PNG to WebP Converter — Full Transparency, 26–80% Smaller

How to convert PNG to WebP

1. Drop your PNG files onto the converter above — or click to browse and select multiple files.
2. Click Convert on any individual file, or Convert all to process the entire batch at once.
3. Download individually or click Download all for a ZIP archive.
4. Tip: transparent PNG backgrounds are fully preserved in the WebP output — both formats support the full alpha channel.

Design assets processed locally — no upload, no exposure

PNG logos and brand assets are converted entirely in your browser — no file leaves your device. This matters for confidential design work: brand identity files, pre-launch renders, and client assets processed without exposure to any third party.

WebP encoding via the Canvas API is fast — a batch of 50 PNG icons or UI assets typically converts in under 3 seconds. Once the page loads, the tool works offline, making it safe to use on public Wi-Fi.

// PNG alpha channel is preserved automatically by Canvas
const canvas = document.createElement('canvas')
canvas.width = img.width
canvas.height = img.height
// No white fill — PNG transparency passes through intact
canvas.getContext('2d').drawImage(img, 0, 0)
canvas.toBlob(cb, 'image/webp', 0.92)

Who converts PNG to WebP

Front-end developers exporting design assets from Figma, Sketch, or Adobe XD as PNG — the standard export format for UI components. Converting the batch to WebP cuts icon library weight by 26–80% without losing the transparency that makes them usable on colored backgrounds.

WordPress and Shopify theme builders converting PNG logo files for header and footer use. A transparent PNG logo can be 80–200 KB; the WebP equivalent is often 15–40 KB — a 5–7× reduction with no visible difference at any display size.

Game and app developers optimizing UI sprite sheets exported as PNG. WebP lossless achieves 26% smaller files than PNG while preserving exact pixel values — critical for sharp UI across all device DPI settings.

PNG vs WebP — format comparison

When to convert to WebP vs keep PNG

Convert PNG to WebP when:

• Figma / Sketch / XD exports — convert the design asset batch to WebP before deploying to production
• WordPress / Shopify logos — transparent WebP logos load 5–7× faster than PNG equivalents
• Next.js / Nuxt / Astro — image components serve WebP automatically from any PNG source
• Icon libraries — WebP cuts icon file size by 26–80%, improving page load for icon-heavy UIs
• CDN and bandwidth costs — serving WebP instead of PNG reduces storage and transfer costs

Keep PNG when:

• Design tool workflows — Photoshop, Illustrator, Canva, and Affinity don't support WebP natively as an edit format
• Print and prepress — print workflows require PNG or TIFF; WebP is a web-only format
• Sending to clients — clients using standard design apps may not be able to open WebP files
• Pixel-perfect lossless — if exact pixel values must be preserved, PNG lossless is the safest choice

How the conversion works

Your browser loads the PNG into a hidden HTMLImageElement. On the load event, the image — including its full alpha channel — is painted onto an HTML5 Canvas. The canvas encodes the pixel data as WebP via toBlob() at quality 0.92.

Quality 0.92 produces near-lossless output for logos and graphics. For photographic PNG content, lower quality settings (0.75–0.85) show no visible degradation while achieving 50–80% size reduction compared to the PNG source.

const blob = await new Promise(resolve => {
  const img = new Image()
  img.onload = () => {
    const canvas = Object.assign(
      document.createElement('canvas'),
      { width: img.width, height: img.height }
    )
    // Alpha channel preserved — no white fill applied
    canvas.getContext('2d').drawImage(img, 0, 0)
    canvas.toBlob(resolve, 'image/webp', 0.92)
  }
  img.src = URL.createObjectURL(pngFile)
})