Threads Carousel Generator

Converts a text post into a set of visual carousel slides for Threads, Instagram, LinkedIn, TikTok, Stories, YouTube, or a standalone presentation deck. Composable design system with three independent style axes (font × color × purpose) and 12 slide types.

Invocation

/threads-carousel <post text>
/threads-carousel path/to/post.md

Format presets (choose target platform)

Preset	Size	Platforms
threads-4x5 (default)	1080×1350	Threads, Instagram feed (portrait)
instagram-square	1080×1080	Instagram, Facebook, LinkedIn feed
linkedin-square	1080×1080	LinkedIn document post (PDF)
tiktok-9x16	1080×1920	TikTok Photo Mode, Reels, Shorts
story-9x16	1080×1920	Instagram Stories, Threads Stories
wide-16x9	1920×1080	Presentations, YouTube, desktop decks

Slide types (12)

Type	Purpose	Required fields
hook	Opening slide — the catchiest line	text
body	Title + paragraph	title, text
body (points)	Pros/cons list with ✓/✗ SVG icons	title, points[] (instead of text)
list	Numbered items (ordered list)	title, items[]
stats	Big numbers with labels	title, stats[]
quote	Large pulled quote	text, author
checklist	Checkmark bullets	title, items[]
process	Numbered steps with connector line	title, steps[]
comparison	Two-column VS / before-after	leftLabel, leftItems[], rightLabel, rightItems[]
cta	Final call to action	text, handle
image	Title + screenshot/photo + optional caption	imageSrc, optional title, imageCaption
emoji	Giant emoji illustration + title + text	emoji, optional title, text
number	Huge hero number/string + title + text	bigNumber, optional title, text

points shape: Array<{ type: "plus" | "minus"; text: string }> — green ✓ for plus, muted ✗ for minus. Adaptive sizing (44–62px) based on item count and longest line.

All types also support optional:

• badge — small outlined tag above title (e.g. "01", "TIP")
• highlight — a word or phrase within text/title that will be colored in the preset's highlight color (yellow for dark themes)
• highlightStyle: "italic-box" — renders the highlighted word in Playfair italic on a colored rectangle (instead of plain color)

Images in slides

image slides expect imageSrc as a path served by Next.js under /public/. Workflow when a user gives you a local file:

1. User drops a file path like /Users/me/Desktop/screenshot.png (or passes a file via the chat).
2. Copy it into template/public/images/ with a safe, lowercase filename — e.g. cp "$USER_PATH" template/public/images/screenshot.png.
3. In slides.ts reference it as imageSrc: "/images/screenshot.png" (absolute from /public/).

Same-origin serving avoids CORS errors in the PNG export pipeline. Do not use external URLs — html-to-image will often blank them out.

Background decorations (8 types)

Switchable via toolbar in preview. Default: glow.

Type	What it is
none	Solid background
blobs	Organic colored shapes
grid	Dotted grid pattern
lines	Diagonal line pattern
paper	Ruled notebook lines + left margin (use with paper/light/white colors for a literary feel)
noise	SVG grain overlay (overlay blend)
bignumber	Giant slide index as watermark (01, 02…)
glow (default)	Soft radial gradient in alternating corners

Style system (3 independent axes)

The final style is composed at runtime from three axes via composePreset(font, color, purpose):

Font axis (DEFAULT_FONT), 5 typefaces:

Id	Font	Feel
minimal (default)	Unbounded (body + hook)	Geometric display, bold, distinctive
editorial	Playfair Display	Classic serif, literary
clean	Inter	Neutral sans-serif, most standard
mono	JetBrains Mono	Monospace, tech/dev feel
condensed	Oswald	Narrow + tall, editorial poster

Surface axis (DEFAULT_SURFACE) — bg + text neutrals, 8 options:

Id	Bg	Text	Feel
dark (default)	#0A0A0A	white	default bold
white	pure #FFFFFF	near-black	sharp clinical, Apple-style
light	cool zinc #F4F4F5	near-black	neutral cool grey, Vercel-style
paper	cream #ECE2C8	warm brown	notebook / literary warm
gradient	purple→pink→amber	white	bright gradient
pastel	lilac #EDE9FE	indigo	soft
neon	dark gradient	light cyan	tech dark
ember	black→red radial	near-white	dramatic

