Text that lands exactly how you mean it.

ToneShift is a lightweight transformation engine. Paste raw input and instantly get professional, casual, humanized, or prompt-ready versions — plus clear AI detection.

Open ToneShift Explore modes

No build step Runs in browser Bring your Groq key

Input — raw draft

“hey can you make this sound more professional for my boss? i need to tell him the project is delayed but we’re on it”

31 words · pasted as is

Output — professional

Hi Alex — quick update on the timeline. The project is running slightly behind schedule, but we’re actively addressing the blockers and will share a revised plan shortly.

Generated in 1.2s · ready to copy

Five modes

One input, five precise outputs.

Built for real writing — client updates, social copy, human-sounding drafts, structured prompts, and verification. No fluff, just the right voice.

Professional

Turn rough drafts into business-ready copy for executives, clients, and formal documents. Clear, concise, and credible.

Executive readyFormal tone

Casual / Gen-Z

Relax stiff writing into natural, friendly conversation that sounds like a real person — without losing meaning.

ConversationalApproachable

Humanize

Strip predictable AI cadence, vary sentence rhythm, and remove telltale patterns so text reads as authentically human.

Bypass detectionNatural rhythm

AI Agent Prompt

Expand a vague idea into a detailed, structured prompt with context, constraints, and success criteria for any agent.

StructuredHigh success rate

AI Detector

Analyze writing patterns to estimate the probability of AI generation, with confidence scoring and a clear verdict.

Probability scoreConfidence %

Input limit

5,000 characters

Word and character count with live feedback. Markdown rendered in output.

Latency

Groq-speed inference

GPT-OSS 120B delivers fast, high-quality rewrites without queue delays.

Deploy

Vercel Serverless

Vanilla HTML/CSS/JS frontend. One serverless function. No framework tax.

How it works

Three steps. No learning curve.

Designed to stay out of your way. Paste, pick a tone, and copy the result.

01 — Paste

Drop in your text

Paste up to 5,000 characters. Use clear, paste, and live counts to stay in control.

02 — Choose

Select a mode

Professional, Casual, Humanize, AI Prompt, or Detector. Switch instantly.

03 — Copy

Transform and copy

Run with Ctrl + Enter and copy the result. Meaning preserved, tone fixed.

Stack and API

Minimal dependencies. Ready to integrate.

Use the app or call the same endpoint from your own product. One shape for every mode.

Frontend — Vanilla HTML, CSS, and JavaScript. No build step, fast by default.

Backend — Node.js Vercel Serverless Function at /api/transform.

Inference — GPT-OSS 120B via Groq. Set GROQ_API_KEY in Vercel or .env.local.

POST /api/transform

JSON

Request
{
  "text": "String to be transformed",
  "tone": "professional | casual | humanize | prompt | detector"
}

Response
{
  "success": true,
  "text": "Transformed text here"
}

Content-Type: application/json CORS ready

Start transforming in seconds.

Open the app, paste your text, and pick a tone. No signup, no build step — just your Groq key.

Open ToneShift How it works