Ravi jii,
Kindly send me some big file in Krutidev font for testing the converter. I will update this converter by including the remaining characters.
On my PC systems, many times I face peculiar problem. If I input the whole text of the file, the system hangs. But if I input it in a few pieces, it works. Again in some case problem comes not because of size, but due to some special character due to the presence of which even one word is not converted. Once I traced one such word which ended with Z. When I replaced it with some other option, it worked.
You may also try the converter with changing the chunksize from 6000 to some other number, say, 10000.
---Narayan Prasad