🔒 SecureCompress

Privacy-first offline image compressor for official documents

🌐 Live Demo: (https://nezchan0.github.io/SecureCompress/)

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📸 The Problem

Most online image compressors:

• ❌ Expose sensitive ID photos/signatures to privacy risks
• ❌ Offer inconsistent or lossy compression
• ❌ Lack DPI or physical (cm-based) dimension controls
• ❌ Require internet connectivity

There's a clear need for a privacy-first, offline, and guided image optimization tool.

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✨ The Solution

A secure, browser-based application that processes images entirely on your device. Perfect for government exam forms, job portals, visa applications, and any document requiring specific image specifications.

Key Features

• 🔒 100% Private - No uploads, images never leave your browser
• 📏 DPI Control - Set precise resolution (72-600 DPI)
• 📐 CM ↔ PX Converter - Convert dimensions with DPI awareness
• 🔄 Format Conversion - JPEG, PNG, WEBP support
• ✂️ Smart Resizing - Custom width/height in pixels
• 💾 Instant Download - Process and save in seconds
• 🌐 Fully Offline - Works without internet after first load
• 📱 Responsive Design - Desktop and mobile friendly

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🚀 Quick Start

1. Visit the live demo
2. Select your image file
3. Configure output format, DPI, and dimensions
4. Use the CM→PX helper for physical size requirements
5. Compress and download your optimized image

No installation required. No sign-up. No tracking.

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🎯 Perfect For

• 📋 Government exam applications (UPSC, SSC, banking exams)
• 💼 Job portals (Naukri, LinkedIn)
• ✈️ Visa/passport photo requirements
• 📄 Official document submissions
• 🆔 ID card photos
• 📝 Resume/CV attachments

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🛠️ Tech Stack

• HTML5 Canvas API - Image processing and manipulation
• Vanilla JavaScript - Zero dependencies, pure performance
• EXIF Parser - Auto-detect DPI from JPEG metadata
• CSS Grid - Modern responsive layout

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🔐 Privacy Promise

SecureCompress is built with privacy as the foundation:

• ✅ No data collection - No one can see or store your images
• ✅ No cookies or tracking - Zero analytics or monitoring
• ✅ No external API calls - Everything runs locally
• ✅ No image uploads - Files never leave your device
• ✅ 100% client-side - All processing in your browser
• ✅ Open source - Code is fully auditable

Your images stay on your device. Period.

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💡 CM to PX Helper

Understanding the relationship between physical size (cm) and pixels:

Formula: pixels = (centimeters × DPI) / 2.54

Example at 300 DPI:
- 3.5 cm × 4.5 cm photo
- Width: (3.5 × 300) / 2.54 = 413 px
- Height: (4.5 × 300) / 2.54 = 531 px

The built-in converter does this math for you automatically!

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🌟 Use Cases

Passport Photos

• Set exact dimensions (e.g., 3.5cm × 4.5cm)
• Convert to pixels using 300 DPI
• Export as JPEG with specific file size

Government Forms

• Meet strict size requirements (e.g., < 50KB)
• Maintain required DPI (often 200-300)
• Correct format (usually JPEG/JPG)

Job Applications

• Professional photo compression
• Standard dimensions
• Optimal file size for email

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🚀 Local Development

Want to run it locally or contribute?

# Clone the repository
git clone https://github.com/nezchan0/SecureCompress.git
cd securecompress

# Open in browser
# Simply open index.html in your browser

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🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Ideas for contribution:

• Additional image formats
• Image cropping tool
• Aspect ratio presets
• More metadata extraction

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📜 License

This project is licensed under the MIT License — feel free to use, modify, and distribute it freely, with attribution.

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🧑‍💻 Author

Alok Kumar Maurya – Developer | Email: alok05.maurya@gmail.com