Social media aspect ratio guide — Instagram / TikTok / YouTube / X / LinkedIn / Xiaohongshu / Bilibili exact pixel dimensions and ratios.
- Runs locally
- Category Generator
- Best for Starting from a blank page without committing to the first result.
50+ official sizes for Xiaohongshu, Bilibili, Douyin, TikTok, Instagram, YouTube, X, LinkedIn, Weibo, WeChat Channels, Pinterest. Public spec sheets — not LLM guesses. Click any row to copy the WxH.
| Platform | Position | Size (px) | Ratio | Max size | Max duration | Notes |
|---|---|---|---|---|---|---|
| 📕Xiaohongshu | Note Cover (Portrait) | 3:4 | 32 MB | — | Default feed cover — best CTR on Discover | |
| 📕Xiaohongshu | Note Cover (Square) | 1:1 | 32 MB | — | Legacy square cover, still supported | |
| 📕Xiaohongshu | Note Cover (Vertical 3:4) | 3:4 | 32 MB | — | Highest engagement ratio for image notes | |
| 📕Xiaohongshu | Vertical Video | 9:16 | 500 MB | 10min | Official recommended vertical video format | |
| 📕Xiaohongshu | Horizontal Video | 16:9 | 500 MB | 10min | Horizontal video — gets letterboxed in feed | |
| 📕Xiaohongshu | Avatar | 1:1 | 2 MB | — | Min 200×200, rendered as circle | |
| 📺Bilibili | Video Cover (Horizontal) | 165:103 | 5 MB | — | Official horizontal cover (16:10) | |
| 📺Bilibili | Video Cover (Vertical) | 3:4 | 5 MB | — | Story Mode vertical cover | |
| 📺Bilibili | Horizontal Video | 16:9 | 16384 MB | — | Main horizontal video format | |
| 📺Bilibili | Vertical Video (Story Mode) | 9:16 | 16384 MB | 1min | Story Mode short vertical video | |
| 📺Bilibili | 4K Horizontal Video | 16:9 | 16384 MB | — | Premium creators can upload 4K | |
| 📺Bilibili | Dynamic Image | 1:1 | 20 MB | — | Up to 9 images per dynamic post | |
| 📺Bilibili | Avatar | 1:1 | 2 MB | — | Min 200×200; 480 recommended | |
| 📺Bilibili | Profile Banner | 5:1 | 2 MB | — | Channel banner, 5:1 | |
| 🎵Douyin | Vertical Video | 9:16 | 4096 MB | 10min | Official recommended full-screen format | |
| 🎵Douyin | Horizontal Video | 16:9 | 4096 MB | 10min | Horizontal — letterboxed in feed | |
| 🎵Douyin | Square Video | 1:1 | 4096 MB | 10min | 1:1 cross-platform compatible | |
| 🎵Douyin | Avatar | 1:1 | 2 MB | — | Min 200×200 | |
| 🎵Douyin | Cover Thumbnail | 9:16 | 5 MB | — | Same 9:16 as the video | |
| 🎶TikTok | Vertical Video | 9:16 | 287 MB | 10min | 默认全屏竖屏视频 | |
| 🎶TikTok | Horizontal Video | 16:9 | 287 MB | 10min | 信息流中会有黑边 | |
| 🎶TikTok | Profile Photo | 1:1 | 5 MB | — | 最小 20×20,推荐 200 | |
| 🎶TikTok | In-Feed Ad | 9:16 | 500 MB | 1min | 信息流广告 9:16 | |
| Vertical Video | 9:16 | 1024 MB | 30min | Default vertical, up to 30 min | ||
| Horizontal Video | 16:9 | 1024 MB | 30min | Horizontal 16:9 | ||
