You open the Substack composer and it asks what you want to create. A Note? A post? Your friend calls the long one an "article" and the help pages call it a "post." Then you read that Notes are where the growth is, and you wonder if the essay you spent a week on was the wrong thing to write.
The two formats do different jobs, and once you see the jobs, choosing gets easy. This post lays out the differences side by side, then shows how to turn either one into an image for Instagram.
What Is the Difference Between a Substack Note and an Article?
A Substack Note is a short, public piece of writing that lives in the Notes feed and is never emailed to anyone. An article is a long-form post published to your publication, sent to subscribers by email, and free or paid, depending on how you publish it. Substack's own menus call the long format a "post," but most writers say "article," and this guide uses both for the same thing.
Substack states the main rule in its Notes FAQ: readers are never notified by email when you post a Note, and Notes are public, so you cannot save one for paying subscribers only.
| Note | Article (Substack "post") | |
|---|---|---|
| Length | Short-form | Long-form |
| Emailed to subscribers | No, never | Yes, when published |
| Paywall | No, always public | Free or paid |
| Where it lives | The Notes feed and your profile | Your publication, at a /p/ URL |
| Media | Images, video, links | Full post editor |
| Scheduling | Yes | Yes |
| Best job | Discovery and conversation | Depth and subscriber value |
Why Does Substack Have Both?
Because the two formats feed each other. Articles are what readers subscribe for. Notes are one of the ways strangers find out an article exists. Substack's about page says more than half of new subscribers come from its built-in network, and names Notes among the ways readers discover new voices.
The audience is big enough for that to matter. Backlinko's Substack tally counts 35 million active subscriptions as of September 2025, and Substack says 5 million of those are paid.
This is also why a Note can be cheap to write. It does not have to carry an argument. It has to give a stranger one reason to tap your name.
When Should You Write a Note?
Write a Note when the idea fits in a few lines, or when you want a reaction more than a read.
- A single sharp observation. One sentence from your draft that stands on its own.
- A quote from your own article. Pull one line and let it carry a link to the full piece.
- A question to other writers. Notes have replies and restacks, so they work for conversation.
- A photo or a short clip. Things that do not need an essay around them.
- A reaction to someone else's post. Restack it with a line of your own.
When Should You Write an Article?
Write an article when the idea needs room: a full argument, a story with a middle, a how-to with steps, or anything you want a subscriber to keep and reread. Among the written formats, articles are the only one you can put behind a paywall, so if part of your plan is paid subscribers, the paid value lives here.
Articles are also the pieces that get a permanent address. A Note scrolls away in a feed. An article sits at its own URL, and you can link to it from your bio, your newsletter, and every Note you write afterward.
How Do Notes and Articles Work Together?
The simplest pattern is article first, Notes after. You publish the article, then spend a week posting Notes that each pull one idea out of it. Each Note is a door back to the full piece.
Substack suggests a version of this itself. Its Notes FAQ describes promoting a recent post by sharing a quote from it. A few ways to do that:
- Restack your own article with one line on top. Say what changed your mind while writing it, not just "new post."
- Post the best sentence as its own Note. Put the link in a reply or the next Note.
- Post the counterargument you cut. People reply to disagreement more than to announcements.
- Answer a reader's comment as a Note. It becomes a second piece of content from one exchange.
Going the other way works too. If a Note gets a lot of replies, that is a signal the topic deserves an article.
How Do You Measure Each One?
The two formats report results differently, which changes what you can learn from each.
For a Note, Substack's getting started guide says you can open "View stats" on the note on the web or in the app, and that the stats show up within 24 hours of posting and usually refresh every hour. That makes Notes a fast test. You can post three versions of the same idea in a week and see which one people respond to.
An article reports through your dashboard's post stats, and it moves more slowly because it depends on email opens and search traffic over weeks. So a practical split is to use Notes to find out which idea has pull, and to spend your long writing time on the one that won.
How Do You Turn a Note or an Article Into an Image?
