Image Compressor

Compress Images Online — Free, Instant & Private

Image compression is the process of reducing a file's size by encoding its data more efficiently. When you compress an image online, you're telling the encoder to discard some visual information that the human eye can't easily detect — resulting in a smaller file that looks nearly identical to the original. Our free image compressor uses the browser's native Canvas API to perform this compression locally, meaning your files never leave your device.

There are two types of image compression: lossless and lossy. Lossless compression (used by PNG) preserves every pixel perfectly but achieves modest size reductions. Lossy compression (used by JPEG) achieves dramatic size reductions by permanently discarding some image data — but at quality settings of 70–85%, the difference is invisible to the naked eye. Our compressor uses JPEG lossy compression, which is the industry standard for web images.

Why Image Compression Matters for SEO & Performance

Google's Core Web Vitals — specifically Largest Contentful Paint (LCP) — measure how quickly the main content of a page loads. Images are almost always the largest elements on a page, making them the primary target for optimization. A page with uncompressed images might score poorly on LCP, directly hurting its Google search ranking.

According to Google's PageSpeed Insights, images account for an average of 50–60% of a webpage's total byte size. By compressing images before uploading them to your website, you can dramatically reduce page weight without any visible quality loss. A typical product photo at 3MB compressed to 200KB represents a 93% reduction — and at 75% JPEG quality, the images look identical.

For ecommerce stores specifically, page speed has a direct impact on revenue. Amazon found that every 100ms of latency cost them 1% in sales. Shopify stores with optimized images consistently outperform competitors in both search rankings and conversion rates. Use our image compressor before uploading any product photo.

How to Choose the Right Quality Setting

The quality slider in our compressor controls the JPEG quality level from 10% to 100%. Here's a practical guide:

• 85–95%Hero images, portfolio photos, images where quality is paramount. Reduction: 20–40%.
• 70–85%Product images, blog photos, social media content. Reduction: 50–70%. Recommended for most use cases.
• 50–70%Thumbnails, preview images, email attachments. Reduction: 70–85%.
• Below 50%Visible compression artifacts appear. Only use for very small icons or low-priority images.

Compress Images for Specific Platforms

Different platforms have different image size requirements and recommendations:

• Shopify: Product images should be under 500KB. Use 75–80% quality. See our Shopify image guide.
• WordPress: Featured images under 200KB for fast loading. Use 70–80% quality. See our WordPress image guide.
• Email: Images in emails should be under 100KB to avoid spam filters. Use 60–70% quality. See our email compression guide.
• Instagram: Instagram recompresses uploads anyway, so 80% quality is sufficient. See our Instagram size guide.
• Google PageSpeed: Aim for images under 200KB for a good LCP score. See our website speed guide.

After Compressing — What's Next?

Compression is often just the first step. After compressing your image, consider:

• Resize: Use our image resizer to set exact pixel dimensions for your platform.
• Convert to WEBP: WEBP achieves 25–35% smaller files than JPEG at the same quality. Use our JPG to WEBP converter.
• Remove EXIF: Strip GPS and device metadata with our EXIF remover before sharing.
• Check quality: Use our image quality checker to verify the output meets your standards.