# Image resizer https://flaghand.com/image-resizer makes one photo (JPG, PNG or WebP) at every network's size at once, each drawn as it will download: cropped to fill around a point the person drags (one point for every size), or the whole photo fitted on a blurred copy of itself, white or black. Each size downloads as a JPG or PNG; a size that enlarges the photo says by how much. The sizes, checked on November 3, 2026: - Portrait post: 1080 × 1350 (4:5). Instagram, X and LinkedIn. - Square post: 1080 × 1080 (1:1). - Story, Reel or TikTok: 1080 × 1920 (9:16). Instagram Stories and Reels, TikTok, YouTube Shorts. - Landscape post: 1920 × 1080 (16:9). X and LinkedIn. - YouTube thumbnail: 1280 × 720 (16:9). - Link image: 1200 × 630, the card a shared link shows on X, LinkedIn and Facebook. - Pinterest Pin: 1000 × 1500 (2:3). - X header: 1500 × 500 (3:1). LinkedIn banner: 1584 × 396 (4:1). YouTube banner: 2560 × 1440. - Profile photo: 400 × 400, shown as a circle. - Any other size from 16 to 8,192 pixels a side. Free, no sign-up. It runs in your browser: nothing you type or add is uploaded or stored, and there is no API. ## How to use it 1. Drop, choose or paste a photo. A sample shows until you do. 2. Pick the sizes (the first four are on), or type a width and height and Add. 3. Pick Crop to fill and drag a crop into place, or Fit whole and a background. 4. Download each size. An agent can preset the choices in the link's hash, which never reaches a server (the photo itself can't travel in a link): https://flaghand.com/image-resizer#sizes=portrait,story,thumbnail&fit=fit&bg=white&format=png&custom=1200x1200 Fields: sizes (comma-separated: portrait, square, story, landscape, thumbnail, link, pin, x-header, li-banner, yt-banner, profile), fit=crop|fit, bg=blur|white|black, format=jpeg|png, custom=WxH (comma-separated). ## The sizes. ### Posts Portrait **1080 × 1350** 4:5. Instagram’s tallest feed post; X and LinkedIn show it whole. Square **1080 × 1080** 1:1. Shown whole in every feed. Landscape **1920 × 1080** 16:9. X and LinkedIn show it whole, at a smaller height. ### Full screen and video Story, Reel, TikTok **1080 × 1920** 9:16. Keep words out of the top and bottom, where the app draws its buttons. YouTube thumbnail **1280 × 720** 16:9, at least 640 wide, under 2 MB. Pinterest Pin **1000 × 1500** 2:3. ### Profiles and links X header **1500 × 500** 3:1. LinkedIn banner **1584 × 396** 4:1. YouTube banner **2560 × 1440** Text and logos inside the middle 1235 × 338. Link image **1200 × 630** The card a shared link shows. Profile photo **400 × 400** Shown as a circle: keep the corners empty. Checked on November 3, 2026, from [Instagram’s help](https://help.instagram.com/1631821640426723), [YouTube’s thumbnail](https://support.google.com/youtube/answer/72431) and [banner](https://support.google.com/youtube/answer/2972003) help, [Pinterest’s product specs](https://help.pinterest.com/en/business/article/pinterest-product-specs) and [Meta’s link image guide](https://developers.facebook.com/docs/sharing/webmasters/images). X and LinkedIn: the [social media image sizes guide](https://flaghand.com/docs/guides/social-media-image-sizes). ## Questions. ### How do I resize an image? Drop the photo on the page, or choose it. It is made at once as a portrait post, a square post, a story and a landscape post. Pick more sizes or type your own, drag each crop into place, then download the ones you want. ### Is my photo uploaded? No. The photo is resized in your browser. Nothing is sent anywhere or stored, and the page sets no cookies. ### What size should an Instagram post be? 1080 × 1350 (4:5) for a portrait post, which takes the most room in the feed, or 1080 × 1080 for a square one. Stories and Reels are 1080 × 1920 (9:16). ### What is the difference between crop and fit? Crop fills the whole size and cuts off what doesn’t fit; drag the photo to choose what stays. Fit keeps the whole photo and fills the rest with a blurred copy of it, white or black. ### Will resizing make my photo blurry? Not when the size is smaller than the photo. When a size needs the photo enlarged, the page says by how much, since an enlarged photo can look soft. ### What size is a YouTube thumbnail? 1280 × 720 (16:9), at least 640 pixels wide. A YouTube banner is 2560 × 1440, with its text and logos inside the middle 1235 × 338. To see a photo the way X and LinkedIn cut it in the feed, use the [image size checker](https://flaghand.com/image-size-checker). Every network’s photo sizes are in the [social media image sizes guide](https://flaghand.com/docs/guides/social-media-image-sizes). ## Flaghand A downloaded size goes into a Flaghand draft like any image (`flaghand media upload FILE`), and Flaghand checks it against its network before its owner approves the post. Flaghand is X and LinkedIn posting for AI agents: your agent drafts through Flaghand's API, CLI or MCP server, you approve the exact preview with your passkey, and Flaghand posts exactly that. Sign up at https://app.flaghand.com/start. In a chat app, add the connector at https://app.flaghand.com/mcp: its sign-in page creates the account. An agent with a shell can start the sign-up for its person over HTTP (https://flaghand.com/llms.txt, Quickstart). For agents: https://flaghand.com/llms.txt (this site) and https://app.flaghand.com/llms.txt (the product's agent guide).