Merge PDF Files Online Free

Merge PDF files into one document, free and without uploading anything. Drop two or more PDFs onto the box above, drag them into the order you want, and click Merge. The combined file is assembled inside your browser and saved straight to your device - there is no upload step, no signup, and no watermark on what you download.

People call this different things depending on where they learned it. Merging, joining, combining and concatenating PDFs all describe the same operation, and this page does all of them. It also handles the case people usually phrase as "adding pages to a PDF", which is just merging where one of the files is the document you already have.

How to Merge PDF Files Online

1. Add your files. Drag them onto the box or click Select Files. Pick several at once - the order you add them is the order they start in.
2. Put them in order. Drag any file to move it, or use the move icon on a page to type the exact position it should land at. Switch Display Mode to Pages to work page by page instead, where you can also remove, rotate or crop individual pages and preview any of them full screen before they go in.
3. Merge and download. Click Merge PDF's. The file is built locally and downloads immediately.

Merge, Join, Combine - What's the Difference?

Nothing, in practice. A PDF joiner, a PDF combiner and a PDF merger are the same tool under different names, so if you searched for a PDF joiner online or just want to join PDF files end to end, this page does that job. The only distinction worth knowing is between merging and compressing: merging puts documents end to end and the result is roughly the sum of the parts, while compressing shrinks a file by lowering image quality. If your merged file comes out larger than you expected, that is normal - a merge adds sizes together. To do both jobs in one visit, use merge and compress PDF.

How to Add Pages to an Existing PDF

To add pages to a PDF you already have, add that document first and the pages you want to append second. They join at the end. To insert somewhere in the middle instead, switch Display Mode to Pages, which lays every page out individually so you can drag the new ones into position. The same view lets you delete pages you no longer want, so you can add and remove in a single pass rather than making two files.

Make Every Page the Same Width

A merge often mixes sources - an A4 export, a phone scan, a receipt - and the result reads like a pile of loose paper because every sheet is a different size. Tick Make all pages the same width before merging and every page is scaled to the median width of the set, each keeping its own aspect ratio, so one oversized scan cannot blow up the rest. Sideways pages are normalised on the width they display at, and because pages are rescaled as real page content rather than re-photographed, text stays selectable and searchable in the merged file.

Reorder, Rotate and Crop While You Merge

The Display Mode switch above the box changes what you are arranging. PDF's treats each file as one block, which is what you want when you are stitching whole documents together. Pages expands everything into individual pages, and that is where the editing lives: drag to reorder, remove a page, rotate a scan that came in sideways, crop away a margin, or click the eye icon to check a page full screen before it goes in. Long documents get shortcuts that dragging cannot match. Every page carries a move icon that simply asks for the position it should land at, the gaps between pages are numbered so that position 27 means something, the + in any gap inserts another file at that exact spot, and past fifteen pages a tick-box mode moves several pages to one position in a single step. Whatever you see in that grid is exactly what ends up in the merged file.

Images can go in alongside PDFs. JPG, PNG and iPhone HEIC files are all accepted and become pages in the output. If you are working mostly with photos rather than documents, merging PDF and JPEG files is a better fit for that job.

Your PDF Never Leaves Your Device

The merge runs in your browser. Your files are read from disk, combined in memory, and written back out - none of it travels to Pi7 or anywhere else. That has three practical consequences: there is no upload wait even with large scans, there is nothing sitting on a server afterwards that needs deleting, and the tool keeps working if your connection drops mid-way. It also means a contract or an ID scan stays on your machine, which is the part that matters if you are merging anything you would not email to a stranger.

Password-protected files work too: you type the password, the PDF is unlocked on your own device, and the password goes no further than your browser. No account, no watermark on the output, and no cap on how many times you can use it. If you need to edit text or fill fields rather than rearrange pages, the PDF editor is the tool for that.

Frequently Asked Questions

How many PDF files can I merge at once?

There is no fixed limit in the tool. Because the merge runs on your own device, the practical ceiling is your device's memory rather than a quota we set. A handful of ordinary documents is instant; a few hundred pages of scans will take a few seconds on a phone.

Are my PDF files uploaded to a server?

No. Everything happens inside your browser. Nothing is sent to Pi7, so there is no upload wait and nothing to delete afterwards.

Can I merge PDF files on my phone?

Yes. Tap Select Files to pick PDFs from your files app, drag the thumbnails to reorder them, then tap Merge PDF's to download the combined file. It works the same on Android and iPhone.