WebP & AVIF Converter Pro — Open Source

About

Convert images to PNG, JPG, WebP or AVIF — entirely on your device, using real image codecs compiled to WebAssembly. It reads the common web image formats (including WebP and AVIF) and re-encodes them with professional-grade quality. No servers. No tracking. No ads. Open source.
 
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WHY IT'S DIFFERENT
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Most converter extensions rely on the browser's basic canvas export, which silently drops quality, mishandles modern formats, and struggles with large images. Converter Pro uses dedicated WebAssembly codecs — the same kind of encoders behind professional tools — for predictable, high-quality results:
 
• True AVIF support via libavif — real decode and encode, not a checkbox
• mozjpeg encoding — typically smaller files at the same visual quality
• libwebp with both lossy and lossless modes
• Correct image orientation, so photos are never saved sideways
 
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PREVIEW STUDIO
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Open any image in Studio to decide before you save:
 
• See the result and its file size before downloading
• Before / after slider to compare the original with the converted image
• Live quality slider — the preview and file size update as you drag
• Transparency fill control (white, black or custom) when converting to a format without an alpha channel
 
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FAST EVERYDAY USE
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• Right-click any image to save it in your chosen format
• Keyboard shortcuts — hover an image and press a hotkey (works on galleries where right-click is blocked)
• Smart detection finds the image even behind overlays or CSS backgrounds
• Warns you about search-engine thumbnails so you don't save a tiny preview
• Drag and drop local files into the popup
 
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PRIVACY
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Everything happens locally in your browser. No image, URL, or usage data ever leaves your device. There are no servers, no analytics, no ads, and no third-party tracking. The full source code is open and auditable.
 
Why this extension asks for "all sites" access: images on a page are often served from a different domain than the page itself. The extension needs to read the image data to convert it. That data is processed on your device and discarded after conversion — it is never sent anywhere.
 
Open source (MIT). Built on the Squoosh / jSquash WebAssembly codecs.