How is this different from other online PDF tools?

Most online PDF tools send your files to a remote server for processing. This tool processes everything locally in your browser using client-side JavaScript. Your files are never transmitted to any server, which means your document content stays entirely under your control.

Are my PDF files uploaded?

No. Your files are read directly by your browser. Your files are never transmitted over the network. The tool works entirely within the browser tab you have open.

Can I verify that files are not uploaded?

Yes. Open your browser's developer tools (F12), go to the Network tab, and watch for any outgoing requests while using the tool. You will see no file data leave your browser. The site may record an anonymous page-view count, which never includes your files and can be disabled.

Does this tool work offline?

Yes, once the page has loaded the tool processes your files entirely in your browser; tool functionality needs no network connection. You can disconnect from the internet and continue using it.

What happens when I refresh the page?

Because nothing is stored on a server, refreshing the page clears your current session. Any files you had selected will need to be selected again.

Does this tool store my files?

No. Files are held in browser memory only for as long as the page is open. Closing or refreshing the page discards them. Nothing is written to disk by the tool, and nothing is sent to a server.

Can this tool unlock password-protected PDFs?

No. This tool does not attempt to remove or bypass PDF password protection. If you know the password, the Unlock PDF tool on this site can remove it locally; then this tool can process the file.

What technologies does this tool use?

This tool uses client-side JavaScript and pdf-lib to insert blank pages into the PDF structure entirely within your browser — your files never leave your browser.

Does this tool use WebAssembly?

No. This tool uses client-side JavaScript and pdf-lib for local PDF structure editing. No WebAssembly is involved.

How do I insert blank pages into my PDF?

Choose a PDF with the file picker, then in the settings panel enter the page number(s) after which you want blanks (type 0 to add a blank before page 1, e.g. 0, 2, 4), set how many blank pages to add at each spot, click Insert, and save the updated file. Everything runs locally in your browser.

What do the position numbers mean, and how do I add a page before page 1?

Each number is the existing page after which blank pages are inserted, so 2 puts a blank between pages 2 and 3. To add a blank before the very first page, use 0, and you can list several positions separated by commas like 0, 3, 5.

What size are the inserted blank pages?

Each blank page is sized to match the page at its insertion point rather than a fixed size, so blanks adopt that neighbour's dimensions. In a document that mixes page sizes the result depends on which position you pick, so choose positions next to a page of the size you want.

Does the Insert Blank Pages tool cost anything to use?

Inserting blank pages into your PDF is completely free — no account, no sign-up, and no cap on how many PDFs or pages you work with, and it always will be. Because the tool runs entirely inside your browser using pdf-lib, your PDF is read into local browser memory and the blank pages are inserted there; the file is never sent anywhere. You can verify this yourself with your browser's Network tab — no file data leaves your device at any point.

Insert Blank Pages Privately — Your PDF Never Leaves Your Browser

Select a PDF, choose the positions and how many blank pages to add, and download the updated file — all processing happens locally in your browser with no upload.

Quick answer

What it does: Select a PDF, choose the positions and how many blank pages to add, and download the updated file — all processing happens locally in your browser with no upload.
Free?: Yes — 100% free, no account or sign-up.
Files uploaded?: No — everything is processed in your browser.
Works offline?: Yes — once the page has loaded.
Best for: A notary inserts a blank signature page between each section of a multi-party agreement for wet-ink signing.
Good to know: Inserted pages are blank; this tool does not copy content from another PDF.

How it works

Select a PDF file from your device using the file picker.
The file is read into browser memory — no data leaves your browser.
Enter the page number(s) after which blank pages should be inserted (use 0 to insert before the first page) and how many blank pages to add at each position.
pdf-lib inserts the blank pages, each sized to match its neighbouring page, and reassembles the document.
The updated PDF is offered as a download directly from your browser.

When to use this tool

A notary inserts a blank signature page between each section of a multi-party agreement for wet-ink signing.
A designer adds blank separator sheets between chapters before handing a print proof to a production house.
A student inserts a blank first page to leave space for a handwritten title page.
Inserted pages are always blank — use Organize or Merge if you need to insert pages taken from another PDF.

Frequently asked questions

How is this different from other online PDF tools?: Most online PDF tools send your files to a remote server for processing. This tool processes everything locally in your browser using client-side JavaScript. Your files are never transmitted to any server, which means your document content stays entirely under your control.
Are my PDF files uploaded?: No. Your files are read directly by your browser. Your files are never transmitted over the network. The tool works entirely within the browser tab you have open.
Can I verify that files are not uploaded?: Yes. Open your browser's developer tools (F12), go to the Network tab, and watch for any outgoing requests while using the tool. You will see no file data leave your browser. The site may record an anonymous page-view count, which never includes your files and can be disabled.
Does this tool work offline?: Yes, once the page has loaded the tool processes your files entirely in your browser; tool functionality needs no network connection. You can disconnect from the internet and continue using it.
What happens when I refresh the page?: Because nothing is stored on a server, refreshing the page clears your current session. Any files you had selected will need to be selected again.
Does this tool store my files?: No. Files are held in browser memory only for as long as the page is open. Closing or refreshing the page discards them. Nothing is written to disk by the tool, and nothing is sent to a server.
Can this tool unlock password-protected PDFs?: No. This tool does not attempt to remove or bypass PDF password protection. If you know the password, the Unlock PDF tool on this site can remove it locally; then this tool can process the file.
What technologies does this tool use?: This tool uses client-side JavaScript and pdf-lib to insert blank pages into the PDF structure entirely within your browser — your files never leave your browser.
Does this tool use WebAssembly?: No. This tool uses client-side JavaScript and pdf-lib for local PDF structure editing. No WebAssembly is involved.
How do I insert blank pages into my PDF?: Choose a PDF with the file picker, then in the settings panel enter the page number(s) after which you want blanks (type 0 to add a blank before page 1, e.g. 0, 2, 4), set how many blank pages to add at each spot, click Insert, and save the updated file. Everything runs locally in your browser.
What do the position numbers mean, and how do I add a page before page 1?: Each number is the existing page after which blank pages are inserted, so 2 puts a blank between pages 2 and 3. To add a blank before the very first page, use 0, and you can list several positions separated by commas like 0, 3, 5.
What size are the inserted blank pages?: Each blank page is sized to match the page at its insertion point rather than a fixed size, so blanks adopt that neighbour's dimensions. In a document that mixes page sizes the result depends on which position you pick, so choose positions next to a page of the size you want.
Does the Insert Blank Pages tool cost anything to use?: Inserting blank pages into your PDF is completely free — no account, no sign-up, and no cap on how many PDFs or pages you work with, and it always will be. Because the tool runs entirely inside your browser using pdf-lib, your PDF is read into local browser memory and the blank pages are inserted there; the file is never sent anywhere. You can verify this yourself with your browser's Network tab — no file data leaves your device at any point.