Image Compressor
Compress JPG, PNG and WebP images directly in your browser. 100% private - your files never leave your device. Batch process and download all as a ZIP.
Lower = smaller file, lower quality. 60-80% is the sweet spot for most images.
Drag & drop images here, or click to select files
How to Compress Images Online (Without Uploading)
Image compression reduces the file size of your photos and graphics without significantly affecting their visual quality. This is essential for faster website load times, smaller email attachments, and staying within storage limits on platforms like GitHub Pages, Netlify, or free WordPress hosts. Our Image Compressor uses the HTML5 Canvas API and the browser-image-compression library to perform this entirely client-side, meaning your images are processed on your own device and never uploaded to any server.
Why Compress Images?
- Faster websites: Google considers page speed a ranking factor. Compressing images can cut page load time by 50-80%, which directly improves SEO and reduces bounce rate.
- Lower bandwidth costs: If you're hosting on Netlify, Cloudflare Pages, or GitHub Pages, you have bandwidth limits. Smaller images mean lower bills and longer free-tier usage.
- Better user experience: Mobile users on slow 3G/4G connections abandon pages that take more than 3 seconds to load. Compressed images keep them engaged.
- Storage savings: Email providers like Gmail have a 25MB attachment limit. Compressing lets you send more images in a single email.
JPG vs PNG vs WebP - Which Format to Choose?
The output format you pick depends on the content of your image:
- JPEG is best for photographs and images with many colors and gradients. It uses lossy compression, so some quality is lost, but at 70-80% quality the loss is barely visible to the human eye while reducing file size by 60-80%.
- PNG is best for logos, icons, screenshots and images with sharp edges or transparency. It uses lossless compression, so quality is preserved, but file sizes are larger than JPEG.
- WebP is the modern format supported by all current browsers (Chrome, Firefox, Safari, Edge). It produces files 25-35% smaller than JPEG at equivalent quality. Use WebP if you can - it's the future of web images.
Recommended Quality Settings
For most use cases, a quality setting of 70% produces excellent results. Here are our recommendations for specific scenarios:
- Website hero images: 75-80% quality, JPEG or WebP
- Blog post images: 65-70% quality, WebP
- Thumbnails: 60% quality, WebP, with max width 400px
- Email attachments: 70% quality, JPEG
- High-quality portfolio: 85-90% quality, JPEG
Is It Really Private?
Yes - completely. When you select an image in this tool, it is loaded into your browser's memory using the FileReader API. The compression happens on the Canvas element, which is a built-in browser feature. The compressed image is then offered as a download via a blob URL. At no point is the image sent over the network. You can verify this by opening your browser's Developer Tools (F12) → Network tab, and you'll see no upload requests when you compress an image.
Tips for Best Results
- Compress images before uploading to your website or CMS, not after.
- For photographs, prefer WebP at 70% over JPEG at 80% - same visual quality, smaller file.
- Set a max width of 1920px for full-width hero images - most screens can't display more.
- If your image has text or sharp lines, use PNG to avoid artifacts around the edges.
- Always keep your original uncompressed image as a backup.