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Platform specs

One clean master becomes one file per platform below. Pick targets with --platforms (python -m vstudio.export master.mp4 --platforms xiaohongshu:vertical,douyin,youtube-shorts), in a batch spec, or in the app’s export step. Print the live table on your machine with cd lib && python3 -m vstudio.platform; override any value per creator in persona.local.yaml under platforms.<name>.

English / global

Section titled “English / global”
Profile Platform Canvas Cover Length (sweet spot / max) Title max Loudness
youtube:horizontal YouTube (long-form) 1920×1080 (16:9) 1280×720 420–1200 s / max 12 h 100 -14 LUFS / -1.5 dBTP
youtube-shorts:vertical YouTube Shorts 1080×1920 (9:16) 1080×1920 20–60 s / max 3 min 100 -14 LUFS / -1.5 dBTP
tiktok:vertical TikTok 1080×1920 (9:16) 1080×1920 21–60 s / max 1 h 55 -14 LUFS / -1.5 dBTP
instagram:reels Instagram 1080×1920 (9:16) 1080×1920 15–90 s / max 20 min none -14 LUFS / -1.5 dBTP
instagram:feed Instagram 1080×1350 (4:5) 1080×1350 15–90 s / max 20 min none -14 LUFS / -1.5 dBTP
x:horizontal X (Twitter) 1920×1080 (16:9) 1920×1080 15–90 s / max 2 min 20 s none -14 LUFS / -1.5 dBTP
x:square X (Twitter) 1080×1080 (1:1) 1080×1080 15–90 s / max 2 min 20 s none -14 LUFS / -1.5 dBTP
x:vertical X (Twitter) 1080×1920 (9:16) 1080×1920 15–90 s / max 2 min 20 s none -14 LUFS / -1.5 dBTP
facebook:reels Facebook 1080×1920 (9:16) 1080×1920 15–90 s / max 4 h none -14 LUFS / -1.5 dBTP
facebook:feed Facebook 1080×1350 (4:5) 1080×1350 15–90 s / max 4 h none -14 LUFS / -1.5 dBTP
facebook:horizontal Facebook 1920×1080 (16:9) 1920×1080 15–90 s / max 4 h none -14 LUFS / -1.5 dBTP
linkedin:horizontal LinkedIn 1920×1080 (16:9) 1920×1080 30–120 s / max 15 min none -14 LUFS / -1.5 dBTP
linkedin:square LinkedIn 1080×1080 (1:1) 1080×1080 30–120 s / max 15 min none -14 LUFS / -1.5 dBTP
linkedin:feed LinkedIn 1080×1350 (4:5) 1080×1350 30–120 s / max 15 min none -14 LUFS / -1.5 dBTP
threads:vertical Threads 1080×1920 (9:16) 1080×1920 15–90 s / max 5 min none -14 LUFS / -1.5 dBTP
threads:horizontal Threads 1920×1080 (16:9) 1920×1080 15–90 s / max 5 min none -14 LUFS / -1.5 dBTP
reddit:horizontal Reddit 1920×1080 (16:9) 1920×1080 15–120 s / max 15 min 300 -14 LUFS / -1.5 dBTP
reddit:square Reddit 1080×1080 (1:1) 1080×1080 15–120 s / max 15 min 300 -14 LUFS / -1.5 dBTP
reddit:vertical Reddit 1080×1920 (9:16) 1080×1920 15–120 s / max 15 min 300 -14 LUFS / -1.5 dBTP
pinterest:vertical Pinterest 1080×1920 (9:16) 1080×1920 6–60 s / max 15 min 100 -14 LUFS / -1.5 dBTP
pinterest:feed Pinterest 1000×1500 (2:3) 1000×1500 6–60 s / max 15 min 100 -14 LUFS / -1.5 dBTP
pinterest:square Pinterest 1080×1080 (1:1) 1080×1080 6–60 s / max 15 min 100 -14 LUFS / -1.5 dBTP
snapchat:vertical Snapchat Spotlight 1080×1920 (9:16) 1080×1920 10–60 s / max 1 min none -14 LUFS / -1.5 dBTP

