Why Compress Images?
Large images slow down websites, consume storage, and fail email size limits. Compression reduces file size while preserving acceptable quality. Lossless compression keeps every pixel; lossy compression trades some detail for smaller files. Our compressor supports both modes and can target a specific file size.
Lossless vs Lossy Compression
Lossless (PNG): No quality loss. Best for graphics, logos, screenshots. Lossy (JPEG): Smaller files, minimal visible loss. Best for photos. Use our target size feature to hit exact KB goals.
How to Compress Images Online
Drag your image, choose mode (lossy or lossless), set quality or target size, and compress. For lossy: optionally set target KB—we recursively adjust quality until the target is met. Max dimension limits resize large images before compression.
Target File Size Feature
Enter desired size in KB (e.g., 200). Our algorithm adjusts JPEG quality in a binary search until output is within 1KB of target. Ideal for web specs or email limits.
Best Compression Settings
Photos: Lossy, 80-90% quality. Graphics: Lossless. Web: 70-85% or use target size. Thumbnails: 50-70% or max dimension 800px.
When to Use Max Dimension
Resize before compress for huge images. 2048px max is good for web. 4096px for high-res. Reduces both dimensions and file size.
Image Compression for Web Performance
Faster page loads improve SEO and user experience. Compress hero images, product photos, and gallery thumbnails. Use our tool to batch-optimize before upload.
Recommended Workflow
1) Resize if needed. 2) Choose lossy for photos. 3) Set target size or quality. 4) Download and replace originals. Test visually before deploying.
常见问题
- Is image compression free?
- Yes. Free, unlimited. Client-side processing.
- What is target file size?
- Enter KB (e.g., 200). We adjust quality until output meets that size. Lossy only.
- Lossless vs lossy?
- Lossless keeps every pixel (PNG). Lossy reduces size more (JPEG) with minimal visible loss.
- Are images uploaded?
- No. Compression happens in your browser.
- Max file size?
- 50MB per image.