Merge PDF Files Online

Combine several PDFs into one document in the order you choose. Everything happens in your browser — your files are never uploaded.

Drop PDF files here

or click to browse — max 50 MB

🔒 Your PDFs are merged locally in your browser — they are never uploaded to a server.

Frequently Asked Questions

How do I merge PDF files into one?

Drop two or more PDFs into the tool, put them in the order you want with the arrow buttons or by dragging, and click Merge. A single combined PDF is downloaded to your device.

Are my PDF files uploaded to your servers?

No. The files are read and combined by JavaScript running in your browser. Nothing is uploaded, stored or logged, so confidential documents never leave your computer.

Does merging PDFs reduce the quality?

No. Pages are copied as-is into the new document, so text stays selectable and images keep their original resolution. Nothing is re-rendered or re-compressed.

Can I merge password-protected PDFs?

Not directly. Encrypted PDFs cannot be read without the password, so the tool flags them. Remove the protection in your PDF reader first, then add the unlocked copy.

Is there a limit on how many PDFs I can combine?

There is no fixed file count. Each file can be up to 50 MB, and the practical limit is your device's memory — dozens of normal documents merge in a few seconds.

Are bookmarks and links kept when merging PDFs?

Page content, annotations and most internal page links are preserved. The document outline (bookmarks) of the source files is not rebuilt in the merged PDF.

How this PDF merger works

A PDF is not one long stream of text: it is a collection of objects (pages, fonts, images, annotations) tied together by a cross-reference table. Merging two PDFs therefore cannot be done by simply gluing the files end to end. This tool opens every document with the open-source pdf-lib library, copies each page together with every resource it depends on into a brand-new document, and then writes a fresh, valid cross-reference table.

Because pages are copied rather than re-rendered, the result is lossless: text stays selectable and searchable, vector graphics stay sharp and images keep their original resolution. The output is saved with compressed object streams, so the merged file is often slightly smaller than the sum of its parts.

How to combine PDF files step by step

  1. Add your files. Drag PDFs onto the drop area or click it to browse. You can add more files at any time.
  2. Check the list. Each row shows the page count and size, which helps you spot the wrong version of a document before merging.
  3. Set the order. Use the ↑ and ↓ buttons, or drag a row to a new position. The first file in the list becomes the first pages of the result.
  4. Merge and download. Click the merge button. The combined file is named after the first document with a -merged.pdf suffix.

Common reasons to merge PDFs

  • Job and visa applications — portals often accept a single upload, so the CV, cover letter and certificates must become one file.
  • Invoices and expense reports — bundle a month of receipts into one PDF for your accountant.
  • Scanned documents — scanners frequently save each sheet as a separate PDF; merging restores the original document.
  • Reports and theses — join chapters exported from different tools (Word, LaTeX, spreadsheets) into one deliverable.

Tips and limitations

  • Pages keep their own size and orientation, so mixing A4 and Letter documents is fine — each page simply stays as it was.
  • Password-protected PDFs cannot be opened without the password. Unlock them first; the tool tells you which file is encrypted.
  • Bookmarks (the outline panel) and fillable form fields from different files may not carry over cleanly. Flatten forms before merging if they matter.
  • Very large merges are limited by your device's memory. If a browser tab struggles, merge in two batches and then merge the results.
  • Need just a few pages from one of the files? Extract them first with the split tool, then merge the pieces.

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