Connect X to LinkedIn

Before you start

• An X account. Any account you can sign in to works.
• A LinkedIn account. Post Once posts to your personal profile, not a company Page.
• A Post Once account. The free plan includes 10 reposts, with no card needed.

How to connect X to LinkedIn

1. Create a free account at app.postonce.com. After two short intro screens, Post Once asks where you post.

2. Under Where do you post first?, pick X and press Continue.

   

3. Under Where else should it land?, pick LinkedIn. Add any other apps, or a backup, then press Continue.

4. On Connect your accounts., press Connect on the X row. Sign in on X’s page and authorize Post Once.

   

5. Press Connect on the LinkedIn row. Sign in with LinkedIn and allow access.

6. When both rows say Connected, press Go to dashboard.

From then on, keep posting on X as usual. Post Once checks it about every minute and reposts each new post to LinkedIn.

Already using Post Once?

If X is already the source of your bridge, open Bridge and press Connect next to LinkedIn in the Destinations card, or press Add destination on the dashboard.

If your bridge reads from another account, add a second bridge with X as its source from the bridge switcher. Free and Solo include 1 bridge, Studio 3 and Agency as many as you need. See bridges.

What each X post becomes on LinkedIn

On X	On LinkedIn
A video up to 3 minutes, vertical or square (the first one, if a post has several)	A video post.
A video over 3 minutes, or a landscape one	A video post, up to 30 minutes and 500 MB. Longer videos skip LinkedIn.
A photo	A photo post.
A post with several photos	A swipeable PDF post, one page per photo, titled with the first line of your caption. Pick Photo grid to post up to 20 photos in a grid instead.
A text post	A text post, up to 3,000 characters.

A skipped post shows the reason on your dashboard and still goes to your other destinations. See long videos for how Post Once tells short from long.

How your caption carries over

The post text goes with each repost, and each t.co link is turned back into the full address. Replies, reposts of other people’s posts, quotes with no video or photo, polls and GIFs are not reposted.

LinkedIn takes captions up to 3,000 characters, and hashtags in them become LinkedIn hashtags. Posts are public, on your personal profile.

Choose what goes to LinkedIn

On the Bridge page, the LinkedIn row has three settings.

• What to post has a switch for Videos, Photos and Text posts. Switch a kind off and those posts skip LinkedIn, though you can still send one there by hand. Switching every kind off pauses LinkedIn.
• Carousels sits under Photos and decides how a post with two or more photos goes to LinkedIn: Swipeable PDF, the default, which people swipe through like a carousel, or Photo grid. It shows while Photos is on.
• Rewrite caption changes the caption for LinkedIn only: Remove comment, DM and link in bio prompts, Remove hashtags and mentions, Rewrite with AI to suit LinkedIn, and Add your own text at the start or end. Each one is off until you turn it on.

Check that it works

Post something on X as usual. Within a minute or two it shows up under Your posts on the dashboard, then goes to LinkedIn. Each post shows where it went, what was skipped and why.

If a repost fails, Post Once tries again up to 5 times over about half an hour. If it still fails, you get an email, and Retry sends it again to just the accounts it missed. See a post did not repost.

Only posts published after you connect are reposted on their own. Older ones are listed in Your posts, where you can send any of them by hand.