Does downgrading to a free plan delete my data?

Usually not on the day it happens, and that is what makes it easy to misjudge. Most vendors hide or freeze what the free tier does not cover. Trello's help page says boards beyond the free limit are "closed, but not deleted" and that data from paid features is "hidden, but not deleted". But some parts do get deleted. Zoom's troubleshooting article says cloud recordings on an account downgraded to free "are set to be deleted after 30 days". Slack deletes free-workspace messages and files more than one year old. Airtable removes snapshots older than two weeks, and they "can't be recovered, even if you upgrade later" (all checked 19 September 2026).

Can I upgrade again and get everything back?

Only the parts that were hidden or frozen. Slack shows the older messages again on upgrade if they have not reached the one-year deletion yet. Notion automations turn editable again. But the history window itself does not come back. Airtable's downgrade article says expired snapshots stay gone after an upgrade, and Zoom says you have to resubscribe inside the 30-day window. Anything past its deletion date is gone, so check the dates before you downgrade.

Why won't Mailchimp let me downgrade to Free?

Two rules from Mailchimp's own help pages. First, you can go from a paid plan to Free "only once over the life of your account". Second, the account has to fit the Free plan first, which Mailchimp says could mean "deleting contacts, seats, or audiences". Free allows 250 contacts, one audience and one seat. Unsubscribed contacts count toward that 250, but archived contacts do not. Archiving is the route that keeps the records (checked 19 September 2026).

When does a downgrade take effect?

On most self-serve plans, at the end of the current billing period. Airtable, Trello and Mailchimp describe it that way, and Notion shows the date your current plan ends when you confirm. Slack gives you the choice: the change can happen immediately or on your next renewal date. Slack's instructions for switching to Free say nothing about a refund or credit for unused time. The credit it does mention, for a downgrade from Business+ to Pro, is paid in Slack credits, which Slack says expire when the paid plan ends.

Downgrade to Free Plan: Read-Only, Hidden or Deleted

"Snapshots that fall outside the downgraded plan's retention window are removed and can't be recovered, even if you upgrade later."

That sentence is in Airtable's help article on changing workspace plans. It sits under a heading about revision history, well below the part most people read, which says your bases, tables and records stay where they are. Both statements are true. Nothing you typed in is deleted. But you lose the undo history for everything more than two weeks old, and upgrading again does not bring it back.

Free tiers get suggested all the time as a place to park a system you are leaving. Stop paying, keep the data readable, look things up for a year. Sometimes that works. Often it does something quieter: the data stays, but you can no longer see, edit or restore part of it. Vendors document this, but in the downgrade article, not on the pricing page. And every vendor words it differently, so it is hard to compare them.

This page sorts those rules into three piles, then goes through six vendors' own downgrade documentation, as it read on 19 September 2026. It does not say which product to use. It lists what happens at the free-tier line and what to capture before you cross it.

Three things a downgrade can do, and only two of them wait for you

Every downgrade rule examined here falls into one of three kinds. The kind tells you how urgent it is.

Frozen. The data is visible and you can open it, but you cannot change it. Trello boards over the collaborator limit, Slack canvases, Notion automations, Airtable bases over the record cap. Frozen data is still there. You can usually read it, often export it, and upgrading unfreezes it.

Hidden. The data still exists on the vendor's side but the interface will not show it. Trello calls this "hidden, but not deleted". Slack's message history past 90 days is hidden too, until it reaches its deletion date. Hidden data comes back if you upgrade, provided it still exists by then. That condition is what separates this pile from the next.

Deleted on a clock. The downgrade starts a timer, or moves you under one that is already running, and when it runs out the data is gone for good. Zoom cloud recordings. Slack content older than a year. Airtable snapshots and Notion version history past the new, shorter window.

The first two piles wait for you. The third does not, and a downgrade is often what starts it. Most downgrade decisions go wrong because the whole move gets filed under "frozen" when part of it belongs under "deleted".

Six downgrade articles in one table

Each row below comes from that vendor's own help centre, read on 19 September 2026. Source links are in the sections that follow and in the verification note at the bottom.

