Auto Save — is free and MIT licensed composer require ptplugins/filament-auto-save
See our Pro plugins Get it on GitHub

Auto Save — Free Demo

ptplugins/filament-auto-save — every keystroke below is snapshotted to your browser's localStorage. Edit any field, then reload this page (F5): a Filament notification will offer to Restore or Discard the draft. Nothing is sent to the server while you type. Free & MIT.
Saving clears the stored draft — a reload afterwards has nothing to restore.

The whole integration

use PtPlugins\FilamentAutoSave\Concerns\HasAutoSave;

class EditPost extends EditRecord
{
    use HasAutoSave;
}

One trait on a Create/Edit page. No Blade edits, no JavaScript, no server round-trips. The storage key is unique per panel, per resource and per record id, so drafts never leak between records.