Every season comes with you
Standings, champions, draft picks, and final matchup scores for each year of your league's history.
Free Chrome extension · Full history included
League HistoryImport
Your league's history belongs to you. Import years of standings, champions, drafts, and matchups in minutes — nothing changes on your old platform.
Why leagues move
Switch without losing a thing
Trash talk needs receipts. The extension carries over every season your old platform still exposes, so years of rivalries survive the move.
Your old league is untouched
The extension only reads your league using your own signed-in session. Nothing on your old platform is changed or removed.
Keeper and dynasty ready
Tell it your league type and your rosters carry into your first Sleeper draft the right way.
Fast and safe
Minutes, not weekends
No spreadsheets, no screenshots, no re-typing rosters. One click reads your league and builds the Sleeper version for you — most leagues finish in minutes.
How it works
Easy to start. Hard to stop.
- 1
Add the extension
Install it free from the Chrome Web Store on desktop Chrome.
- 2
Open your league
Sign in to Sleeper, then open your league on your old platform. The extension detects it automatically.
- 3
Import to Sleeper
One click builds your new Sleeper league with history attached. Invite your leaguemates from the app.
Draft season is here
Don't lose your history
Leagues are on the move. Bring yours somewhere it can live forever — before old seasons disappear.
Good to know
Frequently asked questions
Is it free?
Yes. The extension is free, and importing your league to Sleeper is free too.
Will anything change on my old league?
No. The extension makes a copy of your league's history using your own signed-in browser session. Your old league keeps working exactly as it did — nothing is moved, changed, or deleted.
What history comes over?
Teams, managers, standings, champions, draft picks, and final matchup scores for every season your old platform still exposes — often ten or more years.
Do my leaguemates need the extension?
No. Only one person — usually the commissioner — runs the import. Everyone else just accepts a Sleeper invite, and the history is already attached to the league.
Does it work for keeper and dynasty leagues?
Yes. Choose your league type during the import and your first Sleeper draft handles keepers and existing rosters accordingly.
I'm on my phone — can I still do this?
The extension needs desktop Chrome, so grab the Sleeper app now and run the import from a computer when you get a chance. Your league will be waiting.