Pick an image
Drop in a JPG, PNG, WebP, GIF or AVIF. Your browser opens it on your own device; nothing is sent to us.
Free, and no account needed
Free Social Media Image Resizer
Pick an image and the sizes you need, from Instagram stories to LinkedIn banners. Choose what stays in frame, then download each one. It all happens in your browser: nothing is uploaded, and there is no account or watermark.
HOW IT WORKS
Pick, frame, download.
Choose your sizes
Tick every platform size you need, or add a custom one. Crop to fill and click the part that must stay in frame, or fit the whole image with plain margins.
Download each one
Every size previews as you change it. Download the ones you want as JPG, PNG or WebP.
QUESTIONS
Before you upload.
No. The resizing happens in your browser on your own device. The image is never sent to Postally or anyone else, and closing the tab discards it.
Each is the size the platform recommends, checked in November 2026. Instagram's tall post is 4:5 rather than the newer 3:4, because 4:5 is the tallest size that also works when you post through a scheduler. If you need something else, add a custom size.
Your image has fewer pixels than that size, so it has to be enlarged. It will still work, but it will not be as sharp as a larger original.
Only in Safari, which can open HEIC. In other browsers, export the photo as a JPG first, or change the iPhone camera setting to Most Compatible.
Images up to 40MB, and custom sizes up to 4096 pixels a side. There is no daily limit, because it runs on your device rather than our servers.
THE REST OF POSTALLY
Resizing is one step of many
Postally makes the post with AI, gets it approved, and schedules it to every channel.
Early access is by waitlist. Joining does not start a subscription, and this tool stays free either way.
See what else it does