The only WordPress image optimizer that works from your posts list instead of the media library. Pick the pages that matter, see the cost upfront, convert in one click. One credit per image — not per thumbnail size.
First conversion free · then 1 credit per image · NitroShock credits
Why NitroImg
Convert images on the pages that matter — not your entire 10,000-image media library. Target specific posts, pages, or products.
A single image with 7 thumbnail sizes still costs 1 credit. Competitors charge per size — that same image costs them 7 credits.
All thumbnail sizes are generated from the original high-resolution file, not from WordPress's pre-downscaled versions. Sharper results at every size.
See exactly how many credits each conversion will use before you click Convert. No surprise charges, no batch-and-pray.
Original JPEG and PNG files stay on disk. WebP versions are saved alongside them. One-click rollback per image, per post, or site-wide.
No .htaccess rewrites. No picture-tag wrappers. Direct URL swap in post content with automatic srcset filtering for responsive images.
Comparison
| Feature | NitroImg | ShortPixel / Imagify |
|---|---|---|
| Conversion scope | Page by page | Entire media library |
| Credit cost | 1 per image | 1 per thumbnail size |
| Thumbnail source | Original file | Pre-downscaled copy |
| Cost preview | ✓ Before converting | After converting |
| URL replacement | Direct swap + srcset | .htaccess or picture tags |
| Rollback | ✓ Per image | Varies |
| Free trial | ✓ First image free | Limited quota |
| Pricing model | Pay-per-use credits | Monthly subscription |
Workflow
Upload the plugin, activate it, and enter your NitroShock license key under Settings → NitroImg. Adjust WebP quality if you want (default 82 is optimal).
You'll see a new "Convert Images" row action on every post, and a WebP status column. Use bulk actions to select multiple posts at once.
The conversion modal shows every image on those pages with thumbnails, file sizes, and the total credit cost. Uncheck anything you want to skip.
Hit Convert. The progress bar shows per-image status and byte savings in real time. URLs in post content are swapped automatically.
All images now serve as WebP with srcset support. Changed your mind? One-click rollback per image restores the original.
Credit Cost
Credits are shared across all NitroShock plugins. Your first conversion is free — no credit card required.
Install NitroImg, convert the pages that matter most, and see the difference in your next Lighthouse score.
