Image preparation
Social media image resizer
Choose a platform, dimensions and crop mode, then export PNG or JPEG without uploading the image to a server.
Your inputs stay in this browser
Output settings
Choose an image to start
EXIF orientation is applied by the browser decoder.
Frequently asked questions
Is the image uploaded to a server?
No. File reading, preview, cropping and export happen in your browser.
Is a suggested ratio the same as an enforced rule?
No. The ratio range enforced by Postid is shown separately; export dimensions remain your choice.
What are the file and output limits?
To protect browser memory, input is limited to 25 MB and output to 40 megapixels. EXIF orientation is applied by the browser decoder, PNG transparency is preserved, and upscaling a low-resolution source shows a warning.
Continue with the complete workflow
Prepare, validate and publish with Postid.