๐Ÿ”’ Your files are processed entirely in your browser and are never uploaded to any server.

Merge PDF Files

Combine multiple PDF files into a single document. Drag to reorder, then download in one click.

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Drop your PDF files here

or click to select files โ€” select 2 or more PDFs

Accepts: PDF (2 or more files)

What does merging PDFs mean?

Merging PDFs means combining the pages of two or more separate PDF files into a single PDF document. The result is one file that contains all the pages from the source files, in the order you choose. This is different from compressing or converting โ€” no content is changed, just assembled.

This tool uses pdf-lib, a JavaScript library, to copy pages directly from each source PDF and write them into a new combined document. Because pages are copied at the byte level without re-encoding, there is no quality loss โ€” text stays sharp, images stay crisp, and the file structure is preserved exactly as it was in the originals.

How to merge PDF files โ€” step by step

  1. Click the upload area and select two or more PDF files, or drag them onto the page. You can also use the "Add more files" button to add further PDFs after the initial selection.
  2. Your PDFs appear as a sortable list showing filename, page count, and file size. Drag the handle (โ ฟ) to reorder the files โ€” pages will be combined in this order from top to bottom.
  3. Use the ร— button to remove any file you no longer want to include.
  4. Optionally, enable "Add blank page between documents" to insert a separator page between each merged file.
  5. Click Merge PDFs. The combined document will be ready to download in seconds.

Common situations where merging PDFs is needed

  • Multi-part contracts โ€” A legal agreement distributed as separate parts (main agreement + schedules + appendices) needs to be combined before signing or archiving.
  • Scanned documents โ€” A scanner or scanning app saved each page as a separate PDF. Merge them into a single document before sharing or filing.
  • Reports with attachments โ€” Combine a main report PDF with its supporting data appendices into one complete document.
  • Job application packages โ€” Merge your CV, cover letter, and work samples into a single PDF for a cleaner submission.
  • Invoice bundles โ€” Combine monthly invoices into a single quarterly PDF for an accountant or expense report.
  • Research and reference โ€” Combine multiple journal articles, chapters, or downloaded PDFs into a single reference file on a topic.

Tips for merging PDFs

  • Set the order before merging. The merge is final โ€” drag files into the correct order in the list before clicking Merge. You can re-run the merge if you make a mistake.
  • Remove password protection first. Encrypted or password-protected PDFs cannot be merged. Remove passwords using your PDF viewer before uploading.
  • Check page counts. The file list shows the page count for each uploaded PDF. Verify that the counts match what you expect before merging.
  • Use the blank page separator for printing. When merging documents that will be printed double-sided, the blank page separator ensures each document starts on a right-hand (odd-numbered) page.

Frequently Asked Questions

Upload two or more PDF files, drag to set the order, then click Merge PDFs. The combined document downloads automatically when processing is complete.
There is no hard limit on the number of files. However, merging many large files may be slow as all processing happens in your browser's memory. Each individual file must be under 50MB. For very large jobs (10+ large PDFs), consider merging in two batches.
No. Pages are copied directly from the source PDFs without re-encoding or re-rendering. Image quality, text sharpness, and embedded fonts are all fully preserved in the merged output.
No. Password-protected PDFs cannot be read by the tool. Remove the password protection from each file using your PDF viewer before uploading.
No. All files are loaded into your browser's memory and processed locally using JavaScript. Nothing is sent to any server. This makes it safe to use with confidential documents.
The merge tool reorders whole files, not individual pages within files. To reorder pages within a specific PDF, use the Split PDF tool first to extract the pages you need in a new order, then merge.

Related tools

  • Split PDF โ€” Extract specific pages or split a PDF into separate files.
  • Compress PDF โ€” Reduce the size of your merged PDF if it is too large to email.
  • JPG to PDF โ€” Convert images to PDF before merging them with other documents.