For a rigorous and formal academic institution, confidentiality is the most important thing. An academic paper from conception, experimental design, experimental operation, performance testing, data processing to final paper writing has injected too much effort into the author. If it is cheaper to find an informal institution, which leads to the leakage of the paper, it will not be worth the loss. Therefore, the manuscript transmission system of formal institutions must have strict security protection measures. In addition, all editors need to sign confidentiality agreements, instill confidentiality awareness, and strictly protect users' personal information and manuscript security.
There are also institutions that provide "language editing certificates". Don't underestimate this certificate, because only institutions recognized by publishing houses have this qualification! With it, you can prove that the paper has been polished by an English editor and reached the English standard for submitting journals, so not every polishing company can provide it.
International scientific editors are recommended by paper polishing institutions. In the field of international academic publishing, being able to use high-level written English has great advantages. All international science editors are professionals from English-speaking countries with relevant professional backgrounds. They polish the articles from grammar, spelling, sentence patterns and other aspects, and choose professional words that meet the reading habits of English-speaking countries, so as to make the edited articles clear and unambiguous and ensure that the edited articles reach the level of English publishing of scientific and technological documents.