Vendor	What freezes	What hides	What gets deleted, and when	When the downgrade lands
Slack (to Free)	Canvases become read-only; workflows stop; app installs capped at 10	Messages and files older than 90 days	Messages and files older than one year, on a rolling basis	Immediately or at renewal, your choice
Notion (to Free)	Automations become view-only; conditional form logic can't be edited	Every chart except the first one	Version history past 7 days; audit log stops collecting	When the current plan ends (date shown at confirmation)
Airtable (to Free)	Over 1,000 records per base: no new records or attachments	Extensions beyond the limit, disabled but not removed	Snapshots and revision history past 2 weeks	End of billing cycle
Trello (to Free)	Boards go view-only above 10 collaborators	Paid-feature data; boards beyond the 10 most active are closed	Nothing stated	End of billing period
Mailchimp (to Free)	Sending is held while over 250 contacts	—	Whatever you delete to fit the plan first	Start of next billing cycle
Zoom (to Basic)	—	Cloud recordings	Cloud recordings, 30 days after downgrade	—

Two cells in that table need reading carefully. For Trello, "nothing stated" means the help page promises hidden and closed, not deleted. It does not mean it can never happen. For Mailchimp, the deletion is not something the vendor does to you. It is something you have to do yourself before Mailchimp will allow the downgrade. That one gets its own section below.

History windows: the undo button is the data you lose

The losses that people notice last are the ones affecting history rather than records. The records are still there, so nothing looks missing. Only later, when someone needs to see who changed a figure in March, does the gap show.

Notion publishes a full table of what changes at each downgrade, and it is more specific than most. Downgrade to Free and "You'll have version history for your pages going back seven days." To Plus, 30 days. To Business, 90 days. The same table says that on a downgrade to any of those three plans, "Audit log will no longer be available. Notion will stop collecting events for audit log purposes," and custom data retention settings "will revert to the default of 30 days" (Notion Help Center, checked 19 September 2026).

Look at the audit log line again. It does not say the old events will stay available to read. It says the log is unavailable and collection stops. If that log is how you would prove who had access to what and when, export it before the plan changes. Afterwards you have no screen to export it from.

Airtable handles it the same way with different numbers. The Free plan comes with "2 weeks of revision and snapshot history", against one year on Team and two years on Business (Airtable plans overview). The downgrade article then adds the sentence quoted at the top of this page: snapshots outside the new window "are removed and can't be recovered, even if you upgrade later" (Airtable Help Center, checked 19 September 2026). So a base you downgrade keeps every record and loses 50 weeks of the ability to roll back to them.

This is easy to get wrong because the data looks complete. Open the base and every row is there. The revision history is what shows when each field changed, and on the free tier it only goes back two weeks.

What to do about it is simple and has to happen first. Take a snapshot export or a full base download while the long window still exists. For Notion, export the workspace and the audit log on the paid plan. Store both with the rest of the retirement archive. The general version of this rule, which records you may still need to produce years later, is on the records-you-must-produce page.

Frozen by headcount: limits that count people, not data

Some free tiers do not limit how much data you have. They limit how many people can be in the workspace. Go over that number and the whole workspace freezes, not just the part over the line.

Trello's rule is the clearest example. Its help page says: "If your Workspace has more than 10 collaborators currently, the boards in this Workspace will become view-only." Automations also stop running. Collaborators include Workspace members, guests on individual boards, and "pending board and Workspace invites". People who are only members of closed boards do not count, and neither do deactivated accounts (Trello collaborator limit, checked 19 September 2026).

That definition matters more than the number. Pending invitations count. Someone invited in 2023 who never accepted still uses up one of the ten places. Before you downgrade a Trello workspace, go through the member list, the guest list and any unanswered invitations. Clear out the invitations nobody is waiting on.

Trello's second rule is about boards. Its plan-change article says that after the paid period ends, "The 10 most active Workspace boards will remain open. Other boards will be closed, but not deleted," and that "Data from paid features will be hidden, but not deleted. Export data before downgrading, or upgrade again to view the data" (Trello, change or cancel your plan, checked 19 September 2026). Trello decides which ten boards are "most active", not you. The page also says you can close extra boards or move them to another Workspace before downgrading. That lets you choose the ten yourself. If you are parking the old system, the boards you would look up later are probably the ones that have gone quiet. Those are the ones a "most active" rule will close.

