Merge PDF Files - Free Online Tool

A PDF merger combines multiple PDF files into a single PDF. Use it when you need one upload, one attachment, or one archived document instead of a folder full of separate PDFs. This tool merges PDFs locally in your browser, so your files are not uploaded for processing.

1. Add your PDFs: Choose two or more .pdf files from your device.
2. Reorder the files: Use the up and down arrows to set the merge order.
3. Merge and download: Click Merge, then download the combined PDF.

• Fewer attachments: Combine invoices, contracts, or reports into one file for email and portals.
• Order you can control: File order becomes page order, so you can assemble the final PDF reliably.
• Private processing: Merging happens on your device in the browser.

Merging is simple: the output PDF is built by taking every page from the first file, then every page from the second file, and so on. Reordering the file list changes the final page order. Pages inside each PDF keep their original order.

If you need to reorder or delete individual pages inside a PDF, use a PDF editor first. Then merge the cleaned PDFs here.

Use case 1: Combine invoices for bookkeeping

Merge monthly invoices into a single PDF so your accounting system, client, or finance team receives one clean upload.

Use case 2: Build a single report packet

If you have separate PDFs for a cover letter, charts, and supporting docs, merge them into one packet for reviews and approvals.

Use case 3: Consolidate scanned pages

If you scanned pages as separate PDFs, merge them into one document so the final file behaves like a normal multi-page scan.

Basic example

Inputs: invoice-jan.pdf, invoice-feb.pdf, invoice-mar.pdf
Order: Jan, then Feb, then Mar
Output: One merged PDF in the same order.

Advanced example (multi-page PDFs)

Inputs: cover.pdf (1 page), report.pdf (12 pages), appendix.pdf (4 pages)
Order: Cover, report, appendix
Output: A single PDF where pages remain in order within each file, and files are stitched together in the order you set.

• It merges pages and preserves the visual content of each page.
• It does not compress PDFs. If your input files are large, the merged file will usually be large too.
• It does not change page order within a file. File order controls the sequence, not individual pages.

"Not a PDF"

Some files are renamed to end in .pdf even though they are not real PDFs. Re-export the file as a proper PDF, or open it and print to PDF, then merge again.

Password-protected or encrypted PDFs

Encrypted PDFs may fail to load in browser-based mergers. Remove the password protection (if you have permission), export an unprotected copy, and try again.

File too large

Very large PDFs can hit file size limits or browser memory limits. If a single file is over 25 MB, reduce it first or split the job into smaller batches and merge the outputs.

The merged PDF will not open

If one of the input PDFs is corrupted or incomplete, merging can fail or produce an output that some viewers cannot open. Re-export the problematic file (or print to PDF), then try again.

• Set the order first: Reordering before merge is faster than fixing a wrong output later.
• Name files with numbers: 01-cover.pdf, 02-report.pdf, 03-appendix.pdf makes ordering easier when you have a long list.
• Create PDFs from images, then merge: If you start with photos or screenshots, convert them with JPG to PDF or PNG to PDF, then merge everything into one document.
• Keep your originals: Merging is a structural change. Keep the original PDFs if you might need separate files later.

• Turn photos into PDFs with JPG to PDF or PNG to PDF.
• Extract copyable text from screenshots of PDFs with image to text (OCR).

PDF merging runs locally in your browser. Your PDFs are not uploaded to a server for processing. If you are working with sensitive documents, download the merged PDF and close the tab when you are finished.