Free Image Compressor
Reduce image file size by up to 80% while maintaining visual quality. Optimize PNG, JPG, and WebP images instantly in your browser. No upload required — 100% private and secure.
Compress Images
JPG, PNG, WebP supported
Why Compress Images?
Image optimization is critical for modern web performance and user experience
Faster Website Loading
Large images are the #1 cause of slow page load times. Compressed images load 3-5x faster, improving your Core Web Vitals scores and SEO rankings. Google prioritizes fast-loading websites in search results.
Mobile-Friendly
Mobile users often have limited data plans. Smaller images mean faster loading on 4G/5G networks and reduced data consumption. Your visitors will thank you for respecting their bandwidth.
Lower Hosting Costs
Smaller images reduce bandwidth consumption and storage requirements. This translates to lower hosting bills and faster CDN delivery. Save money while improving performance.
Better SEO
Page speed is a confirmed Google ranking factor. Optimized images improve your Lighthouse scores, Core Web Vitals (LCP, FID, CLS), and overall search engine rankings.
Email Attachments
Most email services limit attachment sizes to 25MB. Compress images before sending to avoid rejection errors and ensure your emails arrive quickly without delays.
Social Media
Platforms like Instagram, Facebook, and Twitter compress images on upload. Pre-compressing gives you control over quality and prevents unpredictable compression artifacts.
How Image Compression Works
Understanding the technology behind efficient image optimization
File Analysis
Your browser reads the image file and decodes it into raw pixel data. The algorithm analyzes color distribution, complexity, and optimal compression strategy.
Smart Compression
Advanced algorithms reduce file size by removing invisible data, optimizing color palettes, and applying intelligent lossy compression to preserve visual quality.
Quality Control
The compression engine balances file size reduction with perceived quality. You control the quality slider to find the perfect balance for your needs.
Export
The optimized image is encoded in your chosen format (JPG, PNG, or WebP) and downloaded directly to your device. No server ever sees your files.
Image Compression Best Practices
📐 Choose the Right Format
JPG/JPEG: Best for photographs and images with many colors. Supports lossy compression for small file sizes. Cannot have transparent backgrounds.
PNG: Ideal for graphics, logos, screenshots, and images requiring transparency. Larger files but lossless quality. Supports alpha channel.
WebP: Modern format with superior compression. Up to 30% smaller than JPG/PNG with similar quality. Supported by all modern browsers (95%+ coverage).
🎚️ Quality Settings Guide
90-100%: Near-lossless quality. Use for hero images, product photos, or when quality is critical. Only 10-20% size reduction.
75-85%: Optimal balance. Recommended for most web images. Invisible quality loss with 50-70% size reduction. This is the sweet spot.
60-70%: Aggressive compression. Good for thumbnails, background images, or when file size is critical. Minor quality degradation visible on close inspection.
Below 60%: Extreme compression. Only use for non-critical images where file size is paramount. Visible compression artifacts.
📏 Resolution & Dimensions
Don't upload images larger than needed. If your website displays images at 800px width, there's no benefit to uploading 4000px originals.
Recommended sizes:
- Hero images: 1920-2560px width
- Product images: 800-1200px width
- Thumbnails: 300-400px width
- Blog images: 1000-1400px width
Resize before compressing for maximum file size reduction (up to 90% smaller).
🔄 When to Use Each Method
Lossless Compression: Reduces file size by removing metadata and optimizing encoding without quality loss. Use for archival, medical images, or when quality cannot be compromised. Smaller savings (10-30%).
Lossy Compression: Removes imperceptible visual information to achieve dramatic size reductions (60-80%). Use for web images, social media, and general content where minor quality trade-offs are acceptable.
Resizing: Combine with compression for maximum savings. Always resize first, then compress.
