Open Resizo and upload your image
Drag and drop, paste from clipboard, or click to browse. Works with JPG, PNG, WebP, and GIF.
Enter the Instagram dimensions
Type the width and height from the table above (e.g. 1080 × 1080 for a square post). Unlock aspect ratio to enter both values independently.
Choose JPG quality and download
Set quality to 80–90 for Instagram (higher than that offers no visible benefit). Click Download and your file is ready to post.
The ideal Instagram post size is 1080×1080 px for square, 1080×1350 px for portrait (4:5), and 1080×566 px for landscape. Portrait posts get the most feed real estate and tend to perform best.
Instagram Stories should be 1080×1920 px (9:16 aspect ratio). This fills the full screen on all modern smartphones. The same dimensions apply to Reels thumbnails.
Use Resizo — it applies bicubic interpolation inside your browser so there's no server compression. Set output quality to 85–90 for JPG. Instagram will re-compress the image when uploaded, so starting with a high-quality source is important.
No. All processing happens in your browser using the HTML5 Canvas API. Your images never leave your device — no server, no cloud, no privacy risk.
Free, instant, private. No sign-up. Works on mobile and desktop.
Open Resizo Image Resizer →