Image compression: keep files small without losing clarity

Start with dimensions

Oversized pixel dimensions are often the main source of a large file. If an image is displayed at 1200 pixels wide, uploading a 6000-pixel original rarely helps. Resize for the real display size before compressing.

Choose the format for the content

Photos commonly suit WebP or JPEG. Use PNG or WebP when transparency matters. For icons and text screenshots, protect sharp edges first. The wrong format makes the quality-size tradeoff needlessly difficult.

Adjust one variable at a time

Fix the dimensions, then reduce quality gradually. Compare at the intended display size and at 100% zoom, watching faces, text edges, gradients, and high-contrast areas.

Before publishing

• Use a meaningful filename with no sensitive information.
• Test loading on a mobile connection.
• Look for blocking, color banding, and blurred text.
• Keep the original file for a future export.

Takeaway

Effective compression is not about the smallest possible file. It is about making useful, clear content arrive quickly for the people viewing it.