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Note: Deleted messages and files do not count towards these limits.
Message visibility limit
Members can send unlimited messages in Slack, but only the most recent 10,000 will be searchable and viewable in your workspace.
If your workspace exceeds the message visibility limit, that's okay! Members can continue to send messages, but older messages will be archived. If you upgrade your workspace to a paid plan, all archived messages will become available again.
What counts as a message
Anything typed into the message field and sent counts as a message. A one-word message (or even a single emoji) is counted the same as a 500 word multi-paragraph message.
Links, snippets, posts, uploaded files, replies in a thread, messages in archived channels, and messages from bot users all count towards your workspace's total number of messages sent.
File storage limit
On the Free plan, workspaces have up to 5GB of file storage available. Anything uploaded to a channel or a direct message, e.g. PDFs, documents, images, screenshots, audio and video files, counts towardsthis limit.
If your workspace reaches the limit, members can continue to upload files, but Slack will start archiving the oldest files to make room for new ones. Members won't be able to view archived files in channels, direct messages, or search results.
Like messages, archived files will immediately become available again if you upgrade to a paid plan. After upgrading, file storage limits are determined by the total number of members (including Multi-Channel Guests) in your workspace:
Standard plan — 10GB per member
Plus plan — 20GB per member
Note: Files shared via apps (like Google Drive, Dropbox, etc.) do not count towards the file storage limit.
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