One composer per network
Seven composers, seven rule sets — built per network
X counts down from 280 and threads. Instagram pairs caption with image and shows the grid. LinkedIn handles long-form. TikTok and YouTube attach caption to video.
X composer: 280-character counter, thread builder, link card preview
Instagram composer: caption plus image upload, alt text, grid view
LinkedIn composer: long-form text, paragraph breaks, professional preview
Live preview before publish
See the post in its native layout while you type
Preview renders your draft in each platform's real layout: X cards, Instagram square crops, LinkedIn paragraphs, TikTok caption over video. Mobile and desktop render side by side.
Mobile and desktop renders for every network, updated as you type
Thread sequencing on X — see the full chain before sending
Instagram grid preview shows the new post next to your last eight
Media and hashtag tools per composer
Image, video, and hashtag pickers built into each composer
Each composer lets you upload media, pick from library, generate an image, or pull stock. Hashtags match the network: Instagram up to 5, X 1–3, LinkedIn 3–5. One click saves.
Image upload, AI generation, stock search, library access in every composer
Hashtag picker tuned to each network's count and style conventions
Save to drafts, schedule to the calendar, or publish straight away
1
Pick the network
Choose X, Instagram, LinkedIn, TikTok, YouTube, or Threads. The right composer opens.
2
Write inside the composer
Type the post. Counter, media slot, and hashtag picker match that network. Switch tone if you want.
3
Check the live preview
Preview shows the post on mobile and desktop in the real layout. Adjust copy or swap image.
4
Schedule or publish
Save as draft, schedule to a slot, or publish now — formatted for the network it was written for.
Per-platform post composers — questions and answers
Questions about how the composers differ across networks? Read on or contact support.
What does platform-specific actually mean here?
Each of seven networks gets its own composer with its own rules: 280 chars on X, image-plus-caption on Instagram, long-form on LinkedIn, caption-plus-video on TikTok and YouTube.
Which networks have a dedicated composer?
Seven: X with threads, Instagram with caption plus image or carousel, LinkedIn for long-form, TikTok with 9:16 video, YouTube for Shorts and standard, Threads for short conversational, Bluesky for 300-character posts.
How does the live preview work?
As you type, preview renders in the real layout: cards on X, square or 4:5 on Instagram, paragraph spacing on LinkedIn, caption over video on TikTok. Mobile and desktop render side by side.
Can I build a thread on X or a carousel on Instagram?
Yes. X threads chain multiple posts with the full chain in preview. Instagram supports single image, carousel up to 10 slides, and Reels. Each slot has its own character count.
Does the composer enforce character limits?
Yes. X stops at 280. Instagram caption cap 2,200. LinkedIn allows 3,000. TikTok caption cap 2,200. YouTube description 5,000. Threads 500. Each composer counts down to its own ceiling.
Can I add images and video inside the composer?
Yes. Each composer has upload, stock search, AI generation, and library access. Instagram and TikTok require media; X and LinkedIn treat it as optional. Dimensions are applied on upload.
How do hashtag suggestions differ per network?
The picker adapts: Instagram up to 5 broad-plus-niche, LinkedIn 3–5 professional, X 1–3 trending, TikTok sound and trend tags, YouTube video-search tags, Threads conversational.
Can I schedule directly from the composer?
Yes. Click Schedule for date and time, or use Smart Schedule for the next high-engagement slot. Save to drafts or publish now. Free plan covers basic scheduling; paid plans add analytics.
Which plan tier unlocks all seven per-network composers and their previews?
All seven composers (X, Instagram, LinkedIn, TikTok, YouTube, Threads, Bluesky) are on every paid plan: Premium with 15 channels, Business with 20 channels, Teams (per-user pricing, 5-user minimum). The Free plan also includes every composer under its 10-posts-a-month cap, so you can try each editor.
Do the composers expose a public REST API for programmatic per-network posting?
Partially. The public posts API (API-key auth) creates and schedules posts; docs at postnext.io/api. It does not expose per-network composer validation, and there are no webhooks. The MCP server is the richer machine surface.
Can I draft posts in multiple languages inside one per-network composer?
Yes. The AI Content Creator inside each composer supports 50+ languages including English, German, Spanish, French, Portuguese, and Russian. Set the brand profile's default language and the AI captions, hashtag suggestions, and SEO meta arrive in that language. Override per post. Character counts apply identically across languages.
How do composers handle GDPR-sensitive content like customer DMs or audience data?
Composers never read your DMs: only posting scopes are requested during OAuth, never message-read. Drafts stay in your workspace and tokens are stored encrypted. There is no separate EU-region hosting today.
Can I A/B test two AI-generated captions side by side in the composer?
Not built in. Ask the AI for two variants, schedule both, and compare engagement in analytics; there is no experiment tagging.
Can I bulk-create posts across all seven per-network composers from one brief?
Yes. Paste a brief into the bulk composer, pick target channels, and PostNext generates network-tuned drafts: X thread, Instagram caption plus image prompt, LinkedIn long-form, TikTok 9:16 script, YouTube description, Threads short-form. Each draft respects per-network rules. Business plans allow up to 20 channels in one bulk run.
Do the per-network composers work on a phone or only on desktop browsers?
All seven composers are responsive on iOS Safari and Android Chrome. Drafting captions, picking hashtags, queueing posts, and Smart Schedule work on mobile. Live preview renders at the network's actual aspect ratio. Richer flows like X thread reorder or Instagram carousel reshuffle are easier on tablet or desktop, but reachable on phone.
Can I migrate composer drafts from Buffer or Later into PostNext composers?
Yes. Export your draft queue as CSV from the previous tool and drop into the PostNext bulk uploader. The mapper recognises caption, channel, date, time, and media URL columns and routes each row into the matching per-network composer. Brand profile tone and Smart Schedule layer on top so drafts match your setup.
Stop pasting one caption into every network
Open seven composers, write seven posts that fit. Free plan available; see the pricing page for plans. Seven-day trial on paid plans.