Em Dash Filter

About

A tool to help "un-AI" your AI texts. LLM-written prose has a tell: em dashes, lots of them. Em Dash Filter finds every em dash in a document, suggests a natural replacement for each one, and produces a cleaned copy that reads just as well, without the dashes.

HOW IT WORKS
1. Click the toolbar icon and drop in a file (.docx, .txt, or .md).
2. Every em dash appears as a card: its location, the surrounding sentence, and a suggested replacement with the reasoning behind it.
3. Accept the suggestions, override any of them (keep / comma / colon / period / custom text...), or keep everything.
4. Download the cleaned copy. Your original file is never modified.

SMART SUGGESTIONS, NO AI CLOUD
The suggestion engine is a set of grammatical rules that runs entirely on your computer:
• Paired dashes (an aside) → commas, or parentheses if the aside contains commas
• Dash before "but", "which", "and"... → comma
• Dash introducing a list → colon
• Short afterthought → comma
• Dash joining two full sentences → period, capitalized automatically
• Number ranges → plain hyphen
• Attribution dashes ("— Oscar Wilde") → kept

PRIVATE BY DESIGN
• No permissions requested. No data collected. No network requests.
• Files are processed in the browser tab and never leave your computer.
• Word (.docx) files are read and rebuilt locally.

Also catches en dashes, minus signs, and double hyphens if you want the whole dash family.

Open source (MIT): https://github.com/WintermuteEntertainment/emdash-filter
A command-line version is included in the repo for terminal users.