Image Compressor
Upload a JPEG or PNG image, adjust the quality slider, and download a smaller file — all processing happens in your browser with no server upload required.
Click to upload or drag & drop an image here
Supports JPEG and PNG
Frequently Asked Questions
How does image compression work?
This tool uses your browser's Canvas API to redraw your image and export it at a lower JPEG quality setting. JPEG compression works by discarding some fine image detail that is less noticeable to the human eye, reducing file size significantly. For PNG files, since PNG is a lossless format, this tool converts them to JPEG for maximum compression. All processing happens entirely in your browser — your images are never uploaded to any server.
What is the best image format for websites?
JPEG is best for photographs and images with many colors because it achieves small file sizes at acceptable quality. PNG is better for images with transparency, logos, and screenshots because it's lossless. WebP is the modern choice — it produces files 25–35% smaller than JPEG at equivalent quality and supports transparency. For hero images and thumbnails, JPEG at 75–85% quality strikes the best balance between file size and visual quality.
How much should I compress images for web?
For web use, aim to keep images under 200KB for most use cases. Hero images can go up to 500KB if needed. For social media posts, keep images under 1MB to avoid platform recompression. JPEG quality between 70–85% typically reduces file size by 60–80% with minimal visible quality loss. Google's Core Web Vitals guidelines recommend images be as small as possible while remaining visually acceptable.