Your file stays in this browser. This tool has no upload, analytics, or storage connection. Local checks do not establish matching or campaign eligibility.
Use the current LinkedIn upload template. The stored headers were checked on 24 October 2026. If LinkedIn changes its template, follow the current official template.
Choose a file. No file has been checked.
Download this HTML file and the checker script into the same folder to run offline. The report contains counts and repair instructions, not your contact values.