100% local: total privacy

Merge PDFs online. In one click.

Combine multiple PDFs into a single file directly in your browser, free and with no account required, for maximum privacy. Your documents never leave your computer: no server, no upload.

Why use CocoonPDF

How it works

Drop several PDFs, reorder them if needed with the arrows, and download the merged file a few seconds later.

Fully customizable order

Every file you add can be moved earlier or later using its thumbnail: the order shown on screen is exactly the order of the final PDF.

Simple to use

No account to create, no software to learn: drop your files, reorder if needed, click Merge. That's it.

Works on all your devices

CocoonPDF runs entirely in your browser: Windows, macOS, Linux, iPhone, or Android, no version to install for your system.

No install, no server

Unlike typical "online" tools, your files are never sent to a server to be merged: all the processing happens directly on your device.

Privacy by design

Since nothing ever leaves your device, there's nothing to store or later delete from a remote server: your documents stay with you, from the first byte to the last.

How to merge PDFs without losing quality: the complete guide

Merging PDFs means combining several files into a single document, in the order you choose. Unlike a conversion, no page is altered: here's what actually happens, and how to get the most out of the tool.

What actually happens when you merge

CocoonPDF copies every page from the source files exactly as it is into a new document, without recompressing or redrawing it: text stays sharp and selectable, images keep their original quality. The final file therefore weighs roughly the sum of the input files, never less: if the result is too heavy to send, it needs compressing afterward, not before.

Page order: the only thing that matters

The arrows on each thumbnail move the file left or right in the list: the order shown on screen, left to right, will be exactly the page order in the final PDF. There's nothing else to configure: no layout choices, no format handling, just the assembly order.

Real-world use cases

Putting together a job application (résumé, cover letter, scanned diplomas) into a single file to send. Combining several separately scanned pages into one document. Bundling a month's worth of invoices into a single archive before handing them to an accountant. In every case, merging avoids having to open a full PDF editor for such a simple task.

Limits worth knowing: bookmarks and metadata

The final document doesn't automatically rebuild a unified table of contents from each source file's bookmarks: those aren't carried over. The final file's metadata (title, author) also starts fresh rather than inheriting it from one of the source files. None of this affects what's visible on the pages themselves, only the information attached to them.

Merge, then compress: the right move before sending

If the merged file ends up over your email's size limit, the simplest fix is to download it and then drop it into CocoonPDF's Compress tool: both tools are built to chain together without ever needing another piece of software.

Frequently asked questions

Are my PDF files sent to a server?

No. All merging happens right in your browser: no file is ever sent to or stored on a server. You can verify this yourself: open your browser's developer tools (F12), Network tab, before merging.

Is CocoonPDF really free?

Yes: no account, no limit on the number of files, and no watermark on the PDF you produce. The site is funded by a small ad shown on the page.

In what order are the PDFs merged?

In the order shown on screen: the first file in the list becomes the start of the final PDF, the last one becomes the end. Use the arrows on each thumbnail to reorder files before merging.

How many PDFs can I merge at once?

As many as you like, as long as each file is 100 MB or smaller. Since processing happens entirely in your browser, the real speed also depends on your device's available memory.

Does merging change the content or quality of the PDFs?

No: merging PDFs only assembles their existing pages into one file, with no recompression or quality loss. Each page's content stays exactly as it was in the original.

Does it work on mobile?

Yes, right in your browser (Chrome, Safari...), no app to install.