The Xiaomi Redmi A3 has a simple and minimalist design, with a glass front and a plastic back. The back panel comes in three colors: Midnight Black, Olive Green, and Lake Blue. The back also has a dual camera module and a LED flash. The phone has a waterdrop notch on the front, which houses the selfie camera.
The phone measures 168.3 x 76.3 x 8.3 mm and weighs 199 g, which makes it fairly large and heavy. The phone has a USB Type-C port, a 3.5 mm headphone jack, and a speaker grille at the bottom. The phone also has an infrared port on the top, which can be used to control compatible devices. The phone has a dedicated microSD card slot, which can expand the storage up to 1 TB.
The phone has a flat frame, which is made of plastic and has a matte finish. The frame has a power button and a volume rocker on the right side, and a SIM tray on the left side. The power button also doubles as a fingerprint scanner, which is fast and accurate. The volume rocker is easy to reach and has a good tactile feedback. The SIM tray can accommodate two nano-SIM cards and a microSD card.
The phone has a glass front, which is protected by Corning Gorilla Glass 3. The front has a waterdrop notch, which is small and unobtrusive. The notch has a 5 MP selfie camera, a proximity sensor, and an earpiece. The front also has thin bezels on the sides and the top, and a slightly thicker chin at the bottom. The phone does not have a notification LED, but it supports always-on display.
The phone has a plastic back, which has two variants: a glass-like one and a leather-like one. The glass-like one has a glossy and smooth surface, which reflects light and creates a gradient effect. The leather-like one has a textured and soft surface, which feels comfortable and prevents fingerprints. The back has a circular camera module, which is slightly raised and has a metal ring around it. The camera module has an 8 MP main camera and a 0.08 MP auxiliary lens. The back also has a Redmi logo at the bottom.