This table answers a question that comes up every week: how big should a cover, avatar or video actually be for each platform? It covers 75 sizes across 13 platforms — WeChat Official Accounts and Channels, Xiaohongshu (RedNote), Douyin, Bilibili, Weibo and Zhihu in China; X, Instagram, YouTube, TikTok, LinkedIn and Facebook internationally; plus cross-platform staples such as og:image, favicon, email headers and desktop and phone wallpapers. Each entry gives the recommended pixel size, aspect ratio, placement and format limits.

What goes wrong more often than the size itself is which part gets covered: the like column on the right of Douyin, the progress bar at the top of Instagram Stories, a YouTube channel banner reduced to a single strip on phones, a WeChat Official Account cover cropped square when shared to Moments, the corners cut off a round avatar. Every entry draws these safe areas into the ratio preview (the shaded part is what gets obscured or cropped) and explains the reason in one line.

Every entry also has two actions: “Crop to this size on toolun” jumps to the matching crop / resize tool on this site (and tells you which preset to choose), and “Safe-area template” downloads an SVG of exactly that size with the safe frame drawn in, ready to drop into Figma / PS / Canva as a base layer.

1. 01Search or filter— enter a platform name, a use or a ratio in the search box (“Xiaohongshu cover”, “avatar”, “9:16”, “1080×1920”); two rows of chips filter by platform (China / international) and by use (cover / avatar / header / post image / video / card / stickers).
2. 02Read the preview— the box on the left of a card is scaled to the real ratio; the shading is the unsafe area and the dashed line the safe area; the “Safe area” row below explains who covers what.
3. 03Copy the size— click the blue 1080×1920 or the copy icon.
4. 04Go and crop— “Crop to this size on toolun” jumps to Social Size Export (which has the preset), Image Crop (free ratio) or Resize (exact pixels).
5. 05Download a template— “Safe-area template” gives you a SVG at exactly the target size with the safe area already drawn, ready to place into a design tool as a reference layer.
6. 06Favorite— star the entries you use often to pin them to the top of the page (stored locally).

Searching “Xiaohongshu cover”:

Xiaohongshu › Cover · image post 3:4 (recommended)   1242×1660   3:4
  The first image determines the ratio shown in the discovery feed; 3:4 has the largest footprint in the two-column feed; ≤ 20 MB
  Safe area: the title sits directly below the thumbnail in the discovery feed, so keep the last line of text off the bottom edge
  Crop to this size on toolun · Social Size Export "Xiaohongshu 3:4"   |  Safe-area template

Searching “9:16” lists Douyin, TikTok, WeChat Channels, Xiaohongshu video, Instagram Stories/Reels, YouTube Shorts and Bilibili portrait at the same time — the frame is identical but the safe areas are not: Douyin / TikTok leave 14% on the right and 22% at the bottom; Instagram leaves about 250px top and bottom; YouTube Shorts has a shorter title area at the bottom. When one portrait video goes to several platforms, the safest result comes from keeping subtitles and key information within the middle 60% of the height and the left 85% of the width.

Why the same 9:16 differs on every platform

Portrait short videos are all 1080×1920, and the difference is the UI each platform overlays on the picture: account name, caption and music bar at the bottom, like / comment / share on the right, progress bar and close button at the top. The height of these controls is set by each platform's design specification and changes between versions, so the safe-area percentages here are a conservative estimate — the largest obstruction seen in recent official creator guides and real screenshots. The principle is simple: leave 15–20% at the top and bottom, 12–15% on the right, and keep text away from the edges.

Round avatars and the 15% rule

Almost every platform takes a square avatar upload and displays it as a circle. The difference between the inscribed circle and the corners of the square is about 14.6% of the side (1 − √2⁄2 ≈ 0.293, split between the two sides), so every avatar in the table is marked with a 15% safe area on all four sides: keep the logo or the face inside that inscribed circle and the corners can be cut away without hurting recognition. Instagram displays it at only 110px and YouTube at 98px, so the less detail, the better.

