I built a free text rewriter with no word limits — uses GPT-4o, not a proprietary model

#javascript #webdev #opensource #productivity

Every paraphrasing tool online has the same problem: word limits.

QuillBot caps you at 125 words on the free tier. Grammarly makes you sign up. Scribbr puts a banner over your output. They all use their own proprietary models that are... fine. Not great.

So I built an alternative that uses GPT-4o or Gemini — the actual frontier models — and has no word limits at all.

AI Text Rewriter — Free, BYOK, No Limits

How it works

Paste your API key (OpenAI or Google Gemini)
Paste your text
Pick a style: Standard, Formal, Casual, Simpler, Shorter, Expand, or Academic
Hit Rewrite

That's it. The rewrite uses whichever model you selected. GPT-4.1 Nano costs about $0.001 per rewrite. GPT-4o costs maybe $0.01 for a long paragraph. No word limits, no signup.

Why BYOK matters here

QuillBot uses its own model. It's decent for basic paraphrasing but falls apart on nuanced text — academic writing, technical docs, anything with domain-specific language.

GPT-4o and Gemini 2.5 Pro are just better at this. They understand context, preserve meaning, and produce natural-sounding output. The tradeoff: you need an API key. But if you already have one (and most developers do), this is strictly better.

The build

One HTML file. 31KB. Everything runs in your browser — your text goes directly to OpenAI or Google, never to my servers. No backend, no database, no tracking.

I also built an AI Agent Builder with the same BYOK approach — paste a key, define a goal, watch an autonomous agent work through it.