Chinese

Section titled “Chinese”
Profile Platform Canvas Cover Length (sweet spot / max) Title max Loudness
xiaohongshu:vertical 小红书 RedNote 1080×1440 (3:4) 1080×1440 30–180 s / max 15 min 20 -14 LUFS / -1.5 dBTP
xiaohongshu:full 小红书 RedNote 1080×1920 (9:16) 1080×1440 30–180 s / max 15 min 20 -14 LUFS / -1.5 dBTP
xiaohongshu:horizontal 小红书 RedNote 1920×1080 (16:9) 1920×1080 30–180 s / max 15 min 20 -14 LUFS / -1.5 dBTP
douyin:vertical 抖音 Douyin 1080×1920 (9:16) 1080×1920 15–60 s / max 15 min 55 -14 LUFS / -1.5 dBTP
douyin:horizontal 抖音 Douyin 1920×1080 (16:9) 1920×1080 15–60 s / max 15 min 55 -14 LUFS / -1.5 dBTP
wechat-channels:vertical 视频号 WeChat Channels 1080×1920 (9:16) 1080×1440 15–120 s / max 8 h 16 -14 LUFS / -1.5 dBTP
wechat-channels:horizontal 视频号 WeChat Channels 1920×1080 (16:9) 1920×1080 15–120 s / max 8 h 16 -14 LUFS / -1.5 dBTP
bilibili:horizontal B站 Bilibili 1920×1080 (16:9) 1146×717 180–900 s / max 10 h 80 -14 LUFS / -1.5 dBTP
bilibili:vertical B站 Bilibili 1080×1920 (9:16) 1080×1440 180–900 s / max 10 h 80 -14 LUFS / -1.5 dBTP
kuaishou:vertical 快手 Kuaishou 1080×1920 (9:16) 1080×1920 15–90 s / max 15 min none -14 LUFS / -1.5 dBTP
kuaishou:horizontal 快手 Kuaishou 1920×1080 (16:9) 1920×1080 15–90 s / max 15 min none -14 LUFS / -1.5 dBTP
weibo:horizontal 微博 Weibo 1920×1080 (16:9) 1920×1080 30–300 s / max 15 min 30 -14 LUFS / -1.5 dBTP
weibo:vertical 微博 Weibo 1080×1920 (9:16) 1080×1920 30–300 s / max 15 min 30 -14 LUFS / -1.5 dBTP
zhihu:horizontal 知乎 Zhihu 1920×1080 (16:9) 1920×1080 60–600 s / max 1 h 30 -14 LUFS / -1.5 dBTP
zhihu:vertical 知乎 Zhihu 1080×1920 (9:16) 1080×1920 60–600 s / max 1 h 30 -14 LUFS / -1.5 dBTP

Other languages

Section titled “Other languages”
Profile Platform Canvas Cover Length (sweet spot / max) Title max Loudness
dailymotion:horizontal Dailymotion 1920×1080 (16:9) 1280×720 60–900 s / max 2 h 255 -14 LUFS / -1.5 dBTP
dailymotion:vertical Dailymotion 1080×1920 (9:16) 1080×1920 60–900 s / max 2 h 255 -14 LUFS / -1.5 dBTP
kwai:vertical Kwai 1080×1920 (9:16) 1080×1920 15–60 s / max 5 min none -14 LUFS / -1.5 dBTP

How each platform is published

Section titled “How each platform is published”

Publishing is assisted by default: the app opens the platform’s own upload page, fills in the file and the copy, and you press publish. An API uploader is only used when you configure one and confirm each post. See Assisted publishing.

Platform Upload page (assisted) Official API (opt-in only)
youtube https://www.youtube.com/upload YouTube Data API v3 videos.insert (OAuth; unaudited projects are locked to private)
youtube-shorts https://www.youtube.com/upload same as youtube (vertical, <= 3 min)
tiktok https://www.tiktok.com/tiktokstudio/upload Content Posting API (unaudited: SELF_ONLY, private account)
instagram https://www.instagram.com/ Content Publishing API (Professional account, reviewed Meta app, public video URL)
x https://x.com/compose/post X API v2 media upload + POST /2/tweets (paid credits, OAuth 2.0 user token)
facebook https://www.facebook.com/ Graph API Reels publishing - Pages only (pages_manage_posts), 30 API Reels / 24 h; no API for personal profiles
linkedin https://www.linkedin.com/feed/ Posts + Videos API: member posts via Share on LinkedIn (w_member_social); Pages need Community Management API approval
threads https://www.threads.com/ Threads API threads_content_publish (app review for other accounts; video at a public URL; 250 posts / 24 h)
reddit https://www.reddit.com/submit Data API (OAuth, app pre-approval); video upload is the undocumented media-asset flow - not used
pinterest https://www.pinterest.com/pin-creation-tool/ API v5 media + pins (Standard access tier; trial pins are private)
snapchat https://profile.snapchat.com/ Public Profile API (allowlisted partners only)
xiaohongshu https://creator.xiaohongshu.com/publish/publish —
douyin https://creator.douyin.com/creator-micro/content/upload open platform: server-side posting only for government / media tools; SDK share needs an enterprise app
wechat-channels https://channels.weixin.qq.com/platform/post/create —
bilibili https://member.bilibili.com/platform/upload/video/frame 开放平台 视频稿件投递 (developer application + review)
kuaishou https://cp.kuaishou.com/article/publish/video 快手开放平台 photo/publish (approved app, user_video_publish scope)
weibo https://weibo.com/upload/channel video upload API only for government / media / institution accounts
zhihu https://www.zhihu.com/zvideo/upload-video —
dailymotion https://www.dailymotion.com/partner/ Data API v2 upload sessions (OAuth video.manage, API key from Studio)
kwai no desktop web upload: post from the phone app —