Accent axis (DEFAULT_ACCENT) — pop color for highlighted words, 8 options:

Id	Hex	Matches surfaces
yellow (default)	#FACC15	dark, ember
red	#DC2626	pure red — white, light, paper
teal	#14B8A6	versatile — dark, white, light, paper
coral	#FB7185	pink-family — paper, light, white
orange	#F97316	pumpkin — paper, light, dark
violet	#A78BFA	dark, neon, ember
lime	#D9F056	ember, dark
blue	#3B82F6	white, light, paper, dark
fuchsia	#C026D3	pastel, white, dark
pink	#EC4899	pastel, dark, light
amber	#F59E0B	gradient, dark, paper

Total combinations: 8 surfaces × 8 accents × 5 fonts × 2 purposes = 640 valid styles. Pick surface for neutral base, accent for pop color — independently.

Reference combos (inspired by design refs):

• dark + teal — noir / minimalist tech
• paper + orange — literary warm
• ember + lime — dramatic announcement
• white + coral — sharp editorial
• light + teal — calm informational

Purpose axis (DEFAULT_PURPOSE):

Id	Title	Body	Divider
carousel (default)	44px, weight 800, UPPERCASE	weight 600, textColor, line-height 1.2	visible (96×4px accent)
presentation	72px, weight 700, sentence case	weight 400, textSecondary, line-height 1.45	hidden

Pick purpose: "presentation" + format: "wide-16x9" for a desktop / YouTube presentation deck. Any 3 × 8 × 2 = 48 combinations are valid.

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Workflow

Step 1 — Get the text

• If passed inline — use it.
• If a file path (.md, .txt) — read it.
• If text is long (>500 chars) — confirm it's complete before planning.

Step 2 — Clarify parameters (optional, can assume defaults)

Ask once, combined:

1. Number of slides (3–10, default 6)
2. Format (see table above, default threads-4x5; use wide-16x9 for a presentation deck)
3. Purpose (carousel or presentation, default carousel)
4. Font (minimal / editorial / clean, default minimal)
5. Color (8 palettes, default dark)
6. Handle for CTA slide (e.g. @username)

Shortcut: if user says "presentation" / "презентация" / "slide deck" → default to purpose: presentation, format: wide-16x9, font: clean, color: white.

If user says "your call" — apply defaults, do not block.

Step 3 — Plan the slide breakdown

Show the user a preview list before generation:

Slide 1 (hook): "Headline..."  [highlight: "word"]
Slide 2 (body): badge 01 — "Title" / "Text..."
Slide 3 (list): badge 02 — "iOS stack" / 3 items
Slide 4 (stats): badge 03 — "Growth" / 3 stats
Slide 5 (quote): "Quote..." — Author
Slide 6 (cta): "Final message" @username

Rules for splitting text into slides

1. Hook = single most intriguing line from the post. 1–3 short lines. Works as a standalone thumbnail.
2. Body slides = one idea each. Max 40 words. Max 5 lines. Never join two ideas with "and".
3. Mix slide types for visual variety: prefer list for enumerations, stats for numbers, quote for direct speech, comparison for VS/before-after. Don't make every slide a body.
4. CTA = conclusion + follow handle. Centered, short.

Step 4 — Generate

Prepare working copy

WORK_DIR="/tmp/carousel-$(date +%s)"
rsync -a --exclude=node_modules ~/.claude/skills/threads-carousel/template/ "$WORK_DIR/"
ln -s ~/.claude/skills/threads-carousel/template/node_modules "$WORK_DIR/node_modules"
cd "$WORK_DIR"

Symlinking node_modules avoids the 350MB copy per run.

Inject content into src/slides.ts

All content + defaults live in src/slides.ts — never touch the engine (src/app/CarouselApp.tsx, src/lib/*). Edit the SLIDES array and the 5 default constants.

