Usually you submit the whole paper (full text) to the editorial board and the editorial board team decides how to process your article against plagiarism checking. So you do not have too much influence on it.
Thank you for the valuable response Dr. Anna Małgorzata Kamińska. Some journals require maximum percent for similarity index, so it is preferable to check it before submission to ensure it will not exceed that percentage.
you are right, but on the other hand usually we don't know the software they are using or even if we know we have no license to check similarity index using this software by ourselves. And different software can use different algorithms and papers corpus what usually results in different similarity index. So self-checking against plagiarism is not strict and gives no guarantees.
I agree with you Dr. Anna Małgorzata Kamińska. There are no guarantees in self-checking against plagiarism. On the other hand, knowing the percentage give us a partial reassurance, especially if the percentage is far from the maximum required limit.
I agree. In fact similarity index evaluated during self-checking by free platforms are usually smaller that evaluated by profesional platforms. This results from the fact that profesional platforms have access to all resources that free platforms have, plus to resources with scientific articles protected by copyrighs. So if you are only closing to given value during self-checking you should expect what value evaluated by editorial board can be only greater !
You are right dear Dr.Anna Małgorzata Kamińska. I took this issue into account when I checked the similarity index using free platforms. Thank you for the good explanation.