How In-Browser PDF Merging Works
Traditional PDF merging services upload your sensitive documents to remote cloud servers to process and return a stitched file. Our tool operates entirely inside your local browser memory using pdf-lib WebAssembly and JavaScript binary manipulation routines. Your documents, contracts, and personal records never leave your device.
Key Benefits of Client-Side PDF Processing
- 100% Data Confidentiality: Zero cloud uploads mean confidential invoices, financial statements, and personal contracts remain strictly private on your computer.
- Instant Rearrangement: Drag and drop or move individual document cards to reorder pages and files in real time before triggering the merge.
- Memory Guardrails: Built-in safety limits (up to 20 files or 50MB per batch) ensure mobile tabs and low-memory devices operate smoothly without crashing.
Frequently Asked Questions
- Are my files uploaded to any third-party server?
- No. All parsing, page extraction, and document concatenation occur 100% inside your browser's local memory via pdf-lib. No data is ever transmitted over the network.
- What is the maximum file size or document limit?
- You can merge up to 20 PDF files or up to 50MB in total aggregate size per batch. This guardrail prevents mobile browser tabs from running out of memory.
- Can I reorder documents before merging?
- Yes! Use the drag handle on each document card or the Move Up and Move Down arrow buttons to arrange your documents in the exact order you want them merged.