How to Compress Images for a Website
Large images are the number-one cause of slow website load times. This guide covers how to compress images to the right size for web use — the quality level that looks perfect on screen, the format that gives the smallest file, and the resize step most guides skip.
Free Tool
Free Image Compressor
No account required · Free forever
Step-by-Step Guide
- 1
Open the Image Compressor
Go to the free image compressor — no account or sign-up required.
- 2
Upload your image
Drag and drop or click to upload your JPEG, PNG, or WebP file.
- 3
Set the quality level
For photos, 80–85% quality is the sweet spot — visually indistinguishable from the original but 60–70% smaller.
- 4
Check the output file size
The tool shows the compressed file size in real time. Aim for under 200 KB for most web images, under 100 KB for thumbnails.
- 5
Download the compressed image
Download and replace your original. Re-upload to your CMS or website builder.
Who This Is For
Website Owners
Reduce page load time without a developer by compressing images before uploading to WordPress, Shopify, or Squarespace.
Bloggers
Compress featured images and inline photos before publishing to keep posts loading fast on mobile.
E-commerce Sellers
Compress product photos to keep category pages fast — especially important on mobile where conversion rates drop with each second of load time.
Frequently Asked Questions
What file size should web images be?
For hero/banner images: under 300 KB. For blog post images: under 200 KB. For thumbnails and icons: under 50 KB. These are guidelines — the goal is pages that load in under 3 seconds on a mobile connection.
Does compressing images affect SEO?
Yes, positively. Google's Core Web Vitals score includes Largest Contentful Paint (LCP), which is heavily influenced by image loading speed. Smaller images improve LCP scores and can improve search rankings.
What quality setting should I use for web?
80–85% quality for JPEG produces images that look identical to the original at normal viewing sizes on screen. For PNG (lossless format), compression is about removing metadata and optimizing data structure rather than a quality slider.
Should I use JPG or WebP for websites?
WebP is the better choice for modern websites — it is 25–35% smaller than JPEG at equivalent quality and is supported by all major browsers. Use JPEG as a fallback for email and external use where WebP may not be supported.