Browser tool

PNG to JPG Converter

Convert PNG images to optimized JPGs without leaving your browser—ideal for speeding up websites, marketing pages, ecommerce galleries, and anyone looking for a fast “PNG to JPG converter online”.

Capabilities

Smaller JPGs without cloud uploads

Fast PNG to JPG conversion

Drag large PNGs or batches into PolyImg and convert them to lightweight JPGs instantly via WebAssembly and WebCodecs.

Compression & resize controls

Set quality targets, auto-resize long edges, flatten transparent backgrounds, and see real-time savings.

Browser-only workflow

All conversion happens locally via Canvas and OffscreenCanvas, so brand assets and sensitive files stay private.

WebAssembly encoders mirror CDN pipelines (MozJPEG, AVIF, etc.), so your previews match production output.
Workflow

Three steps to PNG → JPG

  1. 1Upload or drop PNG files into the PolyImg workspace; previews render instantly.
  2. 2Configure compression quality, resizing, and background fill (for transparent PNGs) while reviewing live output.
  3. 3Export JPGs in bulk or copy them directly into your CMS, CDN, or design system.
  • Apply multiple presets (e.g., blog hero, social share image) and export them simultaneously.
  • Save PNG→JPG presets to IndexedDB so teammates keep compression and naming rules consistent.
Quality & privacy

Keep control over quality and confidentiality

PolyImg balances compression and clarity so marketing shots, UI mockups, and product photos look sharp even after conversion.

Because everything runs locally, unreleased designs, medical imagery, or legal files never leave your workstation.

FAQs

Questions teams ask most about the PolyImg PNG to JPG converter. Need automation or API hooks? Let us know.