Image Tools · Guide
Image Compressor Guide: Shrink Files Without Visible Loss
Images make up the bulk of most web pages, and every megabyte you save speeds up loading, reduces bandwidth costs and improves SEO. Compression shrinks image files by removing redundant data, but it trades against quality. Understanding that trade — and picking the right format and quality setting — lets you cut file size dramatically with little visible difference.
In this guide
Why file size matters
Smaller images load faster, rank better in search, and cost less to serve. On mobile networks, a heavy image is often the difference between a visitor waiting or leaving. Compressing before upload is the cheapest performance improvement a site can make.
Quality and the compression trade-off
Lower quality settings discard more visual detail and produce smaller files. The art is finding the highest quality that still looks right — usually 70–85% for photos. Below that, compression artifacts such as banding and blur become visible; above it, you pay in size for detail the eye barely registers.
Choosing a format
JPEG is ideal for photos, WebP delivers excellent quality at small sizes for both photos and graphics, and PNG preserves sharp edges for logos and text. For most web images, converting to WebP at moderate quality gives the best size-to-quality ratio of the three.
Key takeaways
- Compression removes redundant data to shrink files.
- 70–85% quality is the sweet spot for photos.
- WebP usually beats JPEG and PNG on size.
- Compress before upload for faster pages and better SEO.
Frequently asked questions
Does compressing an image reduce its quality?
Only if you push quality too low. At sensible settings — 70–85% — the loss is usually invisible to the eye while the size saving is large.
What is the best format for compressing images?
For most web use, WebP gives the best quality per byte. Use JPEG for compatibility-sensitive photo delivery and PNG for sharp graphics with text.
How much can I compress an image?
A typical photo drops to 30–70% of its original size with no visible change. Screenshots with flat colors compress even more dramatically.
Put these numbers to work
Compress, resize and convert images entirely in your browser.