On a free Slack workspace, files that vanish at the 90-day mark are normally hidden, not deleted — and upgrading brings them back. But there is one workspace setting that turns that hiding into real deletion, and when it is on, no upgrade will recover anything.
Most write-ups stop at "free Slack only keeps 90 days." That framing costs people money: some upgrade expecting a restore that never comes, others abandon content that was recoverable all along.
What actually happens at 90 days
Slack's description of the visibility limit, word for word:
"You can view and search messages and files from the last 90 days. Files include things like clips, PDFs, documents, images, screenshots, and audio and video files. When your workspace reaches the visibility limit, Slack will start hiding messages and files older than 90 days to make room for new ones. Messages and files more than one year old will be permanently deleted."
Two things there matter more than the number 90.
The verb is "hiding." Slack does not say old files are removed — it says they stop being viewable and searchable.
There is a trigger condition. Hiding starts "when your workspace reaches the visibility limit," framed as making room for new content.
The one-year rule is a second, entirely separate mechanism. Slack's plan comparison footnote states it plainly: "Messages and files on the Free plan will only be stored for one year. Any content in your workspace more than a year old will be permanently deleted."
| Age of the file | What Slack does | Recoverable? |
|---|---|---|
| Under 90 days | Viewable and searchable | Yes — it is right there |
| Older than 90 days | Hidden once the workspace reaches the visibility limit | Yes, by upgrading — see below |
| More than one year old | Permanently deleted | No |
Slack is specific about what an upgrade gets you: "If you choose to remain on a free workspace, you'll have full access to the past 90 days of message and file history, and the remaining 275 days will become available should you upgrade to a paid plan."
Ninety plus 275 is one year. That is the whole model: a window you can see, 275 days parked behind the paywall, and a one-year cliff beyond which nothing survives.
Slack also dates the cliff's rolling enforcement: "Starting August 26, 2024, Customer Data — such as messages and file history — older than one year may be deleted on a rolling basis from workspaces on the free plan, following the terms described in the Main Services Agreement and Trust and Compliance Documentation."
The setting that turns "hidden" into "deleted"
This is the part almost nobody writes down, from the data retention section of the same page:
"Workspace Owners can use basic data retention settings: either keep all messages and files for one year, or delete them after 90 days. If you choose to delete messages and files after 90 days, this will automatically delete any that become hidden by the message and file limit."
Read the second sentence slowly: the workspace's own retention choice and Slack's visibility limit are not independent. If an owner selected delete after 90 days, everything the visibility limit hides is deleted automatically — the 275-day reserve never exists, because that content was destroyed as it crossed the line instead of being parked behind the paywall.
And deletion is final. Slack's FAQ on the history changes says so directly: "It will not be possible to restore messages and files once deletion occurs." So "will upgrading bring my files back?" has two different correct answers, decided by a setting most members of a workspace have never seen.
The fastest fix: ask which retention setting is on, before you pay
In order:
- Find a Workspace Owner and ask which of the two basic retention settings is in effect — keep everything for one year, or delete after 90 days. Nothing else you do is informed until you know this.
- If it is "keep all messages and files for one year": upgrading to a paid plan is a real fix. Slack says the remaining 275 days become available on upgrade.
- If it is "delete them after 90 days": stop. The hidden content was deleted on the way out and Slack states restoration is not possible. Upgrading buys you nothing retroactively — though changing the setting protects everything from here forward.
- Either way, check the age. Anything more than one year old is described as permanently deleted regardless of the setting and regardless of what you upgrade to.
Get your files out while you can still see them
If step 1 turned up bad news, the only move left is making sure it does not happen twice. Three Slack behaviours make that harder than it sounds:
- Download from desktop, not your phone. Slack is explicit: "If you'd like to save files added to Slack to your desktop, you can download them. On your mobile device, you can only download image files." A colleague's video cannot be archived from the mobile app.
