Letterfork

Repurpose your newsletter into 7 social platforms
— in your own voice

Letterfork is the AI tool that turns one Substack, Beehiiv, or Ghost issue into LinkedIn posts, X threads, Bluesky posts, Substack Notes, Threads, Instagram captions, and Reddit drafts — in 60 seconds, in the way you already write. Free for your first three rewrites.

Try free. No credit card.

3 free rewrites · cancel any time · works with Substack, Beehiiv, Ghost

From newsletter to social, in your voice

The same piece, reshaped for each platform, in the way you write.

Your newsletter (excerpt)

I write one newsletter a week. The writing itself takes 2-3 hours, and I actually enjoy that part. But the "repurposing" tax—reshaping that one piece for five different platforms—eats another 3-4 hours.

That's roughly 15 hours a month I spend doing glorified data entry on my own words. Not researching. Not talking to users. Just copying, pasting, trimming, and fighting with character limits.

I talked to about thirty other writers about this recently. Some have 500 subs, some have 50,000. The consensus? Everyone absolutely hates this part. Some refuse to do it and abandon social media entirely. Others pay a VA $500 a month to handle it. Most just half-ass it with a generic "New post out, link in bio" and call it a day.

None of those felt like the right answer.

→ LinkedIn post

15 hours a month.

That's how long I spend doing glorified data entry on my own words. Not researching. Not talking to users. Just copying, pasting, trimming, and fighting with character limits. One newsletter, five platform-native posts, every single week.

I asked around. About 30 newsletter writers, 500 to 50K subs. Same answer every time: everyone hates the repurposing tax.

Here's what writers actually do about it:
→ Some quit social entirely.
→ Some pay a VA $500/month to handle it.
→ Most just post "new piece out, link in bio" and move on.

None of those felt like the right answer.

So I'm building one.

→ X thread (1/4)

I spend 15 hours a month doing glorified data entry on my own words.

Writing the newsletter takes 2-3 hours. I love that part. Reshaping it for 5 platforms eats another 3-4. Every. Single. Week.

Asked 30 other writers about this. Everyone hates it. No one has a clean fix.

How Letterfork works

Three steps. The first one happens once.

1

Train your voice

Drop in 5–10 of your past newsletters. Letterfork extracts your sentence rhythm, opening habits, vocabulary, and humor. Once.

2

Paste a newsletter

URL or full text. Substack, Beehiiv, Ghost, or anything else. Letterfork pulls the title, author, and body in seconds.

3

Copy & post

A minute later: seven platform-native posts, ready to paste. One Copy button per piece.

Newsletter → every platform

One issue, seven platform-native posts. Each link below is the dedicated playbook for that source-and-destination pair.

Substack → LinkedIn

Hook-led posts, single-sentence paragraphs, comment-inviting CTAs.

Substack → Bluesky

300-char chains in your voice. No "🧵 1/" thread tics.

Substack → Reddit

Honest, member-not-marketer tone. 500–2000 word sweet spot.

Substack → Substack Notes

150–280 word Notes that end in a question or stance.

Newsletter → Threads

Casual register. Group-chat tone. 200–500 chars.

Beehiiv → LinkedIn

Same playbook, Beehiiv-aware URL parser.

Or read the full playbook: The 7-platform repurposing playbook →

Get back your Sunday night

Stop spending 3 hours reformatting your newsletter for every platform. Try it free, no credit card.

Start free

Questions, answered

Which platforms are supported?

Seven: LinkedIn, X, Bluesky, Substack Notes, Threads, Instagram, and Reddit.

Can I edit the output?

Yes. Every output is plain text, copy-pasteable. We don't auto-publish; you stay in control.

Do you train on my newsletters?

No. Your past newsletters are used to extract a one-time style description that lives in your account. We never train models on your content, and your data is never shared.

What if my newsletter is paywalled?

Paste the full text directly. Letterfork's URL parser only works on publicly visible newsletter pages.

Why not just use ChatGPT?

I tried that for about a year. Every rewrite started with a wall-of-text "this is how I write" prompt at the top, and the output still read like a LinkedIn growth coach wrote it. Letterfork extracts your voice once from your past newsletters and reuses it. It also knows X thread pacing, LinkedIn hook structure, IG caption length — you don't have to teach the platform conventions every time.

A note from the founder

Super

building Letterfork in public

I built Letterfork because I was spending 4 hours every week reshaping my own newsletter for five platforms, and none of the tools I tried understood how I write.

The MVP just launched. I'm looking for newsletter writers who'll try it and brutally tell me what works and what sucks. If you write a newsletter at any size, you're who I built this for.

Reply to any email I send and it lands in my inbox. I read every one.

— Super