What aspect ratios do social platforms use?
Instagram square 1:1, Instagram portrait 4:5, Stories 9:16, TikTok 9:16, YouTube thumbnail 16:9, Pinterest pin 2:3, Xiaohongshu cover 3:4. Pick the platform preset and the resizer handles the math.
Will Fit add black bars to my image?
Fit pads with the background color you choose (white, dark, or neutral). Use Fill instead if you want to crop to fill the entire frame without padding.
Are my images uploaded to your server?
No. All images are processed locally in your browser using JavaScript and WebAssembly. Your files never leave your device, and we have no infrastructure that could receive them.
Can I compress multiple images?
Yes. You can drop a batch of images (or an entire folder) and download the compressed results as a single ZIP file with the original folder structure preserved.
Which formats are supported?
JPG, PNG, WebP and AVIF are supported when available in your browser. The Auto mode picks the smallest modern format your browser can encode.
Can I compress images to a specific size?
Yes. Use the
Compress to KB tool to target 100KB, 200KB, 500KB, 1MB or any custom size.
Do I need an account?
No. There is no signup, no login, and no payment. The tool works as soon as the page loads.