Byteslim Image Optimizer compresses each image you upload and serves next-generation WebP and AVIF formats automatically — with a bulk optimizer for the library you already have, and a restorable copy of every original.
hero-banner.jpg1.8 MB → 240 KBproduct-04.png920 KB → 118 KBA single unoptimised hero image can outweigh every script and stylesheet on the page combined. Visitors on mobile feel it first, and Google measures it directly through Largest Contentful Paint — one of the Core Web Vitals that feeds your search ranking.
New uploads are handled the moment they arrive, and the bulk optimizer takes care of the library you already have — without changing how you work.
Adjustable JPEG quality and PNG level, with metadata stripping and progressive encoding. PNG stays lossless and transparency is preserved.
Generates next-generation copies of the full image and every thumbnail size. AVIF is typically 20–30% smaller again than WebP.
Browsers that support next-gen formats receive them; everything else silently falls back to the original. Nothing breaks.
Processes your whole Media Library in batches with a live progress bar — and resumes exactly where it stopped if you close the tab.
Every original is kept before optimization, so any image can be rolled back from the Media Library without re-uploading it.
See exactly how many images were optimized, how much disk space you saved and your average compression ratio — with per-format coverage.
Resize oversized originals down to a maximum you choose — usually the single biggest saving on a media library. Thumbnails are rebuilt and the original kept restorable.
Off-screen images fade in from a tiny blurred preview, while the first images stay eager and high-priority so your Largest Contentful Paint is never delayed.
Generate accurate, SEO-friendly alt text for every image with an AI vision model — automatically on upload or in bulk. Bring your own key; unlimited images.
Upload the plugin to WordPress and activate it like any other. No code, no config files, nothing to wire up.
Choose the processing engine — Auto prefers Imagick and falls back to GD — then set your quality and enable WebP or AVIF.
Process the images already in your library once. From then on every new upload is optimized automatically as it arrives.
A clean, unified admin — every screen shares the same layout, so nothing feels bolted on.
WebP coverage71% of libraryAVIF coverage12% of libraryThe free edition is a complete, working optimizer — not a trial. Premium adds the automation and safety net that busy sites and agencies need.
| Feature | Free | Premium |
|---|---|---|
| JPEG & PNG compression | ✓ | ✓ |
| Metadata stripping & progressive JPEG | ✓ | ✓ |
| Optimize every thumbnail size | ✓ | ✓ |
| WebP conversion & front-end delivery | ✓ | ✓ |
| Bulk optimizer with resume | ✓ | ✓ |
| Savings dashboard, logs & server status | ✓ | ✓ |
| WP-CLI commands & read REST API | ✓ | ✓ |
| Image scaling — resize oversized originals | — | ✓ |
| Lazy load with blur-up placeholders (LCP-safe) | — | ✓ |
| AVIF conversion | — | ✓ |
| Server-level WebP/AVIF delivery (whole site) | — | ✓ |
| AI-generated alt text (accessibility & SEO) | — | ✓ |
| Media cleanup — duplicates & broken records | — | ✓ |
| Backups & one-click restore of originals | — | ✓ |
| Scheduled background optimization | — | ✓ |
| Folder scanning beyond the Media Library | — | ✓ |
| WooCommerce, Elementor & page-builder delivery | — | ✓ |
| Unlimited image size & bulk batches | — | ✓ |
| Image health report & advanced analytics | — | ✓ |
| Use on 1 / 5 / unlimited sites | — | ✓ |
| Priority support | — | ✓ |
Cloud optimizers charge every year, metered by credits, bandwidth or visits — because they run the servers. Byteslim Image Optimizer runs on your own server, so it's a one-time licence with unlimited images. Here's what the same few years cost.
| What you pay | Byteslim Image Optimizer | ShortPixel | Optimole | EWWW |
|---|---|---|---|---|
| Pricing model | One-time · lifetime | Subscription | Subscription | Subscription |
| Images per month | Unlimited | Credits | Visits / MB | Credits |
| Runs on your own server | ✓ | — | — | Partial |
| AI alt text | Included (BYO key) | +$60 / yr | — | — |
| Year 1 | $69 | ~$100 | ~$99 | ~$80 |
| After 3 years | $69 | ~$300 | ~$297 | ~$240 |
| After 5 years | $69 | ~$500 | ~$495 | ~$400 |
Figures are the competitors' advertised unlimited / entry annual plans and may change — shown to illustrate recurring vs one-time cost, not an exact quote. Byteslim Image Optimizer Personal shown ($69, 1 site); Freelancer (5 sites) and Agency (unlimited sites) stay one-time too.
Every plan is unlimited images with no credits, no bandwidth caps and no monthly fees — because it all runs on your own server. Start free, then pay once for a lifetime licence or a low yearly price.
The complete optimizer: compression, WebP conversion & delivery, bulk optimizer with resume, savings dashboard, logs and WP-CLI. No signup, no time limit.
1 website · or $29/year · lifetime updates
5 websites · or $59/year · lifetime updates
Unlimited websites · or $99/year · lifetime updates
Already running the free version? Upgrading keeps every setting and all of your optimization history.
No. A file is only replaced when the optimized version is genuinely smaller, PNG compression is lossless and transparency is preserved. Premium also keeps a restorable backup of every original, so you can roll any image back.
It's a complete working optimizer with no time limit and no signup — compression, WebP conversion and delivery, the bulk optimizer, the dashboard and logs are all included. Premium adds AVIF, backups, scheduling and builder delivery.
Those conversions are skipped automatically and ordinary compression still runs. The plugin's Server Status screen shows exactly which formats your host supports, so there's no guesswork. AVIF generally needs PHP 8.1+ with GD, or a recent Imagick build.
Compression and WebP/AVIF generation work for every image regardless of where it's used. Serving next-gen formats inside WooCommerce, Elementor, Gutenberg blocks and page builders is a Premium feature, because those render images outside standard WordPress markup.
The opposite — smaller images are the point. Optimization happens on upload or during a bulk run, not on every page view, and large libraries are processed in memory-efficient batches so the work never blocks your site.
Yes. Premium is a separate package that replaces the free plugin — your settings and optimization history carry straight over. Nothing is lost and nothing needs reconfiguring.
Yes — wp sio status, wp sio stats, wp sio optimize <id> and wp sio bulk. There's also a read REST API under the sio/v1 namespace for administrators.
We help directly. Reach WP DeveloperHub on WhatsApp at +1 (316) 477 2620 or email contact@wpdeveloperhub.com and we'll get you installed and configured.
Ready for Byteslim Image Optimizer Premium? Request your license, ask a question, or get setup help — we reply within one business day.
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