What is this tool?
Combine multiple PDF documents into a single file directly in your browser. Reorder pages and files interactively before generating the merged document.
When to use it?
Merge multi-part scanned documents, consolidate monthly invoices or receipts into a single tax file, combine project proposals with contract appendices, or compile individual PDF chapters into a book.
How does it work?
Reads uploaded PDF files into ArrayBuffers using browser FileReader APIs, parses the document object structure with the client-side pdf-lib WebAssembly/JavaScript library, copies selected pages sequentially into a new PDF document instance, and exports the final binary blob for immediate download.
Technical Specifications & Standards
The merger reconstructs PDF cross-reference tables (XREFs) and page tree objects in local memory while preserving embedded vector fonts and standard document metadata.
Operating Limits & Considerations
- Encrypted or password-protected PDF files must be decrypted before merging.
- Processing very large files (e.g. combined size exceeding 100 MB) depends on available browser RAM.
Example Conversions
Files: contract_part1.pdf (3 pages), contract_part2.pdf (2 pages)
Merged: merged_document.pdf (5 pages total)
Standards & Technical References
Frequently Asked Questions
Yes. Unlike traditional online PDF services that process your files on remote servers, this tool executes 100% inside your browser sandbox. You can verify this by inspecting the Network tab in your browser Developer Tools.
Yes. You can drag and drop or use the accessible reorder buttons to arrange documents in your desired sequence.