Image compression guide
A practical guide to reducing image file size while keeping enough quality for forms, websites, email, and social media.
Start with the right format
Use JPG for photos, PNG for screenshots and transparent graphics, and WebP when you want a modern web-friendly format. If the goal is a smaller upload, try JPG or WebP for photos and keep PNG for images that need transparency.
Use target size carefully
A strict target like 100KB is useful for upload forms, but very large photos may need lower quality or smaller dimensions. Start with 200KB or 100KB, then reduce maximum width if the result is still too large.
Resize before lowering quality too far
If a photo still looks too large after compression, reduce the maximum width before pushing quality very low. Smaller dimensions often preserve a cleaner result than aggressive quality reduction.
Keep private files local
Browser-side compression is best for IDs, application photos, internal screenshots, and private documents. PicZip processes selected files locally and does not upload image files.
Batch repeated work
For product photos, blog images, and website assets, use the same target size and export all results as one ZIP. This keeps repeated optimization work fast and consistent.
Ready to try it? Open the compressor.