How do I combine multiple PDF files into one?

Drop two or more PDF files onto FileWash, arrange them in your desired order using drag-and-drop or the arrow buttons, then click "Merge PDFs into One." The combined PDF downloads instantly. All processing happens in your browser — your documents are never uploaded to any server.

Can I reorder pages when merging PDFs?

Yes. After adding your PDF files, drag them to rearrange the order or use the up/down arrow buttons. The final merged PDF will contain pages in the order shown on screen. You can also remove individual files before merging.

Is it safe to merge PDFs online?

FileWash is uniquely safe for merging confidential documents because your PDFs never leave your device. Unlike most PDF tools that upload files to remote servers, FileWash uses the pdf-lib JavaScript library to process everything locally in your browser. No data is transmitted over the internet.

Is there a limit to how many PDFs I can merge?

There is no artificial limit. You can merge as many PDFs as your device's memory allows. For most modern devices, merging 50+ PDF files with hundreds of pages total works smoothly. Very large merges (1000+ pages) may be slower but will still complete.

Will merging PDFs change the content or formatting?

No. FileWash copies pages exactly as they are from each source PDF into the merged document. All text, images, links, form fields, and formatting are preserved identically. The merged PDF is a faithful combination of the originals.

Back to tools

Merge PDF Files Online — Free, Private, No Upload

Combine multiple PDF documents into a single file. Preview pages and drag to reorder. All processing happens in your browser — your documents never leave your device.

Drop PDF files here

Add 2 or more PDFs to merge them into one