Toolis.dev

Image Converter

Convert PNG, JPG, and WebP images directly in your browser. Drop a batch, pick the target format, and download — nothing uploaded, no signup, no watermark.

  • Runs in browser
  • No signup
  • No tracking
Share
Found this useful?Buy me a coffee

How to use Image Converter

  1. Drop one or more images onto the upload area.

  2. Pick the target format — WebP for size, JPG for compatibility, PNG for transparency.

  3. Adjust quality (JPG and WebP) if needed.

  4. Download each result, or use 'Download all'.

When to use it

  • Converting PNG screenshots to WebP for blog posts.

  • Converting WebP downloads to JPG for tools that don't support WebP.

  • Batch-converting photo libraries to WebP for size savings.

  • Stripping transparency by converting PNG → JPG with white background.

What it fixes

  • Online converters that watermark, paywall, or upload to a server.

  • Operating system 'Export As…' lacking batch mode.

  • Loss of transparency when converting via screenshot tools.

About Image Converter

The web has standardized on three image formats: PNG (lossless, transparency), JPG (lossy, photos), and WebP (smaller, modern). Most online converters upload your image to a remote server before sending it back — which is a problem for screenshots of internal dashboards or anything else under NDA.

This tool uses the browser's Canvas API to decode the source image and re-encode it as PNG, JPG, or WebP. Quality is adjustable for JPG and WebP. Batch mode runs each file with the same settings — useful for prepping a folder of assets for a blog or upload.

References: MDN — HTMLCanvasElement.toBlob · Google web.dev — WebP guide

Frequently asked

  • Are my images uploaded?

    No. Conversion happens in your browser via the Canvas API. Files never leave your device.

  • Why is JPG smaller than PNG?

    JPG is lossy and works well for photos. PNG is lossless and best for screenshots, logos, and anything with transparency. WebP usually beats both for size at similar quality.

  • What happens to transparency when converting to JPG?

    JPG has no alpha channel. Transparent pixels are filled with white before encoding. To keep transparency, convert to PNG or WebP instead.

  • What's the best format for web?

    WebP for photos and most images — typically 25–35% smaller than JPG at similar quality, with transparency support. PNG for icons and screenshots that need lossless quality.

Discussion

All tools