This tool uses your browser's Canvas API to re-encode images at a lower quality setting. JPEG and WebP support lossy compression which significantly reduces file size.
What quality should I use?
80-90% is ideal for most web uses with minimal visible quality loss. 60-70% for thumbnails. 90-100% when quality is critical. Use the preview to decide.
Does compression reduce image dimensions?
No. This tool only reduces file size through quality compression. The pixel dimensions remain exactly the same.
Can I compress multiple images at once?
Yes. Upload multiple images and compress them all with the same quality and format settings. Download individually or all at once.
What formats are supported?
JPEG, PNG, and WebP input. Output can be JPEG, WebP, or PNG. JPEG and WebP offer the best compression with adjustable quality.
How much can I reduce file size?
Typical savings: JPEG 50-80%, PNG 30-60%, WebP 40-70%. Actual results vary by image complexity and quality setting.
Is my image uploaded to a server?
No. All compression is done locally in your browser using Canvas toBlob. Your images never leave your device.
What's the difference between lossy and lossless compression?
Lossy (JPEG, WebP) permanently discards some data for smaller files. Lossless (PNG) compresses without any data loss but produces larger files.