Turn your Substack newsletter into a Reddit post that doesn't read like marketing
Letterfork rewrites your Substack issue into one Reddit-ready post in your voice — substantive long-form, honest tone, no emojis, no link bait. It writes the title separately (the most important line on Reddit), produces the body in Markdown with paragraphs and optional headings, and hits the 500–2000 word sweet spot most substantive subreddits reward. Free for your first 3 rewrites.
Why Reddit is underused by newsletter writers — and why that's the opportunity
Most newsletter writers ignore Reddit because it's culturally hostile to anything that smells like marketing. They're right to be cautious. They're also missing the highest-engagement long-form audience on the internet outside of Substack itself.
A well-written post in r/Entrepreneur, r/Substack, r/SideProject, r/NewsletterCollective, or any niche-relevant subreddit can drive 50–500 subscribers in a weekend if it leads with substance and follows community norms. The trick is sounding like a member, not a brand.
Letterfork is built for this. The Reddit output has no emojis, no hashtags, and no "check it out" link-baiting. The tone is honest and slightly self-deprecating — Reddit punishes confident-sounding marketers and rewards "here's what I learned" framings.
How to turn a Substack issue into Reddit
- 1
Set up your voice profile
Paste 5–10 past Substack URLs. Letterfork extracts your style fingerprint once, then reuses it for every rewrite.
- 2
Paste your Substack URL
Public Substack URLs work directly. For paywalled posts, paste the body text into the rewrite form instead.
- 3
Select Reddit from the platform list
Uncheck other platforms if you only need Reddit today. One platform = one LLM call = ~15 seconds.
- 4
Generate and review
Letterfork outputs the title on the first line, then the body in Markdown — paragraphs, optional bullets, optional H2 headings if the post runs over 1000 words.
- 5
Pick a subreddit and post
Letterfork doesn't post for you. Pick a subreddit where your topic fits, read the rules, and submit. The Custom prompt instructions feature on Pro and Unlimited lets you tell Letterfork things like "target r/Entrepreneur, soft on self-promo, no product link."
What the output looks like
Reddit · title
After running 30 voice-clone experiments on my own newsletter, here's what actually worked
Reddit · body (excerpt)
Quick context: I write a weekly newsletter and have spent the last six months trying to find an honest way to repurpose it across LinkedIn, X, Bluesky, and Substack Notes. Most of what I tried was bad. Here's what didn't work: - ChatGPT with a "write in my voice" prompt. The output read like a LinkedIn growth coach every single time, no matter how I phrased the prompt. - Hiring a VA. They could replicate the format but not the tone, and the cost ($500/month) ate into the time savings. - Just posting "new piece, link in bio." Lazy and got zero engagement. What actually worked was…
FAQ
Which subreddit should I post to?
Letterfork doesn't pick for you — that's a strategic decision specific to your topic. Common fits for newsletter writers: r/Entrepreneur, r/Substack, r/SideProject, r/NewsletterCollective, r/SaaS, r/IndieHackers, plus niche subreddits matching your topic. Always read the subreddit's rules and look at what's been upvoted recently before posting.
Won't Reddit ban me for self-promotion?
Most subreddits enforce a 9-to-1 rule (9 community contributions for every 1 self-promo post) and have hard rules against link-dropping. Letterfork's Reddit output deliberately downplays product mentions — it leads with substance and at most mentions a project name once. Always check the specific subreddit's self-promotion policy.
Why no emojis or hashtags in the output?
Reddit punishes both. Emojis read as marketing and most subreddits don't index hashtags at all. Letterfork strips them by default for Reddit and includes them on platforms (Instagram, LinkedIn) where they help.
How long should a Reddit post be?
500–2000 words is the sweet spot for substantive subreddits. Shorter reads as "just promoting a link"; longer loses readers. Letterfork aims for this range and adds an optional TL;DR if the body exceeds 800 words.
Can I customize the tone for a specific subreddit?
Yes — on Pro and Unlimited plans. Add a per-platform Reddit instruction like "target r/Entrepreneur, more first-person, lead with the result" in your Settings. Letterfork applies it on top of your voice profile.
What about cross-posting to multiple subreddits?
Reddit's algorithm penalizes identical posts across subreddits within a short window. Run the rewrite once, post to one subreddit, and if you want a second one a week later, run a fresh rewrite — your voice will be the same but the wording will vary.