Squoosh.app Compress & Optimize Images for FREE | Reduce Image Size Without Losing Quality

What is Squoosh used for?

The main purpose is to make images smaller without noticeably reducing their quality. Squoosh says the image processing happens locally on your device, so the images aren’t uploaded to a server.

For your WordPress websites, this can be particularly useful for:

🖼️ Compressing featured images
🚀 Making your website load faster
📱 Optimizing images for mobile
🔍 Reducing image file size before uploading to WordPress
🌐 Converting JPG/PNG images to WebP or other formats
📐 Resizing very large images
💾 Saving storage and bandwidth

For example:

Before:
featured-image.jpg → 2.5 MB

After:
featured-image.webp → 150–300 KB

The exact reduction depends on the image and compression settings.

How to use Squoosh
1. Open Squoosh

Go to:

Squoosh.app

You’ll see “Drop OR Paste” on the page.

2. Add your image

You can either:

Drag an image onto the page
Click the page and select an image
Paste an image

For example, upload:

my-thumbnail.jpg

3. Compare the original and compressed image

Squoosh gives you a visual comparison so you can check whether the compressed image still looks good.

This is useful because you don’t have to blindly choose a compression level—you can visually inspect the result.

4. Choose the output format

This is one of the most useful parts.

Depending on the image, you can choose formats such as:

WebP — excellent choice for most website images
AVIF — can provide very small files with good quality
JPEG — useful for compatibility
PNG — useful when you need lossless quality/transparency

For your WordPress website, I’d generally start with WebP.

5. Resize the image

If your original image is huge, don’t just compress it—resize it too.

For example, suppose you have:

6000 × 4000

but your website only displays the image around:

1200 × 800

There is little benefit in uploading the 6000×4000 version.

Resize it to something appropriate, such as 1200px wide, and then compress it.

6. Adjust quality

You can lower the quality until you find a good balance between:

Image quality ↔ File size

For example:

Version Approx. size Quality
Original JPG 2.5 MB Very high
Compressed JPG 700 KB High
WebP 300 KB High
Highly compressed WebP 150 KB Good

These numbers are examples—the actual result depends on the image.

⭐ Recommended settings for your WordPress thumbnails

Since you use WordPress and create thumbnails/featured images, I’d use this workflow:

Image → Squoosh → Resize → WebP → Compress → Download → Upload to WordPress

For a typical website thumbnail:

Recommended starting point:

Format: WebP
Width: 1200px or around the actual display size
Quality: 75–85
Keep the original aspect ratio
Check the image visually before downloading

For large photographs, you can often go lower if the image still looks good.

🔥 Why Squoosh is especially useful for your website

If your WordPress site contains lots of images, uploading uncompressed images can make pages unnecessarily heavy.

For example:

Without optimization

Image 1 = 2 MB
Image 2 = 1.8 MB
Image 3 = 3 MB
Image 4 = 2.2 MB

Total = 9 MB

After optimization:

Image 1 = 250 KB
Image 2 = 200 KB
Image 3 = 350 KB
Image 4 = 280 KB

Total ≈ 1.08 MB

That’s a substantial reduction.

Squoosh specifically describes its purpose as reducing image size while maintaining quality, and it performs the processing locally on your device.

One important thing

Squoosh is primarily an image optimizer, not a full WordPress optimization system. It won’t automatically optimize every image already sitting in your WordPress Media Library.

If you want, I can also show you
the exact Squoosh settings I recommend for your BoldBliss WordPress website (featured images, thumbnails, banners, and article images) so you can get small file sizes without making the images look blurry.