AI ToolsFree

AI Grammar Fixer

Fix grammar, spelling, punctuation, and style issues in any text using Claude AI. Get explanations for each correction so you can learn and improve.

API Setup Required

AI tools need a backend API route to work. This prevents CORS errors from calling Anthropic directly from the browser.

Quick Setup (3 steps)

1

Create API route

app/api/ai/route.ts
2

Add your API key

.env.local → ANTHROPIC_API_KEY=sk-ant-...
3

Enable in component

AIToolBase.tsx → AI_ENABLED = true
app/api/ai/route.tsCopy & paste
import Anthropic from "@anthropic-ai/sdk";
import { NextRequest, NextResponse } from "next/server";

const client = new Anthropic({
  apiKey: process.env.ANTHROPIC_API_KEY,
});

export async function POST(req: NextRequest) {
  const { system, prompt } = await req.json();
  const msg = await client.messages.create({
    model: "claude-sonnet-4-20250514",
    max_tokens: 1024,
    system,
    messages: [{ role: "user", content: prompt }],
  });
  const text = msg.content[0].type === "text"
    ? msg.content[0].text : "";
  return NextResponse.json({ text });
}

Frequently Asked Questions

Is the grammar fixer accurate?▼
Yes. Claude AI understands context and corrects errors accurately, including complex grammar rules.
Does it work for non-native English speakers?▼
Absolutely. It's especially useful for improving clarity and naturalness in English writing.