Merge PDF Files
Combine several PDF files into one document in your chosen order, entirely in the browser.
🔒 Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
Scanned pages saved as separate files, a contract split into chapters, several invoices for one report — sooner or later everyone needs to merge PDF files into a single document. Most online mergers make you upload private paperwork to someone else's server; this tool does the same job without your files ever leaving the computer.
Add two or more PDFs by drag & drop or through the file picker, then arrange them: every file in the list has up/down buttons and a remove button, so you can fix the order without re-selecting anything. When you press the button, the tool copies every page of every document — in exactly the order shown — into one new PDF and hands it back as a download.
The merging is done by the pdf-lib engine running inside your browser, so pages keep their original size, orientation, fonts and graphics; nothing is rasterized or recompressed. Because there is no server, there is nothing to queue for, no file-size caps imposed by a hosting plan, and no watermark stamped on the result.
The tool is handy for freelancers assembling deliverables, students combining lecture scans, accountants packaging receipts, and anyone who needs to send one tidy attachment instead of five. It works offline once the page has loaded — useful for confidential contracts, medical records and other documents you would rather not upload anywhere.
Are my PDFs uploaded to a server to be merged?
No. The merge runs entirely in your browser using the pdf-lib library — your files are read locally, combined locally, and the result is handed back to you as a download without ever being sent over the network. You can verify this yourself: open your browser's developer tools, switch to the Network tab, and merge a file — no request carrying your document will appear.
Does merging reduce PDF quality or re-compress images?
No. The tool copies each page's underlying content — text, fonts, vector graphics and embedded images — into the new file as-is; nothing is rasterized, re-encoded or recompressed. The merged file's quality is identical to the source files.
Is there a limit on how many PDFs I can merge?
There's no limit built into the tool itself — you can add as many files as you like. The practical ceiling is your device's available memory, since every file is held in the browser tab while merging; very large batches (hundreds of megabytes total) may slow down or fail on lower-memory devices.
Can I change the page order after adding files?
Yes. Every file in the list has up and down buttons to reorder it and a remove button to drop it, so you can fix the sequence without re-selecting or re-uploading anything. The final PDF's page order follows the file order shown at the moment you merge.