Lead magnet advice almost always covers the same ground: pick a topic, solve a problem, design a cover. All reasonable, and none of it explains why two ebooks of similar quality convert at very different rates.
The difference is usually delivery: what a visitor can see before the form, how much you ask for, and what happens after they submit.
The central problem: you are asking for trust first
The standard setup asks a visitor to hand over an email address for a document they have not seen, from a company they may not know, in exchange for a promise on a landing page.
Most people have downloaded enough disappointing PDFs to be sceptical. They know the ebook might be four pages of introduction and a sales pitch. So they decline, and you conclude the topic was wrong.
The fix is to stop asking them to take it on trust.
Let them read some of it first
Rather than a cover image and bullet points, put the document on the page and let visitors read the first few pages. The form appears when they reach the limit.
This changes the exchange in three ways.
The visitor knows what they are getting. Scepticism is answered by evidence rather than claims.
They have already invested attention. Someone who has read three pages and wants the fourth is in a different state from someone deciding whether to start.
It disciplines your writing. If the first pages have to earn the email, you cannot open with three pages about your company. That constraint tends to improve the whole document.
The obvious objection (that you are giving away part of it), misreads the economics. You are not selling the ebook. You are trying to reach people who will find it useful, and the ones who read a preview and leave were never going to read the full document anyway. You have lost an unusable email address.
How much to show
Enough that the quality is unmistakable, and stopping at a point where the reader wants more.
Around three pages is a common default and a sensible starting point for a twenty-page document. What matters more than the number is which pages. If the first three are a title, a contents page and an introduction, you have shown nothing. Front-load something useful: the first real insight should be visible before the gate.
Adjust by document. Longer, denser documents can show proportionally less. A short checklist may need to show almost none, because there is little to hold back.
Ask for as little as possible
Every additional field costs you submissions. Email alone converts best. Adding a name is usually worth it if you personalise later; adding company, role, phone and company size is worth it only if a sales team genuinely acts on those fields.
Be honest about that. Many B2B forms collect six fields that nobody ever looks at, at a real cost in lost leads.
Decide about double opt-in deliberately
Double opt-in sends a confirmation email and only counts the subscriber once they click it.
It reduces your list size and improves it: mistyped addresses and throwaway ones fall away, so deliverability improves and your reporting reflects reality. It also gives clearer evidence of consent, which matters under most privacy regimes.
The cost is a step where people drop out, particularly if the confirmation email is slow or lands in spam.
Rough guidance: use it when the list feeds a long-term relationship, and consider skipping it when the document itself is the point and the follow-up is minimal. Whichever you choose, deliver the document immediately rather than only after confirmation, making someone check their inbox before they can read anything is where most of the loss happens.
Setting this up on WordPress
Our Lead Capture addon for TNC FlipBook 3D does exactly this pattern: readers browse a configurable number of pages, three by default, and the opt-in form appears when they reach the limit. Heading, message and button text are all editable, an optional name field is available, and double opt-in can be switched on per your judgement above.
Leads are stored in your own WordPress database and exported as CSV, which is worth noting: there is no external service holding your list, and no per-lead fee as the list grows.
What to do after the download
Most lead magnets fail here rather than at the form. Someone downloads a document, receives nothing for six weeks, then gets an unrelated newsletter and unsubscribes.
Two things help. Send something related within a few days, while the subject is still on their mind. And segment by what they downloaded: someone who took a pricing guide has different intent from someone who took an introductory explainer, and treating both identically wastes the signal you just collected.
A short checklist
- Is something genuinely useful visible before the form?
- Are you asking only for fields you will use?
- Does the document arrive immediately?
- Is it readable on a phone, where most people will open it?
- Is there a follow-up planned before you launch?
- Does your privacy notice say what you will do with the address?
Frequently asked questions
What is an ebook lead magnet?
A document offered in exchange for contact details, usually an email address. The exchange only works if the perceived value clearly exceeds what you are asking for.
How long should a lead magnet ebook be?
Long enough to be useful, short enough to be finished. Ten to twenty focused pages generally outperforms sixty padded ones. People value a document they actually completed.
Should I gate my ebook at all?
It depends on the goal. Gating builds a list; ungated content builds reach and search visibility. A common compromise is to publish the substance as an open web page and offer the designed document as the download.
How many form fields is too many?
Every field costs submissions. Email alone converts best. Add fields only when someone genuinely acts on them.
Do I need double opt-in?
Not always, though it improves list quality and gives clearer evidence of consent. Requirements vary by jurisdiction and by what you intend to send, so check your obligations rather than copying someone else’s setup.
Where should the leads be stored?
Wherever you can export them from. Storing leads in your own site’s database avoids per-lead fees and keeps the list portable if you change email provider later.
