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Humanizer API
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Developer API

Humanize AI text with a single API call

Rewrite AI-generated drafts into natural, human-sounding text and check AI likelihood from your own code. One REST endpoint, simple word-based plans, and a dashboard for keys and usage.

Get API keyRead the docs
  • Free trial words included
  • Your text is never stored
  • Test keys for CI
POST https://api.humanizertool.io/v1/humanize
curl https://api.humanizertool.io/v1/humanize \
  -H "Authorization: Bearer $HUMANIZER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Artificial intelligence has fundamentally transformed the way organizations approach content creation, enabling unprecedented efficiency.",
    "style": "business"
  }'
200 OKResponse
{
  "id": "hum_oJoMouByloZk",
  "object": "humanize",
  "output": "AI has changed how teams write. Work that took days now takes an afternoon.",
  "words_in": 16,
  "words_out": 15,
  "style": "business",
  "usage": {
    "words_used": 1240,
    "words_limit": 100000,
    "words_remaining": 98760,
    "period_end": "2026-11-30T08:25:17.000Z"
  },
  "request_id": "req_8e2d4f6a1b3c5d7e9f0a2b4c"
}

How it works

From sign-up to first response in minutes

  1. Step 1

    Create a key

    Sign up with email or Google and create a live or test key in the dashboard. The secret is shown once — store it in your server's environment.

    ht_live_Ab3x…
  2. Step 2

    Call the API

    Send your text to POST /v1/humanize with a Bearer header. Pick a style, length and similarity, or just use the defaults.

    POST /v1/humanize
  3. Step 3

    Track usage

    Every response includes words remaining and rate-limit headers. The dashboard shows usage by day, key and endpoint, plus request logs.

    X-Words-Remaining

Features

Everything you need to ship it

A focused API with the tooling around it: keys, limits, logs and a playground.

  • Humanize + detect

    Rewrite AI text in seven styles with length and similarity controls, then score any text for AI likelihood with sentence-level flags.

  • Word-based plans

    One pool of words per month for both endpoints. No credits to convert and no surprise overages — over the limit, a request is simply refused.

  • Test keys

    ht_test_ keys return deterministic stub responses and are never metered. Wire up CI and staging without spending a single word.

  • Usage dashboard

    Charts by day, key and endpoint, request logs with latency and request ids, and quota meters that match the API headers.

  • Playground

    Try every option in the browser before writing code. Inputs and outputs side by side, with the exact request you can copy.

  • No text stored

    Your text is processed and returned, never saved. We keep request metadata only — counts, status and timings — for your logs.

Pricing

Simple plans, priced by the word

Pay monthly for a pool of words shared by humanize and detect. Upgrade, downgrade or cancel any time.

  • Free trial

    Free

    No card required

    2,000 words one-time

    • 2,000 words to test
    • humanize + detect
    • test keys
    Start free

  • Starter

    $29/ month

    $0.29 per 1,000 words

    100,000 words / month

    • 100,000 words / month
    • 1,500 words per request
    • 30 requests / minute
    • 2 live keys
    Choose Starter
  • Most popular

    Growth

    $99/ month

    $0.20 per 1,000 words

    500,000 words / month

    • 500,000 words / month
    • 3,000 words per request
    • 60 requests / minute
    • 5 live keys
    Choose Growth

  • Scale

    $249/ month

    $0.17 per 1,000 words

    1,500,000 words / month

    • 1,500,000 words / month
    • 5,000 words per request
    • 120 requests / minute
    • 10 live keys
    Choose Scale

  • Enterprise

    $499/ month

    $0.12 per 1,000 words

    4,000,000 words / month

    • 4,000,000 words / month
    • 6,000 words per request
    • 240 requests / minute
    • Unlimited keys
    • Priority processing
    Contact us

    Custom volumes and invoicing available

FAQ

Frequently asked questions

Start humanizing in the next five minutes

Create a free account, grab a key and send your first request. Trial words are on us.

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