Merge PDF Online

Combine multiple PDF files into a single document. Upload your PDFs, drag to reorder, and merge in seconds – no watermark, no registration.

Is it free to merge PDF files?
Yes, completely free. No sign-up, no watermark, no subscription. Merge as many PDFs as you want at no cost.
How many PDF files can I merge at once?
You can merge as many files as your browser can handle - typically 20-50 or more. There is no server-side limit.
Does merging PDFs reduce quality?
No. Merging copies pages exactly as they are without any re-encoding or quality loss.
Does it add a watermark to the merged PDF?
Never. The output PDF is clean - no watermark, no branding, no modifications from CompressPDF.
Can I reorder pages before merging?
Yes. After uploading your files, drag and drop them to set the order you want before clicking Merge.
Can I merge password-protected PDFs?
No, the files must be unlocked first. Remove the password from your PDFs before uploading.
Are my files uploaded to a server?
No. All merging happens locally in your browser. Your files never leave your device.