PDF Tools
Merge PDF
Combine pages from validated PDF files in selected file order with clear preservation limits.
Enter the values and review the result.
No merged PDF yet
Select at least two valid PDFs and explicitly merge them.
Selected-file and page order
The tool validates every selected PDF before creating a new document, then copies every page from each file in selected-file order. Mixed page dimensions and orientations are retained where pdf-lib supports them. There is no page-level selection or in-tool reordering.
Worked example and preservation limits
Selecting a two-page report followed by a one-page receipt creates a three-page output containing the report pages first. Page appearance and dimensions may be preserved, but forms, signatures, bookmarks, attachments, scripts, actions, and document metadata may not remain functional or be preserved.
Browser processing and common failures
Processing occurs in your browser. Selected file contents are not sent to a conversion server by this tool. Large, complex, corrupt, encrypted, or unusual files may fail, and browser memory varies by device. Review the generated PDF before relying on or sharing it. See the PDF Security Guide for document-safety context.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
File and image results can vary by file structure, browser support, size, fonts, compression, and format limits. Review downloaded files before using or sharing them, and avoid sensitive files unless you understand how the tool handles them.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Select two to ten PDFs in the order you want their pages copied.
Review the numbered list and remove any file you do not want.
Merge every page, then download and review the new PDF.
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Related Guides
Background reading and explanations related to Merge PDF.
Frequently Asked Questions
Common questions about Merge PDF and how to read the result.
Can I reorder files here?
No. Pages follow the order supplied by the native file selector. Reselect the files to change that order.
Are mixed page sizes supported?
Copied pages retain their individual dimensions and orientation where pdf-lib supports them.
Can I select individual pages?
No. Every page from every accepted PDF is copied in source order.
Are forms and signatures preserved?
They may not remain functional or be preserved. Digitally signed PDFs should be expected to lose valid signature status after merging.
Can encrypted PDFs be merged?
No. Password-protected, encrypted, corrupt, truncated, or unsupported PDFs are rejected.
Where are files processed?
Processing occurs in your browser. Selected file contents are not sent to a conversion server by this tool.