Schedule posts to Slack: limits, media rules and setup
Slack is a messaging channel. Publaro publishes there directly, with 40,000 characters per post and the platform's own media rules checked for you.
Publaro publishes to Slack directly
Posts go to Slack through its official API, at the time you schedule them. If Slack does not answer after a post was sent, Publaro marks it "check needed" instead of sending it again, so a post never goes out twice.
Slack limits and media rules
These are the rules Publaro checks while you write, so a post is not rejected after you have scheduled it.
| Text limit | 40,000 characters |
|---|---|
| Threads (a post split into parts) | No |
| Images per post | 10 |
| Videos per post | 10 |
| Image file | JPG, PNG, GIF, and WEBP, up to 1 GB |
| Video file | MP4, MOV, and WEBM, up to 1,440 minutes and 1 GB |
| Media required | No: text alone is enough |
| Image descriptions (alt text) | Supported |
Connect Slack by signing in
You sign in to Slack and approve Publaro. Your Slack password is never shared with Publaro, and you can revoke access from Slack at any time. Agencies can also send clients a private connect link, so they connect their own accounts.
What Publaro checks before a post goes to Slack
- The text length, counted the way Slack counts it
- That any media you add fits Slack's file types and sizes
- That images carry a description for people who cannot see them
- That the post is not a copy of the same text on another platform
- That nothing in it breaks your brand rules, such as banned words
Questions about Slack
Can I schedule posts to Slack with Publaro?
Yes. Write the post once, choose a time, and Publaro publishes it to Slack for you. You can schedule a single post, fill the next free slot in your posting schedule, or import many at once from a CSV file.
What is the Slack character limit?
Slack allows 40,000 characters in a post. Publaro counts them the way Slack does and warns you while you type, so a post is never rejected for length at the last moment.
How do I connect Slack to Publaro?
You sign in to Slack and approve Publaro. Your Slack password is never shared with Publaro, and you can revoke access from Slack at any time. Agencies can also send clients a private connect link, so they connect their own accounts.
Can I post only text to Slack?
Yes. Slack accepts a post with text alone, and you can add up to 10 images or 10 videos.
Schedule your Slack posts with Publaro
The Free plan connects 3 accounts, has no time limit and needs no credit card.