Free Merge PDF

Combine multiple PDF files into one document for free, 100% locally in your browser.

Drag & drop your PDFs here

or browse your files

Supports multiple PDF files

Drag & drop a PDF to split

or browse your files

Single PDF file — limited only by your device memory

Drag & drop a PDF to Sign or Edit

or browse your files

Add signature, initials, or text overlays

Drag & drop a PDF to rotate

or browse your files

Rotate pages clockwise

Drag & drop a PDF to delete pages

or browse your files

Select pages to remove

Drag & drop your images here

or browse your files

Supports JPG, PNG, WebP, GIF, BMP

Secure PDF Merger & Page Combiner

100% Offline Merging

Combine files securely offline. Ideal for legal, corporate, or financial documents containing proprietary or personal information.

Visual Reordering

Drag and drop document thumbnails to change the page sequence before merging, ensuring a perfect visual layout.

No Upload, No Third-Party Processor

No file data is processed on, or transmitted to, external servers — so your document never enters a third party's systems.

Frequently Asked Questions

Can I merge large PDF files here?
Yes. PDFCraft can merge multiple files quickly. The maximum file size depends on your local device's memory since all combining operations run locally on your system.
How do I merge my PDF files securely?
Simply select or drag-and-drop your PDFs, arrange the sequence using our visual editor, and click Merge. The entire process runs inside your browser sandbox with zero uploads.
Does PDFCraft support merging image files too?
Yes, you can use our Images to PDF tool to convert and merge multiple images (like JPG, PNG) into a single PDF document locally.
Is there a limit to how many PDFs I can merge?
There is no software limit imposed by PDFCraft. You can combine as many documents as your browser's local memory can handle.

Step-by-Step Guide Available

Learn how to merge your PDF files offline and privately with detailed instructions.

Read Guide

How merging actually assembles the new file

Merging does not staple two files together. A brand-new, empty PDF is created in memory, and then every page you selected is copied into it along with the object graph that page depends on: its content stream, its embedded font subsets, its images, and its colour spaces. The new document is then written out in one pass.

That copying step explains the one result people find surprising. If your two source files each embed their own subset of the same typeface, the merged file ends up carrying both subsets, because nothing in the process knows the two are related. A merged PDF is therefore often slightly larger than the two inputs added together, and that is normal rather than a sign something went wrong.

What does not survive a merge

  • Bookmarks and outlines are dropped. The outline tree belongs to the document, not to individual pages, so page copying leaves it behind.
  • Internal links can break. A link that pointed to "page 4 of this document" may now land somewhere else entirely, because page 4 of the merged file is a different page.
  • Form fields are unreliable. AcroForm data lives at the document level. If your sources contain fillable forms, check the merged file before relying on it.
  • Encrypted inputs are refused. Remove the password with Unlock PDF first, then merge.
  • Everything is bounded by your tab memory. There is no server to offload to, so a set of files that comfortably exceeds a couple of gigabytes will fail rather than merge slowly.

Merging: the awkward cases

Why is my merged PDF bigger than the files I put in?
Because embedded resources are copied rather than shared. Two files that each embed a subset of the same font contribute two subsets to the output. The merge step does not deduplicate fonts or images across documents.
Can I merge PDFs of different page sizes?
Yes. Each page keeps its own dimensions, so an A4 page and a US Letter page sit side by side in the same file at their original sizes. Nothing is scaled or cropped to match.
Does the order of files I add determine the page order?
Yes, and you can change it before merging. Files are combined top to bottom in the order shown in the list, and dragging a file to a new position changes where its pages land.