Cross-Post Checker
Paste one caption and see where it runs over the limit on each platform.
- Rejects text-only posts — this one needs an image or video
The description is plain text; the destination URL is a separate field on the Pin.
- Rejects text-only posts — this one needs an image or video
Traffic has to go through the bio link or a story sticker — there is no clickable link anywhere in a feed caption.
- Rejects text-only posts — this one needs an image or video
Captions are not clickable. Traffic has to go through the bio link, and the post needs a video, not an image.
- Rejects text-only posts — this one needs an image or video
The first line becomes the video title (100 characters max). Links are clickable in the description, which starts on the second line.
Every URL counts as 23 characters no matter how long it is, because X rewrites it through t.co.
Links are only clickable if the posting tool attaches link facets. Some tools skip that and the URL renders as dead text.
500 characters is the common default, but each server sets its own — some allow far more.
Put the hook in the first two lines — that is all anyone sees before they have to choose to expand.
The character limit is generous, but each subreddit’s own rules on self-promotion are the real constraint.
Limits come from the same table seenpaid’s publisher enforces, so they do not drift from what actually posts. Nothing you type leaves your browser.
About this tool
Every platform has its own character limit, some reject text-only posts, and some never make a link clickable. Paste a caption to see the count against each limit, which platforms would refuse the post, and where the feed cuts it off. Nothing leaves your browser. The limits are the table seenpaid’s publisher checks before it posts.
Embed this tool
Free to put on your own site. The snippet includes a small link back to this page — please keep it, that link is the price.
<iframe src="https://seenpaid.com/embed/cross-post-checker"
title="Cross-Post Checker by seenpaid" loading="lazy"
width="100%" height="720"
style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px"></iframe>
<p style="font-size:13px"><a href="https://seenpaid.com/tools/cross-post-checker?utm_source=embed&utm_medium=widget&utm_campaign=cross-post-checker">Cross-Post Checker</a> by seenpaid</p>Related tools
Social Media Post Preview
See how your caption and images will look on each platform before you post.
Social Posting API Checker
Compare what each platform’s posting API supports: auth, token refresh, media and limits.
Social Media Image Sizes
Image, video, profile and header sizes for each platform, with the source for every number.
Read more
- How to post to social media from Claude, ChatGPT or any AI agentClaude and ChatGPT can write a post but can't click Post. Every way to make them publish: scheduler MCP servers, Zapier and n8n, or the platform APIs.11 min read
- How to adapt one post for every platform in 5 minutesPosting identical text everywhere underperforms, and writing six originals is not sustainable. Here is the quick-tweak method in between.8 min read
- How to cross-post everywhere without losing your mindA practical system for publishing to many social networks at once: what to adapt, what to copy, how to batch, and how to catch the posts that silently fail.8 min read
- Post once, reach every audience — without the busyworkPublishing the same idea to more networks multiplies reach at no creative cost. Why most people quit, and how to keep the reach without the busywork.8 min read
seenpaid is a social media scheduler for 21 platforms that your AI agent can drive. These tools came out of building it, and they stay free.