf
Max file size: 50 MB
Max files: 20
Why Use Our PDF Merger?
Professional tools made simple. Combine your documents with confidence.
100% Secure
Your files are processed securely using SSL encryption and are automatically deleted from our servers after 24 hours.
Drag & Change Order
Easily reorder your PDF files before merging. Just drag and drop to arrange them exactly how you want.
Super Fast
Our optimized processing engine combines your PDFs in seconds, no matter how many files you have.
Works Everywhere
Use our PDF merger on any device - Windows, Mac, Linux, Android, or iOS. No software installation needed.
Top Quality
We preserve the quality, formatting, and layout of your original documents during the merge process.
Free & Limitless
Merge as many PDFs as you need. No daily limits, no hidden costs, and no watermarks.
How to Combine PDF Files
Upload Files
Click 'Select PDF Files' or drag and drop your documents into the upload box. You can select multiple files at once.
Arrange Order
Use the up/down arrows or simply drag and drop the files in the list to rearrange them into your desired order.
Merge & Download
Click the 'Merge PDF Files' button. Wait a few seconds for processing to finish, then download your single combined PDF file.
Frequently Asked Questions
Is it really free?
Yes, our PDF Merger is 100% free to use. You don't need to create an account, pay a subscription, or deal with restricted features.
Does it work on Mac and Mobile?
Absolutely. ImageOptimizer.in works in your web browser, making it fully compatible with Mac, Windows, Linux, iPhone, and Android devices.
How many files can I merge at once?
You can currently merge up to 20 PDF files in a single session. Each file can be up to 50MB in size.
Are my files private?
Security is our top priority. We use SSL encryption for transfers, and all uploaded and merged files are permanently deleted from our servers after 24 hours.