Merge PDF Files: Combine Several PDFs Into One

Combine several PDFs into a single file right in your browser. Drag them into order, keep text selectable and scans sharp, and never upload a page to a server.

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How Merge PDF Files: Combine Several PDFs Into One works

Combine several PDFs into a single file right in your browser. Drag them into order, keep text selectable and scans sharp, and never upload a page to a server.

Input PDF files
Output Merged PDF
Works done 0

How to use it

This tool lets you merge PDF files into one document, in exactly the order you set. The work happens inside your browser with no upload step, so contracts, ID scans and medical letters stay on your device. Pages are copied as they are: text stays selectable, scans keep their resolution, and the finished file carries no watermark.

How to merge PDF files in five steps

  1. Click "Choose PDF files" and select every document you want to combine, or drag them straight onto the box.
  2. Forgot one? Add it the same way at any time; new files join the end of the list.
  3. Check the list, which shows each file's name, size, page count and a thumbnail of its first page. Drag a file to set the order, or use the up and down arrows, and press ✕ to drop a file you added by mistake.
  4. Once the order looks right, press "Run tool" or hit Ctrl + Enter to build the combined file.
  5. Save toolsbasic-merged.pdf with the download button, then open it once in a PDF reader to confirm the page order before you send it anywhere.

When you pick several files in one go, the order in which the file dialog hands them over depends on your browser and operating system, not on the order you clicked them. Numbering the files beforehand, for example 01-cover-letter.pdf, 02-resume.pdf and 03-references.pdf, makes a wrong position obvious at a glance.

What stays the same when you merge PDF pages

Nothing is redrawn or recompressed. Each page is lifted from its source and placed into the new document unchanged, which has a few practical consequences:

  • Text: pages exported from a word processor or downloaded from an online service remain searchable, and you can still select and copy their text.
  • Image quality: scans and photos keep the resolution they had, with no blurring and no colour shift.
  • Page size and orientation: a mix of A4, US Letter and landscape pages stays mixed. The tool never forces every page onto one paper size.
  • File size: because nothing is compressed, the merged PDF is roughly as large as the source files added together. Combining files will not make them smaller.

Bookmarks, forms and signatures: the honest caveats

A few things do not travel reliably. The bookmarks of the source files, the clickable outline a reader shows in its side panel, may be missing from the merged document. Fillable form fields can stop working, and document properties such as title and author are not copied over. If a completed application form has to go into the bundle, flatten it first or print it to a new PDF with the "Save as PDF" destination in your reader's print dialog; your answers then become a permanent part of the page. If the recipient still needs to type into the form, leave it out of the merge and attach it separately.

Digitally signed documents need the same care. Merging produces a brand-new file, and a signature that was valid for the original cannot be verified in it. Keep the signed original and send that whenever the signature itself is what matters.

Where combining PDFs saves time

  • Court and agency e-filing: exhibits such as contracts, invoices and correspondence often have to go in as one attachment, in the order the filing refers to them.
  • Applications: visa, university and rental applications frequently offer a single upload slot for passport scans, transcripts, bank statements and references.
  • Job hunting: a cover letter, resume and certificates in one file are easier for a recruiter to open and forward.
  • Expenses and bookkeeping: a month of receipts and invoices sent as one PDF instead of twenty attachments.
  • Page-by-page scans: a scanning app that saves every sheet as its own file leaves you with a folder of single pages; merging rebuilds the full document.

Portals of this kind usually cap the file size and sometimes the file type, and the rules differ from one system to the next, so read the upload instructions on the portal itself before you merge. If the combined file ends up over the limit, the split PDF tool can cut it into Part 1 and Part 2. Want to include phone photos of documents? Turn them into PDFs with JPG to PDF first, because this tool accepts PDF files only.

Troubleshooting

  • Password-protected files: encrypted PDFs cannot be opened here, and the tool asks you to remove the password in a PDF reader first. That includes files that open without a prompt but are encrypted to block printing or editing.
  • A file that will not load: it is damaged, or it has a .pdf extension without being a PDF inside. Opening it in the program that created it and saving it as PDF again is worth a try.
  • Limits: up to 50 files per run and up to 100 MB per file. There is no separate cap on the number of pages.
  • Slow on a phone: the merge runs in your device's memory, so dozens of heavy scans can take a while on a phone. Use a computer, or merge in smaller groups and then merge the groups.
  • Only part of a document: pull out the pages you need with the split tool first, then add that file here. For a picture of a single page, PDF to JPG is the better fit.

Privacy: your files stay on your device

Merging is handled by the open-source pdf-lib library running in your browser tab. Your PDFs are not sent to our server and nothing is stored; close the tab and they are gone from memory. The only thing the page records is an anonymous usage counter that ticks up after a successful merge. There is no account to create and no fee to pay. More document helpers are collected under PDF tools.

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Frequently asked questions

No. The tool does not turn pages into images or re-save them; it copies each page with its original content. A scanned page keeps the same resolution and text from a word processor stays selectable. The flip side is that the file does not shrink. If the merged PDF is too big for an upload form, rescanning the paper documents in grayscale or at a lower resolution is the most dependable way to cut the size.

No. The files you pick are read into your browser's memory and combined there, so not a single page reaches our server. That matters for sensitive paperwork such as ID cards, payslips, medical reports or legal filings. Closing the tab clears the files from memory. The page merely bumps an anonymous counter showing that the tool was used successfully, and that counter has no link to you or your documents.

You can add up to 50 files per run, and each file can be up to 100 MB. There is no separate limit on the total number of pages. With more than 50 documents, merge the first batch and download it, empty the list with Clear, then add the downloaded file together with the remaining documents and run the tool again. Because the work uses your device's memory, very large scans are handled more comfortably on a computer than on a phone.

Not directly. Encrypted files cannot be opened by the tool, and there is no field on the page for entering a password. Open the document with its password in a PDF reader, remove the protection in its security settings and save, or, if printing is allowed, print it to a new PDF. Add that unprotected copy to the list and the merge works normally. Delete the unprotected copy afterwards if you do not want it lying around.

The tool copies the content of every page but does not reliably carry over the bookmark tree of the source files. The text and images on the pages all come through; what you lose is the ability to jump between sections from the reader's side panel. For long reports or theses where navigation matters, recreate the bookmarks in a PDF editor after merging, or send the sections as separate files.

Only PDF files can be added to the list. For photos and scans saved as images, convert them first with the JPG to PDF tool, which accepts JPG, PNG, WebP, GIF, BMP and AVIF, then add the resulting PDF here. For a Word or other office document, use the save or export as PDF option in the program you wrote it in, then merge the exported file with the rest.