"If the label says:
- Animal Welfare Approved, American Humane Certified, or Certified Humane - eggs came from farms independently certified by animal welfare nonprofits (note: the latter two do allow beak-cutting).
- Cage Free - not regulated, but it usually means producers keep hens uncaged in barns or warehouses (though often there's no outdoor access).
- Free Range - typically means the hens are uncaged and have outdoor access - but nobody checks on the amount or duration.
- Natural - the USDA says Natural food products can't contain "any artificial or synthetic ingredients, and it must be minimally processed" - vague enough that it could apply to just about any egg.
- Organic - third-party-audited label that means the hens are uncaged and have access to the outdoors, and get a diet of organic, vegetarian feed without any antibiotics (beak-cutting and forced molting are permitted).
- Pasture Raised - unregulated, but typically birds raised this way have the chance to go outdoors and eat an organic diet.
- United Egg Producers Certified - producers can restrict hens to small cages and beak-cutting is allowed (but forced molting isn't).
- No Label - the hens were probably raised in a factory farm; if a company can make a claim, it usually will."
Of course, if you keep chickens yourself, all of the guesswork is eliminated!
*Image from here.