Why I built a lightweight, ad-free QR Scanner using Web Technologies

Description and use

Fast QR Scanner is a lightweight, ad‑free web‑based QR code scanner that processes data client‑side, preserving privacy and performance without heavy libraries.

Problem

Existing QR scanner apps are bloated, require many permissions, and contain intrusive ads.

Outcome

Fast QR Scanner provides a fast, privacy‑preserving QR scanning experience without ads or heavy dependencies.

Workflow

• 1. Capture camera stream via getUserMedia
• 2. Decode QR code in the browser using lightweight algorithm
• 3. Display decoded data to the user

Evidence

Most of the QR scanner apps available today are bloated. They take too much space, require unnecessary permissions, and are often riddled with intrusive ads.

Source

All the decoding happens right in the browser. No images are uploaded to a server, ensuring 100% privacy.

Source

Zero Dependencies: I wanted the tool to be lightning-fast, so I avoided heavy libraries.

Source