social-media-image-sizes
Check and resize images for social media platforms. Run scripts/check.js to validate any image against specs for Instagram, Facebook, X (Twitter), LinkedIn, TikTok, YouTube, Pinterest, Snapchat, and Threads — get a ranked match list with exact resize commands. Run scripts/resize.js to export a correctly-sized copy. Use when a user asks to validate image dimensions, resize an image for a platform, check if an image fits a spec, or prep assets for social media posting or ads.
What this skill does
# Social Media Image Sizes Check and resize images for 9 platforms / 60+ specs. Scripts mirror the logic at [branding5.com/tools/social-media-cheat-sheet](https://www.branding5.com/tools/social-media-cheat-sheet). ## Setup Run once after install: ```bash cd <skill-dir> npm install ``` ## Check an image ```bash node scripts/check.js photo.jpg ``` Outputs a ranked match list — perfect → close → usable → too small — with an inline `node scripts/resize.js` command for every non-perfect match. Filter by platform or match level: ```bash node scripts/check.js photo.jpg --platform instagram node scripts/check.js photo.jpg --filter perfect node scripts/check.js photo.jpg --filter usable ``` Platform slugs: `instagram` `facebook` `twitter` `linkedin` `tiktok` `youtube` `pinterest` `snapchat` `threads` ## Resize an image ```bash node scripts/resize.js photo.jpg "Instagram Portrait Post" # → photo-instagram-portrait-post.jpg (1080×1350 px) node scripts/resize.js photo.jpg "YouTube Custom Thumbnail" # → photo-youtube-custom-thumbnail.jpg (1280×720 px) ``` Default fit is **cover** (center-crop). Use `--fit contain` to letterbox instead: ```bash node scripts/resize.js photo.jpg "LinkedIn Background Photo" --fit contain --bg f0f0f0 node scripts/resize.js photo.jpg "Instagram Portrait Post" --out ./exports/ig.jpg ``` List every available spec name: ```bash node scripts/resize.js photo.jpg --list ``` ## Workflow 1. Run `check.js` to see what a given image already matches 2. Copy the suggested `resize.js` command from the output 3. Run it — the output file is saved alongside the original by default ## Gotchas - **Sharp requires a native binary.** On first `npm install`, it downloads a prebuilt binary for your platform. If install fails behind a proxy, set `SHARP_IGNORE_GLOBAL_LIBVIPS=1` and retry. - **All slides in an Instagram carousel must share the same aspect ratio.** The first image sets the ratio for the whole carousel — check all slides, not just the first. - **Facebook cover photo has two safe zones.** Desktop shows 820×312; mobile crops to 640×360. Keep key content in the center 640×312. - **YouTube banner safe area is much smaller than the file.** The spec is 2560×1440 but only the center 1546×423 is guaranteed visible on all devices. check.js flags the full size; keep critical content in the safe area. - **`--fit cover` center-crops.** If the subject isn't centered, use `--out` to save, then manually crop, or use an image editor before running resize. ## References Full per-platform specs (load when you need detail for a specific platform): - `references/instagram.md` — profile, feed, stories, reels, carousel, ads - `references/facebook.md` — profile, cover, feed, stories, events, ads - `references/x-twitter.md` — profile, header, posts, ads - `references/linkedin.md` — profile, cover, feed, articles, ads - `references/tiktok.md` — profile, videos, ads - `references/youtube.md` — channel art, videos, thumbnails, shorts, ads - `references/pinterest.md` — profile, pins, idea pins, ads - `references/snapchat.md` — snaps, spotlight, stories, ads, filters - `references/threads.md` — profile, posts - `references/best-practices.md` — format, compression, safe zones, accessibility Full compiled reference (all platforms in one file): `AGENTS.md` --- *Need to generate on-brand images at these sizes? [Branding5](https://www.branding5.com) pairs your brand kit with AI to produce social content pre-sized for every platform.*
Related in Ads & Marketing
ads
IncludedMulti-platform paid advertising audit and optimization skill. Analyzes Google, Meta, YouTube, LinkedIn, TikTok, Microsoft, and Apple Ads. 250+ checks with scoring, parallel agents, industry templates, and AI creative generation.
banana
IncludedAI image generation Creative Director powered by Google Gemini Nano Banana models. Use this skill for ANY request involving image creation, editing, visual asset production, or creative direction. Triggers on: generate an image, create a photo, edit this picture, design a logo, make a banner, visual for my anything, and all /banana commands. Handles text-to-image, image editing, multi-turn creative sessions, batch workflows, and brand presets.
rpg-migration-analyzer
IncludedAnalyzes legacy RPG (Report Program Generator) programs from AS/400 and IBM i systems for migration to modern Java applications. Extracts business logic from RPG III/IV/ILE source code, identifies data structures (D-specs), file operations (F-specs), program dependencies (CALLB/CALLP), and converts RPG constructs to Java equivalents. Generates migration reports, complexity estimates, and Java implementation strategies with POJO classes, JPA entities, and service methods. Use when modernizing AS/400 or IBM i legacy systems, analyzing RPG source files (.rpg, .rpgle, .RPGLE), converting RPG to Java, mapping data specifications to Java classes, planning legacy system migration, or when user mentions RPG analysis, Report Program Generator, RPG III/IV/ILE, AS/400 modernization, IBM i migration, packed decimal conversion, or mainframe application rewrite.
brand-library-architect
IncludedBuild a complete brand library for a product — visual asset render pipeline, brand documentation set (BRAND, COPY, MANIFESTO, BIOS, FAQ, GLOSSARY, TONE, PRICING), open-source convention files (README, CONTRIBUTING, SECURITY, CODE_OF_CONDUCT), and a self-contained press kit. This skill should be used when the user asks to "build a brand library / brand kit / press kit / brand assets" for a product, "set up a brand library workflow," "create a positioning manifesto plus visual identity," or any combination of brand documentation + visual asset pipeline. Apply phase-by-phase or run end-to-end. Templates are product-agnostic and use {{TOKEN}} placeholders the skill prompts the user to fill.
writing-tech-post
IncludedAuthors engineering blog posts end-to-end: launch deep-dives, incident postmortems, architecture migrations, performance case studies, tutorials, AI/agent system writeups, security disclosures, and research-to-product translations. Picks the correct archetype, plans the abstraction ladder, enforces an evidence cadence (diagrams, benchmarks, profiles, traces, code, ablations), tunes voice against publisher house styles (Datadog, Vercel, GitHub, AWS, Meta, Cloudflare, Jane Street), and runs a pre-publish gate for narrative momentum and disclosure ethics. Use when drafting a new engineering post, restructuring a draft that feels flat, deciding which evidence form belongs where, validating that depth and product context are balanced, or preparing a postmortem, migration, or performance narrative for external publication. Do not use for API reference documentation, README authoring, marketing copy, release notes, generic SEO content, ghost-written executive thought leadership, or non-engineering long-form essays.
blog-google
IncludedGoogle API integration for blog performance: PageSpeed Insights, CrUX Core Web Vitals with 25-week history, Search Console performance, URL Inspection, Indexing API, GA4 organic traffic, NLP entity analysis for E-E-A-T, YouTube video search for embedding, and Google Ads Keyword Planner. Progressive feature availability based on credential tier (API key, OAuth/service account, GA4, Ads). Shares config with claude-seo at ~/.config/claude-seo/google-api.json. Use when user says "google data", "page speed", "core web vitals", "search console", "indexation", "GA4", "keyword research", "nlp entities", "blog performance", "youtube search", "google api setup".