What image format should I use for WordPress?

WebP is the best format for WordPress — 25–35% smaller than JPEG at similar quality. WordPress has supported WebP uploads since version 5.8.

What image size should I upload to WordPress?

Upload at the largest display size needed — usually 1920px for hero images or 1200px for blog content. WordPress generates smaller sizes automatically.

NexusCompress · Reduce image size for WordPress & websites

Images are the biggest contributor to slow page loads. Compressing before upload improves Core Web Vitals and search rankings — even if you use a WordPress plugin.

Why pre-compression matters with plugins

Plugins like Smush or ShortPixel compress after upload. If you upload a 6 MB JPEG, the plugin starts from a bloated file. Pre-compress to 400 KB first and the result is much better.

Recommended settings by use case

Use case	Format	Max width	Quality	Target size
Hero / full-width banner	WebP	1920 px	82%	150–400 KB
Blog post images	WebP	1200 px	82%	80–200 KB
Product photos	WebP	1200 px	85%	100–300 KB
Thumbnails	WebP	600 px	80%	30–80 KB
Logo (transparency)	WebP / PNG	300–600 px	90%	10–50 KB

Why WebP for WordPress?

WordPress accepts WebP since version 5.8. WebP is 25–35% smaller than JPEG at similar quality — one of the fastest ways to improve PageSpeed Insights scores.

Core Web Vitals: Keep hero images under 200 KB in WebP to improve LCP (Largest Contentful Paint).

How to compress WordPress images

Open NexusCompress.
Select Website — WebP, 1920px wide for hero images.
For blog content: Custom WebP, 82% quality, max 1200 px.
Batch process a folder and download as ZIP.
Upload to WordPress Media Library.

Existing Media Library images

For retroactive bulk compression, use ShortPixel or Imagify. For new uploads, pre-compress with NexusCompress first.

Does compression affect SEO?

Yes — positively. Faster loads improve Core Web Vitals (a ranking factor) and reduce mobile bounce rate. Always add descriptive alt text in WordPress separately.

Compress for WordPress →

Frequently asked questions

What format should I use for WordPress?

WebP — smaller than JPEG, supported by all modern browsers and WordPress 5.8+.

What size should I upload?

1920 px for heroes, 1200 px for blog content. WordPress auto-generates smaller sizes.

Do I still need a plugin if I pre-compress?

Pre-compressing is the most important step. Plugins add a second pass with smaller gains.

How large should a hero image be in KB?

Under 200 KB in WebP for fast LCP scores.