Notes and sources

Section titled “Notes and sources”

lib/vstudio/platform.py holds the defaults. Override any field in persona.local.yaml under platforms.<name> (or platforms.<name>.orientations.<o>). python -m vstudio.platform prints every profile. python -m vstudio.export uses them to produce per-platform files (see the bottom of this page).

Researched October 2026 (X / Instagram / 视频号 added and B站 re-checked 2026-10-06; Facebook, LinkedIn, Threads, Reddit, Pinterest, Snapchat, 快手, 微博, 知乎, Dailymotion, Kwai added 2026-10-06 - see “Platforms added 2026-10” below). Publishing (how a post gets there, APIs): references/PUBLISHING.md. Platforms change their UI and limits often, and no platform here publishes safe-zone pixels or a loudness target (YouTube’s −14 LUFS is the one well-documented normalisation). Each value below is tagged: [S] sourced (official doc, or several independent guides that agree), [3P] one or two third-party guides, [C] convention (our own working default, measured in-app or chosen to be conservative). When a platform’s UI changes, preview on a phone and update the persona, not the code.

Order and groups

Section titled “Order and groups”

Every list a person sees (platform pickers, the desk’s publish page, accounts list, calendar chips, the website) uses platform.ORDER: English / global (YouTube, Shorts, TikTok, Instagram, X, Facebook, LinkedIn, Threads, Reddit, Pinterest, Snapchat), then Chinese (小红书, 抖音, 视频号, B站, 快手, 微博, 知乎), then other languages (Dailymotion, Kwai). platform.ordered(names, connected=[...]) puts platforms with a connected account first within their group. PLATFORMS (the dict) keeps its old insertion order so lookups that scan it are unchanged.

YouTube = one channel, two formats. youtube (long-form, 16:9) and youtube-shorts (vertical or square, ≤ 3 min [S: https://support.google.com/youtube/answer/15424877]) stay two export targets but share one account: channel_of("youtube-shorts") == "youtube", FORMATS["youtube"]. youtube_format(aspect, seconds) says which one a file is; check_format (also run by vstudio.export) warns when long-form only has a vertical master (re-laid out on 16:9 with a blurred fill - render a real 16:9 cut, or post it as Shorts) and when a Shorts target is horizontal or over 180 s. Shorts description links are not clickable since 2023-08 [S: https://support.google.com/youtube/answer/13748639 , https://9to5google.com/2023/08/10/youtube-shorts-links-spam/].

Canvases

Section titled “Canvases”
profile canvas notes
xiaohongshu:vertical 1080x1440 (3:4) feed-native vertical; cover 3:4 1080x1440 [S: multiple 3P guides agree]
xiaohongshu:full 1080x1920 (9:16) full-screen vertical; feed tile shows a 3:4 cover [S]
xiaohongshu:horizontal 1920x1080 (16:9) feed shows a centre 4:3 crop of horizontal posts and covers [3P + in-app; repo cover workflow]
douyin:vertical / :horizontal 1080x1920 / 1920x1080 9:16 recommended [S]; profile grid shows a 3:4 crop of covers [3P]
tiktok:vertical 1080x1920 [S]
youtube:horizontal 1920x1080 [S]
youtube-shorts:vertical 1080x1920 Shorts = square or vertical, up to 3 min (since 2024-10-15) [S]
bilibili:horizontal / :vertical 1920x1080 / 1080x1920 [S]
wechat-channels:vertical / :horizontal 1080x1920 / 1920x1080 视频号: aspect 0.33-3.0 accepted, 16:9 or 9:16 recommended, ≤ 2 GB, no HDR [S: 视频号 help centre]; the old 6:7 (1080x1260) size now only matters for share cards [3P]
x:horizontal / :square / :vertical 1920x1080 / 1080x1080 / 1080x1920 16:9 recommended, 1:1 and 9:16 supported, max 1920x1200 / 1200x1920 [3P, several agree]. A bare x target picks the orientation closest to the master (auto_orientation) - no letterbox
instagram:reels 1080x1920 (9:16) [S: all guides agree]; the feed shows a centre 4:5 crop (y 285-1635) [3P]
instagram:feed 1080x1350 (4:5) tallest feed post [3P, several agree]; videos posted to feed are Reels since 2023 [S: Meta API docs]

