# Find the Large Images Slowing Your Site > Scan your media library for oversized image files above your size threshold. Find the heavy images hurting Core Web Vitals, then compress or resize fast. - Canonical URL: - Markdown URL: Category: Storage feature A handful of oversized files can drag down your whole site. ThumbPress scans your library for images above the size you set - measuring the real original file - so you know exactly which ones to compress or resize. ## A Few Heavy Files Slow Down Everything Oversized images are the quiet reason pages crawl and PageSpeed scores drop. ### Multi-Megabyte Uploads A single page with 20 unoptimized images can weigh 10-40 MB. Editors upload straight from a phone or camera, and those full-resolution files land in your library untouched. Impact: 10-40 MB pages from a few big files ### Hidden Behind Scaling WordPress may display a scaled-down copy, but the heavy original still sits on your server and gets served in plenty of places. A 5 MB upload shown at 90 KB is still 5 MB on disk. Impact: The real weight hides behind the scaled view ### Core Web Vitals Hit Big images blow up Largest Contentful Paint and trigger PageSpeed's "properly size images" warning - costing you rankings and conversions. Impact: LCP failures and PageSpeed penalties ## How Large-Image Detection Works Set a threshold, scan, and act on the files that actually matter. ### Steps 1. **Set** — You choose a size threshold - the default is 1 MB - so ThumbPress knows what counts as too big for your site. 2. **Measure** — It checks the original file for every image, so an upload WordPress auto-scaled is still reported at its true full size. 3. **Act** — You get a list of oversized files with the option to trash them or send them straight to compression. ### Find Heavy Images Fast Quickly identify oversized files and optimize the images consuming unnecessary storage and resources. #### Detect Large Images Scan your media library to quickly find oversized images that may be slowing down your website. Review file sizes and optimize individual images directly from one place. ## Size Up Your Library with Confidence Find the real heavyweights, then deal with them fast. - Set your own size threshold (default 1 MB) - Always measures the true original file - Bulk or single scan with live progress - Trash or send straight to compression - Live oversized-image count on your dashboard - Runs on your own server, nothing sent out ## Frequently Asked Questions ### How do I find the largest images on my site? Set a size threshold (1 MB by default) and run the scan. ThumbPress lists every image whose original file exceeds it, so the heaviest offenders are surfaced in one place. ### Does it measure the scaled image or the original? Always the original. A 5 MB photo that WordPress auto-scaled to a 90 KB display copy is still reported as 5 MB, because that full file remains on your server and still gets served. ### What do I do with the large images it finds? Straight from the results you can trash a file or send it to compression, so fixing PageSpeed's "properly size images" warning is a click away rather than a manual hunt. ### How do oversized images affect Core Web Vitals? Large image files inflate Largest Contentful Paint - a core Web Vitals metric - and slow the whole page. Trimming the heaviest files is one of the fastest ways to lift your score. ### Can I change the size threshold? Yes. 1 MB is the default, but you can raise or lower it to suit your site - a photography portfolio and a documentation site have very different ideas of "too big". ### Should I delete large images or compress them? Compress first. Most oversized files are simply unoptimised rather than unwanted, and compression usually solves the problem without you losing anything. Save deletion for files nothing on the site actually uses. ### Does scanning my library slow the site down? No. Each image's file size is recorded once and refreshed whenever the file changes, so the report reads stored values instead of measuring thousands of files on every page load. ### Does it look at anything outside the media library? No. It reports on WordPress attachments only, so theme assets and files uploaded outside the media library are left alone. ## Ready to Cut the Heavy Files? Get started today. Love it or get a refund within 30 days. ## About ThumbPress ThumbPress is a WordPress plugin for image optimization and thumbnail management, built by Codexpert. It runs on your own server: compression, WebP/AVIF conversion and cleanup all happen locally, with no third-party image API and no per-image credits. - All features: - Pricing: - Documentation: - Blog: - Support: - WordPress.org listing: