Quick answer
Instagram posts often use 1:1 or 4:5 ratios, while stories and reels use 9:16. Resize before posting to avoid awkward cropping.
Recommended tool
Use Resize Image for Instagram for this workflow. The linked tool page includes the active converter, steps, privacy notes, FAQs, and related format helpers.
Step-by-step workflow
- Open the recommended converter tool.
- Add your file or content.
- Choose the output settings that match the upload requirement.
- Download the result and compare quality, file size, and compatibility.
Related free tools
Privacy note
Keep the source file saved until the output is verified. Browser-local tools avoid uploads where possible, and heavy conversions use encrypted temporary processing only when the format requires it.