FIRST CH TOOLS LOCAL PROCESSING — PDFS ARE NEVER UPLOADED 日本語

FIRST CH TOOLS / 40 PDF MERGE & SPLIT

PDF Merge, Split & Page Extract

Join several PDFs into one, pull out just the pages you need, change their order and fix the rotation. Contracts, quotes and scans stay on your machine — nothing is uploaded anywhere.

Drag & drop PDFs here or click to choose files (several at a time, up to 200 MB each)
Creates a 3-page and a 2-page PDF right here and loads them.

How to Use

  1. Add PDFsDrag & drop them or click to choose. With more than one, use ↑ ↓ to set the merge order.
  2. Pick pages and rotationWrite something like 1-3,5,8- under “Pages” and those pages are used in that order. Leave it empty for every page. Fix sideways scans with “Rotate”.
  3. Build and saveChoose the output (one merged PDF / one per file / one per page) and press “Build the PDF”. Two or more files can be taken as a ZIP.

About This Tool

Joining a quote and an invoice, lifting two clauses out of a contract, straightening a page the scanner read sideways — routine work, except that the file usually carries client names, figures and personal data. Most free PDF services do the work on their own servers, which is exactly what an internal policy tends to forbid. This tool reads and writes the file entirely on your device and never sends the PDF anywhere (once the page has loaded, it keeps working offline).

Write the page range in the order you want the pages. They are copied in exactly that order, so the same field also covers reordering and duplicating, not just extracting.

You writeYou get
(empty)Every page
1-3,5Pages 1 to 3, then page 5
8-Page 8 to the end
-4The start through page 4
3,1,2Reordered: 3, then 1, then 2
5-1Reversed: page 5 down to page 1
1,1,2Page 1 duplicated

Pages are copied into a new document rather than redrawn, so text stays selectable and image quality is untouched. Rotation is added to whatever the page already had (asking for “90° right” on a page that is already turned 90° gives you 180°). Files from “one PDF per page” keep the original page number in the name, like contract-p03.pdf.

Some things this tool cannot do. Password-protected PDFs will not open — remove the protection in your PDF viewer first. Bookmarks, form field settings and document properties (title, author) are not carried over. Digital signatures are broken, unavoidably: a signature certifies that the file has not changed by a single byte, so rearranging pages always invalidates it. The limits are 200 MB per input file and 500 output files.

The PDF work is done by pdf-lib (MIT), bundled with this site. To create a PDF from scratch, see Markdown → PDF; for slide decks, Marp Markdown → Slides.

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