Technical Details & Specifications
Supported Formats
- Input: JPG, JPEG, PNG, WebP, GIF, BMP, TIFF
- Output: JPG, PNG, WebP
- Max File Size: Limited only by your device's memory (typically 100MB+)
- Batch Processing: Compress multiple images simultaneously
Compression Algorithms
- JPG: DCT-based compression with chroma subsampling
- PNG: DEFLATE compression with adaptive filtering
- WebP: VP8 predictive coding (lossy) or lossless compression
- Color Space: sRGB, RGB, RGBA support
Privacy & Security
- ✅ 100% client-side processing (Canvas API + Web Workers)
- ✅ No files uploaded to servers
- ✅ No tracking or analytics on images
- ✅ Works completely offline
- ✅ EXIF data preserved or removed (your choice)
Browser Compatibility
- ✅ Chrome 90+ (Recommended)
- ✅ Firefox 85+
- ✅ Safari 14+
- ✅ Edge 90+
- ✅ Opera 75+
- ⚠️ IE11 not supported
Frequently Asked Questions
Is this image compressor really free?
Yes, 100% free forever. There are no hidden costs, premium tiers, or usage limits. All processing happens in your browser, so we don't have server costs to pass on to you. Compress unlimited images without registration or payment.
Are my images safe and private?
Absolutely. Unlike other online compressors, your images never leave your device. All compression happens locally in your browser using JavaScript and Canvas API. We never see, store, or have access to your files. It's as private as using desktop software, but more convenient.
What's the difference between lossy and lossless compression?
Lossless: Compresses files without removing any visual information. The image is pixel-perfect identical to the original. Smaller savings (10-30% reduction).
Lossy: Removes imperceptible details to achieve much smaller files (60-80% reduction). The human eye typically cannot detect quality loss at 75-85% quality settings. This is what we recommend for web use.
Will compression reduce image quality?
It depends on your settings. At quality levels above 75%, most people cannot see any difference from the original. The compression removes data that the human eye cannot perceive. For web use, 80% quality provides an excellent balance: images look great but are 50-70% smaller. You have full control via the quality slider.
Should I use JPG, PNG, or WebP?
JPG: Best for photos and complex images with many colors. Excellent compression.
PNG: Use for graphics, logos, screenshots, and when you need transparency.
WebP: The best of both worlds. Smaller than JPG/PNG with similar or better quality. Supports transparency. Use WebP for modern web projects (95% browser support). We recommend WebP for optimal performance.
How much smaller will my images be?
Typical results:
• PNG → WebP at 80%: 60-80% size reduction
• JPG → WebP at 80%: 30-50% size reduction
• JPG → JPG at 80%: 40-60% size reduction
• PNG → PNG (lossless): 10-30% size reduction
Combining resizing with compression can achieve 90%+ size reduction while maintaining visual quality.
Can I compress images in bulk?
Yes! Upload multiple images at once, and they'll all be compressed with your chosen settings. All files are processed simultaneously in your browser, limited only by your device's performance. There's no artificial limit on batch size.
What happens to EXIF data?
EXIF data (camera settings, GPS location, timestamps) is typically removed during compression to reduce file size and protect privacy. If you need to preserve EXIF data, use our lossless PNG compression option or save at maximum quality.
Does this work offline?
Yes! Once the page loads, all compression happens locally in your browser. You can disconnect from the internet and continue using the tool. This also guarantees your images never leave your device.
What's the maximum file size I can compress?
There's no artificial limit. The only constraint is your device's available memory. Most modern computers can easily handle images up to 100MB. Very large images (4K+ resolution, >50MB) may take longer to process but will work fine.
Why is WebP better than JPG and PNG?
WebP is a modern image format developed by Google that provides superior compression. It combines the best features of both JPG (efficient lossy compression) and PNG (transparency support). WebP images are typically 25-35% smaller than equivalent JPGs and 50-80% smaller than PNGs, with identical visual quality. Browser support is now excellent (95%+ of users), making it the best choice for modern websites.
How does this compare to Photoshop or other tools?
Our browser-based compressor uses the same underlying algorithms as professional tools (Canvas API with optimized encoding). For web use cases, the results are virtually identical to Photoshop's "Save for Web" feature. The main advantages: it's free, requires no installation, works on any device, and is more convenient for quick optimizations.