| Feed Image (Square) | 1:1 | 20 MB | — | Default square, up to 9 images | ||
| Feed Image (Landscape) | 3:2 | 20 MB | — | 3:2 landscape | ||
| Avatar | 1:1 | 2 MB | — | Min 50×50 | ||
| Header Cover | 16:5 | 5 MB | — | Profile banner | ||
| Feed Post (Square) | 1:1 | 30 MB | — | 默认正方形帖子 | ||
| Feed Post (Portrait) | 4:5 | 30 MB | — | 信息流允许的最高图 (4:5) | ||
| Feed Post (Landscape) | 540:283 | 30 MB | — | 1.91:1 横图帖子 | ||
| Reel | 9:16 | 4096 MB | 1min30s | 9:16 短视频 | ||
| Story | 9:16 | 4096 MB | 1min | 24 小时阅后即焚 9:16 | ||
| IGTV / Long Video | 9:16 | 4096 MB | 1h | 最长 60 分钟竖屏 | ||
| Profile Photo | 1:1 | 5 MB | — | 渲染为 110×110 圆形 | ||
| Story Highlight Cover | 9:16 | 5 MB | — | 主页上裁为圆形 | ||
| ▶️YouTube | Horizontal Video (1080p) | 16:9 | 256000 MB | — | 标准 HD 横屏视频 | |
| ▶️YouTube | Horizontal Video (4K) | 16:9 | 256000 MB | — | 4K UHD horizontal video | |
| ▶️YouTube | Shorts | 9:16 | 256000 MB | 1min | 9:16 短视频,最长 60 秒 | |
| ▶️YouTube | Thumbnail | 16:9 | 2 MB | — | 自定义缩略图 16:9 | |
| ▶️YouTube | Channel Banner | 16:9 | 6 MB | — | 安全区: 1546×423 (TV/桌面/移动) | |
| ▶️YouTube | Channel Avatar | 1:1 | 4 MB | — | 渲染为圆形 | |
| 𝕏X (Twitter) | In-Stream Photo | 16:9 | 5 MB | — | 16:9 信息流默认图 | |
| 𝕏X (Twitter) | Summary Card Image | 300:157 | 5 MB | — | 1.91:1 链接预览卡 | |
| 𝕏X (Twitter) | Profile Photo | 1:1 | 2 MB | — | 渲染为 200×200 圆形 | |
| 𝕏X (Twitter) | Header Image | 3:1 | 5 MB | — | 3:1 个人主页顶图 | |
| 𝕏X (Twitter) | Video (Horizontal) | 16:9 | 512 MB | 2min20s | 最长 140 秒,512 MB | |
| Shared Image | 400:209 | 5 MB | — | 1.91:1 链接预览图 | ||
| Square Image | 1:1 | 5 MB | — | 1:1 高互动信息流图 | ||
| Profile Photo | 1:1 | 8 MB | — | 最小 400×400,最大 8 MB | ||
| Profile Banner | 4:1 | 8 MB | — | 4:1 个人页头图 | ||
| Company Banner | 1128:191 | 8 MB | — | 公司页封面 | ||
| Video | 16:9 | 5120 MB | 10min | 最长 10 分钟,5 GB | ||
| 💬WeChat Channels | Vertical Video | 9:16 | 1024 MB | 1h | Official recommended vertical full-screen | |
| 💬WeChat Channels | Horizontal Video | 16:9 | 1024 MB | 1h | Horizontal — centered with letterbox | |
| 💬WeChat Channels | Cover Thumbnail (Vertical) | 3:4 | 5 MB | — | 3:4 vertical cover, recommended | |
| 💬WeChat Channels | Avatar | 1:1 | 2 MB | — | Min 200×200 | |
| Standard Pin | 2:3 | 20 MB | — | 2:3 官方最优比例 | ||
| Square Pin | 1:1 | 20 MB | — | 1:1 也支持 | ||
| Idea Pin / Video Pin | 9:16 | 100 MB | 1min | 9:16 多页 idea pin | ||
| Profile Photo | 1:1 | 10 MB | — | 最小 165×165 |
Sources: Xiaohongshu Creator Center · Bilibili Submission Help · Douyin Creator Service · Weibo Help · WeChat Channels Spec · Meta Business Help · YouTube Specifications · X Help Center · LinkedIn Help · TikTok Business Help · Pinterest Business Help (2025–2026).