Safe zones (px on the profile canvas: top / bottom / left / right, + lower-right button column)

Section titled “Safe zones (px on the profile canvas: top / bottom / left / right, + lower-right button column)”
profile top bottom left right right_lower keep-out tag
xiaohongshu:full 240 260 (y 1660) 60 60 160 w from y 960 [C] measured by the talkinghead workflow (safe_zone persona key)
xiaohongshu:vertical 60 150 48 48 120 w from y 900 [C] the full-screen numbers mapped onto a 3:4 frame, then padded
xiaohongshu:horizontal 60 60 280 280 – [C] left/right = outside the 4:3 feed crop (240) + 40
douyin:vertical 160 440 60 150 180 w from y 900 [C] from the TikTok numbers (same UI family); 3P says “centre 1080x1350”
tiktok:vertical 130 484 60 140 – [3P] most-cited set: 130/484/44/140 (bottom grows with long captions)
youtube-shorts:vertical 180 390 60 120 – [3P] AdConvert set; others range 120-380 top, 300-390 bottom
youtube / bilibili horizontal 54 54-80 96 96 – [C] 5 % title-safe; bilibili bottom +danmaku/progress bar
bilibili:vertical 200 420 60 150 – [C]
wechat-channels:vertical 200 460 60 60 – [C] no published numbers; bottom = author / description / like row
wechat-channels:horizontal 54 80 96 96 – [C]
x:horizontal / square 54 90 96 / 60 96 / 60 – [C] player controls at the bottom; timeline video has almost no overlay
x:vertical 160 380 60 120 – [C] immersive player: post text + action row at the bottom
instagram:reels 285 450 60 130 170 w from y 1000 top = 4:5 feed crop (285) ≥ UI 200-220 [3P]; bottom 400-450 [3P: CampaignSwift 400, Somake 450, Xyla 430]; right rail [3P]
instagram:feed 60 120 60 60 – [C] mute / tag icons only

Captions

Section titled “Captions”

caption.band [y0, y1], size [min, max] px, max_chars_zh / max_chars_en per line, max_lines 2. All [C]: vertical 52-72 px, 14 CJK / 32 latin per line (the repo’s subtitles.max_cjk_chars 18 is for 16:9 / wide boxes); horizontal 44-60 px, 22 CJK / 48 latin. 小红书 9:16 band centred on y ≈ 1525 (talkinghead workflow). platform.fit_text_size() picks the largest size that wraps into max_lines inside caption_box().

Length (seconds: sweet spot / hard max)

Section titled “Length (seconds: sweet spot / hard max)”
profile sweet max tag
xiaohongshu 30-180 900 (15 min) max [3P, several agree; some accounts higher]; sweet [C]
douyin 15-60 900 max [C] (in-app 15 min common; longer for some accounts)
tiktok 21-60 600 10 min in-app / Content Posting API [S]; 60 min web upload for some accounts [3P]
youtube 420-1200 43200 (12 h) max [S]; sweet [C]
youtube-shorts 20-60 180 [S]
bilibili 180-900 36000 [C]
wechat-channels 15-120 28800 phone 3 s-60 min, computer (视频号助手) up to 8 h [S: 视频号 help centre via search, page ~2 y old]; sweet [C]
x 15-90 140 (standard) 140 s / 512 MB [3P, all agree]; Premium: sources disagree (2 h vs 4 h, 8 vs 16 GB; Android 10 min) → profile tiers premium 7200 s / 8 GB, premium_plus 14400 s / 16 GB [3P, unverified: help.x.com blocked automated reads]
instagram 15-90 1200 20 min Reels since 2025 [3P, several]; > 3 min is not recommended to non-followers (reach_max 180, warned) [3P citing the IG Help Center]; min 3 s; 4 GB [3P]

Loudness, fps, encode

Section titled “Loudness, fps, encode”
  • YouTube −14 LUFS is well established [S: many guides; YouTube turns louder uploads down]. TikTok/Douyin/小红书/B站 publish no target: −14 LUFS integrated, −1.5 dBTP everywhere [C] (repo default audio.loudness_lufs; guides agree on ≤ −1 dBTP because platform transcodes overshoot). B站 reportedly does not normalise [3P, Zhihu]. Override per platform in the persona (e.g. a hotter −12 LUFS short-form master).
  • fps: deliver at the source rate, 30 default; capped at 60 (120 on B站) [S YouTube: “same frame rate as recorded”].
  • Encode: H.264 High, yuv420p, BT.709, AAC 48 kHz, +faststart [S YouTube recommended upload settings]. YouTube 1080p30 SDR ≈ 8 Mbps (12 at 60 fps), “no bitrate limit” [S] → CRF 18 with a 16 M cap [C]. B站 1080p re-encodes above ~6 Mbps average / 24 Mbps peak [3P] → CRF 18, maxrate 24 M [C]. 小红书 8-12 Mbps advised [3P] → CRF 18, 16 M cap. TikTok/Douyin CRF 20, 12 M cap [C]. X: H.264 High, AAC-LC, 30/60 fps, ≤ ~25 Mbps [3P] → CRF 20, 12 M cap; Instagram / 视频号 CRF 20, 12 M cap [C].
  • Upload caps live in limits.max_bytes (X 512 MB standard, Instagram 4 GB, 视频号 2 GB); vstudio.export warns when a file is over the cap for the account tier.
  • X autoplays muted in the timeline: the profile says captions.burn: recommended, and an X export without --cues warns. Loudness for X / Instagram / 视频号: −14 LUFS / −1.5 dBTP [C; 3P guides cite −14 for Reels].

Covers

Section titled “Covers”
profile size title-safe / feed crop tag
xiaohongshu vertical/full 1080x1440 3:4 – [S]
xiaohongshu horizontal 1920x1080 feed shows centre 4:3 → .feed.jpg preview [3P + workflows/cover]
douyin / tiktok vertical 1080x1920 profile grid shows centre 3:4 [3P]
youtube 1280x720, ≤ 2 MB (desktop now allows larger) bottom-right timestamp: title-safe ends at x 1100 [S]
youtube-shorts 1080x1920 – [C]
bilibili horizontal 1146x717 (16:10), min 960x600, ≤ 5 MB also cropped to 4:3 (phone home feed) and 16:9 → crops: [4:3, 16:9], title-safe = the intersection size [3P, several agree]; crops [3P: B站 creator post, updated 2023-11; it says 4:3 1200x900 is now asked for - the uploader crops one image per ratio]
wechat-channels vertical 1080x1440 (3:4) share card 6:7 (1080x1260) → crops: [6:7] [3P]
x = the video canvas (thumbnail is a frame you pick) – [C]
instagram:reels 1080x1920 4:5 feed, 3:4 profile grid (since 2025), 1:1 (older grid / some surfaces) → title-safe = centre 1080x1080 (y 420-1500) 9:16 + 4:5 [3P, several]; grid 3:4 vs 1:1 vs 4:5 [3P disagree → check all three]
instagram:feed 1080x1350 3:4 grid, 1:1 [3P]

Crop check. For every crop in platform.cover_crops(p) the export writes <target>.cover.crop-4x5.jpg etc. and <target>.cover.crops.jpg (all crops + the title-safe box outlined), and export.cover_crop_check measures the share of busy 48 px tiles (text / faces / detail) in each strip a crop removes: over 15 % → a warning that the headline is probably cut in that view.

Title / description / tags / chapters

Section titled “Title / description / tags / chapters”
platform title description tags chapters
小红书 20 (CJK 1, latin 0.5; config.xhs_len) [S] 1000 [S] #话题 in body [C: ≤10] none native; 时间线 text, labels ≤ 14 [C]
抖音 55 [3P, practical app limit] 1000 incl. #话题/@ (open-platform API) [S] inline no
TikTok 55 [C, same as publish] 4000 (2200 via API) [S] inline, ≤ 30 [3P] no
YouTube / Shorts 100 [S] 5000 [S] first 3 shown above title, > 60 → all ignored [S] ≥ 3, first 00:00, each ≥ 10 s [S]
B站 80 [3P] 2000 (250 in some 分区) [3P] ≤ 10 tags, ≤ 20 chars each [3P] 分段章节 in the uploader [C]
视频号 短标题 16 [3P, unverified: the uploader shows the limit] 1000 incl. #话题 / @ [3P] inline #话题 [C ≤ 10] no
X none (the post text is everything) 280 weighted (standard) / 25,000 (Premium) [3P]: twitter-text v3 - Latin/punctuation 1, CJK and emoji 2, any URL 23 [S: twitter-text config/v3.json] 1-2 [C, common guidance] - publish keeps the first 2 no
Instagram none (first caption line = hook) 2,200 [S: Meta Content Publishing API docs] max 5 per post/reel since Dec 2025 (was 30) [S: Instagram @creators announcement, reported widely]; 3-5 recommended no

Fields: B站 needs a 分区 (category.required; tid through the open platform) and the creator’s own 自制 / 转载 choice - never pre-filled by the desk. platform.check_text counts X weighted (desc_count: x), and hashtags across the tag list AND the #tags already in the body.

Post language. vstudio.publish.platform_post (used by vstudio.export --post) picks the copy per platform: post.json may hold en / zh blocks; English content (detected from the cues, or --lang en) gets English copy on X / Instagram / TikTok / YouTube; --bilingual = English then Chinese. English copy never inherits the persona’s Chinese tags (publish.tag_sets.en is used if present). X copy is shortened by whole sentences to 280 weighted. publish.generate_copy(platform, source) asks the routed LLM (task copy) for copy within these limits.

title_max agrees with vstudio.publish.TITLE_MAX_DEFAULT, and both read the same persona key (platforms.<name>.title_max).

Multi-platform export

Section titled “Multi-platform export”
Terminal window
python3 -m vstudio.export work/master.mp4 --platforms xiaohongshu:vertical,douyin,youtube \
    --out exports/ --cues work/cues.json --cover work/cover-3x4.png --cover work/cover-16x9.png --post work/post.json
# international: x picks 16:9 / 1:1 / 9:16 from the master; Reels + a 4:5 feed cut; English copy + 2 / 5 tags
python3 -m vstudio.export work/master.mp4 --platforms x,instagram,instagram:feed --cues work/cues.json \
    --cover instagram=work/cover-9x16.png --post work/post.json [--lang en | --bilingual] [--account premium]

Keep the master caption-free and the cues separate (subs.Cue.to_dict JSON or SRT). Each export then gets captions placed and sized for that platform’s UI. Text burned into a 16:9 master gets cropped off on 3:4 / 9:16. Reframe: face mode follows the main face inside the safe box. If no face is found it uses a blurred fill (pad-blur). A master of the same aspect is a plain ffmpeg scale (no face tracking; manifest says scale).

  • Masters with burned overlays (记笔记 panels, stamps, hook titles): put keepouts in cues.json - {"cues": [...], "keepouts": [{"t0", "t1", "box": [x, y, w, h], "kind"}], "size": [W, H]}, boxes in master px (or 0..1 fractions), final seconds. Each box is mapped through the reframe and the caption moves above / below it while it is on screen (captions_moved_frames in the manifest; a warning if there is no free spot). --no-captions skips burning when the master already has its captions.
  • Keyword colour survives re-burning: 【kw】 markup in cue text, or per cue "hl": ["kw", ...] / [[i, j]] char spans, and "style": {"fill": "#fff", "highlight": "#FFD60A"}.
  • Covers: --cover xiaohongshu=cover_3x4.png --cover douyin=cover_9x16.png gives each target its own cover. A generic --cover of another aspect is fitted on a blurred pad (a centre crop cuts the headline) with a warning - render a real cover per aspect for anything you publish. Outputs: <platform>-<orientation>.mp4, .cover.jpg (+ .cover.feed.jpg), .crop.json, .post.md, and manifest.json (sizes, durations, measured loudness, reframe hit rate, pan stats, warnings).

Platforms added 2026-10

Section titled “Platforms added 2026-10”

Tags as above ([S] / [3P] / [C]). Meta, Pinterest, Reddit and Dailymotion help pages mostly refused automated reads, so several of their numbers are [3P]; no platform below publishes a loudness target → −14 LUFS / −1.5 dBTP [C].