Grid thumbnail crops: 3:4, 1:1 and 16:9 hurting one another

People see your content in two situations — opening the detail page for the full image, and scrolling a list or grid of thumbnails. Thumbnails are often forced into one uniform ratio: the profile grids of Douyin, TikTok and Instagram are 3:4 (Instagram changed from 1:1 to 3:4 in 2025), Weibo's nine-grid is 1:1, and the Bilibili cover becomes 16:9 instead of 16:10 in a few places. A 9:16 cover placed in a 3:4 grid loses about 16% at the top and bottom; a 1.91:1 landscape image placed in a 3:4 grid keeps only about 30% of its width in the middle. The “grid crop” safe areas mark these losses, so keep the subject of a cover in the center.

The 2.35:1 and 1:1 double life of a WeChat cover

A WeChat Official Account lead cover is displayed at 900×383 (2.35:1) at the top of the article and in subscription lists, but when shared into a chat or Moments only a 1:1 thumbnail is shown — the middle 383×383. Title text and faces therefore have to fall within the middle third, with only background at the sides. Secondary covers are 1:1 by definition and have no such problem. This is why designers say “a WeChat cover needs two versions”; follow the safe area here and one version is enough.

Why og:image is 1200×630

The Open Graph protocol itself specifies no size; 1200×630 (1.91:1) was Facebook's historical recommendation for share cards, and X's summary_large_image, LinkedIn, Slack and Discord all took it as the baseline, which made it the de facto standard for link previews. WeChat share cards, on the other hand, take a square thumbnail, so when you prepare an og:image for a page, put the logo or title inside the central 630×630 area and both kinds of platform will display it correctly. To verify a page's og tags and thumbnail, paste the URL into the URL tool or use the share debuggers of the platforms.

Pixels, multipliers and file size

The sizes in the table are recommended upload sizes, usually twice the display size, to suit high-density (Retina) screens: a column 677px wide takes a 1080px upload, a Moments cover displayed at about 640px takes 1280px. Uploading larger does not make it sharper — every platform re-compresses anyway — but it does run into file-size caps (10 MB per WeChat image, 2 MB for a YouTube thumbnail, 2 MB for an X avatar). After sizing, a pass through Image Compress usually halves the file size with no visible difference.

Data sources

— the creator help centers and open-platform documentation of each platform, checked on 2026-09-09; where a platform does not publish exact numbers (Moments covers, some profile backgrounds), the value is marked “recommended” with the reasoning given.

Safe areas are conservative estimates

— rounded from the largest obstruction seen in recent platform UIs; the real figures move with client versions and devices (notches, rounded screens), so keep important information in the middle of the safe area rather than on its edge.

What is not included

— e-commerce detail-page and product-image specs (Taobao, JD, Shopify), ad creative specs (feed ad sizes), the full icon size set for mini-programs and apps, and print sizes — each has its own specification system and mixing them together would mislead.

What it does not do

— this page does not process images. Cropping and resizing happen in the tools the links point to; “Crop to this size on toolun” currently still requires you to select the preset or enter the pixels in the target tool.

Template SVGs

draw only the frame and the safe area; they are not exact reproductions of platform UI elements.

The size data is loaded statically with the page, and searching, filtering, copying and favorites all happen locally in your browser without sending requests. The safe-area template SVGs are generated locally and downloaded directly, without passing through a server. After jumping to a crop tool on this site, images are likewise processed only in your browser and never uploaded.

• YouTube Help: channel banner image size（访问日期：2026-09-09）— the official explanation of 2560×1440 and the 1546×423 safe area.
• Instagram Help Center: photo and video sizes（访问日期：2026-09-09）— the ratios supported in Feed.
• X Help Center: How to customize your profile（访问日期：2026-09-09）— 400×400 avatar, 1500×500 header.
• WeChat Sticker Platform production specifications（访问日期：2026-09-09）— the four sizes for stickers, covers, banners and icons.
• The Open Graph protocol（访问日期：2026-09-09）— definitions of og:image and other tags.
• Meta Business Help Center: Image specs（访问日期：2026-09-09）— creative sizes for Facebook / Instagram ads and posts.