- Sharing links out is a paid feature. "If your workspace is on a paid plan, you can create links to share files outside of Slack." On free, the file has to come down to a disk.
- Clips are not a special case. "Clips follow the same retention policy as other files in Slack" — everything recorded inside Slack is on the same clock as everything uploaded to it.
The practical problem with a bulk archive is size. Screen recordings and phone video are the bulkiest things in any workspace, and an uncompressed year of them fits nowhere convenient. Shrinking them on the way down makes the archive something you will actually keep — and if you re-upload the important ones to a paid workspace later, smaller files stay well inside Slack's stated ceiling of 1GB per file.
Try it right here
Runs in your browser. Your file is not uploaded anywhere.
This runs in your browser tab: the video is read from disk, re-encoded locally, and handed back, with nothing uploaded to a server — which matters when what you are rescuing is internal work material. To tune settings instead of taking the preset, compress video exposes the same engine with the controls visible.
Other reasons Slack files go missing
Other things that look like the 90-day limit:
The workspace hit a storage ceiling, not a time limit. Slack's developer docs list a storage_limit_reached error for the upload API: "File storage limit has been reached. This occurs when free teams have uploaded 5GB of files." Two caveats: that is a whole-workspace total, not a per-file cap, and the source is a developer error-code reference plus a March 2019 changelog, not a current user-facing help page. That changelog describes files beyond the limit being tombstoned in the API with "mode": "hidden_by_limit" — hiding vocabulary again, not deletion.
The workspace was downgraded from a paid plan. Slack spells this out for canvases: "When you downgrade, your canvases become read only and subject to the 90-day limit. After a year, all canvas content will be deleted." Lists behave differently again — Slack says they are not visible on a free plan but are stored for a possible upgrade, with the same one-year deletion.
Someone deleted it by hand. Slack notes that "Files must be deleted individually, but we offer API methods to help you manage files in your workspace or Enterprise organization."
The file never uploaded at all. If the "missing" file is recent, check that it arrived: "Files you add to Slack will be scanned for viruses and other malware, and won't be uploaded if any are detected." Uploads can also be restricted in Slack Connect conversations.
If recent uploads are failing rather than old ones vanishing, that is an upload problem rather than retention: see Discord says your file is too large and WhatsApp video too large to send for how upload caps behave, or the rest of the fix guides.
FAQ
Are Slack files gone forever after 90 days? Usually not. Slack describes the 90-day behaviour as hiding files older than 90 days once the workspace reaches the visibility limit; permanent deletion is the separate one-year rule. The exception is a workspace set to delete after 90 days, where the hidden content is deleted automatically.
Will upgrading to a paid plan bring back my hidden Slack files? If the workspace keeps everything for one year, yes: Slack says the remaining 275 days become available on upgrade. If it is set to delete after 90 days, no — that content was deleted as it was hidden, and Slack states restoration is not possible once deletion occurs.
I upgraded and my files still are not there. Why? Either the missing content is more than one year old, which Slack describes as permanently deleted, or the workspace was on the delete-after-90-days retention setting. Ask a Workspace Owner which setting was in effect while the files were aging out.
Can I recover deleted Slack files from the free plan? Slack's answer is no: "It will not be possible to restore messages and files once deletion occurs." Treat anything past the one-year mark, or caught by a delete-after-90-days setting, as unrecoverable and protect what is still visible.
How do I back up Slack files before the limit hits them? Download them from the desktop app — Slack says only image files can be downloaded on mobile — inside the 90-day window, while they are still viewable and searchable. Compressing video as you go keeps the archive to a size you will actually retain. More browser-based tools: all Clapr tools.
Do audio and video clips recorded in Slack follow the same rule? Yes. Slack states that clips follow the same retention policy as other files, and the usage-limits page names clips among the file types covered by the 90-day visibility limit.
Cited from Slack's help centre pages on free-workspace usage limits, message and file history updates, and adding files to Slack, checked 16 September 2026. Verify against the official documentation before relying on these policies.
