Enter the pinyin of the word you see.
Enter tone number (1,2,3 or 4)
after the letter where the tone mark should appear. For example, type:
a1nji4ng for ānjìng
The number should turn into tone mark (slight delay possible).
For a, o, e, i and u, type tone number after letter, for example:
ā = a1, á = a2, ǎ = a3, à = a4
For
ǘ, type the letter
V.
ǖ = v1, ǘ = v2, ǚ = v3, ǜ = v4