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AI Humanizer APIで

最先端のAPIを使ってAIコンテンツを検出し、人間らしく変換しましょう。

Starting at $0.10 per 1K words.

View Pricing View Documentation
const res = await fetch("https://v2-humanizer.rephrasy.ai/api/", {
  method: "POST",
  headers: {
    "Authorization": "Bearer <your-api-key>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    text: "AI-generated text here.",
    model: "v3",
    words: true
  })
});

const data = await res.json();
// => { output: "Humanized text...", costs: { total: 1.5 } }
200 OKREST API v1
Text HumanizerText DetectorImage Humanizer

API usage

1
NEW

モデル v3 — 高度なスタイルオプションを備えたGPTZero向け最高のモデル

新しいモデルとその使い方について詳しく読む →

API Parameters


Required Parameters:
 - text (string): The AI-generated text to humanize
 - model (string): "v3" (recommended), "Undetectable Model v2", "Undetectable Model", "SEO Model", or Writing Style ID

Optional Parameters:
 - style (string): Optional writing style for v3 model — "creative", "journalistic", or "professional". If omitted, v3 uses its default behavior.
 - words (boolean): Enable word-based pricing (default: false)
 - costs (boolean): Return cost information (default: false)
 - language (string): Language name (e.g., "English", "German", "French", "Spanish")
                     If not provided, language will be auto-detected

Supported Languages:
 - English        - German         - French
 - Spanish        - Italian        - Portuguese
 - Dutch          - Polish         - Japanese
 - And many more...

Humanizer API Response Example


Response Codes
 - 200 OK: Request successful; scores returned.
 - 422 Bad Request: Invalid input (e.g., missing parameters).
 - 401 Unauthorized: Invalid API key.

 Example Response

{
  "output": "Rephrasy is a service that delivers paraphrasing of AI written text.",
  "new_flesch_score": 68.77
}

 Flesch Score Interpretation:
 - The Flesch score measures readability. Higher scores indicate easier-to-read text.
 - Range: 0-100. A score of 60-70 is easily readable for 13- to 15-year-olds.
 - A higher score often means simpler language.

ぜひご覧ください
Detector APIを

API usage

1

Detector API Response Example


Response Codes
 - 200 OK: Request successful; scores returned.
 - 422 Bad Request: Invalid input (e.g., missing parameters).
 - 401 Unauthorized: Invalid API key.

 Example Response (Depth Mode)
{
  "text": "Example text.",
  "sentences": { "Example text.": 5.5 },
  "scores": { "overall": 1.4 }
}

 Score Interpretation:
 - Overall Score: Ranges from 0 (human) to 100 (AI).
 - Sentence Scores (mode = "depth"): 0 is human, 100 is AI.
 - Other modes: 100 indicates human, 0 indicates AI.

What You Can Build

Developers and agencies use the Rephrasy API to power their own products and workflows.

Bulk Content Pipelines

Process hundreds of articles or documents in parallel. Integrate into your existing content workflow via a single POST request.

SaaS Products

Build your own AI humanizer tool on top of Rephrasy. White-label the API or offer it as a feature inside your product.

Browser Extensions

Call the API from a Chrome extension to humanize text inline — directly on Google Docs, WordPress, or any web editor.

Agency Automation

Connect Rephrasy to Zapier, Make, or n8n to automatically humanize AI drafts before they hit your CMS or client delivery.

NEWsynthid-humanizer.rephrasy.ai

Image Humanizer API

Remove invisible AI watermarks (SynthID, StableSignature), detect AI provenance, and humanize images programmatically. Supports single images and batches up to 100.

10 credits / imageSame credit balance as text API

Authentication

Authorization: Bearer <your-api-key>

Website key = high-priority queue · User API key = normal queue

Credits

Credits are deducted at batch submission. Insufficient balance → 402 error, no images processed. Batches auto-delete after 24 hours.

Also available

GET/batches/{id}
GET/batches/{id}/download
POST/remove/visible
POST /batches
# 1 — Submit batch
curl -X POST https://synthid-humanizer.rephrasy.ai/batches \
  -H "Authorization: Bearer <your-api-key>" \
  -F "files=@photo1.png" \
  -F "files=@photo2.jpg"

# => { "batch_id": "a3f9c2b1", "job_count": 2, "status": "queued" }

# 2 — Poll until done (every 5–10 s)
curl https://synthid-humanizer.rephrasy.ai/batches/a3f9c2b1 \
  -H "Authorization: Bearer <your-api-key>"

# => { "status": "done", "done": 2, "total": 2, "download_ready": true }

# 3 — Download ZIP (batch deleted after this)
curl -O https://synthid-humanizer.rephrasy.ai/batches/a3f9c2b1/download \
  -H "Authorization: Bearer <your-api-key>"
200 OKImage API v1

Batch status values

queuedWaiting in queue — queue_position shows place
processingGPU is working on this batch
doneAll images finished, ready to download
failedProcessing failed — check per-job error field

Error codes

400No files / more than 100 files
401Missing or invalid API key
402Insufficient credits
404Batch not found or already downloaded
425Batch not done yet (too early to download)

Bulk Credits — Unbeatable API Pricing

No per-seat fees, no rate limits. Buy credits once, use them any time. The more you buy, the cheaper each request gets.

5,000

credits

$275

$0.0550 / credit

100k words for $11.00
Most Popular

10,000

credits

$500

$0.0500 / credit

100k words for $10.00

20,000

credits

$950

$0.0475 / credit

100k words for $9.50

50,000

credits

$2,250

$0.0450 / credit

100k words for $9.00

* Based on 100 × 1,000-word requests with word-based pricing enabled (2 credits each = 200 credits total)

Real cost — humanizing 100,000 words

100 requests of 1,000 words each, word-based pricing enabled (words: true):

Rephrasy API (10K bulk)

$10.00

$0.10 per 1K words — no subscription, no monthly cap

WriteHuman Premium

$17.25

$69/mo plan pro-rated for 100K of 400K words

Undetectable AI Premium

$47.25

$15.75/mo × 3 months needed for 100K words

* Competitor prices based on publicly listed plans. WriteHuman: $69/mo Premium. Undetectable AI: $15.75/mo Premium (35K words/mo).

Ready to integrate?

Sign up, subscribe to any plan, and find your API key in your account dashboard. Start making requests in minutes.

Get API KeyAPIドキュメント

開発者向けに設計されたAI Humanizer API

AI Humanizer APIは、大量のAI生成コンテンツを人間らしくしたい開発者向けに設計されています。このAPIはシンプルで、高速で、信頼性があります。APIのみのプランについては、直接お問い合わせください！

  • Rephrasyでサブスクリプションを取得

    強力なAPIでコンテンツを即座に言い換えます。

  • Rephrasy AI Detectorを使用

    スケールに合わせた強力なAI検出ツールでAIコンテンツを検出します。

  • AI DetectorとHumanizerを組み合わせて最高の結果を

    RephrasyのAI検出ツールとHumanizerを一緒に使って最高の結果を得ましょう。

今すぐ始める

AIテキストを人間のテキストに変換 — 無料AI Humanizer

125,000人以上の学生・専門家に信頼される#1 AI Humanizer