Portfolios show what you made. Case studies show what you changed. Buyers don't hire you for screenshots — they hire you for outcomes, and a case study is how you prove you create them.
Structure around the transformation
Every strong case study follows the same arc: the challenge the client faced, what you did about it, and the measurable result. Lead with the problem, not the deliverable, so the reader sees themselves in the story.
Use real numbers
Specifics build credibility. “Increased signups by 41%” lands far harder than “improved conversions.” If you can't share exact figures, use ranges or relative gains — anything concrete beats vague praise.
End each case study with a clear next step. A reader who just saw proof you can help them is your warmest possible lead — don't make them hunt for the contact button.