How to screenshot your email campaigns before sending

How to Screenshot Your Email Campaigns Before Sending Litmus and Email on Acid charge $100–$400/month to preview emails across clients. For most teams, the real requirement is simpler: see what the email looks like on desktop, mobile, and in dark mode before sending it to 50,000 subscribers. Here's how to screenshot your HTML email template directly — rendered in a real browser viewport — for a fraction of the cost. Screenshot an HTML email template async function previewEmail ( htmlTemplate ) { const res = await fetch ( " https://pagebolt.dev/api/v1/screenshot " , { method : " POST " , headers : { " x-api-key " : process . env . PAGEBOLT_API_KEY , " Content-Type " : " application/json " , }, body : JSON . stringify ({ html : htmlTemplate , fullPage : true , blockBanners : true , }), }); if ( ! res . ok ) throw new Error ( `Screenshot failed: ${ res . status } ` ); return Buffer . from ( await res . arrayBuffer ()); } Full preview matrix: desktop + mobile + dark mode import fs from " f