Merge PDF

Merge several PDFs into one in your browser — pages are copied losslessly in the order you set. Files are processed entirely on your device, never uploaded. Runs entirely in your browser — your numbers never leave this device.

Add PDFs to merge

Click to browse, or drag and drop files here — it never leaves your device.

No PDFs yet. Add two or more above — they are combined entirely on this device, and the order in the list below is the order the pages appear in the merged file.

How it works

Output pages = the sum of the input files' page counts, in the order the files are listed | Each page is copied with its original size and rotation — nothing is re-rendered or re-encoded

What a merge keeps — pages are copied, not re-rendered

Property	Preserved?	Why
Page size	Yes — per page	Each page keeps its own dimensions (A4 stays 595.28 × 841.89 pt)
Page rotation	Yes	The stored rotation of each page is copied with it
Text layer	Yes	Text stays selectable and searchable in the merged file
Vector graphics	Yes	Drawings are copied as vectors, never rasterised
Bookmarks / outline	Not guaranteed	Outlines belong to the source documents, not to copied pages
Form fields	Not guaranteed	Fields with identical names in different files can collide

Your files are processed entirely in your browser and never uploaded: each PDF is read from your own disk into memory, its pages are copied into a new document in the order you list the files, and the combined file is offered back as a download. There is no server component to this tool at all — load the page, disconnect from the network, and merging works identically offline, which is the proof of the design. Page copying is structural, not visual: pages are transferred as page objects, so text stays text, vector graphics stay vector, and nothing is flattened into an image.

Because pages are copied rather than re-rendered, what a merge keeps is exact: each page keeps its own page size (an A4 page stays 595.28 × 841.89 pt even beside a Letter page at 612 × 792 pt), its stored rotation, its text layer and its embedded fonts, as the table below summarises. The output's page count is simple arithmetic — the sum of the inputs' page counts — and the tool reports each input's page count before you merge so the expected total can be checked in advance: a 3-page file followed by a 4-page file must produce exactly 7 pages.

Order is the one decision the tool cannot make for you. Files merge in list order, top to bottom, and pages inside each file keep their original order — to interleave pages from two documents, split one of them first with the Split PDF tool and merge the pieces in the sequence you want. Merging does not compress anything: the output is a new container holding the copied pages, so its byte size is close to the sum of the inputs, sometimes slightly smaller where duplicated shared resources are stored once, but never a promised saving.

Worked examples

Two files, one document

Input: report.pdf (3 pages) followed by appendix.pdf (4 pages)
Working: Pages are copied in list order: 3 + 4 = 7 pages. Pages 1–3 are the report, pages 4–7 are the appendix.
Result: One PDF of exactly 7 pages

Three files with mixed page sizes

Input: cover.pdf (1 page, Letter 612 × 792 pt), body.pdf (5 pages, A4), chart.pdf (1 page, A4 landscape)
Working: 1 + 5 + 1 = 7 pages. Each page keeps its own size and orientation — the Letter cover is not stretched to A4 and the landscape chart is not rotated.
Result: One PDF of 7 pages with mixed page sizes preserved

Checking the total before merging

Input: Four files listed as 2, 6, 1 and 9 pages
Working: Expected output = 2 + 6 + 1 + 9 = 18 pages. If the download reports any other page count, a file was listed twice or missed — the arithmetic is the check.
Result: One PDF of exactly 18 pages

Frequently asked questions

Are my PDFs uploaded to a server to merge them?

No — never. The files are read, copied and combined entirely inside your browser on your own device; no file, page or fragment is sent anywhere, stored or logged. The tool works with the network disconnected, which is the simplest way to verify that.

Will merging reduce the quality of my pages?

No. Pages are copied structurally, not re-rendered: text stays text, vectors stay vector, images keep their original encoding, and page sizes and rotations are preserved per page. The merged file looks identical to the sources page for page. (The one tool in this category that does re-render pages is Compress PDF, and its page says so plainly.)

Can I merge pages in an interleaved order, like page 1 of A, page 1 of B?

Not directly — merging appends whole files in list order and keeps each file's internal order. For interleaving, split the files into the pieces you need with Split PDF first, then merge the pieces in the exact sequence you want.

Why is the merged file not exactly the sum of the input sizes?

A PDF carries per-file overhead (catalogue, cross-reference tables) that is written once in the output, and resources shared between files can be stored once. The page count is the exact figure to check — sizes are close to the sum, page counts are precisely the sum.

What happens with a password-protected PDF?

A file the browser cannot open cannot be copied, and the tool says so for that file rather than producing a partial merge. Remove the password in the application that set it, then merge the unlocked copy.