Slack Free Plan Limits: What Happens After 90 Days and One Year?

Someone always tells you the fix is simple. Worried about losing your Slack history on the free plan? Just upgrade. I nodded along to that for a good while — then I actually went to do it, and found the upgrade wasn't mine to buy.

On Slack's free plan, messages and files older than 90 days get hidden from you, and anything past one year can be deleted for good. Upgrading would reveal the hidden-but-not-yet-deleted part. But one person can't upgrade one account — you pay for the whole workspace or nobody does. Which turns out to be the entire reason a personal copy is worth keeping.

Quick answer

• Messages and files older than 90 days get hidden on the free plan — you can't read or search them.
• Content older than one year can be permanently deleted, on a rolling basis.
• There is no personal Slack plan — upgrading bills the whole workspace at $7.25 per active user per month (billed annually, per Slack's pricing page).
• Often you can't upgrade at all: billing is usually limited to the workspace owner, not members or admins.
• Nothing brings back what Slack has already permanently deleted — no upgrade, no tool, mine included.
• To keep your history, archive it to your own computer while it's still there — that's the part actually yours to control.

so what actually happens at day 90?

Nothing dramatic happens on the surface. Your old messages don't vanish in a puff on the morning of day 91 — they just quietly stop showing up, a little more sliding out of reach each day, until you go hunting for something specific and find it's already gone.

Slack's free plan gives you a rolling 90-day window. Anything past that edge — messages, threads, uploaded files — drops out of your channels, your DMs, and your search results. It's still sitting on Slack's servers for now; per Slack's own feature-limitations help pages, this is the free plan working as designed, not a bug. The history isn't gone. It's behind a wall that moves forward one day at a time.

a second clock you didn't know was running

Most people stop at "hidden" and figure that's the whole story. It isn't.

Slack's data-retention documentation describes a further step: content that ages past one year can be permanently deleted on a rolling basis. The 90-day wall hides your history; the one-year mark is when some of that hidden history can actually be erased — two clocks, not one. The exact mechanics are Slack's to define, so check Slack's current help pages for precise wording — as of 2026-08, this is how it reads.

are those hidden messages already gone?

Not necessarily — and that gap is why timing decides everything.

Picture two zones. A message between 90 days and one year old is usually hidden but still there. You can't see it, but Slack likely still holds it — it could come back. A message that's aged past the deletion window may be hidden and gone for keeps.

The maddening part is that Slack hands you no label telling you which zone a given message is in. From your seat on the free plan, both zones look identically absent. So "I'll sort it out later" is a gamble — by later, some of it may have crossed from recoverable to erased.

why can't you just upgrade?

Because for most people on a free workspace, upgrading isn't a personal choice at all. It's a company purchase.

Start with the sticker price: Slack Pro runs $7.25 per active user per month, billed annually — roughly $87 a year for one seat, per Slack's pricing page. For one person, that's nothing. But there's a catch — there's no one-person plan. Slack's Fair Billing Policy charges for every active member of the workspace, and the smallest thing you can actually buy is the whole workspace. You don't upgrade yourself; you upgrade everybody.

So the real bill isn't $87. On a 30-person workspace it's closer to $2,600 a year — every active teammate, whether they care about a two-year-old DM or not.

And even that assumes you're allowed to press the button — often you're not. Workspace owners can lock billing down so only owners can upgrade, and admins can't even open the billing settings. For a regular member who just wants their own history back, upgrading isn't a tough decision. It isn't their decision at all.

If the workspace stays on Free — because nobody's keen to buy thirty seats to rescue your DMs — there's nothing you can do about that 90-day wall from inside Slack. And if someone does upgrade, it comes with an asterisk: it reveals the hidden-but-not-deleted history, not the part already gone. An upgrade rescues what's currently hidden, not a time machine.

can you recover messages Slack already deleted?

No. Once Slack permanently deletes something, it's gone, and no upgrade, export, or third-party tool brings it back.

I'd rather say that flat out than let you hope otherwise, and yes, that includes any backup app — mine too. A backup tool only copies what your account can currently open, reading your live history the way the Slack app does and writing it to disk. If a message is already deleted, there's nothing left to read, so nothing to save.

That's the hard ceiling on every tool in this corner. The whole trick is doing it before the window shuts.

backing up your own copy — no admin, just you

There's a question the upgrade path never answers, though. What if you don't want to wait on a company to buy thirty seats — you just want your own history, kept safe, by you?

That's the exact niche a personal backup fills. Empowia for Slack is a Windows 10 and 11 app that copies whatever you can reach — public and private channels, DMs, group DMs, and attachments — straight to your own computer.

It reuses the Slack session you're already signed into, so there's no admin to ask, no app to register, no API tokens to paste. Nothing leaves for a cloud. It's free for up to 20 conversations, with a one-time purchase to lift the cap.

The two costs are shaped nothing alike. Slack is recurring, per-user, whole-workspace, usually the owner's call to make. Empowia is a one-time payment — about what you'd drop on a few coffees, around €19.90 to lift the cap — and it's just you. Buy it once and the copy is yours, whatever the company's plan does next month.

Not sure what to grab first? Go for what you can't recreate — decisions nobody wrote down, a file a client sent once, the DM where someone agreed to a deadline. Public channels are the least of your worries; the official export reaches those. It's the private threads and one-to-one conversations, visible only to you, that a local copy needs to pull off the wall while it still can.

the official export and a personal archive, side by side

The other free route is Slack's own export. It's real, and worth knowing, but narrow — so lay the two next to each other, and the real questions are what each one covers and who's even allowed to run it.

	Slack official export (free plan)	Personal local archive (Empowia)
Who can run it	Owner or admin only	Any member, for their own access
Covers private channels & DMs	No	Yes — whatever you can see
Setup	Admin console, tokens/scopes	One click, reuses your session
Output	Raw JSON	Searchable archive on your PC
Cost shape	Free, but admin-gated	One-time; free up to 20 conversations
Recovers already-deleted messages	No	No

If you're the admin and you just need a one-off dump of public channels, the official export does that job fine. If you want your private conversations too, kept searchable and under your own control, a local archive fits closer.

Whichever you use, the move is the same — do it while the messages are still on your side of the 90-day wall. Back up the history you can still reach before it drifts into Slack's deletion window. That link I went looking for at the start? I never did learn whether it was hidden or already gone. I just know I stopped waiting on a plan I couldn't buy, and started keeping my own copy.