platform (profiles) canvas safe zone (top/bottom/left/right) length size title text hashtags links
Facebook (facebook:reels default, :feed 4:5, :horizontal) 1080x1920 / 1080x1350 / 1920x1080 [3P] Reels 269/672/65/65 = Meta’s 14 % / 35 % / 6 % [3P citing Meta Business Help]; feed / 16:9 [C] Reels: no cap since 2025-06, 240 min upload cap [3P]; Reels API 3-90 s [S] → max 14400, sweet 15-90 [C] 4 GB [3P] none 2,200 [C: Reels caption limit unsourced; posts 63,206 3P] 3-5 [3P] feed clickable, Reels not reliably [C]
LinkedIn (linkedin:horizontal default, :square, :feed 4:5; auto-orientation) 16:9 / 1:1 / 4:5, any 1:2.4-2.4:1 [3P] [C] 3 s-15 min organic [3P] (API / ads 30 min [S]) 5 GB [3P] (API 500 MB-5 GB [S]) none for organic posts [3P] 3,000 [S] 1-3, keyword signal only [3P] clickable; reach penalty disputed [3P]
Threads (threads:vertical default, :horizontal) 9:16 rec., ratios 0.01-10, width ≤ 1920 [S] [C] = X vertical ≤ 5 min [S] 1 GB [S] none 500 [S] one topic tag [3P] (hard) clickable; ≤ 5 links via API [S]
Reddit (reddit:horizontal default, :square, :vertical) 16:9 / 1:1 work best in the feed [3P] [C] 15 min [3P] 1 GB [3P] 300, required, not editable [3P] 40,000 (self-post) [3P] none clickable (markdown)
Pinterest (pinterest:vertical default, :feed 2:3, :square) 9:16, 2:3, 1:1; ratio 1:2-1.91:1 [3P] 270 / 790 / 65 / 195 [3P, citing Pinterest] 4 s-15 min, 5 min organic per one 3P (sources disagree) 2 GB [3P] 100 [3P] 500 [3P] none: up to 10 topics picked on the page [S] separate destination-link field [S]
Snapchat Spotlight (snapchat:vertical) 9:16, ≥ 540x960 [S] [C] 5-60 s web [S] 1 GB [3P] none ~160 [3P] #Topics, 1-3 [C]; irrelevant ones raise rejection [3P] none
快手 (kuaishou:vertical default, :horizontal) 9:16 main, 16:9 / 1:1 [3P] [C], bottom ≈ 20 % UI 15 min / 4 GB web [S: help centre] (others 10-30 min [3P]) 4 GB [S] none (one 文字描述 = caption; API caption required) 500 [3P] #话题 (one #), 1-3 niche [3P] not clickable, 站外导流 penalised [3P]
微博 (weibo:horizontal default, :vertical; auto-orientation) 16:9 / 9:16 [3P] [C] 15 min ordinary accounts [3P] PC 15 GB [S: kefu FAQ] 投稿 title ≥ 6 chars [S]; max 30 [C] 2,000 [3P] #话题# (two hashes) [S: help.sina] ≤ 3 [C] 网页链接 short links; non-whitelisted domains get a risk prompt [S: m.weibo.cn/outlink_rules.html]
知乎 (zhihu:horizontal default, :vertical) 16:9 safest [C] [C] PC 1 h / 2 GB [3P] 2 GB [3P] 30, required [3P] 简介 300 [3P] no inline tags: 话题 field (≤ 5 [C]) not clickable (unverified), 导流 loses 优质 [3P]
Dailymotion (dailymotion:horizontal default, :vertical) 16:9 and 9:16 [S snippet] [C] 2 h / 4 GB standard accounts, 15 uploads / 24 h [S snippet] 4 GB 1-255, required [S: API docs] 3,000 [S snippet] ≤ 15 #hashtags in the description, 2-25 chars [S] clickable
Kwai (kwai:vertical) 9:16 native [C] = 抖音 no public spec; 57 s camera / ~5 min editor / 10-12 min gallery claims disagree → max 300 [C] – none 500 [C] ≤ 5 [C] not clickable [C]

Required choices the desk never makes for the creator: Reddit subreddit (typed by her), flair, NSFW / spoiler; Pinterest board + topics; 微博 投稿 频道 / 标签 / 原创; 知乎 领域 / 话题 / 原创; Dailymotion category / language / made-for-kids; every Chinese platform’s AI 生成内容声明 (《人工智能生成合成内容标识办法》, in force 2025-09-01 [S: https://www.news.cn/legal/20250901/a12108b0b10249e5bae4435269e40c91/c.html]).

Reddit norms. No sitewide 9:1 rule any more: Reddit says some communities use a 10 % self-promotion rule and some ban promotion outright [S: https://support.reddithelp.com/hc/en-us/articles/28012014962580]; spam is never allowed and posts should be in communities you take part in [S: https://support.reddithelp.com/hc/en-us/articles/360043504051-Spam]; don’t flood several communities at once [S: Reddiquette https://support.reddithelp.com/hc/en-us/articles/205926439-Reddiquette]; NSFW must be tagged [S: https://support.reddithelp.com/hc/en-us/articles/15484642147988]. Flair, account age and karma minimums are per subreddit: read the sidebar rules, disclose that it is your own video, upload the file itself (no channel link), and expect some communities to remove it.

