Image Compressor
Reduce image file size while maintaining visual quality. Adjust the compression level and preview the result before downloading.
Drop an image here or click to upload
Supports JPG, PNG, WebP, BMP
📖 How to Use
Upload an image, adjust the quality slider (lower = smaller file size), select the output format, and click Compress. Compare the before and after previews, then download the compressed image.
Why Compress Images?
Large image files slow down websites, eat up storage, and make emails bounce. A single uncompressed photo from a modern smartphone can be 5-10MB — multiply that across a website with dozens of images and page load times skyrocket.
Google uses page speed as a ranking factor, so unoptimized images directly hurt your SEO. Studies show that 53% of visitors abandon a page that takes more than 3 seconds to load. Compressing images is one of the easiest performance wins.
Our compressor lets you visually compare quality before and after, so you can find the sweet spot between file size and visual quality. Most images can be compressed 60-80% with no visible difference.
Compression Explained
Lossy Compression
Removes some image data to achieve smaller files. JPG uses lossy compression. At 70-80% quality, the difference is usually invisible to the human eye.
Lossless Compression
Reduces file size without losing any data. PNG supports lossless compression. The file is smaller but pixel-perfect identical to the original.
WebP Format
Google's modern format offers 25-35% smaller files than JPG at equivalent quality. Supported by all major browsers since 2020.
Quality Slider
Lower values = smaller files but more quality loss. For web use, 70-80% is the sweet spot. For print, keep it at 90%+.
Compression Best Practices
Best Quality Settings by Use Case
Web pages: 70-80% quality strikes the ideal balance between visual fidelity and load speed. Most visitors will not notice any difference from the original, yet file sizes shrink by 60-80%. Run your pages through Google PageSpeed Insights after compressing to confirm the improvement.
Email attachments: 60-75% quality keeps images under typical email size limits (25MB for Gmail, 20MB for Outlook). If you are sending multiple photos, compress each to 70% and consider resizing them to 1200px wide as well.
Print projects: Stay at 90-95% quality. Print requires higher resolution and more detail than screens, so aggressive compression can introduce visible banding in gradients and skin tones.
Social media: 75-85% quality works well. Platforms like Instagram and Facebook re-compress your uploads anyway, so starting with a moderately compressed file avoids double-compression artifacts.
When to Use Each Format
Choose JPG for photographs and images with smooth gradients. JPG excels at compressing real-world imagery with millions of colors.
Choose PNG when you need transparency or pixel-perfect accuracy — logos, icons, screenshots, and graphics with sharp edges and text.
Choose WebP for the best of both worlds. WebP supports transparency like PNG and compresses photographs 25-35% smaller than JPG. If your audience uses modern browsers, WebP is almost always the right call. You can convert existing images to WebP with our format converter.
Batch Optimization Strategies
When optimizing an entire website, start with the largest images first — they deliver the biggest performance gains. Sort your image folder by file size and work from the top down. For product catalogs with hundreds of photos, establish a consistent quality setting (e.g., 75% JPG) and apply it across the board rather than tweaking each image individually.
Testing Compressed Images Before Deployment
Always preview compressed images at their actual display size, not zoomed in. A 1200px-wide hero image viewed at 100% looks very different from the same image zoomed to 400%. Check for artifacts around text, sharp edges, and areas with subtle gradients. Our built-in before-and-after comparison makes this easy — toggle between the original and compressed versions to spot any issues before you download.
Format Comparison for Compression
| Format | Type | Transparency | Best For | Typical Savings |
|---|---|---|---|---|
| JPG | Lossy | No | Photos, gradients, real-world imagery | 60-80% at quality 70-80 |
| PNG | Lossless | Yes (alpha) | Logos, icons, screenshots, text | 10-30% (lossless only) |
| WebP | Both | Yes (alpha) | Web images, modern browsers | 25-35% smaller than JPG |
Typical savings vary depending on image content, dimensions, and the original file size. Results shown are averages for standard photographic content.
Frequently Asked Questions
What quality level should I use?
For websites and social media, 70-80% quality is ideal — the files are much smaller with minimal visible difference. For professional photography or print, stay at 90-95%. Below 50% you'll start seeing noticeable artifacts.
Does compression change image dimensions?
No. Compression only reduces file size, not pixel dimensions. If you need to change width and height, use our Image Resizer tool instead.
Are my images uploaded anywhere?
No. All compression happens in your browser using the Canvas API. Your images never leave your device — complete privacy guaranteed.