VKT ImageConv

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

Chromium · MV3 · Local Only

🆓 Free Features

Right-click any image: Save as PNG/JPG/WEBP/AVIF or Copy as PNG (clipboard output is PNG only)
Drag & drop or paste — convert a local image in the popup; multi-file drops convert up to 5 files per run
Batch web export — scan the page you are on, tick images, and export up to 5 per run
Batch format / quality / resize editing in the export Options dialog
HEIC/HEIF support — convert iPhone photos locally via built-in WASM decoder, free on every plan
Resize — scale by percentage or exact pixels (auto aspect ratio)
File size comparison toast (original vs converted, savings %)
Adjustable quality sliders for JPG/WEBP/AVIF
Real AVIF encoding — built-in WASM encoder, works on every Chromium browser
Smart link cleaning — strips CDN tracking params for original quality
Cross-origin image support via Service Worker
JPG white fill for transparent PNG backgrounds
Duplicate click guard (2s debounce)
6-language UI (EN/ES/DE/JA/FR/ZH)

⭐ Premium Features (License Required)

Unlimited local batch — remove the 5-file cap on multi-file drops
Large web exports — export up to 100 page images in one run
ZIP archive delivery — bundle a web batch into one .zip; if packaging fails or the archive would exceed 4 GB, completed images are saved individually
Batch presets — save up to 12 format/quality/resize presets and reapply them in one click
Filename templates — name batch web downloads with {name}, {index}, {format}, {date}, {width}, and {height}; extensions are added automatically and collisions get -2, -3
Priority support

Is the free version enough?

See pricing & refund policy 3-day trial on request · 7-day refund for unused licenses · free features stay free after a subscription ends

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 PNG
Drag & drop: Click icon → drag a local file (or paste) → select format → auto download. Multi-file drops convert up to 5 files free
Batch export: Click the icon → Batch export images on this page → tick images → Options (format/quality/resize) → Export selected. Free: 5 per run; Pro: 100 plus presets, filename templates, and ZIP delivery
Quality: Open popup → adjust sliders → settings saved automatically
Resize: Open popup → Resize section → % or exact pixels → applies to all conversions
HEIC: Drop or paste .heic/.heif files into the popup, or right-click a HEIC image displayed on a page — free on every plan

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 — network requests are limited to fetching the images you convert, loading page images for batch export, and optional license validation
✅ No cookies
✅ Temporary memory only — images destroyed after conversion
✅ Minimal permissions: contextMenus, downloads, offscreen, storage, scripting, clipboardWrite, plus <all_urls> to fetch the image you clicked and scan the page for batch export. The extension never reads cookies or browsing history

Install for Chrome Install for Edge 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]