Free tools
Free tools for posting to four platforms
No sign-up, and nothing leaves your browser. They use the same rules PostOneGo checks before it publishes.
Caption length checker
See a caption against every platform's character, hashtag and mention limits as you type.
OpenVideo spec checker
Drop a video or image and find out which platforms will accept it, and why not if they won't.
OpenSocial media video specs
Lengths, sizes, formats and aspect ratios for Instagram, Facebook, LinkedIn and YouTube on one page.
Open