What is an AI writing checker?
An AI writing checker scans your prose for the fingerprint patterns AI tools like ChatGPT and Claude leave behind — the rhythm, word choices, and sentence structures that make writing sound AI-generated, even when it's grammatically correct. This free checker runs 20+ pattern rules across seven categories, entirely in your browser. No signup, no upload, no word limit.
It's a writing-improvement tool, not an AI detector: it doesn't guess whether text came from a model, it shows you the specific crutches weakening your prose so you can fix them. Paste a scene, see every flag, and either apply a safe one-click fix or rewrite the harder ones.
What this AI writing checker detects
kill Dead Verbs
The #1 AI fingerprint. AI leans on "was [verb]ing" constructions and delay verbs like "began to."
kill Tell Not Show
Naming emotions instead of showing bodies and actions. The classic "she felt a deep sadness."
kill AI Crutch Phrases
Abstract sensory summaries AI reaches for reflexively — "a tapestry of," "the weight of," "a symphony of."
kill Dialogue Tags
Fancy tags ("admitted," "ventured," "mused") and tag-adverbs ("said softly") are the top AI tell in dialogue.
kill Purple Prose
Overdecorated description — "orbs" for eyes, "cascading obsidian locks." Stacked adjectives doing too much.
warn Passive Voice
Passive constructions weaken action and hide the actor. "was struck by the arrow" vs. "the arrow struck him."
info Adverb Density
A few adverbs are fine; a high density is an AI tell. Flagged only when you exceed ~3 per 500 words.
How to use the free AI writing checker
1. Paste your prose into the box (or click Open file to load a .txt or .md manuscript). 2. Hit Scan for AI patterns — flags appear inline in your text and in the sidebar, grouped by category and severity. 3. Click any highlight to jump to it, use ↑/↓ to walk through flags, and click Replace on any flag with a safe one-click fix. For flags that need a rewrite, click Fix in Inkstride to bring the passage into the full editor.
Frequently asked questions
Is this AI writing checker really free?
Yes — 100% free, no signup, no upload, and no word limit. It runs entirely in your browser using pattern rules, so there's no per-use server cost. That's why it can stay free.
Does it upload or store my writing?
No. Everything runs client-side. Your text never leaves your browser — nothing is uploaded, stored, or sent to a server. You can even load a file straight from disk with the File System Access API.
Will it tell me if my text was written by AI?
No — this isn't an AI detector (like GPTZero or Originality). It doesn't predict provenance. It's an AI pattern checker: it surfaces the specific writing crutches that make prose sound AI-generated so you can revise them. Useful whether the draft is AI-assisted or fully human.
How does it detect AI writing patterns?
With 20+ regex pattern rules covering seven categories — dead verbs, tell-not-show, AI crutch phrases, dialogue tags, purple prose, passive voice, and adverb density. No AI model is called, which is why it's instant and free at any length.
What's the difference between this checker and Inkstride?
This free checker flags the patterns. Inkstride (the paid editor) fixes them — one-click rewrites, a deeper LLM prose audit across five lenses, and lore-aware AI that learns your story. Think of the checker as the free diagnosis; Inkstride as the cure.
What kind of writing does it work on?
It's tuned for fiction prose — novels, short stories, scenes, chapters. The patterns target narrative AI fingerprints specifically, so it's most useful on creative writing rather than emails or reports.