How many files can I merge?

There is no set limit. Files with hundreds of pages merge too; the time depends on your device.

Does compression lower the quality?

Compression re-encodes the pages at the resolution you choose. 120 DPI is enough for on-screen reading; pick 150-200 DPI for print.

Pick an action and drop your files. Each file is processed in turn and the results download as one ZIP.

Merge, split and compress PDFs. Apply the same job to hundreds of files at once.

Batch ProcessingApply the same operation to many PDFs at once: compress, rotate, number, watermark or write metadata. Results arrive as a single ZIP.
Merge PDFDrag to reorder multiple PDF files and merge them into a single document.
Split PDFExtract, delete or split selected pages from a PDF, or save every page as its own file.
Compress PDFShrink a PDF right in your browser. You choose the quality and the resolution.
Protect PDFAdd an open password to a PDF and restrict printing, copying and editing. AES-256 encryption, entirely in your browser.
Unlock PDFRemove the password from a PDF you have the password for, and lift printing and copying limits. Nothing is uploaded.
Compress ImageShrink an image's file size with quality and resolution controls, and compare the before/after.

How many files can I merge?: There is no set limit. Files with hundreds of pages merge too; the time depends on your device.
Does compression lower the quality?: Compression re-encodes the pages at the resolution you choose. 120 DPI is enough for on-screen reading; pick 150-200 DPI for print.
How does batch processing work?: Pick an action and drop your files. Each file is processed in turn and the results download as one ZIP.