Free Facebook ad tools for online sellers.

For the feed, a square 1080 × 1080 or a portrait 1080 × 1350 takes the most room on screen. The Facebook Image Resizer makes both, plus the 1200 × 628 image shown when you share a link.

Meta's ads guide recommends 50 to 150 characters of primary text and 27 for the headline in the Facebook feed (checked on 3 November 2026). Those are recommendations, not limits: longer text runs, but the app may cut it with See more. The Facebook Ad Preview and the Ad Character Counter check your text against them.

Upload a product photo to the Facebook Ad Copy Generator: you get three headlines, three primary texts that each lead with a different benefit and three link descriptions, so you can test angles against each other. The Ad Headline Generator writes headlines that aim for under 40 characters. Neither writes a price, a discount or a promo code you didn't give it.

It depends on your margins: a ROAS is good when it's above your break-even ROAS. Enter your price and costs in the Break-even ROAS Calculator to get yours, then compare it with the ROAS Calculator's result for your campaign.

Tag each ad's link with the UTM Builder: utm_source, utm_medium and utm_campaign, plus utm_content to tell apart two ads in the same campaign. Google Analytics and other tools then show which ad brought each visitor.