Copywriting with Claude: rewrite a page using evidence

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A self-employed consultant knows his "Services" page isn't converting the way it should. The diagnosis already pointed at the culprit: a vague headline and a generic call to action. What remains is the hardest part — finding the words that replace "Simplify your business" with a sentence that actually says what the offer does, without slipping into a vague promise or a number invented to sound credible.

Rewriting a page is not about adding stronger adjectives. It's an exercise in precision: every replaced sentence must say something truer, more concrete or more useful than the sentence it replaces, never the reverse.

This article details the method for analyzing existing copy, producing rewrites grounded in verifiable facts, and avoiding the misleading commercial practice that lurks behind every promise that can't be backed up.

Contents

1. Rewriting is not adding superlatives
2. What a rewrite is entitled to claim
3. Rewriting a page in five steps
4. The mistakes that make a rewrite ineffective or risky
5. When a rewrite alone doesn't solve the problem
6. What we observe among self-employed professionals rewriting their page
7. Training to make your copywriting more reliable
8. Frequently asked questions

Rewriting is not adding superlatives

The most common confusion in copywriting is believing that more persuasive copy means more intense copy — more adjectives, more exclamation marks, more promises. In reality, copy that converts better is almost always more precise copy: it replaces a vague claim with a verifiable fact, or a fuzzy function with a concrete description of what the product or service actually does.

Start from the promise and its proof

Every rewrite starts with a simple question, before you even open a text editor: what does this section actually promise, and what proof actually supports it? A promise with no available proof isn't ready to be written down in black and white, however well phrased; it must first be checked, qualified, or replaced with a more modest but defensible promise.

An inferred persona remains a hypothesis

Copy rewritten from an assumed persona — built solely by reading the existing page — remains a working hypothesis, not established fact. A documented customer profile, built from real conversations with customers, often changes the vocabulary to use and the objections to address first. Without that profile, the rewrite must explicitly flag which assumptions about the audience it made, so they can be corrected rather than taken for granted.

What a rewrite is entitled to claim

French law strictly governs what a commercial page can claim, and that framework isn't a side constraint: it is exactly the filter that separates an effective rewrite from one that exposes its author to a penalty.

Misleading commercial practice, a concrete risk

A false claim, or one likely to mislead regarding the existence, availability or essential characteristics of a product or service, constitutes a misleading commercial practice under Article L121-2 of the French Consumer Code, criminally sanctionable and enforced by DGCCRF. This risk isn't limited to large companies: a line like "the preferred solution for freelancers" with no data behind it, or a delivery time presented as standard when it only applies in some cases, is enough to qualify as the practice.

The simple rule to remember before publishing

The simple rule to remember is this: every verifiable claim must be defensible if a customer challenges it. A satisfaction figure, a delivery time, a comparison with competitors — each of these must rest on something real at the time of publication, not on what you hope to be able to prove later. Whatever can't be verified gets rephrased as a qualitative description of the service, or removed outright.

Rewriting a page in five steps

A rewrite done without a method often produces a longer, more enthusiastic text, but not a more convincing one. The five steps below turn a diagnosis into concrete copy without losing, along the way, the facts that made the page credible.

Step 1: Identify the core promise of each section. Before rephrasing a sentence, note what it actually promises the reader; a section with no identifiable promise is often one that can be removed without loss.

Step 2: Gather the available proof for each promise. Collect what actually exists — a measured figure, a documented case, a feature of the service — before writing a single line, so you aren't tempted to fill the gap in proof with a stronger phrasing.

Step 3: Rewrite the call to action to match the action actually requested. Replace a generic verb with one that precisely describes what happens after the click, consistent with what the next page actually offers.

Step 4: Compare the current and proposed versions side by side. Keep both versions visible and note, for each change, the preserved fact and the reason for the change, rather than silently swapping one text for another.

Step 5: Have the version reviewed before publishing. Someone outside the project checks that every claim remains defensible and that the brand voice stays recognizable beyond the headline, before anything goes live.

The mistakes that make a rewrite ineffective or risky

A few mistakes come up often enough to be worth naming, beyond the legal risk already detailed above.

Changing too many variables at once

Rewriting price, promise and target audience at the same time makes it impossible to know, once the new version is live, which change actually moved the result. An effective rewrite isolates one hypothesis per version, even if that takes more patience than changing everything at once.

