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ImageConv

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

✅ Free Core⭐ Premium ExtraChromium · 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
6-language UI (EN/ES/DE/JA/FR/ZH)
JPG white fill for transparent backgrounds
Duplicate click guard (2s debounce)
Large image handling (>20MB async indicator)

⭐ Premium Extra

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

Installation

Download or clone the source code
Open chrome://extensions/
Enable Developer mode
Click Load unpacked → select the pic-convert folder

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

Download Free Source Code Unlock Premium

For questions or support, email support@annmax.eu.org