How it works
Is my image uploaded anywhere?
No — never. Everything runs inside your browser using the Canvas API. Your image never leaves your device and nothing is sent to any server.
What's the maximum image size?
Limited only by your browser and device memory. Most browsers handle images up to 30–50MP without issue. Very large files may take a moment to process.
Will resizing reduce quality?
Shrinking an image never reduces visual quality noticeably. The Quality slider controls JPEG/WebP compression — keep it above 80% for best results.
Why use WebP output?
WebP files are typically 25–35% smaller than JPG at the same visual quality. Ideal for websites — Google PageSpeed and Core Web Vitals reward it.
What does "Lock aspect ratio" do?
Changing width auto-calculates height (and vice versa) to keep the same proportions. Unlock it to stretch an image to non-proportional dimensions.
What are the social media presets?
Common platform-specific dimensions like Instagram post (1080×1080), YouTube thumbnail (1280×720), Twitter header (1500×500), and more — all measured in pixels.