Airtable's Free plan counts editors separately from viewers: "unlimited collaborators with 'Read only' permissions", and a limit of five with Editor or Creator permissions and 50 with Commenter permissions. Its downgrade article does not say what happens to a workspace that has more editors than that on the day it changes. Check the workspace's own billing screen before you rely on it. Don't assume in either direction.

Frozen by volume: the 1,000-record line

Airtable is where the volume limit bites. "1000 records per base (1000 records per table max will also hit base record limit)" on Free, and 1GB of attachment storage per base. Its downgrade article says what happens above the line: "you can't add new records or attachments until you're back under the limit." The existing data "stays in place".

For a system you are keeping only to look things up, that freeze may not matter. You were not going to add records anyway. The two things that do matter:

Automations and syncs. Airtable says automation runs are "paused or limited to the Free plan quota" and that synced tables from paid sources "become read-only or stop syncing". If something still writes into the old base during a parallel run, it stops. Nothing announces that it stopped. The integration failures this causes are covered in the page on parallel running.
API calls. Free includes 1,000 API calls per workspace per month. A one-time full dump of a large base through the API can use that up in an afternoon. Do the API export before the downgrade.

Notion has a similar line, but it is set by how many people are in the workspace rather than how many records. Its downgrade table says that if the workspace "has two or more people in it, you'll be able to use up to 1,000 blocks". With one person it stays unlimited. A block is a paragraph, a heading or a database row. A team workspace of any real size is far past 1,000 blocks, so a downgraded team workspace can be read but has very little room to add anything.

The downgrade that asks you to delete first

Mailchimp turns the order around. The other vendors downgrade you and then decide what to hide. Mailchimp checks first whether your account already fits the Free plan, and the Free plan is small: "up to 250 contacts and 500 sends per month, with a daily send limit of 250", one audience and one seat (Mailchimp pricing plans, checked 19 September 2026).

Its plan-change article says Mailchimp will "let you know if there are any changes you need to make in your account before you downgrade. Changes could include deleting contacts, seats, or audiences." If conflicts remain after the downgrade, "sending will be paused until the changes are made". It also says, more briefly: "You can downgrade from any paid plan to a Free plan only once over the life of your account" (Mailchimp, change or pause your plan, checked 19 September 2026).

Here is how that goes wrong. The same pricing article defines the count: "Subscribed, unsubscribed, and non-subscribed contacts are included in your contact count." So an account with 180 subscribers and 900 unsubscribes is far over 250, and the quick way down is to delete the unsubscribes. They look like dead records. They are actually your suppression list, the record of who asked not to be emailed. If that history is ever needed in another tool, it has to come from somewhere, and once they are deleted it cannot come from Mailchimp. Why suppression records need to reach the next platform before anything else is covered in the Mailchimp to Klaviyo move.

Mailchimp offers a better route itself. The same definitions say "Archived, cleaned, and deleted contacts don't count toward your contact total". Its archiving article says archived contacts are removed from the contact table "without losing any of their data" and that "Archived contacts don't count toward your billing tier" (Mailchimp, archive or unarchive contacts). The same page carries a warning: under GDPR, archiving "is not a legal substitute for deletion" when an EU contact asks to be removed. That is a legal question to take to whoever handles privacy requests where you work. Mechanically, archive and export first, and only delete what you have decided to delete.

Two more Mailchimp points. The one-downgrade rule means you can't downgrade as a test, look around and undo it. And if the real goal is to stop paying for a few months while keeping everything, Mailchimp also has a pause: "3 or 6 months", "limited to 2 pauses every 12 months", and "Pausing retains your data so you can use the account again". At the end of the pause, "Your account automatically unpauses and resumes billing". Put that date in the calendar the day you pause.

The 30-day clock on recordings

Zoom is the plainest example of the third pile. Its troubleshooting article on missing recordings says: "If you were previously able to create cloud recordings, and then were downgraded to a free account, your cloud recordings are set to be deleted after 30 days. To access the recordings, you must resubscribe to a paid account again within the 30 day period prior to deletion" (Zoom Support, checked 19 September 2026).