Full injection example:

import type { SlideData, BgType, FormatId, FontId, ColorThemeId, PurposeId } from "./lib/types";

export const SLIDES: SlideData[] = [
  { type: "hook", text: "Line one\nline two", highlight: "two" },
  { type: "body", badge: "01", title: "Title", text: "Body text...", highlight: "key" },
  { type: "body", badge: "02", title: "Pros & Cons", points: [
    { type: "plus",  text: "One click to register" },
    { type: "plus",  text: "Works on any background" },
    { type: "minus", text: "Requires provider setup" },
  ]},
  { type: "list", badge: "03", title: "Steps", items: ["First", "Second", "Third"] },
  { type: "stats", title: "Numbers", stats: [
    { value: "10×", label: "Faster" },
    { value: "50%", label: "Smaller" },
  ]},
  { type: "quote", text: "Big idea\nin few words", author: "Someone", role: "2026" },
  { type: "checklist", title: "Pre-flight", items: ["One", "Two", "Three"] },
  { type: "cta", text: "Last word", handle: "@username" },
];

export const DEFAULT_FONT: FontId = "minimal";
export const DEFAULT_COLOR: ColorThemeId = "dark";
export const DEFAULT_PURPOSE: PurposeId = "carousel";
export const DEFAULT_BG: BgType = "glow";
export const DEFAULT_FORMAT: FormatId = "threads-4x5";

Launch preview and export

bun dev --port 3333

Tell the user to open http://localhost:3333. They can:

• Switch Format / Mode / Font / Color / Background live via toolbar rows
• Toggle UI language RU / EN in the top-right
• Click PDF to download all slides in one file (JPEG-compressed, ~5–8 MB for 10 slides)
• Click PNG (a.k.a. "Export All") to download every slide as 01-hook.png, 02-body.png, …
• Click an individual slide thumbnail to export just that one as PNG

After export, stop the dev server.

Parallel carousels

If making multiple carousels at once: create multiple work dirs and launch on ports 3333, 3334, 3335 — they run side by side without conflict.

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Design system

Canonical look (font: minimal, color: dark, purpose: carousel):

• Display typeface: Unbounded (Google Fonts), for hooks — applied only when the font axis provides hookFontFamily
• Body typeface: Space Grotesk (minimal) / Playfair (editorial) / Inter (clean) — everything else uses preset.fontFamily
• Palette (dark): #0A0A0A bg, #FFFFFF text, #FACC15 highlight
• Layout: 80px padding, left-aligned, slide counter bottom-center
• Title discipline: carousel purpose — title → a 96×4px accent divider → body, with ≥64px breathing room above body. Presentation purpose — no divider, sentence case, 72px.
• Hook size: 104–140px, adaptive by character/line count
• Body text size: 48–88px, adaptive
• Text balance: textWrap: "balance" on hook + title (no orphan words)

Typography table (carousel purpose)

The presentation purpose overrides titles to 72px / 700 / sentence case and body to 400 / textSecondary / line-height 1.45.

Element	Size	Weight	Font source
Hook	104–140px	800	hookFontFamily ?? fontFamily
Title	44px	800 uppercase	fontFamily
Body	48–88px	600	fontFamily
Points (pros/cons)	44–62px	600	fontFamily
Badge	26px	800 uppercase	fontFamily
Stats value	140–170px	900	fontFamily
Stats label	32px	500 uppercase	fontFamily
Quote	62px	600	fontFamily
List item	46px	600	fontFamily (numbers 48px)
Checklist item	44px	600	fontFamily
Process step title	36px	700	fontFamily
Handle	36px	500	fontFamily

Common mistakes

Mistake	Fix
Too much text on a slide	Max 40 words, max 5 lines
Two ideas on one slide	Split into two slides
All slides are body type	Mix in list, stats, quote, checklist for visual variety
No hook on first slide	Slide 1 must be the catchiest line
No CTA on last slide	Slide N must end with a handle or call to action
Highlight word too long	Keep highlight to 1–2 words, not whole phrase
Badge has too many characters	Max 2–4 characters (01, TIP, NEW)

Future work / TODOs

• Satori server-side export — replace browser-based html-to-image with Satori + Resvg for CLI export (bun run export → out/*.png). Enables headless runs. See Slashgear/linkedin-carousel-gen for reference.
• Per-slide background override — currently DEFAULT_BG is global; could accept a per-slide bg field to mix decorations across a deck.
• Cyrillic-optimized adaptive sizing — current thresholds are calibrated for Latin; Russian copy tends to be 20–30% longer at the same font size.
• Pencil MCP mode — previous skill version had a manual design mode via Pencil; not currently implemented in the template.