How to reduce image file size without ruining quality

You’re uploading a product photo to your website. The image looks great, but it’s 4.8 MB. Your page takes 6 seconds to load on mobile. Half your visitors bounce before they see the product.

Image compression fixes this. The trick is knowing how much compression you can get away with before the quality drop becomes visible.

The short answer

For photos (JPGs): you can typically cut file size by 50-70% before anyone notices. A 4.8 MB photo becomes a 1.5 MB photo. At normal viewing sizes, they look identical.

For screenshots and graphics (PNGs): converting to WebP gives you 60-80% smaller files with no visible change, because WebP handles flat colors and sharp edges better than PNG’s compression.

How to compress

Open the image compressor
Drop your image
Pick a compression level (Low, Medium, or High)
Check the before/after sizes and download

Start with Medium. If the result looks fine at 100% zoom, you’re done. If you need every pixel perfect, switch to Low.

What each preset does

Low compression: Minimal re-encoding. File size drops 10-30%. Best for photography portfolios or print-quality images where subtle details matter.

Medium compression: The sweet spot. File size drops 40-60%. Indistinguishable from the original at normal viewing sizes. Best for websites, email, and social media.

High compression: Aggressive re-encoding. File size drops 60-80%. Photos look slightly softer at full zoom. Best for thumbnails, previews, or anywhere file size matters more than pixel-level quality.

Why images are so large

Digital cameras and phones capture far more detail than screens can display. A 12-megapixel iPhone photo is 4032 x 3024 pixels. Most people view it on a screen that’s 1920 pixels wide or smaller. That’s more than double the resolution needed.

Compression works by reducing this excess resolution and optimizing the encoding. Text and edges stay sharp. Gradients and textures get slightly simplified. The result looks the same at the size people actually view it.

Common use cases

Website images: Faster load times directly improve SEO and conversion rates
Email attachments: Stay under the 10-25 MB limit most email providers enforce
Form uploads: Many web forms cap file size at 2-5 MB per image
Social media: Platforms re-compress your uploads anyway; pre-compressing gives you more control over the result
Cloud storage: Smaller photos mean more storage for the same subscription tier

PNG vs JPG vs WebP

JPG: Best for photos. Lossy compression, small files, universal support
PNG: Best for screenshots, logos, and anything with text. Lossless but larger files
WebP: Best of both worlds. Smaller than JPG and PNG at the same quality. Supported by all modern browsers

If your PNG screenshots are huge, try converting to WebP with the image converter. You’ll often get a 70% size reduction with zero visible difference.

Privacy

Compression runs entirely in your browser. Your images never leave your device. No upload, no server, no account.

How to convert HEIC to JPG (when the problem is format, not size)
How to compress a PDF without losing quality (same compression principles applied to documents)