Adding pages to an existing PDF is the close cousin of deleting them, and it shows up just as often: a cover page that needs to go in front, an addendum to a contract, a page of references that has to fit between the appendix and the index. Done well, it's a 30-second task. Done poorly, it produces a Frankenstein document with three different page sizes, broken page numbers, and a TOC that no longer matches the body.
Decide what you're inserting
The trick to clean inserts is matching the new pages to the existing document's conventions:
- Page size (A4, Letter, Legal, custom).
- Orientation (portrait or landscape).
- Page numbering (continue from the previous section, restart, or no number at all).
- Header / footer style.
- Margin and binding edge.
Mismatches stand out. A Letter cover page on an A4 document looks like a mistake. A landscape addendum in a portrait document is fine if it's deliberate, jarring if accidental.
Method 1: Browser-based insert
A browser tool with a thumbnail view is the easiest way to insert pages. Docento.app lets you drop a second PDF anywhere into the first by drag-and-drop, with no upload — the files stay on your device.
Workflow:
- Open the destination PDF.
- Drag the source PDF onto the thumbnail panel at the position where you want the new pages.
- Reorder if needed.
- Save.
This handles the common cases: prepend a cover, append an appendix, splice an addendum into the middle.
Method 2: macOS Preview
Built-in option for Mac:
- Open both PDFs in Preview.
- Show thumbnails for both (
View → Thumbnails). - Drag pages from one Preview window into the other at the desired position.
- Save.
Cross-Preview drag is more reliable than people expect. Just confirm the page sizes match before saving.
Method 3: Insert blank pages for later editing
Sometimes you want to insert blank pages as placeholders — for hand-written notes, for printing, for a TOC you'll generate later:
- Most browser tools have an "Insert blank page" command at any thumbnail position.
qpdfcan do this with--pagesif you create a single-page blank PDF first.- Print drivers can do "blank between pages" via the N-up settings.
For booklet printing where you need blanks for binding, see how to print a booklet from a PDF.
Method 4: Command line
For repeating inserts (every weekly report needs a cover page; every contract needs a standard preamble), the command line scales:
- qpdf:
qpdf cover.pdf --pages cover.pdf body.pdf -- combined.pdf— concatenates two PDFs. - For inserts in the middle:
qpdf body.pdf --pages body.pdf 1-5 insert.pdf body.pdf 6-z -- output.pdf— keeps body pages 1-5, inserts the new pages, then continues with body page 6 onwards. - pdftk: similar with the
catcommand.
See our batch processing guide for examples.
Headers, footers, and page numbers
Inserting pages into the middle of a numbered document means the existing page numbers are now wrong. Three options:
- Renumber the whole document. Cleanest. See adding page numbers to a PDF.
- Use roman numerals for inserted prefatory pages (cover, foreword, TOC) and continue Arabic for the body. Standard for books and longer reports.
- Don't number inserted material if it's an appendix or addendum that's clearly separated. Common for contract amendments and brochures.
Don't just leave the old numbers — readers will notice and lose trust in the document.
Bookmarks and the table of contents
After insertion:
- Bookmarks in the original may point at pages that have shifted. Most tools update them automatically, but always verify by clicking a few. See adding bookmarks.
- The TOC, if it has page numbers, needs to be regenerated. If you have the source document, regenerate there. If not, expect to update the page numbers by hand.
- Internal cross-references in the text ("see page 32") are static and need manual update.
Mixing scanned and digital pages
A common case: insert a scanned signature page into an otherwise digital PDF. The result has a hybrid text layer — searchable up to and after the scan, but the scan itself isn't searchable until you OCR it.
Recommendation: OCR the scanned page before insertion. The result is a fully searchable document. See making a PDF searchable with OCR.
Mixing page sizes
If you must insert a Letter page into an A4 document (or vice versa), three options:
- Resize the inserted page to match. Best for visual consistency.
- Crop or letterbox the inserted page so it sits within the document's page size. Loses content if you crop.
- Leave the size mismatch and accept that the document has mixed sizes. Acceptable for legal exhibits and similar contexts where the insert needs to be a verbatim copy.
Most PDF tools that support inserts also handle resizing as part of the same operation.
Preserving form fields and signatures
Two important caveats:
- Form fields: inserting pages doesn't affect existing fields, but the document object that defines all fields lives at the document level. Most modern tools handle this correctly. Test the form after insertion to be sure.
- Digital signatures: insertion invalidates them. If the document was signed, you'll need to re-sign or accept that the signature is no longer cryptographically valid. See signing a PDF online.
Conclusion
Insert pages by drag-and-drop in a browser tool, by Preview on macOS, or by qpdf for repeating jobs. Always update page numbers, bookmarks, and the TOC afterwards if your document has them. Docento.app handles inserts in the browser without uploads, and pairs well with reordering pages when you need to clean up the result.