A small kit of free social tools
AI-powered helpers and quick utilities. Everything runs entirely in your browser — no signup, no API keys, your data never touches a server.
- AI · in browser
Caption generator
Brief in a sentence, get a tuned caption per platform. Runs entirely in your browser.
- AI · in browser
Hashtag generator
Drop a topic, get the relevant hashtags for X, LinkedIn, or Instagram.
- AI · in browser
Content idea generator
Niche, audience, format — get a tight list of post ideas to ship.
- AI · in browser
Content repurposer
Paste a post, get adapted versions for every other channel.
X character counter
Real-time character count, emoji-aware, Twitter intent link.
X thread maker
Auto-split long-form into 280-char tweets, copy and post.
X photo resizer
Resize any image to X's recommended aspect ratios.
LinkedIn photo resizer
Resize cover photos and profile images to LinkedIn specs.
UTM generator
Build clean tracking URLs without remembering the param names.
Username checker
See whether a handle is free on Instagram, TikTok or YouTube, and who has it if not.
Social media image resizer
Resize an image to the dimensions Instagram, Facebook, LinkedIn, X, TikTok, Pinterest or YouTube expects, entirely in your browser: no upload, no signup.
Social media image sizes
Every social image size in one place: Instagram, YouTube, Facebook, LinkedIn, X and TikTok, with the ratio each forces and a browser check of your own file.
Social media character counter
Count characters against the real limits for X, Instagram, LinkedIn, TikTok, Facebook, YouTube and Threads. Emoji-safe, live as you type, nothing uploaded.
Social media line break generator
Keep the paragraph spacing Instagram, LinkedIn, TikTok, Facebook and Threads would otherwise strip. Paste a caption, copy the spaced version, post as written.
Creator earnings calculators
Estimate what your audience is worth on YouTube, TikTok and Instagram. Each calculator uses published benchmarks and shows its working, not a made-up number.
Engagement rate calculators
Calculate engagement rate by followers, by reach, or averaged across posts, for Instagram, TikTok, YouTube or any platform. Each one shows its working.
Marketing calculators
Ten marketing calculators that show their working: CPM, CPC, CTR, conversion rate, ROI, LTV, CAC, A/B significance, ad budget and break-even, formulas shown.
Social media username generator
Turn a word into handle ideas that fit YouTube, Instagram, TikTok, LinkedIn or Pinterest, each checked against that platform’s real character rules first.
Social media font generator
Turn plain text into bold, italic, script, monospace or circled lettering for an Instagram, TikTok or X bio. Real Unicode characters, so they paste anywhere.
YouTube tools
Six free YouTube utilities that work off the URL alone: grab thumbnails, build subscribe and timestamp links, write embed code and schema, find a channel id.
Best time to post on social media
Week-by-hour engagement heatmaps for Instagram, TikTok, Facebook, LinkedIn, YouTube, X and Threads, read in your own timezone rather than an American one.
Instagram grid planner
Plan how your Instagram profile grid will look before you publish. Drag to reorder, preview the three-across feed, and keep every image on your own device.
Free text tools
Eight text utilities that run in your browser: case converter, word counter, cleaner, invisible character, repeater, reverse, line break remover, replace.
Aspect ratio calculators
Calculate an aspect ratio from any width and height, or solve a missing side from a locked shape, with Instagram, YouTube and TikTok pages for their shapes.
Need more creative tools? Try OctoSpark.
Each free tool does one job. OctoSpark gives you the whole kit: posts and captions in your own voice, images and slideshows, and one calendar that publishes to every network and shows what performed.
No card needed. These tools stay free either way.