Merge & Combine PDF Files

Stitch multiple PDF documents together into a single file with custom ordering and selective page extraction, processed entirely in your browser.

PDFs merged successfully

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🧩 Combine Custom Document Sequences

Stitch dozens of separate PDF reports, invoices, legal statements, or contracts together into a single unified file. Customise the exact document order using instant visual reordering buttons.

🔒 100% Client-Side Privacy

All document decoding, binary stream extraction, page restructuring, and PDF file compiling occur strictly within your browser memory. Your confidential records, bank statements, and ID scans never leave your device.

How to Merge Multiple PDF Files In-Browser

  1. Select PDF Files: Drag and drop two or more PDF documents into the upload zone or paste files using Ctrl + V.
  2. Reorder Documents: Use the ↑ and ↓ buttons to establish your desired document order.
  3. Filter Page Subsets: Type custom page ranges (e.g. 1-4, 7) into the page input box for any document to exclude cover pages or appendices.
  4. Compile & Save: Click Merge PDFs into One File to immediately compile and download your stitched PDF document.

High-Performance Binary Architecture

BWTools uses client-side WebAssembly and typed binary ArrayBuffer structures via pdf-lib to manipulate PDF object dictionaries directly in browser memory without rasterisation loss.

Vector text, embedded font tables, high-resolution imagery, form fields, and vector paths are copied losslessly into the target document object tree. This preserves searchable text layers and vector line weights while maintaining minimal memory usage.

PDF Merger Performance Specifications

Feature Specification Selective Extraction Vector Fidelity Privacy Guarantee
Standard PDF (.pdf) PDF 1.0 – 2.0 Custom Ranges Supported 100% Lossless Vector 100% In-Browser
Scanned Documents Bitmap Payloads Custom Ranges Supported Original Resolution Preserved 100% In-Browser
Form Templates AcroForms / Static Custom Ranges Supported Native Tree Flattening 100% In-Browser

Frequently Asked Questions

How do I extract only specific pages before merging?

Next to each queued document card, you will find a "Pages:" input box. You can enter individual page numbers separated by commas or ranges separated by hyphens (e.g. 1-3, 5, 8-12). Only the specified pages will be included in the merged file.

Will merging affect my document's text clarity or file size?

No. The tool does not re-compress, downsample, or convert your pages to images. Vector text streams and embedded images are directly copied at 100% original fidelity without quality degradation.

Are my PDF files uploaded to any remote server?

Never. All PDF compiling and binary transformations execute 100% in your device's browser memory using client-side JavaScript. Your files never touch an external server or remote queue.