Free image compressor — no upload
Large images are the number-one cause of slow web pages — and slow pages hurt rankings, conversions and user experience. This free tool — built by a Singapore SEO & web agency — compresses and resizes your JPG, PNG or WebP images right in your browser. Drag one in, adjust the quality, and download a much smaller file. Because everything happens locally with the HTML5 Canvas, your image is never uploaded to any server — it’s completely private, with no file-size limits.
Why image size matters for SEO
Google’s Core Web Vitals — especially Largest Contentful Paint — are heavily influenced by how fast your images load, and page experience is a confirmed ranking signal. Oversized images also cost mobile users data and patience: every extra second of load time measurably increases bounce rate. Compressing images is one of the highest-impact, lowest-effort speed wins available. A hero image trimmed from 2 MB to 200 KB loads roughly ten times faster with no visible quality loss.
JPEG, WebP or PNG — which to use?
WebP is the modern choice for most web images — it delivers 25–35% smaller files than JPEG at the same quality and is supported by every current browser. JPEG remains the safe, universal option for photographs. PNG is best only when you need transparency or pixel-perfect graphics like logos and screenshots — it’s lossless, so it doesn’t compress photos well. This tool lets you convert between all three: try exporting a heavy PNG photo as WebP or JPEG and watch the file size drop.
Compress and resize together
The biggest wins come from doing both. There’s no point serving a 4,000-pixel-wide image into a 800-pixel container — you’re sending five times the data users can see. Set a sensible max width (1,600–2,000px is plenty for most full-width web images; 800px for in-content) and compress to around 70–80% quality. That combination typically cuts file size by 80–95% with no perceptible difference. Once your images are optimised, check the whole page with our AI visibility checker.
Compress at the right point in your workflow
Order of operations matters more than most people realise. Always resize to the largest dimensions the image will actually be displayed at before you compress — serving a 4,000px photo into a 600px slot wastes bandwidth no quality setting can recover, because the browser downloads the full file and then shrinks it. Decide the real display size first, resize to it (with a little headroom for high-density screens), then apply compression. Doing it in that order routinely cuts file size by an order of magnitude with no visible loss.
Build the habit into publishing rather than treating it as a periodic clean-up. A single unoptimised hero image can outweigh an entire well-built page, so compressing on the way in stops bloat accumulating. Because this tool works entirely in your browser with no upload, it fits neatly into a fast publishing routine — the kind of speed discipline our web design team bakes into every build.
How image weight feeds Core Web Vitals and rankings
Images are the usual culprit behind a poor Largest Contentful Paint score, the Core Web Vital that measures how quickly your main content appears. Because LCP is most often the hero image, compressing and correctly sizing it is frequently the single highest-impact speed fix you can make. Serving modern formats and appropriately sized files directly improves the field data Google collects, which feeds into ranking.
Don’t neglect the two attributes that stop images hurting other metrics: set explicit width and height so the browser reserves space and avoids layout shift (protecting your CLS score), and use loading="lazy" on below-the-fold images so they don’t block the initial render. Compression handles weight; these attributes handle stability and load order — you want all three.
Frequently asked questions
Is my image uploaded anywhere?
No. All compression happens locally in your browser using the Canvas API — your image never leaves your device and nothing is sent to a server. That also means there’s no file-size or quantity limit.
What quality setting should I use?
For web photos, 70–80% quality is the sweet spot — a large file-size saving with no visible difference. Drop lower for thumbnails or background images where fine detail doesn’t matter. Compare the before and after previews to judge for your specific image.
Does compressing reduce image quality?
JPEG and WebP use lossy compression, so extreme settings can introduce artefacts — but at 70–80% the loss is usually invisible while the file savings are large. Resizing to the dimensions you actually display is lossless in effect and often the bigger win.
What’s the best format for web images?
WebP for most cases — smaller files at equal quality with universal modern-browser support. Use JPEG for maximum compatibility with photos, and PNG only when you need transparency or crisp graphics.
Should I resize before or after compressing?
Resize first. Scale the image down to the maximum size it will actually display at, then compress. Compressing a needlessly large image still leaves you serving far more pixels than the page uses, so resizing is where most of the saving comes from.
Will compressed images look worse on high-resolution screens?
Not if you size them sensibly. For Retina and other high-density displays, export at roughly twice the display dimensions and let compression handle the file size — the extra pixels keep it sharp while smart compression keeps the weight down. Test at the size it’ll appear on the page, not zoomed in.