What this tool does
A live reference table of 60+ official social-media sizes, copied straight from the platform spec sheets — Instagram, TikTok, YouTube, X, LinkedIn, Pinterest, Xiaohongshu, Bilibili, Douyin, Weibo, and WeChat Channels. Every row gives you platform, position (Reel, Story, Cover, Avatar, Thumbnail, Banner), exact pixel dimensions, GCD-simplified aspect ratio, maximum file size, and maximum duration for video positions. Search by name (e.g. "reel"), ratio (e.g. "9:16"), or pixel size (e.g. "1280"); filter by platform with a one-click pill. Click any pixel size to copy it. The inline aspect-ratio calculator turns a single dimension plus a ratio into the missing side, so you can resize a hero image for a Story without leaving the page. 100% client-side. Updated against 2025–2026 spec changes (Instagram 4:5 hard ceiling, YouTube Shorts 60s cap, Xiaohongshu 3:4 vertical default, Bilibili Story Mode, WeChat Channels 60-min vertical).
Tool details
- Input
- Text + Numbers
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Copy + Preview
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- No account required
- Open the page and use it; whether results survive refresh depends on the tool.
- Performance budget
- Initial JS <= 22 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- Generator · Content Creator
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
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1. Input
Paste or drop your content into the tool panel.
-
2. Process
Click the button. All processing is local in your browser.
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3. Copy / Download
Copy the result or download to disk in one click.
How Social Media Aspect Ratio Guide fits into your work
Use it to get a strong first draft, starter asset, or structured output that you can edit before publishing.
Generation jobs
- Starting from a blank page without committing to the first result.
- Creating repeatable drafts, names, templates, or placeholder assets.
- Exploring options before choosing the one that fits the job.
Generation checks
- Review generated output before it reaches a customer, page, or document.
- Change defaults when you need a specific brand voice, format, or audience.
- Keep only the parts that match the real task.
Good next steps
These links move the current task into a more complete workflow.
- 1 Aspect Ratio Calculator Calculate aspect ratio — fix any 1 of [width, height, ratio], get the other two. Open
- 2 Favicon Generator Generate favicon set — text or upload, output 16x16 / 32x32 / 180x180 / 512x512 PNG. Open
- 3 Image Compressor (Local) Image compressor — squeeze JPG/PNG/WebP without server upload, with quality slider, batch mode, file size comparison. Open
Real-world use cases
Exporting one hero shot for four platforms before a product launch
You shot a single 4000×6000 product photo and need it live on Instagram feed, a Reel, a Xiaohongshu note, and an X post by 2pm. Pull 1080×1350 (4:5) for the feed, 1080×1920 (9:16) for the Reel, 1080×1440 (3:4) for Xiaohongshu, and 1600×900 (16:9) for X in one pass. Four crops, four ratios, zero rejected uploads.
A junior editor cutting a vertical video without a rejected upload
Your editor exports a 9:16 cut at 1080×1920 and assumes it works everywhere. The guide flags that TikTok caps at 287MB / 10 min, Reels at 4GB / 90s, and Shorts at 60s. So the 75-second cut ships fine to Reels but gets auto-trimmed on Shorts. Checking the duration column first saves a re-export and a 40-minute round trip.
Filling a missing dimension for a banner with the inline calculator
A client hands you a 1584px-wide LinkedIn banner asset and asks for the matching height. Type 1584 into the calculator, pick 4:1, and it returns 396px instantly. No mental math, no opening a spreadsheet. You resize the source art to 1584×396 and the banner sits flush with no letterboxing on the profile page.
Briefing a freelance designer with copy-paste exact pixel specs
Instead of writing "make it square-ish for the gram," you copy the exact rows: Instagram feed 1080×1350, Story 1080×1920, Xiaohongshu cover 1080×1440. Click each pixel value to copy it straight into the brief. The freelancer delivers files that drop in without a single "can you re-export at the right size" email.
Common pitfalls
Treating 9:16 as one number. TikTok and Reels both use 1080×1920 but cap at 287MB/10min versus 4GB/90s, so a 5-minute cut passes TikTok and fails Reels.
Reusing a 1200×628 summary card as an in-stream X photo. It gets cropped top-and-bottom; attach a native 1600×900 (16:9) instead.
Uploading a 1:1 square cover to Xiaohongshu. The Discover feed crops it to a 3:4 window, so shoot 1080×1440 native or lose the top and bottom.
Privacy
This guide is a static reference table plus a JavaScript aspect-ratio calculator. There is no upload box, no canvas, and no image processing, so your actual files never leave your device. The calculator runs entirely in your browser. Your search terms, platform filters, and calculator inputs stay local and are never sent to a server or written into the URL, so nothing you type is logged or shared.
FAQ
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