VKT ImageConv

Convert images between PNG, JPG, WEBP, AVIF locally. Zero data upload.

Chromium · MV3 · Local OnlyChromium · Manifest V3 · Local Only

🆓 Free Features

Convert to PNG (lossless), JPG (high quality), WEBP (compact), AVIF (best compression)
Right-click context menu: Save as PNG/JPG/WEBP/AVIF
Copy as PNG/JPG/WEBP/AVIF to clipboard
File size comparison toast notification
Adjustable quality sliders for JPG/WEBP/AVIF
Smart link cleaning (strips CDN tracking params)
Drag & drop local files onto popup
Cross-origin image support via Service Worker
JPG white fill for transparent backgrounds
Duplicate click guard (2s debounce)
Large image handling (>20MB async indicator)

⭐ Advanced Features (License)

Monthly $3.99/mo or One-Time $14.99 via Creem

Batch convert multiple images at once
Export all images from a webpage in chosen format
Advanced quality presets (web/email/print)
Priority support

Installation

Visit the Chrome Web Store page for ImageConv
Click Add to Chrome and confirm
Click the ImageConv icon in your toolbar to start using

Usage

Right-click: Any image → ImageConv → Save as / Copy as → choose format
Drag & drop: Click icon → drag local file → select format → auto download
Quality: Open popup → adjust sliders → settings saved automatically

How It Works

Right-click image → Service Worker fetches image blob → Sends to Offscreen Document (Canvas API) → Exports as target format → Download or clipboard → Destroys all temporary resources.

Uses Chrome's Offscreen API because Manifest V3 Service Workers have no DOM access, but Canvas API requires a DOM.

Privacy

✅ Zero data upload — all processing in browser memory
✅ No analytics, no tracking, no remote calls
✅ No cookies
✅ Temporary memory only — images destroyed after conversion
✅ Minimal permissions: contextMenus, downloads, offscreen, storage, clipboardWrite

Install from Chrome Web Store Unlock Premium View on GitHub

GitHub repository only contains readme documentation for reference. No offline installation packages, source code for end users are not provided. Official installation channel is Chrome Web Store only.

For questions or support, email [email protected]