Don't put a mousepad under your pen tablet.

No, it will cause tracking issues. Pen tablets are designed to sit on a flat, hard surface. Adding a mousepad introduces unevenness, thickness, and sometimes a slippery surface that messes with the position detection and pressure sensitivity.

Most tablets use electromagnetic resonance (EMR) technology that works best when the tablet is in direct contact with a stable desk. A mousepad lifts the tablet slightly, creating a soft gap that can throw off the pen’s accuracy, especially around the edges. Plus, cloth mousepads can bunch up under the tablet’s feet, causing wobble.

If you want a softer writing feel, get a tablet with a textured surface or use a felt nib on your pen. Otherwise, just use the tablet directly on your desk.

Your pen wants a hard, level surface. Don’t give it a cushy mattress.