Image Compressor
Compress JPEG, PNG, and WebP images directly in your browser.
Drop an image here or click to select
About This Tool
Reduce image file size by adjusting quality and output format. Supports JPEG, PNG, and WebP inputs with WebP or JPEG output. See the original and compressed sizes side by side with a real-time preview. Everything runs locally in your browser using the Canvas API — your images never leave your device.
What you provide
An image file (JPEG, PNG, or WebP) and a quality percentage
What you get
A compressed image file with before/after size comparison
How to Use
- Drop or select an image file (JPEG, PNG, or WebP, up to 20 MB).
- Adjust the quality slider and choose the output format (WebP or JPEG).
- Click Compress, review the size reduction, and download the result.
Image Format Comparison (2026)
| Format | Compression | Transparency | Animation | Browser Support | Best For |
|---|---|---|---|---|---|
| JPEG | Lossy | No | No | Universal | Photos, gradients, complex images |
| PNG | Lossless | Yes (alpha) | No | Universal | Screenshots, logos, text with sharp edges |
| WebP | Lossy + Lossless | Yes | Yes | 96%+ (all modern) | Web images replacing JPEG/PNG |
| AVIF | Lossy + Lossless | Yes | Yes | 90%+ (modern) | High quality at low file size |
| GIF | Lossless (256 colors) | Yes (1-bit) | Yes | Universal | Simple animations, legacy support |
| SVG | Vector (XML) | Yes | Yes (CSS/SMIL) | Universal | Icons, logos, scalable graphics |
Why Image Size Matters for Web Performance
Images are typically the largest assets on a webpage and the primary driver of Largest Contentful Paint (LCP), one of Google's Core Web Vitals. A hero image of 1 MB can add 3 or more seconds of load time on a 3G mobile connection (average bandwidth ~1.5 Mbps). Google's PageSpeed Insights penalizes pages with oversized images and explicitly recommends serving images in next-gen formats like WebP or AVIF instead of JPEG or PNG.
Mobile devices now account for over 60% of global web traffic, and many users in emerging markets are still on 3G or congested 4G networks. Compressing a 2 MB JPEG to a 200 KB WebP — a 90% reduction — requires no visible quality sacrifice at 80% quality setting and can move your LCP from 4.5 seconds to under 2.5 seconds, crossing Google's "Good" threshold. For e-commerce sites, every 100ms of latency improvement correlates with measurable conversion rate gains.
Beyond performance, smaller images reduce hosting bandwidth costs and CDN transfer fees. A site serving 50,000 images per month at 1 MB average vs 200 KB average saves 40 GB of bandwidth monthly — meaningful at scale.
Image Optimization Checklist
- Choose the right format: WebP for most web images, AVIF for maximum compression, PNG only when lossless transparency is required.
- Resize before uploading: never serve a 4000px image when the layout displays it at 800px.
- Quality 75–85 is the sweet spot for lossy formats — imperceptible quality loss with 50–70% file size reduction.
- Use srcset and sizes attributes to serve different resolutions to different screen densities.
- Lazy-load below-the-fold images with loading="lazy" to defer non-critical network requests.
- Serve images through a CDN with edge caching to reduce latency for geographically distributed users.
- Strip EXIF metadata (camera model, GPS coordinates, timestamps) — it adds kilobytes and leaks private information.
Frequently Asked Questions
- How does browser-based image compression work?
- The tool draws your image onto an HTML Canvas element, then re-encodes it using the Canvas toBlob API at the quality level you choose. Lower quality means more aggressive lossy compression and smaller files.
- Will compression reduce my image quality?
- Yes, lossy compression discards some visual data. At 70-80% quality, the difference is usually imperceptible. Below 50%, artifacts like banding and blurring become noticeable, especially on gradients and text.
- Is this tool free to use?
- Yes. This tool runs entirely in your browser with no account required. Your data never leaves your device.
- What is the maximum file size I can compress?
- The tool accepts files up to 20 MB. Since processing happens in your browser, very large images may be slow on older devices. For best performance, keep images under 10 MB.
- Does this work on mobile?
- Yes. The tool is fully responsive and works on any device with a modern browser. You can select images from your camera roll or file manager.
Learn More
How Image Compression Works: Formats, Quality, and Performance
Learn how JPEG, WebP, and PNG compression work, what quality settings mean, and how image optimization impacts web performance and Core Web Vitals.
7 min read