Compress Images Online Free – Reduce JPG, PNG & WebP Size Without Losing Quality

Image Compression Guide

Understanding a few basics helps you get the smallest files with no visible quality loss. Here is everything you need to know to choose the right settings.

Lossy vs. lossless compression

Lossy compression (JPEG, WebP) permanently discards image data the human eye is least sensitive to — fine texture, subtle color gradients in busy areas. Done well, it can shrink a photo by 80–90% with no visible difference. The quality slider controls how aggressive this is: lower values discard more.

Lossless compression (PNG) rearranges data more efficiently without discarding anything, so the decompressed image is pixel-for-pixel identical. The trade-off is much larger files — a photo saved as PNG is often 5–10× the size of a visually identical JPEG. Use lossless only when exact pixels matter.

When to use JPEG, PNG or WebP

JPEG is the workhorse for photographs — anything with natural gradients: portraits, landscapes, product shots. It is universally supported everywhere, from ancient browsers to email clients. It does not support transparency.

PNG is right for screenshots, logos, diagrams, text-heavy graphics and anything needing a transparent background. Its lossless nature keeps sharp edges crisp where JPEG would smear them.

WebP typically produces files 25–35% smaller than an equivalent-quality JPEG and also supports transparency. It is supported by every modern browser and is the best default for web images today. Choose JPEG over WebP only when the file must open in older software or picky email clients.

Recommended quality settings

Websites and blogs: quality 70–80, resized to a max width of 1920 px (1280 px for content images inside articles). This is the sweet spot where files get dramatically smaller but readers notice nothing.

Social media: quality 80, max width 1280 px. Platforms recompress whatever you upload anyway, so starting from a clean, appropriately sized file gives their algorithm the best input.

Email attachments: quality 65–75, max width 1280 px. A batch of vacation photos at these settings usually fits comfortably under the common 25 MB attachment limit.

Archival or print: keep quality at 90+ and don't resize — or stick with PNG. Once detail is discarded by lossy compression it cannot be recovered, so keep an original copy of anything irreplaceable.

A practical workflow: start at quality 75, click the thumbnail to compare before and after at full size, and only raise quality if you can actually see a difference. Most people are surprised how low they can go.