Re-checked 2026-10-06: TikTok uploads up to 60 min (in-app recording 10 min; some accounts still 10 min) [S: https://support.tiktok.com/en/using-tiktok/creating-videos/camera-tools] → length.max 3600; 抖音 web 15 min / 4 GB (open-platform spec agrees) → limits.max_bytes. YouTube thumbnails: guides now cite up to 3840x2160 / 50 MB on desktop; 1280x720 ≤ 2 MB stays the safe default [3P]. Link handling is per profile (links, platform.link_policy): check_text warns when a URL is in the text where it is not clickable (Instagram, TikTok, Shorts, 小红书, 抖音 …) or belongs in a link field (Pinterest).

French- and Spanish-speaking markets: why only Dailymotion and Kwai

Section titled “French- and Spanish-speaking markets: why only Dailymotion and Kwai”

These markets run on the global platforms already in the list. France: YouTube 51.5 M, Facebook 31.5 M, Snapchat 29.8 M, Instagram 28.2 M, TikTok 23.4 M ad reach [S: https://datareportal.com/reports/digital-2026-france]; Snapchat is #1 with 11-14 year-olds (Médiamétrie 2025, via press). Quebec: Facebook 74 %, YouTube, Instagram, TikTok [S: https://transformation-numerique.ulaval.ca/enquetes-et-mesures/netendances/reseaux-sociaux-et-divertissement-en-ligne-2025/]. Francophone Africa: Facebook ≈ 80 %+ of social web visits, TikTok growing [S: https://gs.statcounter.com/social-media-stats/all/cameroon]. Spain: WhatsApp, Instagram 57.9 %, TikTok 31 % [S: https://www.cnmc.es/prensa/panel-hogares-ott-internet-20260522]. Mexico: TikTok 99 M, Facebook 93.5 M, YouTube 85 M [S: https://datareportal.com/reports/digital-2026-mexico].

Sources (added 2026-10): Facebook https://developers.facebook.com/docs/video-api/guides/reels-publishing , https://postfa.st/sizes/facebook/reels , https://posteverywhere.ai/blog/facebook-aspect-ratios , https://www.biddyco.com/blog-posts/meta-ad-specs , https://postiz.com/blog/facebook-reel-size ; LinkedIn https://www.linkedin.com/help/linkedin/answer/a528176 , https://learn.microsoft.com/en-us/linkedin/marketing/community-management/shares/videos-api , https://www.brandwatch.com/blog/linkedin-video-specs/ , https://postfa.st/sizes/linkedin/video , https://authoredup.com/blog/linkedin-character-limit ; Threads https://developers.facebook.com/docs/threads/overview , https://developers.facebook.com/docs/threads/posts/ , https://searchengineland.com/threads-hashtags-topic-tags-435595 ; Reddit https://www.tella.com/blog/how-to-post-videos-on-reddit , https://typecount.com/blog/reddit-post-character-limit ; Pinterest https://help.pinterest.com/en/article/create-a-pin-from-an-image-or-video , https://linkgrab.io/pinterest-video-size-and-format , https://84pins.com/pinterest-video-pin-specs/ , https://moda.app/resources/sizes/pinterest ; Snapchat https://help.snapchat.com/hc/en-us/articles/7012293789972-How-do-I-submit-a-Snap-to-Spotlight-from-the-web , https://help.snapchat.com/hc/en-us/articles/7012310003348-How-to-Post-a-Snap-to-My-Story-from-the-Web ; 快手 https://www.kuaishou.com/help/feedback/4000?categoryId=hot , https://open.kuaishou.com/platformDocs/openAbility/contentManagement/createAVideo.html , https://a.newrank.cn/trade/news/5958 ; 微博 https://kefu.weibo.com/faqdetail?id=21503 , http://help.sina.com.cn/comquestiondetail/view/422/ , https://m.weibo.cn/outlink_rules.html , https://xueyuan.yixiaoer.cn/article/6317 ; 知乎 https://zhuanlan.zhihu.com/p/420973568 , https://zhuanlan.zhihu.com/p/372236311 ; Dailymotion https://faq.dailymotion.com/hc/en-us/articles/115009030568-Upload-policies-technical-specifications , https://faq.dailymotion.com/hc/en-us/articles/10316200097298-Create-and-manage-hashtags-on-videos , https://developers.dailymotion.com/docs/upload-videos ; TikTok https://support.tiktok.com/en/using-tiktok/creating-videos/camera-tools .

Sources

Section titled “Sources”