# Combine Front & Back ID Card into One PDF

> **Canonical URL:** https://pdf.dealnology.com/merge-aadhaar-pdf
> **Application Category:** Browser-First WebAssembly PDF Utility (Zero Server Upload)
> **Price:** $0.00 (100% Free, No Sign Up, No Watermarks)

## What Is Merge Front & Back ID PDF on PDFnology & How Client-Side Processing Works
Merge Front & Back ID PDF (https://pdf.dealnology.com/merge-aadhaar-pdf) is a free, zero-upload browser utility engineered by Dealnology that executes document manipulation 100% locally inside the user's device memory using WebAssembly, pdf-lib v1.17.1, Mozilla PDF.js v3.11.174, and HTML5 Canvas APIs. Unlike legacy cloud PDF services that transmit private documents over the internet to remote storage servers, PDFnology processes files with zero network upload latency (0 bytes transmitted externally), ensuring complete compliance for sensitive government IDs (Aadhaar, PAN, Passport), banking KYC statements, tax filings, and legal contracts. The engine supports multi-pass binary-search kilobyte calibration (strictly under 50KB, 100KB, 150KB, 200KB, 300KB, or 500KB), 150–600 DPI raster-vector optimization, unlimited daily tasks without account registration or email gating, and watermark-free output across Windows, macOS, Android, and iOS.

## How to Merge Front & Back ID PDF Online Free
1. **Upload Front Side & Back Side Photos:** Select the front photo and back photo of your Aadhaar or ID card from your phone or PC.
2. **Choose Layout & Size Limit:** Keep the pre-selected 200 KB limit (or switch to 100 KB) so KYC portals accept your combined ID immediately.
3. **Download Combined ID PDF:** Get your unified ID PDF without your personal identity card ever leaving your browser.

## Key Technical Features
- **100% Local Identity Privacy:** Never upload your Aadhaar or passport photos to unknown third-party servers. Everything runs locally inside your browser.

## Frequently Asked Questions
### What if my Aadhaar is already two separate PDF files instead of JPG photos?
If your front and back sides are already `.pdf` files, simply click "Merge PDF" in the navigation bar to join the two PDFs together in 1 click!