How ImgBunny Achieves Near-Lossless Compression
ImgBunny leverages industry-leading open-source codecs compiled to WebAssembly, running entirely inside your browser. Each format is handled by a specialist encoder optimized for quality-to-size ratio.
Mozilla's JPEG encoder. Up to 40% smaller files vs. standard JPEG at identical visual quality.
Lossless PNG optimizer. Reduces file size 10–30% with zero pixel changes.
Google's modern format. 25–35% smaller than JPEG at equivalent quality.
Next-gen format. Up to 50% smaller than JPEG with near-identical visual output.
Frequently Asked Questions
What does 'no quality loss' really mean?
It means the compressed image looks identical to the original to the human eye. Compression removes data that is imperceptible — such as metadata, redundant color data, and information below the threshold of human visual perception.
What quality setting should I use?
85% quality is the recommended default. It typically reduces file size by 60–75% with no noticeable visual difference. For web thumbnails or social media previews, 75% is often sufficient.
Which format gives the smallest file size?
AVIF generally produces the smallest files at any given quality level, followed by WebP, then JPEG. PNG is best for images with transparency or sharp-edged graphics like logos.
Can I set a maximum file size target?
Yes. ImgBunny's Size Target feature automatically finds the best quality level that keeps your file under a specific size in KB — useful for platforms with strict upload limits.
Is my data safe?
100%. All compression runs in your browser using WebAssembly. No image data is ever sent to a server. Your files stay on your device at all times.