How to use Social Media Image Resizer
- Drop your images
- Choose the platform size and Fill (crop) or Fit (pad)
- Click Resize and download
About this tool
Each network crops images differently, and uploading the wrong shape can cut off faces or text. Fill crops to the exact shape from the center; Fit keeps the whole image and adds bars in a color you choose. Sizes follow each platform’s 2026 recommendations.
Frequently asked questions
What size is an Instagram post?
1080×1350 px (4:5) for portrait posts, 1080×1080 for square and 1080×1920 for Stories and Reels.
What size is a YouTube thumbnail?
1280×720 px (16:9), under 2 MB.
Fill or Fit: which should I use?
Fill for photos where trimming the edges is fine. Fit for graphics, text or anything that must stay fully visible.
Are my files uploaded to a server?
No. ConvertBrightly processes files with JavaScript inside your browser. Nothing is sent over the network, and the files disappear when you close the tab. You can even disconnect from the internet after the page loads.
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