6 min read
How to Compress Images for the Web (Without Ruining Quality)
Step-by-step advice for shrinking images for faster pages: resize first, pick the right format, then compress — all privately in your browser.
Why image weight matters
Images are often the heaviest part of a page. Oversized files slow Largest Contentful Paint, waste mobile data, and make forms reject uploads. Compression is not about making everything look worse — it is about matching quality to the display size.
A simple 3-step workflow
Follow this order for the best results:
- Resize to the largest size you actually show (for example 1600px wide for a blog hero)
- Choose a format: WebP for modern sites, JPG for maximum compatibility, PNG for sharp UI
- Compress with a quality slider — start high, then lower until the file meets your target
Suggested starting points
Every image is different, but these starting points work for most screenshots and photos:
- Hero photos: WebP or JPG at ~80–85% quality
- Thumbnails: smaller dimensions matter more than tiny quality differences
- Logos: PNG or lossless WebP — do not crush them with heavy JPG settings
- Form uploads: compress until you are under the stated MB/KB limit
Keep it private
Many “free compressors” upload your files to a server. ImgConvert re-encodes in the browser instead, which is safer for invoices, IDs, medical paperwork, and unpublished product shots.