Coffee processing

See which processes keep showing up in coffees you love.

Compare washed, natural, honey, anaerobic, and other methods—then track what you try and which ones earn your best ratings.

15 ways processing can shape a coffee

Open a method for its production steps, expected cup impact, common regions, advantages, challenges, and subtypes.

Washed

High
Wet Processed, Fully Washed

Coffee cherries are pulped to remove the fruit, then fermented in water to remove mucilage, washed, and dried. Most common method globally.

Clean, bright acidity, clarity of flavor. Showcases terroir and variety characteristics. Lighter body.

Natural

Minimal
Dry Processed, Sun Dried

Whole coffee cherries are dried intact with all fruit layers, then hulled. The oldest processing method.

Fruity, complex, heavy body. Wine-like, berry notes. Lower acidity. Sweet, intense flavors.

Honey

Medium to Low
Pulped Natural, Semi-Washed

Skin and pulp removed, but mucilage (honey layer) left on during drying. Named for sticky mucilage, not actual honey.

Between washed and natural. Sweet, balanced acidity, good body. Fruity but cleaner than natural.

Anaerobic Natural

Low
Anaerobic Fermentation - Natural

Whole cherries fermented in sealed, oxygen-free tanks before drying. Creates unique flavors.

Intense, complex, funky. Wine-like, tropical fruit, sometimes boozy or fermenty. Very distinctive.

Anaerobic Washed

Medium to High
Anaerobic Fermentation - Washed

Depulped coffee fermented in sealed tanks without oxygen, then washed and dried.

Complex, clean but intense. Fruit-forward with unique fermentation notes. Bright acidity.

Carbonic Maceration

Variable
CM, Carbonic Mac

Wine-making technique adapted for coffee. Whole cherries in CO2-rich environment. Fermentation occurs inside the cherry.

Unique, complex, often fruity and wine-like. Smooth, less astringent. Tropical fruit, florals, sometimes...

Wet Hulled

Medium
Giling Basah, Semi-Washed Indonesian

Indonesian method. Parchment removed while beans still wet (~50% moisture), then dried. Creates distinctive flavor.

Earthy, herbal, full body. Low acidity. Savory, tobacco, cedar, spice notes. Distinctive Indonesian character.

Lactic Fermentation

Medium
Lactic Process, Lactic Acid Fermentation

Controlled fermentation to encourage lactic acid bacteria growth, similar to yogurt or sourdough fermentation.

Creamy, smooth, silky body. Lactic/dairy notes (yogurt, cream). Reduced acidity, sweet, complex.

Extended Fermentation

Medium
Long Fermentation

Standard processes but with significantly longer fermentation times (48+ hours instead of 12-24).

Intense, complex, funky. Fruit-forward, wine-like, sometimes fermenty or boozy notes.

Co-ferment

Medium
Co-fermentation, Infused Process

Coffee fermented with other fruits, yeasts, or ingredients to impart flavors.

Highly variable depending on additions. Can take on characteristics of added fruits/ingredients.

Thermal Shock

High
Heat Shock

Rapid temperature changes during processing to affect fermentation and flavor development.

Enhanced sweetness, altered acidity. Can intensify certain flavor compounds.

Monsooned

Low (uses environmental moisture)
Monsoon Process

Unique to India. Beans exposed to monsoon winds and humidity, causing them to swell and change color/flavor.

Low acidity, heavy body, mellow. Earthy, spicy, chocolate notes. Distinctive aged character.

Double Fermentation

Medium to High
Two-Stage Fermentation

Coffee fermented twice - once with cherry intact or with mucilage, then again after depulping/washing.

Complex, layered. Enhanced fruit notes, clean finish. Balanced between natural and washed characteristics.

Aerobic Fermentation

Medium to High
Controlled Aerobic

Fermentation in open tanks with oxygen present, but with controlled conditions (temperature, pH, time).

Clean, bright, enhanced fruit flavors. More controlled than traditional fermentation.

Semi-Washed

Medium (less than fully washed)
Demucilaged, Mechanical Demucilaged

Pulped coffee has mucilage mechanically removed instead of through fermentation.

Clean but with some sweetness. Between fully washed and honey. Balanced.