Choose the right format
JPG is usually efficient for photographs. PNG preserves sharp graphics and transparency but may be larger. WEBP can reduce web image size while supporting transparency and modern browser delivery.
Image compression guide
Image Compression Guide: JPG, PNG, WEBP, Quality, and Target Size
Learn how to reduce image file size while preserving visual quality, including format choice, quality settings, target size, previews, and batch workflows.
Reviewed by FormatNest Editorial Team. Updated August 19, 2026.
Quality is a tradeoff
Lossy formats reduce file size by discarding information. Start around 80-88 quality for photos, inspect a preview at the intended display size, and lower quality only when the size reduction is worth the visible change.
Use a target size when a platform requires it
When an upload limit says 200 KB or 2 MB, use Resize Image by KB or a target-size workflow. Reducing dimensions can be more effective than lowering quality alone.
Batch workflow
Select multiple images, apply the same output and quality settings, review each before-and-after size, then download individual files or a ZIP archive. Keep the originals until the batch is verified.
Primary reference: FormatNest image compression tools. This guide is educational and does not replace professional advice.