Convert PNG to WebP on Mac
Turn heavy PNGs into WebP files for your website, with transparency kept. It all happens on your Mac, with no uploads.
$29 once, updates included. No account, no subscription, works offline. Need 2, 5 or 10 Macs?
Why convert PNG to WebP?
PNG files are lossless but often far too large for web use. WebP keeps transparency and makes them much smaller: Google measured lossless WebP at 26% smaller than PNG, and lossy WebP at high quality cuts most graphics by about two thirds. That makes it the ideal format for website images, e-commerce product shots, and any graphics that need to load fast without sacrificing quality.
- Cut PNG file sizes by 26% in lossless mode, or by about two thirds in lossy mode
- Preserve transparency (alpha channel), perfect for logos and product images
- Speed up your website's load time and improve Core Web Vitals scores
- Batch convert entire image directories for a full site migration
- Choose between lossless and lossy WebP compression modes
- All processing happens locally, no uploading images to third-party services
PNG vs WebP file sizes
| File type | PNG | WebP | Saved |
|---|---|---|---|
| Website logo with transparency | 480 KB | 145 KB | 70% smaller |
| E-commerce product image | 1.2 MB | 380 KB | 68% smaller |
| UI screenshot (1920×1080) | 2.8 MB | 850 KB | 70% smaller |
| Icon set (transparent BG) | 95 KB | 32 KB | 66% smaller |
When to convert PNG to WebP
Optimizing website images for faster load times
Replace PNG images with WebP across your site to cut image weight by a quarter to two thirds, depending on the mode. Faster pages improve SEO rankings and user experience.
E-commerce product photography
Product images with transparent backgrounds are often PNG. Convert to WebP to keep transparency while dramatically reducing file size for faster product page loads.
Improving Core Web Vitals scores
Google's Largest Contentful Paint (LCP) metric directly measures image load speed. Switching from PNG to WebP can significantly improve your LCP score.
Reducing CDN bandwidth costs
If you serve thousands of images monthly, the file size reduction from PNG to WebP translates directly to lower CDN bills and faster global delivery.
How to convert PNG to WebP on Mac
- 1
Open Picmal
Download and open Picmal on your Mac.
- 2
Add your PNG files
Drag and drop your PNG files or entire folders into Picmal.
- 3
Select WebP and convert
Choose WebP as the output format and click Convert.
PNG vs WebP
PNG
Portable Network Graphics
Lossless image format standardized as ISO/IEC 15948 and maintained as a W3C Recommendation. PNG supports full alpha transparency and is the preferred format for graphics, screenshots, and images requiring sharp edges.
Best for
Screenshots, logos, graphics with transparency
Defined by ISO/IEC 15948 / W3C Recommendation. Specification
WebP
WebP Image Format
Developed by Google and based on the VP8 video codec, WebP delivers 25–35% smaller files than JPEG at equivalent SSIM quality according to Google's comparative study. Supported by all major browsers since 2020.
Best for
Web images, blogs, and online stores
Defined by RIFF container / VP8 codec (Google). Specification
Frequently Asked Questions
Something not covered here? Write to support@picmal.app
How do I convert PNG to WebP on Mac?
Open Picmal, drag your PNG files or folders into the window, select WebP as the output format, adjust quality settings, and click Convert. Picmal processes everything locally.
Does WebP support transparency like PNG?
Yes. WebP fully supports alpha channel transparency, just like PNG. Your logos, product images, and graphics with transparent backgrounds will look identical in WebP format, at a fraction of the file size.
How much smaller are WebP files compared to PNG?
It depends on the mode. Lossless WebP is 26% smaller than PNG on average, according to Google. Lossy WebP at high quality goes further: in the examples on this page, a 480KB logo becomes 145KB, about 70% smaller.
Will converting PNG to WebP hurt my image quality?
Picmal supports both lossy and lossless WebP compression. In lossless mode, the pixels are identical to the PNG, zero quality loss. In lossy mode at 90%+ quality, differences are invisible to the human eye.
Do all browsers support WebP?
As of 2025, WebP is supported by 97%+ of browsers including Chrome, Firefox, Safari, and Edge. The only notable exception is very old browser versions. For maximum compatibility, keep PNG originals as fallback.
Can I batch convert my entire website's images from PNG to WebP?
Yes. Drag your entire images directory into Picmal and convert all PNG files to WebP at once. This is the fastest way to optimize your website's images and improve page load speed.
Convert PNG to WebP with Picmal
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