How this free social media scheduler & poster works
Pick the platforms you want — X, Instagram, LinkedIn, TikTok, Pinterest, Facebook, Threads, YouTube — and a per-platform section appears under the universal caption. Each section exposes only what changes per network (reply control, post type, board ID, visibility). Sign in to Postmixr to actually publish the same draft everywhere on one schedule.
How the binding character limit works
When you cross-post, the smallest selected platform sets the cap (X 280, Bluesky 300, Threads 500, Pinterest 500). The universal counter on this page uses that smallest limit so your draft fits everywhere. Postmixr also lets you set per-platform caption overrides after sign-up.
One calendar instead of eight tabs
Most teams open Buffer for X, Meta Business Suite for Facebook + Instagram, YouTube Studio, TikTok's native scheduler, Pinterest's scheduler, and a doc for everything else. This tool collapses that into one composer so you can write once, override per-network, and queue across networks in a single click after sign-up.