How to Compress an Image Without Losing Much Quality
Last updated 2026-09-12
Most of a large image's file size can be trimmed with almost no visible quality loss, if you approach it in the right order.
Resize before compressing
If the image is being displayed smaller than its original resolution, resize it down first — this alone often cuts file size dramatically, since fewer pixels means less data regardless of compression.
Choose the right format
Photos compress best as JPG or WebP; flat graphics, logos, and screenshots compress best as PNG or WebP.
Adjust the quality level
For lossy formats (JPG, lossy WebP), a quality setting around 75-85% is usually visually indistinguishable from 100% but meaningfully smaller.
Important Considerations
- Below about 60% quality, compression artifacts (blockiness, color banding) start becoming visible, especially around sharp edges and text.
- Compressing an already-compressed JPG multiple times compounds quality loss — always start from the highest-quality original you have.
- For images with both photographic areas and sharp text/graphics, no single format is perfect — consider which content dominates the image.
Frequently Asked Questions
- What's the single biggest win for reducing file size?
- Resizing to the actual display dimensions — a 4000px-wide photo displayed at 800px wide is wasting well over 90% of its data on detail nobody will see.
- Does compressing a PNG lose quality?
- Standard PNG compression is lossless — it reduces file size without any quality loss, though it compresses less aggressively than lossy formats.