As a simple application of the js-gedcom project, this page lets you check for errors or not-recommended behavior in GEDCOM files. It does so entirely in your browser, with no access to a server except to load this page. It will work even if you disconnect from the Internet after loading this page and before picking a GEDCOM file to validate.
To check a GEDCOM file against the FamilySearch GEDCOM 7 specification, pick the file below. If it meets the spec, no errors or warnings will be displayed. If not, errors and/or warnings will be displayed.