If you have been writing articles and blogs online, and your articles have been getting rejecting on the grounds of spelling mistakes and grammatical issues, then all you need is a tool to expose you those mistakes to you before your reviewer finds them out. Once you are aware of those mistakes then you can correct them and use alternatives so that your content becomes spelling mistake and grammatical errors free.
spellcheckplus.com is one of those websites, which can help you in those issues. They simply give you a text box where you would paste your content and click on 'Check Text'. It will show you a waiting image and then finally show you those spelling errors and grammatical mistakes along with suggestions on how to improve on them. Once you click on them, they will show the alternatives to be used.
However, one limitation of this website is that you can put at most 2000 characters in that text box. So, if you have to check bigger articles then you need to do it paragraph by paragraph, and then combine those corrected paragraphs to compile the complete articles. Make sure that you keep checking your article as long as there are no more show stopping issues in your articles. You can ignore 'Explain' or 'Explain passive' as they are not really any problems.