how to transform M15 into H1 history data?

[Forex Trader]

Hi,
I just downloaded some MT4 history data, M15, from 1999 to 2005. That's very useful for me.
I wonder if I can transform this M15 data into H1 or H4 ....

Thanks.

[Forex Trader]

I just downloaded some MT4 history data, M15, from 1999 to 2005. That's very useful for me.
I wonder if I can transform this M15 data into H1 or H4 ....

You can try to use "MQL4: Period Converter Optimized"

[Forex Trader]

Thanks Tatyana.
Sorry I didn't mention that I want to switch between M15 and H1 chart in "step by step" mode in the same chart, but this "MQL4: Period Converter Optimized" creats another chart. Anyway, this "MQL4: Period Converter Optimized" is a great tool, I'll use it in other purposes later.

Any other way to convert M15 into H1 ?