Mercury Copywriting was founded in Lyon in 2018 by a direct-response copywriter who spent twelve years watching agencies sacrifice speed for bureaucracy and quality for volume. We built Mercury around the conviction that great copywriting should be fast, precise, and measurably effective — like the Roman god whose name we carry.
Our team of seven includes three senior copywriters (backgrounds in journalism, direct response, and luxury brand communications), a brand strategist, a research analyst, an editor, and a project manager. Every writer has at least eight years of professional experience. We do not employ junior writers for client work. When you commission Mercury, a senior specialist writes your words.
Based in Lyon's Presqu'île district, we serve clients across France, the UK, Germany, Switzerland, and the US. Over 190 brands served. 2.1 million words delivered. Average conversion rate across all client projects: 4.3%. Our clients return because we deliver on three promises simultaneously: speed (we meet every deadline), quality (every word is deliberate), and results (we track performance, not just word count).
We do not use AI to write client copy. AI accelerates our research and analysis — keyword mapping, competitive intelligence, voice-of-customer synthesis. But the words that carry your brand, persuade your customers, and earn their trust are written by a human being who understands nuance, cultural context, rhythm, and the precise difference between good enough and exceptional.
Speed Without Shortcuts
Mercury delivers fast because our process is tight — not because we cut corners. Seven-day turnarounds are standard, not emergency surcharges. We built our workflow for velocity.
Measured, Not Decorated
We track conversion rates, email opens, click-throughs, and revenue attribution. Copy that sounds beautiful but fails to convert is literary decoration. We write for outcomes.
Structured for Independence
Every engagement produces reusable assets — voice guides, messaging frameworks, vocabulary lists — that let your team produce on-brand copy without us. We build capability, not dependency.