How to Compress Images Without Ruining Quality
A practical guide to choosing image formats, quality settings, and dimensions for faster websites.
Why image size matters
Large images are one of the most common causes of slow pages. Compression reduces transfer size, improves load time, and can help Core Web Vitals without changing the visible dimensions of an image.
The goal is not always the smallest possible file. It is the smallest file that still looks good at the size where visitors will see it.
Choose the right format
WebP is a strong default for photographs and mixed graphics because it usually produces smaller files than JPEG at similar visual quality. JPEG remains useful when broad compatibility or a familiar workflow matters.
- Use WebP for most website photographs and banners.
- Use JPEG for photos when WebP is not suitable.
- Keep PNG for transparency, screenshots, and sharp interface graphics.
A sensible quality setting
Start around 80% quality, inspect the preview, then reduce it gradually. Hero images may need a higher setting, while thumbnails often tolerate more compression.
Resizing an oversized image usually saves more space than lowering quality alone. Do not serve a 4000-pixel image in a 600-pixel card.
Privacy-friendly browser compression
Toolara’s Image Compressor processes the file inside your browser. The image is not uploaded to Toolara, which keeps the workflow quick and suitable for private assets.