Type in the composer at the bottom of a channel or conversation. Enter sends, Shift + Enter adds a line (you can change this in User Settings → Messages & Media → Input).
Limits
| Free | Plutonium | |
|---|---|---|
| Message length | 2,000 characters | 4,000 |
| Attachments per message | 3 | 10 |
| File size | 25 MB | 500 MB |
| Daily upload quota | 200 MB | 10 GB |
| Voice messages | 60 seconds | 10 minutes |
| Pins per channel | 10 | 50 |
| Scheduled messages | 3 | 50 |
Edit and delete
- Hover your own message → Edit, or press Up Arrow on your latest message.
- Delete removes the text for everyone. Attachments on that message are deleted too.
- Need a copy first? Export your data or download the files: Exporting your account data, How attachment expiry works on Astral.
To delete every message you ever sent, use the Privacy Dashboard. The request is queued and starts after 24 hours; you can cancel it. See Requesting data deletion.
Voice notes and quick edit
- The composer can record a voice note: 1 second to 60 seconds free, or 10 minutes with Plutonium.
- To edit your last message, send
s/old/newors/old/new/g.
Pins and scheduled messages
- Pinning needs permission to pin messages. Free channels cap at 10 pins; Plutonium at 50. Open the list from the header (
Ctrl/Cmd+P). - Scheduled send: right-click Send, pick a time (about one minute ahead, max 30 days). Free accounts can keep 3 scheduled messages; Plutonium can keep 50. Manage them in Inbox → Scheduled.
Formatting: Message formatting and Markdown. Replies and reactions: Replies, reactions, forwards, and mentions.