Merge PDF — Combine PDF Files Into One Free Online

Drop two or more PDFs onto the tool, drag the rows to set the merge order, and click Merge & Download. Pages from each source PDF are copied into a single output document in your chosen order. Your files are uploaded over HTTPS and merged on our secure server, then removed under our Security policy.

You can reorder entire files (drag the row up or down), and you can remove a file from the merge with the trash icon. To reorder individual pages within a PDF, run it through our Organize PDF tool first, then merge.

Page content (text, images, fonts, hyperlinks within a page) is preserved exactly because whole pages are copied atomically rather than re-rendered. Document-level bookmarks and the table-of-contents are reset since the new file is a fresh document — re-add bookmarks with a desktop PDF editor if needed.

Each file can be up to 11MB on the Free plan, 50MB with Premium or 120MB with Pro, and you can merge up to 20 PDFs at once. Large documents use more browser and server memory, so split unusually large jobs into smaller merges.

Yes — your PDFs are uploaded over an encrypted (HTTPS) connection, retained temporarily to merge and deliver the result, then removed under our Security policy. We never sell them or use them to train models. If your policy strictly forbids any upload at all (e.g. some compliance workflows for contracts, NDAs or medical records), use a desktop PDF tool that runs fully offline instead.

If you know the password, decrypt first with our PDF Password tool, then merge. The merge tool can usually handle PDFs with light protection, but PDFs with strict encryption (printing/copying disabled) need to be unlocked first.

Slightly smaller because duplicate fonts and embedded resources are deduplicated during the merge. The difference is typically a few percent — significant only when you are merging many files that share the same font set (e.g. an entire branded report series).

Preview and download the merged PDF without creating an account. Free allowances and file limits apply; Premium adds larger files and batch capabilities.

Yes — each page keeps its own dimensions in the combined file because pages are copied as-is rather than reflowed. An A4 contract, a Letter-size invoice and a landscape spreadsheet can all sit in one PDF, each at its original size. Drag the rows to control which document comes first.

Yes, but with a different tool: Split PDF extracts a page range (e.g. 5-12) into its own file, and Organize PDF lets you delete or reorder pages in the merged result. Merge only joins files together, so reach for those sibling tools when you need to take a combined PDF apart again.

Yes — click "Add more" at any time before merging; new files are appended to the end of the list with their own thumbnail rendered automatically. Drag them, or use the up/down arrow buttons, into position relative to the files already there — you don't need to restart the order from scratch.

Yes — every file row has small up/down arrow buttons next to the drag handle that move it one position at a time, which is far more reliable than a drag gesture on a touchscreen. Tap them repeatedly to walk a file to the top or bottom of the merge order.

Yes — no desktop software is needed. Drop your PDFs into the browser, reorder them, preview the merge and download the clean combined file without creating an account. Temporary files are processed over HTTPS and deleted automatically.

Almost always one of three things. The file is over the 11 MB free upload limit — Premium takes 50 MB and Pro 120 MB. The format is not one this tool accepts, so check the list shown on the upload panel. Or the file is not really the format its name says: renaming a file does not change what is inside it, and that is the reason a valid-looking PDF gets refused.

Page content is preserved, but anything that depended on the original file being interactive can behave differently — form fields, layers and annotations may be flattened into the page depending on the operation you ran. If you need the fields to stay fillable, do the flattening step last. Keep the untouched original until you have checked the output end to end.

No. You can run Merge PDF and download the free result without an account, and it carries no watermark. Premium is what you buy when the limits start to bite: larger uploads, no daily cap, and the original-resolution result. Nothing is revealed at the download step that was not visible before you started.

No — Merge PDF runs in the browser on desktop and phone. There is nothing to install, no trial to start, and no license to buy before you can see whether it does what you need. Try it on the file you are actually stuck with rather than a sample.