What is a voice doc?

A voice doc is a written description of how you sound: sentence length, vocabulary, structure, the jokes you make, the claims you refuse to make, and the words you never use. It is part style guide and part sample book, and it exists so that anything written on your behalf, by a teammate or by a model, comes out recognizable as you rather than as generic marketing copy.

What goes into a voice doc?

Rules and evidence, in that order. The rules are specific and testable: short sentences, no exclamation marks, never say enterprise, always name the price, start with the problem. The evidence is five to twenty of your own posts, chosen because they sound most like you, with a note on what each one gets right. A good voice doc also records what you will not claim, which is the part that keeps a draft honest when it is generated at volume.

How do you build a voice doc from your own posts?

Start with what you already wrote. Paste in the posts, emails, and replies you would be happy to see again, and pull the patterns out of them rather than inventing a voice from scratch. Then test it. Generate a draft, read it, and vote on whether it sounds like you. The votes are the real input, because people describe their own writing badly and recognize it instantly.

Why does a voice doc matter for AI drafts?

Because a general assistant like ChatGPT has a house style, and without instructions it will use that style. The result reads competently and sounds like nobody, which is the fastest way to make a founder's feed stop working. A voice doc turns drafting into editing, which is the difference between a posting cadence you can hold and one you abandon. It matters most in founder led marketing, where voice is the main advantage over a larger competitor. The case for writing plainly is in this post.

Questions

How long should a voice doc be?

One page of rules and a handful of examples. Longer documents get skimmed, and models weight a short specific instruction more reliably than a long essay about brand values. If something in it has never changed a draft, cut it out.

Can a voice doc capture more than one voice?

It can, and it usually should. Most founders write differently on LinkedIn than on X or in a Reddit reply. Keep one core doc for what never changes, then a short per platform section for tone and length. Keeping five unrelated voice docs is how they all go stale.

Does a voice doc make every post sound the same?

Only if it is written as a template. Rules about tone and vocabulary leave the structure free, and a post's shape should come from what it is saying. If your drafts are converging on one format, the problem is the prompt or the plan, not the voice.