Slack free plan message history: 90 days you can see, one year before it is deleted

Slack free plan message history has two separate limits, and only one of them is reversible. You can read and search the past 90 days. The 275 days behind that are stored but hidden, and an upgrade brings them back. Anything older than one year is deleted permanently, and no upgrade restores it.

That distinction decides what you should do this week: check one retention setting, run an export, and only then argue about plans. We read Slack's help center on October 23, 2026 for every figure below. Plan limits change, so check the pages we link before you act on them.

Slack free plan message history: 90 days visible, 275 days hidden

Slack's documentation splits the free limit in two. The first part is visibility: on a free workspace you'll have full access to the past 90 days of message and file history, and to see anything older, "you'll need to upgrade your workspace." The second part is what still exists behind that wall - Slack says the remaining 275 days will become available should you upgrade to a paid subscription.

Add the two together and a free workspace holds about a year of history while showing you three months of it. In our reading of what currently ranks for this query, that is the distinction most often blurred. Messages are not destroyed the moment they pass 90 days, and upgrading really does bring them back - up to the one-year mark.

Does Slack delete messages older than one year?

Yes, and this is the limit an upgrade cannot undo. Slack dates the start of the policy to August 26, 2024, when it began deleting customer data such as messages and file history older than one year on a rolling basis from workspaces on the free subscription. The same page is blunt about recovery: "It will not be possible to restore messages and files once deletion occurs."

It covers more than messages. Canvases on a downgraded workspace "become read only and subject to the 90-day limit," and for Slack lists, "after a year, list content is deleted and will not be restored if you upgrade."

One exception is worth knowing if you work with large customers. Slack says that if you work in Slack Connect channels with an Enterprise organization, messages and files in those channels will not be deleted when a one-year retention policy is set.

One setting decides whether your year is really a year

Free workspaces get a choice between two retention settings, and the shorter one deletes hidden history instead of holding it. Slack's retention documentation lists the free options as keeping messages without tracking edits or deletions, which keeps them for one year, or "Delete messages after 90 days." Files have the same pair, as do canvases and lists.

If the 90-day option is selected, Slack's usage-limits page says the setting will automatically delete any that become hidden by the message and file limit. In other words, your 275-day buffer does not exist and an upgrade restores nothing. Slack's help pages describe no warning to admins before those deletions run. Deletions "run once per day," and "data deleted according to your retention setting is permanent."

Slack's help pages do not state which option a free workspace gets by default, so the only safe move is to look. A workspace owner can check it from the desktop app under Admin, then Workspace settings, then the Data retention section. In our view, that is the first thing to do on any free workspace you care about - before comparing plans, and before you let a trial lapse back to free.

How to export Slack messages on the free plan

The free export covers less than its name suggests, so run it knowing what it leaves out. Slack says workspace owners and admins can export messages and file links from public channels in JSON format. Private channels and direct messages are not part of it; owners must apply to Slack, which rejects applications unless they can show valid legal process, member consent, or a legal right or requirement.

The export also hands you links rather than the files. Slack states that workspaces on the Free subscription can only export links to files from the last 90 days. We would treat those links as perishable and download anything that matters while the file still exists in the workspace.

To run one: open Tools & settings, then Workspace settings, then Import/Export Data, then the Export tab. Slack emails you when the archive is ready.

Who has to act, and who can ignore this

• Free workspace more than a year old. You are already inside the rolling deletion. Check the retention setting, export today, and decide after that.
• Free workspace less than a year old. Nothing has been deleted yet. Set retention to the one-year option if it is not already there, and put a recurring export in the calendar.
• Already on a paid plan. This does not apply to you. Slack keeps paid-subscription data for the lifetime of the workspace by default.
• Thinking of downgrading to save money. Read the downgrade list first. Slack says a downgraded workspace is limited to 10 third-party or custom app installations, gets one-on-one huddles only, loses Slack Connect channels because they "will disconnect," sees existing workflows "stop working," and has guest accounts deactivated.

That last group is the one we would slow down. A downgrade that saves a few seats can quietly start a one-year clock on everything written before it, which is a different kind of cost. It is the same trap as the Google Sheets cell limit, where the headline number is not the thing that breaks first.

Slack alternatives with unlimited message history

If the answer is to move rather than to pay, the only free-plan feature that matters here is retention. Upfynd lists 171 products in Messaging & Chat and 212 in Remote & Collaboration as of October 2026. We checked these three today.

Pumble's pricing page, read October 23, 2026, puts unlimited message history and an unlimited number of users on its free plan, with 10 GB of storage per workspace. Mattermost, which we list as an open source, self-hosted Slack alternative, is the usual suggestion for keeping history on your own hardware, but we could not confirm a free-plan retention term for it today. Its pricing page lists Professional, Enterprise and Enterprise Advanced with no published prices and mentions a free edition only in passing, so check what that edition covers before you plan around it.

In our view, migrating team chat is a bigger project than most teams budget for, and we would not start one to save three months of searchable history. We would start it only if a year of retention is genuinely too short for how your team works. Either way, export first: that decision is easier to make when the archive is already on your own disk.