That article is about troubleshooting, not billing. Someone planning a downgrade would open the billing pages, where this is easy to miss. Recordings are also often the only copy of something: a client call that was never written up, a training session given by someone who has since left. Download them to storage you control before the licence goes. On an account with years of recordings that can take a while, so start early.

Slack, briefly, because the clock was already running

Slack's free-tier rules are covered in detail on the parallel-running page and the Slack export page, so here are just the parts that fit the three piles. On the free version, "you'll be limited to the most recent 90 days of message and file history, and all data in your workspace that's more than one year old will be deleted". Canvases "will be converted to read-only". "Existing workflows will stop working when you downgrade". Slack Connect channels "will disconnect" (Slack, feature limitations on the free version, checked 19 September 2026).

That is one downgrade touching all three piles at once. The canvases freeze, the 90-day history hides, and content older than a year gets deleted.

The billing wording is worth reading too. Slack's plan-change article lets you pick whether a downgrade to Free happens "immediately or on your next renewal date". For a downgrade from Business+ to Pro it mentions crediting "Slack credits equal to the cost of any unused portion", and it adds that credits "have no currency or exchange value, are non-transferable and non-refundable, and will expire following the termination of your paid Slack plan" (Slack, change or cancel your paid plan). The Free section of that article does not mention credits. So on an annual plan, switching to Free immediately rather than at renewal may mean giving up the paid time you have left, and the help page does not say otherwise. Ask Slack's billing team about your own account before you choose "immediately". Which date your renewal really falls on is its own question, covered in the cancel-by date page.

Before you cross the line: a short running order

These steps come from the tables above, and they follow one rule. Anything in the deleted pile has to be captured while you are still on the paid plan. Anything in the hidden pile has to be captured while it still exists.

Read the vendor's downgrade article, not the pricing page. Notion, Airtable, Trello and Slack all have one. Put each thing it says goes away into one of the three piles, and note the date next to anything in the deleted pile.
Check when the downgrade lands. End of billing period for most. Slack lets you choose. A downgrade landing at the end of an annual term can be eleven months away. So can every clock it starts.
Export the history, not just the records. Airtable snapshots, Notion version history and the Notion audit log all need the paid plan to export. Records can usually wait. History can't.
Download anything on a timer. Zoom recordings within 30 days, Slack content before its one-year date. Do this before the downgrade, not after the first reminder email.
Choose what stays open. On Trello, close or move the boards you don't need so the ten that remain open are ones you picked. Clear pending invitations to get under ten collaborators.
Archive, don't delete, to fit a limit. On Mailchimp, archive contacts to get under 250, export the whole audience first, and remember you only get one downgrade.
Turn off anything that still writes into the old system. Automations and syncs stop or get throttled on a free tier, usually without any error you would see.
Open the downgraded account once, a day after it lands. Confirm you can still read and export what you expected. If something is frozen that you thought would stay editable, it is better to find out while an upgrade can still undo it.

Most of this can wait until the week before the downgrade. The history exports can't. Once the new window is in force, the older history is deleted, and an upgrade will not restore it.

The fuller pre-cancellation list, for when you are closing the account rather than parking it, is on the twelve-things page.

Verified against Slack, Notion, Airtable, Trello, Mailchimp and Zoom documentation on 19 September 2026. Slack: feature limitations on the free version, usage limits for free workspaces and change or cancel your paid plan. Notion: downgrading your Notion plan. Airtable: upgrading and downgrading your workspace plan and plans overview. Trello: collaborator limit for free Workspaces and change or cancel your Trello plan. Mailchimp: about pricing plans, change or pause your plan and archive or unarchive contacts. Zoom: troubleshooting missing cloud recordings.

Free-tier limits are among the most frequently edited lines in any vendor's documentation, and every limit above could change without notice. Treat the numbers as the values on the date in bold. Six vendors are named because they publish their downgrade behaviour in their own words, not because any of them is being recommended or ranked. If a quotation here no longer matches its source, the contact page reaches me and the claim gets re-checked.