How it works
Merge PDF — Merge multiple PDFs into one file. All processing happens in your browser — no upload, no signup, no email required. Free forever.
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About Merge PDF
Merge PDF combines two or more PDF files into a single document, preserving the original page quality and order you choose. It is a 100% browser-based PDF merger — your files never reach a server, which matters when you're stitching together invoices, contracts, or medical records.
Anyone who deals with paperwork eventually needs to merge PDFs: lawyers bundling exhibits, students assembling a thesis appendix, recruiters consolidating CV plus cover letter, accountants packaging receipts for a single client. This tool turns a five-minute multi-step process into a drag-drop-download.
Because the work is done locally with pdf-lib, you can combine confidential documents (bank statements, tax returns, signed NDAs) without ever exposing them to a third-party service.
How to use Merge PDF
- Drag all the PDFs you want to combine onto the upload zone, or use the picker to select multiple files at once.
- Check the file list — every PDF will show up in the order you added it.
- Use the up and down arrows next to each file to rearrange them; the merged output follows this exact order.
- Remove an unwanted file with the X button if you added one by mistake.
- Click Merge & download. The combined PDF appears as a fresh file in your downloads folder.
Common use cases
- Combining a contract and its annexes into a single file before emailing it to a client or counterparty.
- Bundling chapters exported separately from Word or LaTeX into one continuous report or thesis.
- Joining scanned receipts from a business trip into one expense report PDF for accounting.
- Merging a cover letter, CV, and portfolio samples into a single application document for a job posting.
- Putting together a printable booklet from multiple template pages downloaded from different sites.
Tips & common mistakes
- Order matters — once you click Merge the page sequence is fixed in the output, so double-check the list before downloading.
- All input files keep their original resolution and embedded fonts; there is no re-encoding, so the merged PDF's size is roughly the sum of the input sizes.
- If one of the source PDFs is password-protected, remove the password before merging — encrypted files cannot be read by the browser.
- For very large jobs (a hundred files or several gigabytes), close other browser tabs first so the PDF merger has enough memory to work with.
Frequently asked questions
Are my PDFs uploaded to your server?
No. The merge happens entirely in your browser using JavaScript. Your files never leave your device.
Is there a file size or page limit?
There is no hard limit. Very large PDFs (1GB+) may be slow because the browser has to load them into memory, but it works.
Can I rearrange pages before merging?
Yes — once you add files, use the up/down arrows to reorder them. The merged PDF respects the order shown.
Will bookmarks, links, or form fields survive the merge?
Page content, internal links inside a single source PDF, and embedded images are preserved. Top-level outlines/bookmarks and AcroForm fields are flattened — if you need them retained, use a desktop tool like Acrobat Pro after merging.
Can I merge PDFs of different page sizes (A4 + Letter + A3)?
Yes. Each page keeps its original size in the merged file; readers will simply display them at their native dimensions one after another.
Is there a way to merge only specific pages from each PDF?
Not in this tool — Merge takes whole files. To pull specific pages, first use Split PDF to isolate the ranges you want, then merge the resulting smaller PDFs.