Free tools
Free tools for social media
No-signup instruments from the Tesselith team. Use them right here — then let Tesselith do all of it automatically across 11 networks.
Each tool below solves one specific, recurring problem — checking a caption against a platform’s real character limit, building a trackable campaign link, or working out an actual engagement rate instead of eyeballing it. They run entirely in your browser, require no account, and stay free regardless of whether you ever become a Tesselith customer.
Username generator
Handles that fit each network's real character limits and rules — for 15 platforms.
Character counter
Count characters against every network's limit as you type.
Best time to post
Research-backed posting windows for each platform.
UTM link builder
Build tagged campaign URLs you can track in analytics.
Engagement-rate calculator
Work out your engagement rate from reach and interactions.