Free Converter
Image Compressor
Compress images to reduce file size while preserving quality. Choose quality level and output format.
Drop your image here
Supports PNG, JPG, WEBP, GIF, and more
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Compress images to reduce file size while preserving quality. Choose quality level and output format.
Supports PNG, JPG, WEBP, GIF, and more
Image compression reduces file size by encoding pixel data more efficiently. Lossless compression (PNG's DEFLATE, WebP lossless) preserves every pixel exactly while shrinking the file 20-50%. Lossy compression (JPEG, WebP lossy) achieves much larger reductions (60-90%) by discarding visual information the human eye is poor at noticing. Choosing between them depends on whether the source content tolerates loss — photographs do, line art does not.
This compressor runs in your browser using canvas-based re-encoding. The image is decoded, drawn to a canvas, and re-exported with the chosen format and quality. Output is identical to what any web app's compression pipeline produces. No upload happens; files stay on your device.
For maximum compression efficiency, modern formats (WebP, AVIF) outperform older formats (JPEG, PNG) by 20-50%. The trade-off is browser support — WebP is universal in modern browsers but AVIF is still rolling out. For broad compatibility, JPEG remains the safe choice for photos and PNG for graphics.
Smaller images load faster, which directly improves page speed metrics, mobile data usage, and user experience. Core Web Vitals (Largest Contentful Paint in particular) penalize sites with large hero images. Compression is the cheapest single optimization for image-heavy pages.
Compression also reduces bandwidth costs. Sites that serve millions of images per day save measurable amounts of egress when each image is 50% smaller. CDN bills, mobile data, and energy consumption all benefit. The reduction is essentially free — a one-time encoding step with no maintenance cost.
Upload, choose quality, download the smaller file.
JPEG compression uses 8×8 block DCT plus quantization plus Huffman coding. Quality factor (1-100) controls quantization aggressiveness; quality 90 produces files visually indistinguishable from the source for most photos.
WebP combines VP8 (lossy) or VP8L (lossless) with predictive transforms. WebP at quality 80-85 typically produces files 25-35% smaller than JPEG at quality 90 with equivalent visual quality.
AVIF uses AV1 video codec for image encoding, producing the smallest files among modern formats. Browser support is broad in 2024+ but not universal; check target browser compatibility before relying on AVIF.