Interleave two PDFs

Alternate pages from two PDFs (e.g. merging separately scanned odd/even pages). Optionally reverse the second file's page order first.

Everything happens on your device. Nothing goes outside.

On-device
Everything happens on your device. Nothing goes outside.
This tool runs in your browser — your file is never uploaded, never stored, never logged.
Drop your files here or click to choose
Files stay on this device · max 100 MB

Choose the two PDFs — pages are alternated starting with the first file.

By using this tool you agree to the Terms of Service and Acceptable Use Policy — and for this tool, your file never left this device.

How interleave two pdfs works here

Alternate pages from two PDFs (e.g. merging separately scanned odd/even pages). Optionally reverse the second file's page order first. The whole job — parsing, processing and saving — happens in this browser tab using open-source libraries (pdf-lib / PDF.js). Close the tab and nothing remains anywhere.

People often pair this with merge pdfs and split pdf — same deal there: free, private, no sign-up.

Parameters

ParameterTypeDefaultDescription
reverse_secondbooleanoptionalFalse

FAQ

Is Interleave two PDFs free?

Yes — completely free, with no watermark, no sign-up and no trial clock. On the API/MCP side every key gets 250 guaranteed operations a day plus unlimited burst operations on spare capacity. See the pricing page for the full (short) policy.

Does my file get uploaded to a server?

No. This tool runs entirely in your browser with the same libraries the pros use — your file never leaves your device, so there is nothing to store, log or leak.

Can I automate Interleave two PDFs with an AI agent or code?

Yes — the exact same operation is a tool on the pdfmcp MCP server (for Claude, Cursor, ChatGPT and other agents) and an endpoint on the REST API. One free key works for both; the guides walk you through setup in about a minute.

Are there limits?

Files up to 100 MB and 500 pages. Web tools are additionally bounded by your device's memory. The caps exist to stop abuse and keep the shared machine fair — they are not a paywall, and there is no paid tier to unlock.

Related tools

On-deviceMerge PDFsCombine multiple PDF files into one, in upload order.On-deviceSplit PDFSplit a PDF by page ranges (ZIP of PDFs) or one PDF per page.On-deviceRotate pagesRotate pages by 90, 180 or 270 degrees.On-deviceDelete pagesRemove the selected pages from a PDF.On-deviceExtract pagesCreate a new PDF containing only the selected pages.On-deviceReorder pagesRearrange pages into the given 1-based order (a permutation of all pages).

Browse the organize pdf hub or the full tool index. Building something bigger? Read the features tour and the free usage policy.