Free tool · rules checked 9 November 2026
Image size checker: will Instagram, LinkedIn or YouTube crop your image?
Drop a photo and see, network by network, whether it fits, gets cropped, gets scaled or is too large. Your image never leaves your device: it is read in your browser.
Quick answer 3:4 vs 4:5 on Instagram: the Instagram app takes 3:4 (1080 × 1440), but apps that post for you take 4:5 (1080 × 1350) at most. So a 3:4 photo scheduled through an app is cropped to 4:5. A YouTube thumbnail should be 16:9, at least 640 pixels wide.
Drag a photo here, or
| Network | Result |
|---|
Image size rules on each network (2026)
| Network | Shape | Width | File size | Best size | Worth knowing |
|---|---|---|---|---|---|
| Instagram feed (in the Instagram app) | 3:4 to 1.91:1 | 320 to 1080 px | Not published (Any photo) | 1080 × 1440 (3:4) or 1080 × 1350 (4:5) | Wider than 1080 px is scaled down to 1080. |
| Instagram feed (posted through other apps) | 4:5 to 1.91:1 | 320 to 1440 px | 8 MB (JPEG) | 1080 × 1350 (4:5) | This is the rule for scheduling apps, PersonaXpand included. 3:4 works only in the Instagram app. |
| Instagram Story | 9:16 | Not published | 8 MB (JPEG (through apps)) | 1080 × 1920 (9:16) | Other shapes are shown with bars or zoomed in. |
| Facebook post | No rule published | Not published | 10 MB (JPEG, PNG, GIF, BMP or TIFF) | Any shape | Meta recommends keeping PNG files under 1 MB. |
| X (Twitter) post | No rule published | Not published | 5 MB (GIF 15 MB) (JPEG, PNG, GIF or WebP) | Any shape | X's developer docs set the file size; they state no shape rule. |
| LinkedIn post | No rule published | Not published | Under 36,152,320 pixels (JPG, PNG or GIF) | Any shape | LinkedIn limits the pixel count rather than the file size. |
| YouTube thumbnail | 16:9 | 640 to 3840 px | 2 MB (50 MB on a computer) (JPG or PNG) | 1280 × 720 up to 3840 × 2160 (16:9) | YouTube allows 50 MB when you upload on a computer and 2 MB on a phone. |
| Threads post | Up to 10:1 | 320 to 1440 px | 8 MB (JPEG or PNG) | 1080 × 1350 (4:5) | Wider than 1440 px is scaled down. |
| TikTok photo post | No rule published | Not published | 20 MB (JPEG or WebP) | 1080 × 1920 (9:16) | TikTok's photo posts take images up to 1080p. |
| Bluesky post | No rule published | Not published | 2 MB (Any image) | Any shape | Up to 4 images per post. |
Each rule is from the network's own help or developer page (linked on its name), read on 9 November 2026. “No rule published” means the network states no shape rule, so the checker only checks the file size there. Full list of sizes: social media image sizes.
What the checker tells you
- Fits: the network takes the image as it is.
- Will be cropped: the shape is outside the network's range. The crop box on your image shows what stays.
- Will be scaled: the image is wider than the network keeps, so it is made smaller. Nothing is cut.
- Too large: the file is over the network's limit. Save it as a JPEG or at a lower quality.
- The app vs other apps: Instagram has two rules, one for its own app and one for scheduling apps. Both are shown, because that difference is why a 3:4 photo gets cropped. More on it in Instagram post size: 3:4 vs 4:5.
Image size checker FAQs
Will Instagram crop my photo?
Only if its shape is outside Instagram's range. In the Instagram app a feed photo can be anything from 3:4 (tall) to 1.91:1 (wide). Apps that post for you, PersonaXpand included, are held to 4:5 to 1.91:1, so a 3:4 photo is cropped to 4:5 there. Drop your photo above to see the crop.
3:4 or 4:5 on Instagram?
3:4 (1080 × 1440) is taller and works when you post in the Instagram app. 4:5 (1080 × 1350) works everywhere, including scheduling apps. If you schedule your posts, use 4:5.
What is the best image size for Instagram?
1080 × 1350 pixels (4:5) for a feed post and 1080 × 1920 (9:16) for a Story. Photos wider than 1080 pixels are scaled down to 1080 in the app.
What size should a YouTube thumbnail be?
16:9, at least 640 pixels wide, and up to 3840 × 2160. YouTube allows files up to 2 MB from a phone and 50 MB from a computer.
Is my image uploaded anywhere?
No. Your browser reads the image on your own device to measure it. Nothing is sent to us or anyone else.
Why does it say "No rule published" for some networks?
Facebook, X, LinkedIn, TikTok and Bluesky publish file limits but no shape rule for posts, so the checker only checks the size and doesn't guess how their feeds frame your image.
Why can't it read my iPhone photo?
Some browsers can't open HEIC photos, the default on iPhones. Export it as JPEG (or set the camera to Most Compatible) and drop it again.
Want the rest done for you? PersonaXpand is easy to use
PersonaXpand is a beginner-friendly social media app with a simple interface. No experience with social media tools is needed.
- Beginner-friendly setup: answer three short questions and PersonaXpand writes your first post for you, ready to edit.
- Simple interface: posting, scheduling, replies and analytics in one app, not separate tools to learn.
- Replies handled for you: comments, DMs and mentions answered in your own voice, with your approval first if you want it.
- Works in English and Arabic.
Add the photo once
Add the photo once; the composer crops a version for each network and shows you the crop first.
Try it with your next photo