On most WordPress sites, images make up the majority of page weight. One uncompressed hero photo can be larger than your theme, plugins and fonts combined. Fixing images is usually the fastest way to improve Largest Contentful Paint (LCP), the Core Web Vitals metric most sites fail.
An image optimization plugin does three jobs automatically: compress images on upload, convert them to modern formats like WebP or AVIF, and bulk-process the images you already have. The differences are in quality, limits and how you pay. I have compared 9 Best WordPress image Optimization Plugins. Compression quality, WebP and AVIF support, free limits and real pricing for WordPress sites.
Short answer: ShortPixel gives the best balance of quality and price, with an Unlimited plan at $9.99 a month. Imagify is the simplest, and its free tier covers small blogs. EWWW Image Optimizer is the best free option because it compresses on your own server with no monthly cap. Optimole suits sites that want optimization and a CDN in one.
What an Image Plugin Should Do
- Lossy and lossless compression with a quality level you control.
- WebP and AVIF conversion, served only to browsers that support them.
- Bulk optimization of your existing media library.
- Resizing of oversized uploads (nobody needs a 6000px image on a blog).
- Backups of originals, so you can restore or re-compress later.
- Optional CDN to serve images from servers near your visitors.
Best Image Optimization Plugins Compared
| Plugin | Free tier | Paid from | WebP | AVIF | Processing |
|---|---|---|---|---|---|
| ShortPixel | Small monthly credit allowance | Unlimited $9.99/mo or $99.90/yr | Yes | Yes | Cloud |
| Imagify | 20 MB/month (about 200 images) | $4.99/mo billed yearly | Yes | Yes | Cloud |
| EWWW Image Optimizer | Unlimited local compression | $80/yr (Standard) | Yes | Paid | Local or cloud |
| Optimole | Free tier by monthly visits | Paid by monthly visits | Yes | Yes | Cloud + CDN |
| Smush | Unlimited basic compression | WPMU DEV membership | Pro | Pro | Cloud |
| TinyPNG (Compress JPEG & PNG) | 500 compressions/month | Pay per image after that | Check current version | Check current version | Cloud |
| Converter for Media | Free WebP conversion | Pro for AVIF | Yes | Pro | Local |
| LiteSpeed Cache (image module) | Free quota via QUIC.cloud | QUIC.cloud credits | Yes | Yes | Cloud |
How I Picked These
I compared visual quality at similar file sizes, support for WebP and AVIF, how each handles your existing library, free limits, cost for a blog adding around 200 to 500 images a month, and whether originals are kept.
8 Best WordPress Image Optimisation Plugins
ShortPixel Image Optimizer
Best for: best quality per kilobyte. Price: free credits, Unlimited $9.99/mo or $99.90/yr, one-time packs available. Processing: cloud
ShortPixel consistently produces small files that still look sharp. You choose lossy, glossy (a quality-friendly middle ground that suits most blogs) or lossless compression.
It converts to WebP and AVIF, bulk-processes old images, resizes big uploads and keeps backups. The Unlimited plan now covers all ShortPixel tools, including its CDN, which makes pricing much simpler than the old credit system.
The free tier is small, so most real blogs will pay.
Best features: glossy compression, WebP and AVIF, unlimited plan, PDF compression.
Pros
- Excellent quality
- Simple unlimited plan
- One-time packs for low-volume sites
Cons
- Small free allowance
Imagify
Best for: simplicity. Price: free 20 MB/month, Growth $4.99/mo, Infinite $9.99/mo (billed yearly). Processing: cloud
Imagify comes from the WP Rocket team and has the cleanest interface. Pick a compression level (Smart compression is the default), turn on WebP or AVIF, and it handles the rest. It pairs neatly with WP Rocket.
The free tier is enough for a small blog adding a few images a week. Bigger libraries need Growth or Infinite, and there is less fine control than ShortPixel.
Best features: Smart compression, WebP and AVIF, WP Rocket integration.
Pros
- Very easy
- Useful free tier
Cons
- Fewer settings
- Free tier fills fast on busy sites
EWWW Image Optimizer
Best for: free unlimited compression. Price: free, Standard $80/yr, Growth $160/yr. Processing: local (free) or cloud (paid)
EWWW can compress images on your own server with no monthly limits and no account, which makes it the best truly free option. It also does WebP conversion and lazy loading.
Local compression uses your server’s CPU, which may be restricted on cheap shared hosting. Paid plans add stronger cloud compression, AVIF, the Easy IO CDN and a performance plugin.
Best features: local compression, WebP, Easy IO CDN (paid), no API key needed.
Pros
- No limits on free version
- Privacy friendly
Cons
- Uses server resources
- Busier settings screen
Optimole
Best for: optimization plus CDN in one. Price: free tier, paid plans by monthly visits. Processing: cloud with CloudFront CDN
Optimole works differently: it serves images from its CDN, resized to each visitor’s screen and converted to the best format on the fly. There is no bulk processing because images are optimized when requested.
