Every platform crops differently, and most of them crop silently. You upload a beautifully composed image, hit publish, and discover that the feed has trimmed your headline, clipped your logo, or sliced a face in half. The frustrating part is that none of this is random — every platform publishes the dimensions it prefers, and almost every crop disaster comes from ignoring them. This is the short reference we use ourselves, followed by the rules that matter more than the numbers.
The sizes worth memorising
You do not need to remember every dimension on the internet. You need the handful that cover 95% of what you will actually post. Bookmark this list and you are done:
- Instagram feed: 1080 × 1080 (1:1) or 1080 × 1350 (4:5) — 4:5 takes the most vertical space and consistently earns more attention in the feed.
- Instagram Stories & Reels: 1080 × 1920 (9:16).
- TikTok: 1080 × 1920 (9:16).
- YouTube thumbnail: 1280 × 720 (16:9).
- YouTube Shorts: 1080 × 1920 (9:16).
- X / Twitter in-stream: 1600 × 900 (16:9).
- LinkedIn post: 1200 × 1200 (1:1) or 1200 × 627 for link cards.
- Pinterest: 1000 × 1500 (2:3).
Notice the pattern: there are really only five ratios in play — 1:1, 4:5, 16:9, 9:16 and 2:3. If your source library is organised around those five shapes, every platform becomes a preset instead of a research project.
Aspect ratio beats pixel count
Platforms re-encode and rescale everything you upload, so the exact pixel dimensions matter far less than the ratio. Get the ratio right and your image survives the trip intact; get it wrong and the platform decides which part of your picture to throw away. A 1080 × 1350 upload and a 2160 × 2700 upload land in the feed looking identical — but a 1080 × 1080 square pushed into a 4:5 slot gets cropped whether you like it or not.
“If you only fix one thing, fix the ratio. Everything else is compression you cannot control anyway.”
There is one caveat: going too small hurts. Upload a 400px-wide image and the platform will stretch it to fill a 1080px slot, leaving it soft and blocky. As a rule of thumb, match or slightly exceed the platform's published width and let the ratio do the rest.
Design for the safe zone
Vertical formats hide content behind interface chrome. On Stories, Reels, Shorts and TikTok, the top strip carries the profile row and the bottom strip carries captions, buttons and the progress bar. Keep anything important — faces, text, logos, prices — inside the middle 80% of the frame.
Link cards and feed previews have their own traps. LinkedIn and X sometimes render a centre-cropped preview before the full image loads, so a subject sitting near the edge can vanish in the timeline even when the full image is fine. When in doubt, centre the subject and give it breathing room on all four sides.
A workflow that scales beyond one post
The mistake most people make is resizing the same export over and over for each platform. Every generation of re-saving compounds compression artefacts, and after two or three rounds, edges go fuzzy and text turns muddy. The fix is to treat your original as the single source of truth and branch every platform version directly from it.
Do it in one pass
Open Resizely, drop the original in once, then export each ratio from the same source file. Working from the original every time — rather than resizing a resize — is what keeps edges clean and text readable. Because everything happens in your browser, a full set of five platform exports takes under a minute.
- Always start from the highest-resolution original you have.
- Pick the platform preset instead of typing numbers.
- Drag the image inside the crop frame so the subject stays centred.
- Check the safe zone on vertical formats before exporting.
- Export WEBP for the web, JPG when a platform is fussy.
Common mistakes that get images cropped
The first is exporting a landscape photo for a vertical slot and hoping the platform centres it kindly — it will not; it will take the middle slice and discard the rest. The second is designing right to the edge, with text or logos touching the frame, leaving nothing for the safe zone to absorb. The third is reusing a thumbnail across formats: a YouTube thumbnail at 16:9 looks fine until it is pushed into a 1:1 feed slot, where it becomes a letterboxed strip. Each of these has the same cure — a dedicated export per ratio, composed for that frame.
It also helps to preview at actual size before publishing. A composition that feels balanced on a desktop monitor can read very differently on a phone, where the feed image occupies most of the screen width and any crop is immediately obvious.
Sizes change slowly but they do change. When a platform updates its spec, the ratio logic in this article still holds — learn the five shapes, respect the safe zones, and always branch from the original. Do that and the silent crop stops being a surprise.
