Image Format Converter (JPG ↔ PNG ↔ WebP ↔ AVIF)

Convert any image between JPG, PNG, WebP, and AVIF — all in your browser, no upload. Useful for shrinking page weight (WebP is ~25-30% smaller than JPG at the same quality), adding transparency (PNG / WebP), or modernising old image assets. Batch processes multiple files at once.

How to use the Image Format Converter (JPG ↔ PNG ↔ WebP ↔ AVIF)

Drop your images. Pick the target format. Quality only applies to lossy formats (JPG, WebP, AVIF). Each converted image appears with the new file size and a download button. Browser support for AVIF varies — if your browser doesn’t support encoding it, AVIF conversion silently falls back to WebP.

About Image Format Converter (JPG ↔ PNG ↔ WebP ↔ AVIF)

Modern web images should be WebP or AVIF. WebP gives ~25-30% smaller files than JPG at equivalent quality and is supported in every browser since 2020. AVIF goes further (~50% smaller than JPG) but encoder support in browsers is still limited — most browsers can decode it, but only some (Chrome, Edge with experimental flags) can encode it via Canvas. PNG remains the right choice for images that need lossless quality or transparency.

Why bother with conversion? Legacy assets uploaded as JPG can be re-saved as WebP for a free 30% page-weight win. Marketing teams that hand over PSDs or huge PNGs can be sent reformatted assets ready to drop into the CMS. Email templates often want JPG specifically (some old clients still don’t render WebP). The right format depends on context, and this converter makes the per-asset decision quick.

Common use cases

  • Pre-deployment image optimisation — batch-convert PNGs to WebP before publishing.
  • Email-safe sizing — reduce PNG file sizes to JPG for HTML emails.
  • Modernising a legacy CMS — convert old uploads to WebP / AVIF.
  • Removing transparency — convert a PNG to JPG when the alpha channel isn’t needed (smaller, faster decode).

Frequently asked questions

Why does AVIF sometimes silently fall back?
Many browsers can decode AVIF but not encode it via Canvas. The toBlob() method returns null in that case, and the converter falls back to WebP. Use Squoosh or a CLI like cwebp / avifenc when you need guaranteed AVIF output.

Will it preserve transparency?
PNG and WebP preserve transparency. JPG does not \xE2\x80\x94 transparent pixels become white (or whatever the underlying canvas background was).

What's the quality vs file size trade-off?
Default 85 is a good balance. 100 is visually lossless but 2-3x bigger. 75 starts showing artifacts on photos but is fine for text-heavy screenshots. Try a few values and compare.