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6 min read · Reviewed July 2026
Merge PDF
Combine PDFs in the order you choose — parsed, rebuilt, and verified inside your browser.
Processed locallyIn: PDFOut: PDF
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How to use merge pdf
Select two or more PDF files.
Reorder them with the up/down controls; each shows its page count.
Merge — a fresh document is assembled locally from the source pages.
The merged output is reopened and its page count verified before download.
What this tool does
- Merge any number of PDFs within device memory
- Explicit ordering with per-file page counts
- Fresh-document output (no incremental-save remnants)
- Page-count verification on the merged result
How the result is verified
The merged bytes are reopened with the PDF engine and the output page count is compared against the sum of selected source pages.
Frequently asked questions
Does merging preserve my pages exactly?
Pages are copied with their content streams, dimensions, and rotation. Interactive features that span documents — like forms and scripts — are not preserved, which also means merged output can't quietly carry hidden attachments from sources.
Is my file uploaded to a server?
No. The file is opened with your browser's File API and processed by code running in your tab. You can confirm this yourself: open your browser's developer tools, watch the Network panel, and process a file — no request carries your file's bytes. See our How it works page for a step-by-step verification guide.
Is there a file size limit?
There is no artificial upload limit because there is no upload. Practical capacity depends on your device's memory and your browser. Very large files may be slow or fail to decode on low-memory devices; if that happens the tool fails safely without altering your original file.
Understand the format
Technical guidance, limitations, and safer workflows related to this tool.
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