The tool
What the Claude blog post validator does
Paste your draft and press Generate. The blog post validator reads what you gave it and writes back a review: how the piece is structured, where the opening drifts, which paragraphs repeat each other, whether the headings describe what sits under them.
The review runs on our server, so the draft you paste is sent to us. You get 5 free runs every rolling 24 hours, no account, and up to 12,000 characters per run. The output is written text, not a score and not a pass or fail light, because the useful part of a review is the sentence telling you what to change.
The difference
A blog post validator that works before you publish
The tools that dominate this search need a URL. The Apify blog post SEO check takes a URL array and reports columns headed URL, Score, Title, Issues and Words. The AIOSEO analyzer takes your site address and reports on metadata, schema, page speed and indexing. All of them require the post to be live before they will look at it.
The other shape is a CMS plugin. PublishPress Checklists sits inside WordPress and can make a task Required, at which point, in its own words, "it will be impossible to publish without completing the task." That is useful if your draft lives in WordPress. This one takes text, so it works on a draft in a text editor, a shared doc or a notes app, before anything has been published anywhere.
How it works
How to validate a blog post in three steps
Do this on the draft you think is finished. That is when a review earns its keep.
- Step 1
- Paste the draft with its headings intact. The heading structure is part of what gets reviewed, so stripping it to plain paragraphs loses information.
- Step 2
- Add an instruction of up to 300 characters if you want the review pointed somewhere: the introduction, the argument, whether the piece delivers what the title promised.
- Step 3
- Work through the review against your draft. Copy takes the output out of the result pane so you can keep it open beside the document you are editing.
In scope
What the validator can see in a pasted draft
Everything below is present in the text itself, which is why a text tool can speak to it.
- Heading structure
- Whether there is one top-level heading, whether the levels descend in order, and whether each heading describes the section beneath it.
- The opening
- Whether the first paragraph says what the piece is about or spends itself on scene-setting before arriving at the subject.
- Repetition
- Paragraphs that restate each other under different headings, which is the most common fault in a long draft written over several sittings.
- Length and balance
- The live counter above the box gives characters and words as you paste, and the review can tell you which sections are carrying more weight than they deserve.
Out of scope
What a text validator cannot check
PublishPress Checklists is the clearest list of what people mean by validating a post, and most of its items are facts about a CMS record rather than about the writing. It checks for a featured image, featured image alt text and caption, image dimensions, internal and external link counts, minimum and maximum tags or categories, and excerpt length.
None of that is in a pasted draft. Nor is anything about the served page: no page speed, no Core Web Vitals, no mobile usability, no schema, no indexing status. And a link in pasted text is a string of characters here, so nothing checks whether it resolves. Do those in your CMS or with a URL auditor once the post is live.
Long drafts
Validating a post longer than one run
The input is capped at 12,000 characters, which a long guide will exceed. The counter above the box tells you where you are before you try, so there is no surprise at the end of a paste.
Split the piece at a heading rather than mid-argument, and review the sections separately. If you want a view of the whole shape rather than the prose, paste the headings and the first line of each section as one run. That fits easily and it answers the structural question, which is usually the one worth asking about a long post.
The honest answer
Will a validated blog post rank better?
We do not know and neither does anything else on this page. A review can tell you that a section is padded, that two headings promise the same thing, or that the opening takes four sentences to reach the subject. Fixing those makes the post better to read. What happens in a search result depends on a great deal more than the draft.
The URL auditors will hand you a numeric score, which feels like an answer. Apify's output has a Score column and an Issues count. Treat those as a checklist of technical facts about a live page rather than a prediction, which is all they can honestly be.
Limits, stated
What this blog post validator will not do
No URL field, no crawler, no site audit. No score, no grade, no pass or fail. No broken link checking, no schema, no Core Web Vitals, no keyword volume and no competitor data, because none of those live in a text box.
It does not plug into WordPress and cannot block a publish the way PublishPress can. There is no bulk mode and no API. It also will not tell you whether a detector thinks your post was written by a machine: that is a different question, on a different route, and no tool can promise what a third party will report.