Pricing is based on visits, not images, which suits image-heavy sites with moderate traffic. Your images depend on Optimole’s service, and high-traffic sites pay more.
Best features: adaptive resizing, Amazon CloudFront CDN, image offloading, lazy loading.
Pros
- CDN included
- Right size for every screen
Cons
- Traffic-based pricing
- Dependent on the service
Smush
Best for: free basic compression on any size library. Price: free, Pro with WPMU DEV. Processing: cloud
Smush, from WPMU DEV, offers unlimited lossless compression, lazy loading and bulk optimization for free.
That makes it a common first image plugin. WebP, AVIF, stronger lossy compression and the CDN are Pro features. Lossless alone saves much less than lossy, so free users leave a lot of savings on the table.
Best features: unlimited free lossless compression, lazy loading, image resizing.
Pros
- No free limit
- Friendly interface
Cons
- WebP and lossy need Pro
TinyPNG (Compress JPEG & PNG images)
Best for: low-volume blogs. Price: 500 free compressions per month, then pay per image. Processing: cloud
The official TinyPNG plugin uses the well-known TinyPNG/TinyJPG engine, which gives excellent lossy compression. The first 500 compressions each month are free.
Remember that each image size WordPress generates counts, so 500 compressions can mean fewer than 100 uploads. It is simple, with fewer extras than ShortPixel.
Best features: strong lossy compression, simple setup, pay-as-you-go pricing.
Pros
- Great compression
Cons
- Thumbnails use up the free quota
Converter for Media
Best for: adding WebP on top of existing compression. Price: free, Pro for AVIF. Processing: local
Converter for Media focuses on one job: converting your images to WebP (and AVIF in Pro) and serving them to supporting browsers, without changing your image URLs.
It is useful if you already compress images before upload. It does not do regular compression or resizing of originals.
Best features: free WebP conversion, no URL changes, rewrite rules for serving.
Pros
- Free WebP
- Lightweight
Cons
- One job only
LiteSpeed Cache Image Optimization
Best for: sites on LiteSpeed hosting. Price: free quota via QUIC.cloud. Processing: cloud
If you already run LiteSpeed Cache, its built-in image module compresses images and creates WebP and AVIF versions through QUIC.cloud.
It saves you another plugin. The settings live inside an already complex plugin, and heavy users may need QUIC.cloud credits.
More in the best caching plugins guide.
Best features: no extra plugin, WebP and AVIF, integrates with page cache.
Pros
- One less plugin
Cons
- Complex settings
Important note: Do not lazy load your featured or hero image. It is usually the LCP element, and lazy loading it delays the metric you are trying to fix. Most plugins let you exclude the first image or images above the fold.
How to Optimize Images the Right Way (Example with ShortPixel)
- Resize before uploading when you can. A 1600px wide image is plenty for most blog layouts.
- Install ShortPixel and enter your API key.
- Choose Glossy compression, turn on “Create WebP” and “Create AVIF”, and enable “Resize large images” (for example, max 2000px).
- Turn on “Keep backups” so you can restore originals.
- Go to Media > Bulk ShortPixel and optimize your existing library.
- Test a post in PageSpeed Insights and confirm the images are served as WebP or AVIF.
- Add descriptive file names and alt text. That part is for SEO, not speed, and it still matters. More in the WordPress SEO guide.
Pick By Situation
- New blog, no budget: EWWW (local) or Imagify free.
- Growing blog: ShortPixel Unlimited or Imagify Infinite.
- Image-heavy site, moderate traffic: Optimole.
- LiteSpeed host: LiteSpeed Cache’s image module.
- Already compress before upload: Converter for Media for WebP.
Images are one part of the speed puzzle. See how to improve WordPress speed for the rest, and the must-have plugins list for a lean starter stack.
FAQs Related to Best WordPress Image Optimization Plugins
What is the best free image optimization plugin for WordPress?
EWWW Image Optimizer, because it compresses locally with no monthly limit. Imagify’s free tier is easier but capped.
Should I use WebP or AVIF?
Both. AVIF is usually smaller; WebP has slightly wider support. Good plugins create both and serve the best one each browser supports.
Does WordPress optimize images by default?
WordPress resizes images into several sizes, applies modest compression to generated sizes and supports WebP and AVIF uploads. It does not strongly compress or convert your originals, so a plugin still helps.
Will compressing images reduce quality?
Lossy compression removes data, but at sensible settings the difference is not visible on screen. Keep backups if you are unsure.
Can I run two image optimization plugins?
Avoid it. They may compress the same image twice and conflict over WebP delivery. The exception is a converter-only plugin alongside pre-compressed uploads.
Final Verdict
That’s all about the list of best WordPress image optimization plugins.
For most blogs, ShortPixel is the best mix of quality and value, and the Unlimited plan removes the guesswork.
If you want free, use EWWW. If you want simple, use Imagify.
Whichever you pick, set a sensible max width, turn on WebP or AVIF, and keep your hero image out of lazy loading.
