Image Compressor — Reduce Image Size Online
Reduce JPG, PNG and WebP file size instantly — adjust quality, preview side-by-side, and download. Browser-based, nothing uploaded.
Also convert images with WebP to JPG or PNG to JPG.
How to Compress an Image Online
Why Compress Images?
This image compressor works as an online image size reducer, JPG compressor, and PNG optimizer for web developers, content creators, and anyone who needs to reduce image file sizes without installing software or uploading files to a third-party service.
Large images are one of the most common causes of slow websites. A page that takes more than 3 seconds to load loses over half its visitors on mobile. Compressing images reduces file size without significant loss of visible quality — making sites faster and improving Google rankings. Google's Core Web Vitals score, specifically the Largest Contentful Paint (LCP) metric, is directly affected by image size. Uncompressed images are a leading cause of poor LCP scores, which can suppress search rankings. Compressing images to the minimum acceptable quality is one of the most impactful and immediate improvements available to any website.
The tool uses the browser's built-in HTML5 Canvas API to re-encode your image at the chosen quality setting. All processing happens locally on your device — your images are never uploaded to any server. The side-by-side preview shows both the original and compressed image at actual size so you can judge quality before downloading. The savings stats show the original size, compressed size, bytes saved, and percentage reduction so you can make an informed decision about the right quality level for your specific image.
For bloggers and content marketers publishing multiple images per article, image compression is a workflow step that pays dividends on every post. A hero image that starts at 3MB can typically be reduced to under 200KB at 75% quality with no perceptible visual difference at screen resolution. Social media thumbnails, product photos in e-commerce, and gallery images in portfolio sites all benefit substantially from compression before upload.
- Faster page load — smaller images download faster, especially on mobile
- Better SEO — Google uses page speed as a ranking factor
- Lower bandwidth — reduces hosting costs and data usage
- Better Core Web Vitals — improves LCP (Largest Contentful Paint) scores
Compression Tips
- JPG at 70–80% — ideal for photos. Barely visible quality loss, significant size reduction.
- PNG — use for images with text, logos, or transparency. PNG compression is lossless.
- WebP — best overall format. Smaller than JPG at the same quality, supports transparency.
- Start at 70% quality and reduce until the preview looks acceptable for your use case.