Toolzaio PDF Merge
Add two or more PDF files, put them in the order you want, and download a single combined PDF. Your files never leave your device.
Drop PDF files here, or click to choose them
Add as many as you like. Nothing is uploaded — the merging happens on your device.
No files yet. Add at least two PDFs to merge them.
How it works
The merger opens each PDF you add, copies every page into one new document in the order shown in the list, and hands you the combined file. Use the up and down arrows to rearrange files before you merge. Page order inside each file stays exactly as it was.
All of this runs inside your browser using an open-source PDF library. Your documents are read by your own device and the merged file is created there too, so contracts, bank statements and ID scans are never sent to a server. That privacy is the main reason this tool is built this way.
Two honest limits. A password-protected PDF cannot be opened, so it cannot be merged until the password is removed elsewhere. And the merged file is roughly the size of all the parts added together; this tool joins files, it does not compress them.
Questions people ask
Are my PDFs uploaded anywhere?
No. The files are opened and merged by code running in your browser tab. You can check by loading the page, going offline, and merging anyway.
Can I change the order of pages inside one PDF?
This tool orders whole files, not individual pages. Put your files in the sequence you want with the arrows; pages within each file keep their original order.
Why did one of my files fail to load?
It is usually either password protection or a damaged file. The merger tells you which file failed so you can leave it out and merge the rest.
Is there a limit on file size or count?
There is no limit set by us. The practical limit is your device's memory, since everything happens locally. Very large sets of PDFs merge more smoothly on a laptop than on an older phone.
More tools
Word Counter
Count words, characters and reading time instantly.
Case Converter
Switch text between UPPER, lower and Title case.
Password Generator
Strong random passwords, made on the spot.
Age Calculator
Your exact age in years, months and days.
Background Remover
Remove a photo background in one click, free.
Image Compressor
Shrink JPG and PNG files without losing quality.
Passport Photo Maker
Official-size passport and visa photos at home.
Voice Pitch Changer
Raise or lower the pitch of any audio clip.
QR Code Generator
Make a QR code for any link, text or Wi-Fi.
Image Converter
Change pictures between PNG, JPG and WebP.
Percentage Calculator
Work out percentages, discounts and marks.
BMI Calculator
Check your body mass index in seconds.