Merge PDF files
Combine several PDFs into one document in the order you choose, without uploading anything.
Drop your files here
.pdf · up to 300 MB
How to Merge PDF
- 1
Add your PDF files
Drop up to fifty PDFs into the box at once, or add them a few at a time. Each file appears as a card with its page count.
- 2
Drag the cards to set the order
Pages are joined top to bottom, in the order the cards sit in. Drag a card to move a whole file; remove one with the cross.
- 3
Click Merge and download
The merged file is built on your device and saved as merged.pdf.
Pages are copied, not re-rendered
Merging here is a structural operation: every page object is copied into the new document as it was, keeping its size, rotation, embedded fonts, vector art and image data untouched. Nothing is rasterised, so a crisp contract stays crisp and a scanned invoice does not pick up a second round of JPEG artefacts. That is also why the merged file is close to the sum of the originals: combining is not a compression step. If the result needs to fit an email limit, run it through Compress PDF afterwards.
Bookmarks, forms and metadata
By default each source file becomes a top-level bookmark named after the file, so a fifty-page bundle still has a table of contents. Interactive form fields are flattened before copying, because two copies of the same form would otherwise share one field name and one value; choose Keep the first form when one file must stay fillable. The title and author of the first document carry over, and the producer is always set to PulsarKit.
Where your files go
Nowhere. The merge runs inside this page using your own browser and processor, so the PDFs are never uploaded, never queued on a server and never stored. There is no account and no cleanup timer to trust. Close the tab and the files are gone from memory with it.
Frequently asked questions
How many PDF files can I merge at once?
Up to fifty files, totalling 500 MB. That covers almost every bundle of contracts, invoices or scans. If you need more, merge in two rounds: the output of the first round is a normal PDF you can feed straight back in.
Does merging reduce the quality of my PDFs?
No. Pages are copied as complete objects, so text stays selectable, fonts stay embedded and images keep their original resolution. The merged file has the same visual quality as the sources because none of the content is re-encoded.
Are my files uploaded to a server?
No. Everything happens in your browser, on your device. The files are read into memory, joined and written back out locally, which is why the tool keeps working even after you lose your connection.
Can I merge password-protected PDFs?
Not directly. A password-protected file cannot have its pages copied, so it is reported by name and the tool offers to open it in Unlock PDF first. Remove the password there, then bring the file back here.
What happens to form fields and signatures?
Form fields are flattened into the page by default, so the filled values stay visible but are no longer editable. Digital signatures cover the file they were made in, so they cannot survive a merge; the visible signature appearance is kept.
Can I change the order of pages inside one file?
Not here. This tool orders whole files. To reorder, rotate or drop individual pages, use Organize PDF, or split the file first and merge the pieces back in the order you want.
Does it work on a phone?
Yes. The cards can be dragged with a finger and the merge runs in the mobile browser. Very large bundles are limited by the memory of the phone rather than by the tool, so split huge jobs into two rounds.
Guides
- A PDFgear Alternative: What Matches and Where Your File GoesOn October 20, 2026, we matched the 37 cards on PDFgear's online tools page against PulsarKit. 34 of the 36 tools behind them had a counterpart; PDF to PSD and PSD to PDF had none.
- Compressing a Scanned Book: What Each Level Does to 60 PagesA forum question asked how to shrink a 580-page book scan without hurting the text. We ran a 60-page scan through every level of Compress PDF and checked the pixels, the sizes and the words.
- iPhone Photos to One PDF: HEIC, Order, Size, What Leaves Your PhoneSeveral iPhone photos can become one PDF in Safari, with no app and no account. Here is how HEIC to PDF handles order, page size, Live Photos, dates and locations, and what stays on your phone.
- PDF24 Tools and PulsarKit: What Matches and What Is MissingOn October 20, 2026, PulsarKit had a counterpart for 74 of the 108 online tools on PDF24's tools page. Both sites are free and need no account, so this comparison looks at the missing jobs, where your file goes and the stated limits.
- Free Alternative to Adobe Acrobat Online: What Matches, What's MissingOn October 20, 2026, we went through the 50 tool cards on the Adobe Acrobat online tools page. PulsarKit had a counterpart for 34 of them, with no account and no paid plan.
- A Smallpdf Alternative Without a Subscription: What Matches and What Is MissingOn October 19, 2026, we went through the 47 tools on Smallpdf's tools page. PulsarKit had a counterpart for 39 of them, with no account, no daily cap on browser tools and no subscription.
- An iLovePDF Alternative Without Sign-Up: What Matches and What Is MissingOn October 16, 2026, we counted 31 PDF tools on the iLovePDF homepage, excluding two workflow cards. PulsarKit had counterparts for 28.
- How to Merge and Compress a Stack of PDFs Without Losing QualityCombining pages and shrinking a file are two different jobs. Doing them in the wrong order costs you quality you didn't need to lose.
Related tools
Split PDFCut one PDF into several documents by page ranges, every N pages, or one page per file.
Compress PDFMake a PDF smaller by re-encoding the images inside it, dropping duplicated objects and clearing metadata, without sending the document anywhere.
Organize PDFPut the pages of a document in the order you want, and rotate, duplicate or drop individual pages along the way.
Rotate PDFTurn pages 90, 180 or 270 degrees and save the new orientation into the file itself, not just into your viewer.
Extract pagesPick the pages you need and save them as a new PDF, leaving the original untouched.
Protect PDFPut an open password on a PDF, encrypt it with AES-256 and decide who may print, copy or edit it.