Are my images uploaded to a server?

No. The entire conversion runs inside your browser using the HTML5 Canvas API. Your image never leaves your device.

Does WebP support transparency?

Yes. Unlike JPG, WebP fully supports an alpha channel, so transparent areas in your PNG are preserved in the output WebP file.

What quality setting should I use?

Quality 80–85 is the sweet spot for most images — visually near-lossless at significantly smaller file sizes than PNG. For text-heavy or line-art images, 90+ is safer. For thumbnails or social media previews, 70–75 is acceptable.

Why is the WebP sometimes larger than the original PNG?

PNGs with very simple, flat-color graphics compress extremely well with lossless encoding. For such images, a lossy WebP at high quality can occasionally be larger. Try lowering the quality slider or use a lossless WebP encoder for flat graphics.

Is there a file size limit?

The limit is your browser's available memory, typically several hundred megabytes. Very large images (over 30 MP) may be slow to process on low-end devices.

Do all browsers support WebP?

WebP is supported by all modern browsers — Chrome, Edge, Firefox, and Safari (version 14+). If you need to target very old browsers, keep the original PNG as a fallback.

PNG to WebP Converter

Upload a PNG, adjust the quality slider, and download the WebP — all processed locally in your browser, nothing sent to a server.

Upload PNG

Click or drag a PNG here

PNG files only

WebP Quality

1 — smallest 100 — best

Preview (WebP output)

Upload a PNG to see the preview

Adjust quality to compare sizes in real time

Downloaded!

Summary

This tool converts PNG images to WebP format entirely inside your browser using the HTML5 Canvas API. No files are ever uploaded to any server — all processing happens on your device. WebP typically delivers 25–35% smaller files than PNG at equivalent visual quality, and unlike JPG, WebP supports full transparency. Use the quality slider to balance image clarity against file size and see a live size comparison before downloading.

How it works

Select or drag a PNG image onto the upload area.
Adjust the WebP quality slider (1–100) to your preference.
The preview and estimated output size update instantly.
Review the before/after file size comparison.
Click "Download WebP" to save the converted image.

Use cases

Shrink large PNG screenshots for faster web page loads.
Convert product images to WebP for e-commerce performance gains.
Reduce image weight without losing transparency support.
Prepare design exports from Figma or Sketch for modern browsers.
Compress logos and icons while preserving alpha channel.
Preview different quality levels before final export.
Process images privately without uploading to a third-party service.
Optimize hero images and banners for Core Web Vitals improvement.

Frequently Asked Questions

Last updated: 2026-05-28 · Reviewed by Nham Vu