WeChat Specifications

Moments Photo

Dimensions	1080 × 1080 px recommended
Max File Size	5 MB per image
File Formats	JPG, PNG
Notes	Up to 9 photos per Moments post; square format displays best

Official Account Article Cover

Dimensions	900 × 383 px (2.35:1, main headline) or 200 × 200 px (secondary/multi-article list)
Max File Size	5 MB
File Formats	JPG, PNG, GIF
Notes	Main headline image uses a 2.35:1 ratio (updated from the older 900×500 / 16:9 layout); secondary articles in a push: 200×200

Profile Photo

Dimensions	No fixed pixel requirement; 300 × 300 px recommended (square)
Max File Size	2 MB
File Formats	JPG, PNG, GIF, BMP
Notes	Displayed as a circle; WeChat auto-crops/compresses on upload

Official Account Avatar

Dimensions	300 × 300 px recommended
Max File Size	2 MB
File Formats	JPG, PNG, GIF, BMP
Notes	Square format; displayed at small sizes in feeds

Moments Video

Max File Size	100 MB
File Formats	MP4, MOV
Resolution	1080 × 1920 px (vertical) or 1920 × 1080 px (horizontal)
Max Duration	Up to 5 minutes
Notes	H.264 recommended; videos autoplay silently in feed; duration expanded from 30 seconds in March 2025

Video Channel (Shipinhao) Post

Max File Size	2 GB
File Formats	MP4, MOV
Resolution	1080 × 1920 px (vertical, 9:16 preferred); 1080p+ recommended
Max Duration	Up to 60 minutes on mobile (up to 8 hours via the desktop uploader)
Notes	WeChat's short-video platform; H.264 recommended. Limits were raised in stages (30 min, then 1 hour / 2 GB) since launch — mobile app enforces the 60-minute/2GB cap most users see

Official Account Article Video

Max File Size	20 MB for direct upload to the article media library
File Formats	MP4
Max Duration	Up to 30 minutes
Notes	Embedded inline in WeChat official account articles; videos over 20 MB must be hosted on Tencent Video and embedded by link instead of direct upload

Moments Text Post

Character Limit	1,500 characters

Official Account Article

Character Limit	No official hard limit characters per article (recommended 3,000–6,000 for readability)
Notes	Rich HTML article; supports images, video, audio embeds. WeChat does not publish a strict character cap for image-text articles — length is practically unlimited, though very long articles are discouraged for reader engagement

Nickname

Character Limit	20 characters

Bio

Character Limit	30 Chinese characters (up to ~60 for Latin characters)
Notes	Refers to WeChat's personal signature (个性签名) field

Chat Message

Character Limit	~5,000 characters (not officially published; user reports vary from ~650 to 5,000+ depending on client/context)
Notes	WeChat does not publish an official single-message character limit for 1:1/group chat; treat this figure as an estimate

Profile Photo

Dimensions	No fixed pixel requirement; 300 × 300 px recommended (square)
Max File Size	2 MB
File Formats	JPG, PNG, GIF, BMP
Notes	Displayed as a circle; WeChat auto-crops/compresses on upload

Official Account Cover

Dimensions	900 × 383 px (2.35:1)
Max File Size	5 MB
File Formats	JPG, PNG, GIF
Notes	Shown on the Official Account profile page; updated from the older 900×500 / 16:9 ratio

Moments Ad (Image)

Dimensions	800 × 800 px (1:1, standard); other ratios (640×800, 800×640, 1280×720) supported for select card/carousel formats
Max File Size	≤ 1 MB recommended (oversized files are auto-compressed; some formats allow up to ~1.7 MB)
File Formats	JPG, PNG
Notes	Appears in Moments feed; multi-image carousel supports 3/6/9 images. Sources disagree on the exact file-size ceiling (300 KB–1.7 MB) depending on ad format — confirm current limits in Tencent Ads Manager before a campaign

Moments Ad (Video)

Max File Size	100 MB (horizontal); vertical formats may cap lower (~30 MB)
File Formats	MP4
Resolution	1280 × 720 px or 1280 × 960 px (horizontal); 720 × 1280 px (vertical)
Max Duration	6 – 15 seconds (some vertical/full-screen formats allow up to 30 seconds)
Notes	Autoplays silently in Moments; exact duration/size caps vary by ad format (standard, card, full-screen) — confirm in Tencent Ads Manager

Banner Ad

Dimensions	640 × 100 px
Max File Size	200 KB
File Formats	JPG, PNG
Notes	Displayed at bottom of Official Account articles. Unverified: no current official Tencent Ads or independent 2025–2026 source could be found confirming this exact spec — bottom-of-article ad slots are typically served through the 流量主 (Media Partner) program with system-determined sizing rather than fixed advertiser-uploaded creative. Confirm directly with Tencent Ads before relying on this figure

Ad Headline

Character Limit	30 characters
Notes	Moments ad brand name / title. Card-style ad titles are shorter (~10 characters); some regular ad formats allow up to 40 characters / 4 lines of body copy