Free online social media tools
10 free online utilities for captions, threads, hashtags, scheduling CSVs, and more in your browser. Built by Postmixr for creators who ship on time.
Social Media Character Counter
Free online Instagram, TikTok, and Threads character counter with emoji-aware limits. Check caption length before you schedule. No signup.
Open tool →Free toolSocial Media Image Sizes Cheat Sheet
Free online cheat sheet for Instagram post size, TikTok video dimensions, YouTube thumbnails, and more. Reference for creators. No login.
Open tool →Free toolUTM Link Builder
Free online UTM link builder for Instagram, email, and paid ads. Add campaign tags and copy your trackable URL in one click.
Open tool →Free toolThread Splitter for X & Threads
Free online thread splitter for X and Threads. Split long posts into 280 or 500 character chunks with smart sentence breaks. No signup.
Open tool →Free toolLinkedIn Text Formatter
Free online LinkedIn text formatter for bold and italic Unicode posts. No extension needed. Copy and paste into LinkedIn instantly.
Open tool →Free toolYouTube Title Character Counter
Free online YouTube title character counter (100 max) with search truncation preview. Check length before upload. No signup.
Open tool →Free toolHashtag Generator for Instagram & TikTok
Free online hashtag generator for Instagram and TikTok from your niche keywords. Curated lists, no AI. Copy in one click.
Open tool →Free toolCaption Templates & Ideas
Free online Instagram caption templates for hooks, carousels, CTAs, and educational posts. Copy, customize, and publish.
Open tool →Free toolBest Time to Post on Social Media
Free online guide to the best time to post on Instagram, TikTok, LinkedIn, and more by timezone. Reference chart for smarter scheduling.
Open tool →Free toolCSV Bulk Schedule Validator
Free online CSV validator for bulk post scheduling (caption + ISO datetime per line). Line-by-line errors before you import to Postmixr.
Open tool →Free online SEO tools for social media creators
Every utility on this page runs in your browser, no account, no API keys, and no data sent to our servers for the core features. Start with the Instagram character limit counter, thread splitter, and social media image sizes. Marketers can build trackable links with the UTM link builder, validate bulk CSVs with the schedule CSV checker, and plan timing with best time to post.
Postmixr is a scheduling workspace for Instagram, TikTok, YouTube, Facebook, Threads, and Pinterest. These tools use the same limits and formats as our product, validate here, then schedule from one calendar.