How to Auto-Post to Facebook and Instagram at the Same Time
Facebook and Instagram are owned by the same company, so getting one post onto both takes about two minutes to set up — and there are three ways to do it. Here's the setup, plus the five places identical cross-posting quietly makes you look careless.
Dave Smith
# How to Auto-Post to Facebook and Instagram at the Same Time
It's the same photo. The same caption. The same business, the same customers, largely the same message. And yet there you are, posting it once, then opening a second app and doing the entire thing again.
Doing it twice is one of those small, daft tasks that quietly puts people off posting at all. Not because it's hard — because it's the second one that never happens. You post to Instagram, mean to do Facebook later, and later turns into next week.
The good news is that Facebook and Instagram are owned by the same company, so getting one post onto both is genuinely straightforward. The less good news is that "the same post everywhere" isn't always the right answer. Here's how to set it up, and where to be a bit careful.
Set it up once, properly
Before anything auto-posts anywhere, two things need to be true.
Your Instagram account needs to be a Business or Creator account. Personal accounts can't cross-post or connect to scheduling tools. In Instagram, go to your profile settings and look for the account type option — switching is free, takes about thirty seconds, and doesn't lose you followers or posts.
Your Instagram and Facebook Page need to be linked. This happens in Meta's Accounts Centre, which you can reach from settings in either app. You're looking for the section about connected experiences and sharing across profiles, where you add your Facebook Page and Instagram account to the same group.
Meta reshuffles these menus roughly once a year, so the exact wording may have drifted by the time you read this. The concept doesn't change: one Accounts Centre, both profiles inside it.
Once that's done, you've got a few options.
Option one: tick the box when you post
The simplest version. When you publish to Instagram, on the final screen before you hit share, there's a toggle to also post to Facebook. Turn it on and it stays on for future posts until you turn it off.
Cheap, quick, no extra software. It works for Stories and Reels too, though those are separate toggles you'll need to find individually.
The catch is that everything flows one way — Instagram to Facebook — and the Facebook version is essentially a copy. Which is fine right up until it isn't. More on that shortly.
Option two: post to both from Meta Business Suite
Meta Business Suite is free, works in a browser or as an app, and lets you write one post, tick both Facebook and Instagram, and publish or schedule it in one go.
Its real advantage over the toggle is the preview. You see how the post will look on each platform before it goes out, side by side, which catches the cropping problems and the awkward line breaks before your customers do. You can also schedule weeks ahead and edit the caption for one platform without touching the other.
If you only take one thing from this article: use Business Suite rather than the Instagram toggle. Same effort, considerably more control.
Option three: a tool that handles the writing too
Scheduling tools connect to both platforms through Meta's official API and push your post to each. Most also cover X and LinkedIn, so you're not limited to the Meta family.
The distinction worth understanding is that scheduling tools solve the *posting* problem, not the *what do I post* problem. If your bottleneck is that you never got round to opening Facebook, a scheduler fixes it. If your bottleneck is staring at an empty box on a Tuesday night with no idea what to say, a scheduler just gives you a nicer empty box to stare at.
That's the gap we built Aunty Social to fill — it learns your business from your website, writes the posts, and sends them to Facebook, Instagram and X for £29 a month. Whether that's the right tool for you depends entirely on which of the two problems you actually have.
Where cross-posting quietly lets you down
Identical content on both platforms mostly works. The exceptions are worth knowing, because each one makes you look slightly careless.
Links don't work on Instagram. A URL in a Facebook caption is clickable. The same URL in an Instagram caption is dead text that nobody can copy easily. If your post's whole purpose is sending people somewhere, the Instagram version needs different wording — "link in bio", or just tell people to ring you.
Hashtags read differently. Eight hashtags at the bottom of an Instagram caption look normal. The same eight on Facebook look like someone's automated it and not bothered checking.
Image shape matters. Landscape photos get squeezed awkwardly into Instagram's feed. Square or portrait images work on both. If you're only going to shoot one photo, shoot it square-ish and leave room around the edges.
Instagram cuts your caption off early. Around 125 characters in, everything else hides behind "more". Facebook shows considerably more before truncating. Front-load the point of the post and you're covered on both.
Tagging doesn't carry across. Tag another business's Instagram account and the Facebook copy will show the raw handle rather than a working link to their Page.
The two-minute habit that fixes most of it
Write the post once, aimed at whichever platform matters most to your business. Then, before scheduling, look at the other preview and change one thing — swap the link for "link in bio", trim the hashtags, tighten the opening line.
That's it. Not two posts. One post and a small adjustment, which is about ninety seconds of work and the difference between looking automated and looking like you meant it.
Because the goal was never really to post in two places at once. It's to stop the second platform being the one that silently gets abandoned.