This was very easily one of Tottenham's best performances for some time, but Ange Postecoglou's side will come away disappointed.
After conceding an early opener, Spurs recovered and took charge for the rest of the game - limiting Eintracht Frankfurt to zero shots on target in the second half.
It was the most unlikely of finishes from Pedro Porro that claimed the equaliser, with the Spanish right-back sweeping home a silky backheel flick.
Tottenham's more conventional shots at goal proved to be in vain.
Son Heung-min and James Maddison's curling strikes from close range were superbly stopped by Kaua Santos, who also prevented Micky van de Ven from heading home an injury-time winner with a brilliant fingertip save.