What paper sizes are supported by the HP LaserJet Pro MFP M28-M31?

The printer supports Letter (216 x 279 mm), A4 (216 x 297 mm), A5 (148 x 210 mm), Envelope #10 (105 x 241 mm), Envelope C5 (162 x 229 mm), Envelope DL (110 x 220 mm), and custom sizes ranging from 76 x 127 mm to 216 x 356 mm. All of these sizes are compatible with the input tray. (Page 7)