About
About MarketKitHub
MarketKitHub is an independent collection of free, single-purpose web tools for creators, marketers and anyone who has to get a file or a piece of copy "just right" before it goes out.
Our tools
- Social Media Safe-Zone Overlay Tester: see where TikTok, Instagram Reels, Stories and YouTube Shorts buttons and captions will cover your video frame.
- AI Copywriting Character Counter & Formatter: check copy against the character limits of X, Meta ads, LinkedIn and Google search snippets, and clean up formatting in one click.
- Exact-Size PDF & Image Optimizer: shrink a JPG, PNG or PDF to fit an exact upload limit in KB.
Why we built them
Each tool solves one small but annoying problem that comes up again and again: a caption hidden behind a Like button, an ad headline cut off mid-word, or an upload portal that rejects a file for being a few kilobytes too big. Instead of a bloated app with sign-ups and paywalls, every MarketKitHub tool opens instantly, does one job well and explains how to use it in a detailed guide on the same page.
Private by design
All of our tools run entirely in your web browser. Your images, text and files are processed on your own device and are never uploaded to us or stored by us. There are no accounts to create and nothing to install. You can read the details in our Privacy Policy.
How the tools stay free
MarketKitHub is supported by advertising served by Google AdSense. Ads never change how a tool works or what it shows you, and they never see the content you work with.
Independent and not affiliated
TikTok, Instagram, YouTube, X, Meta, Facebook, LinkedIn and Google are trademarks of their respective owners. MarketKitHub is independent and is not affiliated with, endorsed or sponsored by any of them. Platform limits and layouts change over time, and we update the tools and guides as they do.
Get in touch
Found a bug, spotted an outdated limit or have an idea for a new tool? We would love to hear from you. Visit our Contact page or email hello@marketkithub.com.