Poster & Cover Size Guide — exact pixels per platform
Stop searching "what size is an X cover?". Poster Cat collects the exact pixel sizes for WeChat, Xiaohongshu, Channels, Bilibili, Douyin, Instagram, print and more into one table — copy a size, or jump straight into the matching maker. Free, local, watermark-free.
Size finder
platform specs
Design ideas
3 ideasPXSocial sizes
Quick reference for social covers, stories, and feed posts.
PXPrint sizes
Reference for A4, A3, and common poster print outputs.
PXSafe zones
Guide to crop-safe title zones and thumbnail behavior.
Xiaohongshu
Video
General
Tip: bookmark this page (Ctrl / ⌘ + D) to grab any size next time — no sign-up, always free.
Need platform-source citations? See the official-source social image sizes dataset.
How to use poster & cover size guide
- 1Find your publishing platform in the table.
- 2See the exact pixels and ratio; click Copy to grab them.
- 3Need to design? Click Make to open the matching tool.
- 4Type, theme, export — all local and watermark-free.
Why use Poster Cat's Poster & Cover Size Guide?
- One place: major Chinese + international sizes together.
- Safe-zone notes: e.g. WeChat covers crop to 1:1 when shared.
- Make right away: the entry point sits next to the size.
Frequently asked questions
What size is a WeChat cover?
The WeChat article cover is 900×383 px (~2.35:1). When shared, a 1:1 thumbnail is cropped from the center, so keep key text centered.
What is the Xiaohongshu cover ratio?
Xiaohongshu covers are 3:4 vertical, commonly 1080×1440 px — the largest, most eye-catching ratio for big-title and series covers.
What size is an Instagram post and Story?
An Instagram feed post is 1080×1080 px (1:1, or 1080×1350 for 4:5 portrait); an Instagram Story is 1080×1920 px (9:16 full-screen).
What size is a YouTube thumbnail?
YouTube thumbnails are 16:9 — the same ratio as the video. YouTube Help currently recommends 3840×2160; the long-running 1280×720 baseline is still accepted and keeps big text readable at small sizes.
Do these sizes go stale?
Platforms tweak sizes occasionally; Poster Cat keeps this table updated with each platform's current recommended/safe size.
How big should a print poster be?
Print needs real pixels at 300dpi — e.g. A4 portrait is 2480×3508 px. The Print group lists common print sizes.
Updated · Poster Cat team
About the output
The table combines paper sizes and image presets. Social image presets are starting dimensions; platforms may crop or resize an upload.
For print, pixels ÷ pixels per inch gives the size in inches. A4 is 210 × 297 mm and A3 is 297 × 420 mm; check the paper and print scale separately from image dimensions.
Documentation