Selzee: ROAS Calculator, Ad Size Checker & AI Ad Maker

34 free ad tools in your side panel: ROAS, CPM and CPC calculators, Instagram and TikTok size checkers, image resizers.

Selzee Toolkit puts free marketing calculators and image checkers in Chrome's side panel, so you can work out a number or check an image without leaving the page you're on. What's inside Ad math. Work out return on ad spend, your break-even point, cost per click, cost per thousand impressions and the cost of winning a customer. Each result is compared with typical ranges for your industry, so you know whether it is good. Engagement. Calculate the engagement rate of a post or an account on the social networks you use. Sizes and safe zones. Drop in an image and see whether it has the size a platform expects, and which parts of it the app's buttons and captions will cover. Image tools. Resize an image to the right format for a feed, or split it into a grid. Video tools. Save a video's thumbnail, and draft tags and a description for an upload. Suggestions for the page you're on Click the Selzee icon and the panel suggests the three tools that fit the current page, for example ad math on a product page or engagement tools on a social profile. Favorites Star the tools you use most and they stay at the top of the panel. Ship viral content in 1 click Selzee finds the formats printing money right now and recreates them for your brand every day. Start for free from the panel. Privacy The size checkers run on your own computer, so your images are not uploaded. The extension does not collect or send any data.