Compression · Knowledge
How to Reduce Image Size Without Losing Quality
“Without losing quality” usually means “without a visible drop for the intended display size.” True bit-perfect preservation means lossless formats that may not hit aggressive size targets.
Quick take: Best path: resize to the pixels you need, then compress at a high/medium quality setting once from a master.
1. Resize to real needs
A 4000px photo displayed at 1200px wastes megabytes. Use the Image Resizer for exact dimensions, then compress.
2. Choose the right encode
Photos: JPG or lossy WebP at a careful quality. UI/screenshots: PNG or lossless WebP. Do not crush quality to fix a dimension problem.
3. Compress once
Open the Image Compressor or a format tool (JPG/PNG/WebP), tune the slider, download, and stop. Re-compressing the download stacks artifacts.
Key points
- Pixels first, then quality.
- One careful encode beats many harsh ones.
- Lossless when visual perfection matters more than size.
Open a compressor
Shrink files privately in your browser — pick a category, then a format tool when you know the extension.
Shrink photos and graphics in your browser — format-specific tools for JPG, PNG, WebP, HEIC, and AVIF.
Related compression guides
Related quality guides
Related concepts
FAQ
Will lossless always be smaller?
No. Lossless often stays larger than a good lossy photo encode. Use lossless for masters and sharp graphics.
What tool should I open first?
Resize if dimensions are huge, then use the Image Compressor or JPG/WebP compressor pages.
Browse all compression guides, compressors, or quality guides.