Free tools
Free tools for social media
Free tools from the Tesselith team, no signup needed. Use them here, then let Tesselith handle it all automatically across 7 networks.
Each tool below solves one everyday 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 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.