File Format
Export as a PDF with selectable text, at the correct page size; never a photo of your resume.
The file format is the last thing standing between a well-written resume and a reader who can actually open and search it.
PDF, with real text, not a scanned image
A PDF preserves your layout across devices and keeps the text selectable and searchable, which most ATS software relies on to parse a resume correctly. A photo, screenshot, or a PDF made from a scanned page can't be parsed at all.
Match the page size to where you're applying
The US and Canada use Letter (8.5" × 11"); most everywhere else uses A4. Submitting the wrong size can shift margins or push content onto an extra page when the recruiter's printer or viewer renders it.
A one-file PDF export, correct page size, with your name in the filename (e.g. john-doe-resume.pdf).
A .docx file with tracked-changes comments still in it, or a photo of a printed page.
Put it into practice
Build your resume in Fit The Role and these principles are already built into the editor and templates.