Image Compressor Tutorial
Detailed guide, best practices, and FAQ
Use Cases
The image compressor is useful for website image optimization, email attachment slimming, social media uploads, and mobile image adaptation. Use it to compress multi-MB originals down to KB while keeping acceptable quality — all locally in your browser.
Features
- Multi-format: JPG, PNG, WebP, GIF conversion
- Adjustable quality: 0-100% quality slider
- Real-time preview: before/after comparison with file sizes
- Batch processing: drag multiple images and compress at once
- Local processing: images never uploaded, privacy-friendly
Examples
Example 1: Scenario 1: Compress a 5MB camera original to under 200KB for blog images to speed up page loading.
Example 2: Scenario 2: Email attachment exceeds size limits — compress images before sending.
Example 3: Scenario 3: Convert PNG screenshots to WebP — 30% smaller with no visible quality loss.
Best Practices
- For web images, prefer WebP — about 30% smaller than JPG
- Photo quality 75-85% is usually indistinguishable to the eye
- For icons/screenshots, use PNG or lossless WebP
- Download immediately after compression to free browser memory
FAQ
Will compression reduce image quality?
Depends on the quality setting. 100% is nearly lossless; 75-90% is hard to distinguish; below 50% shows visible blurring. WebP is smaller at the same quality.
What image formats are supported?
Input: JPG, PNG, WebP, GIF. Output: JPG, PNG, WebP. GIF output loses animation and keeps only the first frame.
Is there a size limit?
Theoretically unlimited, but constrained by browser memory. Single images should be under 20MB to avoid crashes.