Losing the brand voice along the way

A rewrite that gains clarity but loses the brand's own tone solves one problem by creating another: the copy becomes interchangeable with any competitor's. Systematically comparing a rephrased sentence against a representative sample of the existing voice prevents this quiet drift.

When a rewrite alone doesn't solve the problem

Even a rigorous rewrite doesn't fix everything that keeps a page from converting. If the identified problem concerns the visual layout, an overly long form, or the absence of visible trust signals, the fix belongs to a structural audit of the page rather than to text work alone — the two complement each other but don't replace one another. If the problem hasn't yet been pinned down with certainty — if it isn't yet clear which section actually causes it — a prior diagnosis avoids rewriting a section that wasn't the one blocking the decision. Finally, a rewrite never compensates for a poorly defined offer: if deliverables, price or terms remain unclear behind the scenes, no phrasing, however accurate, will make the page durably more convincing.

What we observe among self-employed professionals rewriting their page

In the conversations we have with self-employed professionals about their copywriting, the difficulty is almost never a lack of vocabulary: most people can spot a weak sentence when they reread it. What takes time is the rewrite itself — finding the precise phrasing that replaces a generality with a fact, while keeping the before/after comparison visible so as not to lose track of what changed and why. It's repetitive precision work, not a skill gap, and it's exactly the kind of task a well-built rewriting tool speeds up, without ever deciding on its user's behalf what is true or verifiable.

Training to make your copywriting more reliable

Knowing how to spot an unverifiable promise in theory doesn't stop it from slipping through under deadline pressure. According to the OPIIEC study of June 2025, 64% of French companies already use AI solutions and 88% expect to adopt them within three years; productivity gains observed after AI training in SMEs sit, as an order of magnitude, between 15 and 25%, a benchmark to read as a trend rather than a guaranteed result.

Frequently asked questions

Can an AI-assisted rewrite invent numbers or testimonials?

It never should, but the risk exists if the person reviewing it doesn't systematically check every numeric claim before publishing. A rewriting tool should be configured to flag claims with no supplied proof rather than filling the gap with a plausible estimate, and human review remains the last line of defense against an unintentional misleading commercial practice. A review that systematically compares each figure against the proof meant to support it catches this kind of error before publication, rather than after a customer has already challenged it.

Should the whole page be rewritten at once?

No: rewriting one section at a time — the headline, then the call to action, then the objections — lets you know which change actually improved conversion once it's live. Rewriting everything at once often produces a globally better text, but makes it impossible afterward to identify what made the difference, which robs future rewrites of a useful lesson. Logging the date of each version published also makes it possible to later connect a change in results to the right rewrite, even weeks after the change.

How should a persona inferred only from the existing page be handled?

An inferred persona should be treated as an explicit hypothesis, not as established fact: the rewrite must clearly flag the assumptions made about the audience, so a documented customer profile can correct them as soon as one becomes available. Writing for an assumed persona without flagging it locks an unverified hypothesis into copy that will stay live for months. As soon as real conversations with customers become available, comparing their exact words against those chosen in the rewrite often reveals a vocabulary gap that had gone unnoticed until then.

What is the difference between this copywriting work and a fast marketing diagnosis?

The fast marketing diagnosis spots, across an entire page, the points that most deserve deeper attention; it does not produce replacement copy. The copywriting work detailed here starts from a problem already identified — often by that diagnosis — and produces the concrete sentences that fix it, backed by proof. One usually precedes the other, though the order isn't a strict requirement.

Rewriting a page effectively rests on three disciplines that don't change from one text to the next: starting from a promise and its proof rather than an adjective, respecting what consumer law actually allows you to claim, and isolating one hypothesis per version to know what worked. That is exactly what Market Copy copywriting applies systematically, sentence by sentence, leaving the final decision on every published claim to its user.

Before rewriting, a fast marketing diagnosis helps choose which section to prioritize; once the copy is live, our landing page audit checks that the page's structure also supports the rewritten promise.

Training 100% fundable via OPCO/FIFPL. Qualiopi-certified programme. To learn how to produce precise, defensible marketing copy with AI, as part of our AI for marketers training, contact Educasium and specify your status (employee, self-employed, business owner) and your goal.