If you're active on multiple social media platforms, you know the pain: write a post, publish it on X, copy it to Threads, reformat it for LinkedIn, paste it into Bluesky, then do the same for Mastodon.
That's 15-20 minutes per post. For something you could do in one click.
Cross-posting means publishing the same (or similar) content across multiple social media platforms simultaneously. Instead of manually posting to each platform one by one, you use a tool that handles all platforms at once.
The biggest complication with cross-posting is that every platform has different character limits:
| Platform | Character Limit |
|---|---|
| X/Twitter | 280 (Premium: 25,000) |
| Bluesky | 300 |
| Threads | 500 |
| Mastodon | 500 (instance-configurable) |
| 3,000 |
If you write a 250-character post, it fits everywhere. But if you write a 400-character post for Threads, it won't fit on X or Bluesky without editing.
Good cross-posting tools handle this automatically, either by truncating, warning you, or letting you customize per platform.
Connect all the platforms you want to post to:
The free plan supports 3 channels. Creator plan supports 8.
Click Create Post and select all the platforms you want to publish to. Shaflex shows you:
Click Publish to post to all selected platforms immediately, or Schedule to pick a specific date and time. For tips on choosing the right time, see our guide on mastering social media scheduling.
That's it. One post, all platforms, one click.
If you're posting to X (280 chars) and LinkedIn (3,000 chars), write the core message within 280 characters first. You can always expand for platforms with higher limits later.
Some content is platform-specific. A LinkedIn thought leadership post might not work on Bluesky. A quick X hot take might not fit LinkedIn's professional tone. Use cross-posting for announcements, updates, and content that works everywhere.
If you have more to say than 280 characters, write a thread. Shaflex supports threaded posts on X, Threads, LinkedIn, Bluesky, and Mastodon. Write once, publish as a thread across all platforms.
Cross-posting saves time on publishing, but you still need to engage with replies and comments on each platform. Shaflex lets you view and reply to comments across platforms from one dashboard.
Different platforms have different media limits:
| Platform | Max Images | Max Video | Max File Size |
|---|---|---|---|
| X/Twitter | 4 | 2m 20s | Varies |
| Bluesky | 4 | N/A | 10 MB |
| Threads | 10 | Yes | Varies |
| Mastodon | 4 | Yes | 40 MB |
| 9 | Yes | 5 MB/image |
Shaflex warns you if your media doesn't meet a platform's requirements before you publish.
| Tool | Platforms | Cross-Post | Free Plan |
|---|---|---|---|
| Shaflex | X, Threads, Bluesky, Mastodon, LinkedIn | Yes | 3 channels |
| Buffer | X, Threads, Bluesky, LinkedIn, + more | Yes | 3 channels |
| Later | X, Threads, LinkedIn, + more | Yes | Limited |
| Publer | X, Threads, Bluesky, Mastodon, Telegram, + more | Yes | 3 channels |
| Hootsuite | X, Threads, LinkedIn, + more | Yes | No free plan |
Shaflex and Publer are the only tools that support cross-posting to Bluesky, Mastodon, and Threads simultaneously.
Cross-posting saves hours every week. Instead of manually posting to 5 platforms, you write once and publish everywhere. The key is choosing a tool that supports all your platforms and handles character limits automatically. Learn more about cross-platform social scheduling with Shaflex.
Shaflex supports cross-posting to X, Threads, Bluesky, Mastodon, and LinkedIn from one composer. Try it free. No credit card required.
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