Compress Image

What is image compression?

Compress Image optimizes your images by reducing file size with minimal visible quality loss. Smaller, optimized images load faster on websites, use less storage, and are easier to email or share. This tool uses smart compression algorithms tuned for each format.

Compression runs client-side using browser Canvas re-encoding. You can adjust the quality slider to balance file size against visual fidelity, and compare before and after to pick the right setting.

Web developers and content creators use image compression daily to meet performance budgets. Google's Core Web Vitals penalize pages with large, unoptimized images — a single uncompressed 5 MB hero photo can push your Largest Contentful Paint (LCP) past the 2.5-second threshold and hurt search rankings. E-commerce sites with hundreds of product images save gigabytes of bandwidth monthly by compressing to quality 80-85. Email marketers compress images to stay under attachment size limits (typically 25 MB for Gmail, 20 MB for Outlook). Bloggers and social media managers reduce upload times and storage costs without any visible difference in their published content.

The compression behavior depends on the image format. JPG uses DCT-based lossy compression that discards high-frequency detail imperceptible to the human eye — quality 85 typically reduces file size by 40-60% with no visible degradation in photographs. PNG uses DEFLATE lossless compression, preserving every pixel exactly, which makes it ideal for screenshots, logos, and graphics with sharp edges or text. WebP combines lossy and lossless modes and typically produces files 25-35% smaller than equivalent JPG at the same visual quality. For the best results, consider converting PNG photos to WebP using the Convert Image tool before compressing, and use Resize Image to reduce dimensions if the image is larger than needed for its display context. Our image optimization guide covers format selection and quality settings in detail.

Frequently asked questions