How to Compress PNG Files for WordPress Upload (Speed Up Your Site)
By admin · Jun 15, 2026
Images are often the single largest factor affecting WordPress website speed. Large, uncompressed PNG files can cause slow page loading, poor Google PageSpeed scores, and frustrated visitors who click away before your page finishes loading.
Why WordPress PNG Compression Matters
- WordPress page speed directly affects Google SEO rankings
- Google's Core Web Vitals measure LCP (Largest Contentful Paint) — often an image
- WordPress default max upload size is 2–8 MB — large PNGs may exceed this
- WooCommerce product pages with many large images load especially slowly
- Mobile visitors (50%+ of traffic) are especially affected by large images
Method 1: Compress Before Uploading (Best Practice)
The ideal approach: compress every PNG before it ever enters your WordPress media library.
Step 1: Compress your PNG
Go to compresspngfile.com and upload your PNG. Download the compressed version.
Step 2: Upload to WordPress
Go to WordPress Dashboard > Media > Add New. Upload your compressed PNG.
Step 3: Insert into your post or page
Use the compressed image as normal. Your page will load much faster.
What File Size Should WordPress Images Be?
| Image Location | Recommended Size | Max Acceptable |
|---|---|---|
| Blog post featured image | Under 200 KB | 500 KB |
| Inline blog images | Under 150 KB | 300 KB |
| WooCommerce product image | Under 300 KB | 500 KB |
| Homepage hero/banner | Under 400 KB | 800 KB |
| Logo (PNG with transparency) | Under 50 KB | 150 KB |
Method 2: Use a WordPress Image Optimization Plugin
If you already have hundreds of images in your WordPress media library, a plugin can compress them in bulk:
Smush (Free)
One of the most popular WordPress image optimization plugins. Compresses images on upload and can bulk optimize existing images.
ShortPixel (Freemium)
Offers excellent lossy compression (similar quality to pngquant). Free for 100 images/month.
EWWW Image Optimizer (Free)
Lossless compression, unlimited images, no account required.
WordPress Speed Results: Before vs After PNG Optimization
| Metric | Before Optimization | After Optimization |
|---|---|---|
| Average PNG size | 2.8 MB | 580 KB |
| Page load time (3G) | 8.2 seconds | 2.1 seconds |
| Google PageSpeed Score | 45/100 | 82/100 |
| LCP Score | 5.8s (Poor) | 1.9s (Good) |
Conclusion
Compressing PNG files before uploading to WordPress is one of the highest-impact improvements you can make for your site's speed, SEO, and user experience. Use compresspngfile.com for new images, and a plugin like Smush or ShortPixel for existing media library images.