Convert Images to WebP.
Page by Page.
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
Not another media library optimizer
Page-First Workflow
Convert images on the pages that matter - not your entire 10,000-image media library. Target specific posts, pages, or products.
One Credit Per Image
A single image with 7 thumbnail sizes still costs 1 credit. Competitors charge per size - that same image costs them 7 credits.
Better Quality
All thumbnail sizes are generated from the original high-resolution file, not from WordPress's pre-downscaled versions. Sharper results at every size.
Cost Before You Commit
See exactly how many credits each conversion will use before you click Convert. No surprise charges, no batch-and-pray.
Non-Destructive
Original JPEG and PNG files stay on disk. WebP versions are saved alongside them. One-click rollback per image, per post, or site-wide.
Clean URL Replacement
No .htaccess rewrites. No picture-tag wrappers. Direct URL swap in post content with automatic srcset filtering for responsive images.
Rename to Match Titles
Turn IMG_4872.jpg into kitchen-remodel.jpg in one click. Every generated size, the scaled original and the WebP sidecars move together, and the image URLs already saved in your pages are rewritten to match. Undo any rename.
Comparison
How NitroImg stacks up
| 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 |
| AI alt text & titles | ✓ Built in | Not included |
| Free trial | ✓ First image free | Limited quota |
| Pricing model | Pay-per-use credits | Monthly subscription |
New in NitroImg
Alt text and titles, written for you
NitroImg now describes your images and writes the alt text for you - on demand from the conversion panel, or automatically the moment a new image hits your media library. Filename-style titles get cleaned up at the same time.
One-Click Alt Text
Generate descriptive alt text for any JPEG or PNG straight from the conversion panel. The result is written back to both the media library and the live image tag in your content.
Clean Titles, Automatically
Filename-style titles like my-photo or IMG_4872 are replaced with a readable title whenever alt text is generated. Titles you wrote by hand are left alone.
Convert + Alt in One Pass
A combined action converts images to WebP and writes alt text in a single run, with one summary at the end. Two jobs, one click, one report.
Automatic on Upload
A new setting writes alt text and a clean title for every new JPEG or PNG upload - independent from WebP conversion, and skipped when an image already has real alt text. Uploads are never blocked.
Bulk Actions
Select multiple posts or pages and run Convert to WebP, Generate Alt Text, or Convert + Alt across all of them at once - three bulk actions, right in the posts list.
Finds What Others Miss
The reworked scanner matches page-builder images inserted without a wp-image class, maps already-converted .webp URLs back to their original attachment, and treats camera-style alt values like IMG_3801 as placeholders to replace - not real alt text.
Workflow
Two clicks from your posts list
Install and add your license key
Upload the plugin, activate it, and enter your NitroShock license key under Settings → NitroImg. Adjust WebP quality if you want (default 82 is optimal).
Go to Posts or Pages
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.
Preview and select
The conversion modal shows every image on those pages with thumbnails, file sizes, and the total credit cost. Uncheck anything you want to skip.
Convert and watch
Hit Convert. The progress bar shows per-image status and byte savings in real time. URLs in post content are swapped automatically.
Done - or roll back
All images now serve as WebP with srcset support. Changed your mind? One-click rollback per image restores the original.
Credit Cost
Simple, predictable pricing
Under 2 MB
2-10 MB
Over 10 MB
Credits are shared across all NitroShock plugins. Your first conversion is free - no credit card required.
Faster pages start with lighter images
Install NitroImg, convert the pages that matter most, and see the difference in your next Lighthouse score.