Image Compressor — Compress PNG, JPEG & WebP Online

About Image Compressor — Compress PNG, JPEG & WebP Online

Image Compressor reduces file size of JPEG and PNG images using quality optimization and lossless/lossy compression techniques. Optimize images for faster web loading without a noticeable drop in visual quality.

FAQ

How much will my image be compressed?

JPEG compression at 80% quality typically reduces size by 50–70% with minimal visible quality loss.

Is there quality loss when compressing PNG?

PNG uses lossless compression by default. Reducing file size for PNG may involve quantizing colors, which can reduce quality in gradients.

Should I compress images before uploading to a CMS?

Yes. Pre-compressing images reduces storage costs and speeds up page load, even if your CMS also applies compression.

What is the difference between lossy and lossless image compression?

Lossless compression (PNG, GIF) removes redundant data in the file without changing any pixels — the decompressed image is bit-for-bit identical to the original. Lossy compression (JPEG, WebP in lossy mode) permanently discards image data that is less perceptible to the human eye, achieving much higher compression ratios. For photographs, lossy compression at quality 75–85% is typically undetectable by most viewers while reducing file size by 60–80%. For screenshots, graphics, and text, use lossless compression to avoid artifacts.

How does compression quality affect image file size and visual quality?

Compression quality is usually expressed as a percentage (0–100) or a scale (1–10). The relationship is non-linear: going from quality 100 to quality 80 typically reduces file size by 60–70% with barely visible quality reduction. Going from quality 80 to quality 60 further reduces size by 30–40% with noticeable but often acceptable quality loss. Below quality 50, artifact-like blocking and blurring become clearly visible. For web images, quality 75–85 is the standard recommendation balancing size and visual quality.