How to Compress Images for a Website (Faster Pages, Free)

Images are the #1 cause of slow websites. Here's how to compress them for fast pages and better SEO — free.

Images are usually the heaviest thing on a web page — and the number-one cause of slow loading. Compressing them cuts load time, improves Core Web Vitals and helps SEO, with no visible quality loss. Here's how to compress images for a website the right way, free.

Why it matters for SEO

Page speed is a ranking factor, and large images tank it — hurting Largest Contentful Paint especially. Faster pages also convert better and bounce less. Compressing images is one of the highest-impact, lowest-effort speed wins there is.

Resize, then compress

Two steps, in order: resize to the width the image actually displays (a 4000px photo shown at 800px is wasted bytes), then compress. Together they can cut file size by 80–90% with no visible change. Doing only one leaves easy savings on the table.

How to compress for web (free)

Step 1 — Open the compressor at sjpt.io.

Step 3 — Resize to the display width, then compress (or set a target size).

Step 4 — Download and upload to your site.

No watermark, no sign-up.

Format tips

Use WebP where you can — smaller than JPG/PNG at the same quality, with transparency. JPG for photos, PNG only for graphics needing transparency. Lazy-load below-the-fold images so they don't block the first paint.

Frequently asked questions

Resize to the display width, then compress (or set a target size) with JPT AI, and upload the result. Free.

Yes — smaller images speed up pages, which improves Core Web Vitals and rankings.

WebP where supported (smallest), JPG for photos, PNG only for graphics needing transparency.

Not visibly — resize plus sensible compression cuts size dramatically with no noticeable change.

Key takeaways

Resize to display size, then compress (WebP where possible) to cut image weight 80–90% and speed up your site. Free at sjpt.io. Compress for Web Free →