A convertible is a type of automobile in which the roof can retract and fold away, converting it from an enclosed to an open-air vehicle. Many different automobile body styles are manufactured and marketed in convertible form.

Roof designs vary widely, but a few characteristics are common to all convertibles. Roofs are affixed to the body of the vehicle and are usually not detachable. Instead the roof is hinged and folds away, either into a recess behind the rear seats or into the boot or trunk of the vehicle. The roof may operate either manually or automatically via hydraulic or electrical actuators, and the roof itself may be constructed of soft or rigid material. Soft-tops are made of vinyl, canvas or other textile material, while hard-tops are made of steel, aluminum, plastic or other rigid materials.

Contemporary convertibles are known and marketed under several different terms due to the convergence of body styles over the years. A soft-top convertible may also be referred to as a cabriolet or cabrio, although two-seater soft tops often retain the name roadster, referring to their body style. Hard-tops are marketed under the terms coupé cabriolet, coupé convertible or simply retractable hardtop, while two-seaters more commonly use coupé roadster/roadster coupé.

Folding textile roof

The collapsible textile roof section (of cloth or vinyl) over an articulated folding frame may include linings such as a sound-deadening layer or interior cosmetic headliner (to hide the frame)  — or both — and may have electrical or electro-hydraulic mechanisms for raising the roof. The erected top secures to the windshield frame header with manual latches, semi-manual latches, or fully automatic latches. The folded convertible top is called the stack.

Pros and cons

Convertibles offer the flexibility of an open top in trade for:

• potentially reduced safety
• poor break-in protection
• deterioration and shrinkage of the sun-exposed textile fabric over time
• diminished rear visibility, from a large roof structure, small rear window, or obstructed rear window — or all of these: e.g.,MINI convertible.
• generally poor structural rigidity. Contemporary engineering goes to great length to counteract the effects of removal of a car's roof. For example, a 2007 article in the New York Times, referring to the Volkswagen Eos, reported:

• specifically poor structural rigidity, such as pronounced scuttle shake, a characteristic whereby the structural design of the bulkhead between engine and passenger compartment of a convertible suffers sufficiently poor rigidity to negatively impact ride or handling — or allow noticeable vibration, shudder or chassis-flexing into the passenger compartment.