How to Turn Your Newsletter Into a Carousel (Substack, Beehiiv, ConvertKit)

Your newsletter is probably the best writing you publish anywhere. You think hard about each issue, you cut it down, you find the one idea worth a reader’s time. And then it lands in an inbox, gets one open, and dies. Each issue is a carousel waiting to happen, and the work is mostly already done.

Why newsletters repurpose beautifully

Most content needs to be wrestled into shape before it becomes a deck. A newsletter does not. It is already structured into sections, with a hook at the top and a sign-off at the bottom. It is already your voice, written for humans who chose to hear from you. And it is already validated: you can see what got opened and what got clicked, so you know which issues earned attention before you spend a minute repurposing them.

That is rare. You are not guessing what to post. You are taking writing that already worked and putting it in front of people who will never open an email.

What to pull from one issue

The mistake is trying to fit the whole issue onto slides. Do not. Pull three things and leave the rest in the email.

• The single big idea. One issue, one argument. If you cannot say it in a sentence, the issue is doing two jobs and you should pick one.
• Three to five key points. The sections, the steps, the takeaways. These are your slide sequence.
• The closing line. The sign-off or the question you ended on. It often makes the best final slide.

Step by step

1. Pick the spine

Find the issue’s skeleton: the big idea plus the three to five points that carry it. If an issue rambles, it will make a rambling carousel, so choose a tight one or trim before you start.

2. One point per slide

Give each point a headline and a sentence. If you are pasting a whole paragraph, you have not compressed enough. The carousel is the trailer; the issue is the film.

3. Make the cover the issue’s hook

Your subject line or opening line is usually the strongest hook you have, because it already earned the open. Lead with it. A search-friendly headline rarely stops a scroll, so sharpen it.

4. End with a CTA

Close by sending people somewhere: subscribe to the newsletter, or read the full issue. Pick one clear ask, not three (see CTA ideas).

The fast way

Doing this by hand for every issue gets old. If your issue has a public web version, paste that URL into Supaslides: it reads the page, builds an on-brand theme from your real colours, fonts and logo, and Claude writes the slide copy and picks a layout per slide. Then you export for each platform, Instagram, TikTok or a LinkedIn document post, from one deck. It is the same idea as turning any link into slides (see the URL to carousel walkthrough), and it pairs with the longer blog-to-carousel process when your issue reads more like an article.

Make it a system

The real win is not one carousel. It is the habit: every issue becomes one carousel, on the same day you send it, while the idea is fresh. Batch a month of them at once (see batching a month of carousels), or take each issue and ship it to every platform in one pass. The newsletter you already write becomes a second channel for free.

You did the writing once. Let it work twice. The inbox gets the issue; the feed gets the same idea in front of people who never signed up, and some of them will.