Image Compressor
Reduce your image file size instantly in your browser without losing noticeable quality.
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How Image Compression Works
Image compression reduces file size by removing redundant pixel data or approximating colors with fewer bits. There are two types: lossless (no quality loss) and lossy (small quality reduction for large size savings). For most web images, lossy compression at 70–85% quality is imperceptible and cuts file size by 60–80%.
When to Compress Images
- Website images: Large images are the #1 cause of slow page load times. Google PageSpeed flags images over 100KB on mobile pages
- Email attachments: Most email services cap attachments at 10–25MB
- Social media uploads: Platforms re-compress your images anyway — pre-compressing gives you control
- Storage: Compress photo libraries to save cloud storage space
JPEG vs PNG vs WebP for Web
- JPEG: best for photos, supports lossy compression, no transparency
- PNG: best for graphics/logos, lossless or lossy, supports transparency
- WebP: Google's modern format, 25–35% smaller than JPEG at equivalent quality, supports transparency
What compression level should I use?
For web images: 70–80% quality is the sweet spot — significant file savings with no visible quality loss to most viewers. For print: stay at 90%+ quality to retain fine detail. For thumbnails or social media previews where the display size is small: even 60–65% quality looks fine and cuts file size dramatically.
Does compressing an image reduce its dimensions?
Compression and resizing are different operations. Compression reduces file size while keeping the same pixel dimensions. Resizing changes the actual width and height in pixels. For the biggest file size reduction, do both: resize to the display dimensions you need (e.g., 1200px wide for a blog header) and then compress. Our Image Resizer tool handles the resizing step.