Substack is a text platform, and Instagram is not. Both formats can become images, but they need different tools because one is a few lines and the other is thousands of words.
| You have | Turn it into | Tool |
|---|---|---|
| A Note | One card that looks like a post | Short post, with Substack as the source |
| A strong line from an article | A quote card | Medium form |
| An article you want summarized | A swipeable carousel | Thread Generator, then Thread to Carousel |
| A public article you want shown whole | A page-by-page image series | Article Screenshots (paid) |
Turning a Note into a card
Paste the public Note link into the short-post tool and Notes2Pic imports it into the Substack layout. Check the author details and text, then edit anything you want. Text you enter directly is capped at 500 characters, which is usually enough for a Note. The walkthrough for turning Substack Notes into Instagram posts covers the details, and a line you want to set as a pure quote belongs in the Instagram quote maker format instead.
Pick Portrait (1080x1350) if the card is headed for the Instagram feed, or Square if you plan to share it in chats. Exports need a sign-in. The free tier gives you 5 exports per rolling 30 days, each with a small "made with Notes2Pic" watermark, and paid removes both the cap and the watermark.
Turning an article into a carousel
An article is too long for one card, so the job is to pick the idea and cut the rest. Paste the text into the Thread Generator, or give it a public article link, and it restructures your essay into a numbered set of short posts. Some pages block link fetching, such as paywalled or bot-protected ones, and then you paste the text yourself. The free tier includes 3 AI thread generations over the life of the account.
Then send the result to Thread to Carousel, which splits it into slides and exports a ZIP of PNGs. Carousels are worth the effort: Socialinsider's benchmark data has carousel posts averaging 0.55% engagement against 0.37% for single images. The guide to Instagram carousel sizes has the dimensions to export at.
Showing a whole article as images
Article Screenshots is a separate, paid feature. You give it a public *.substack.com/p/... link and it returns the article as a clean, page-by-page PNG ZIP. You review the rendered pages before you download. It is for cases where the article itself is the thing you want to show, like a reader-style preview, and not a summary. It is not a free tool and not part of the free tier.
Which one should you pick?
Use the card for a Note and the carousel for a summary. Use Article Screenshots only when the reader should see the whole piece. For a longer comparison of the repurposing routes, how to repurpose Substack to Instagram and turning Substack posts into social media graphics go through more examples.
What Mistakes Do Writers Make With Notes and Articles?
These are the four I see most, and each one has a cheap fix.
- Writing a Note like a small essay. A Note with three paragraphs of setup gets skipped. Put the point in the first line and cut the setup.
- Using Notes only to announce articles. A feed of "new post, link below" gives a stranger no reason to follow you. Lead with the idea and let the link come second.
- Writing an article for an idea a Note could have carried. If it fits in four lines, it probably did not need 1,500 words. Post the Note, and write the article only if the replies ask for more.
- Cutting an article into slides without choosing one idea. A carousel that tries to carry the whole essay reads like a summary nobody asked for. Pick the single claim the article is built on and let the slides prove it.
FAQ
Is a Substack post the same as an article? Yes. Substack's interface says "post," and most writers say "article." Both mean the long-form piece that goes to your subscribers and lives at its own URL.
Can I email a Note to my subscribers? No. Substack says readers are never notified by email when you post a Note. To reach your email list, you publish an article.
Can I put a Note behind a paywall? No. Notes are public and visible to anyone on the Substack network.
Do I have to write Notes to grow? No rule says so. Substack lists Notes as one discovery route among several, alongside recommendations, so some writers lean on them and some publish only articles.
Can I turn a newsletter into a Twitter-style thread instead? Yes. The guide to turning a newsletter into a thread covers that route, and the thread can then become a carousel.
Pick the Format by the Job
A Note is for discovery and conversation, and it is always public and never in anyone's inbox. An article is for depth, sits at its own URL, goes out by email, and can be paid. Write the article first, pull Notes out of it afterward, and turn the best of either into an image when you want the work to travel past Substack.