Convert Any Number to Written Words

Number to Words API.

Convert numeric values to their written word equivalents. Get both cardinal (one hundred) and ordinal (one hundredth) forms. Perfect for check writing, legal documents, invoices, and text-to-speech applications.

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Free tier, no card< 200ms responses99.9% uptime SLA

GET/v1/numbertowordslive

query

Response200 OK · sample

{
  "status": "ok",
  "error": null,
  "data": {
    "number": 975.07,
    "words": "nine hundred seventy-five point zero seven",
    "ordinal": "nine hundred seventy-fifth point zero seven",
    "numberOfDigits_numeric": 3,
    "numberOfDigits_words": "three",
    "eachNumber": [
      "nine",
      "seven",
      "five"
    ],
    "afterDecimal": {
      "number": "07",
      "words": [
        "zero",
        "seven"
      ],
      "numberOfDigits_numeric": 2,
      "numberOfDigits_words": "two"
    },
    "locale": "en-US"
  }
}

Sample response · verify to run one live call, no signup

How it works

Number to Words API

Convert numbers to readable text instantly
Both cardinal and ordinal forms
Support for large numbers
Fast response for real-time applications

1
Send one request
A single authenticated GET with the location you care about — no SDK required.
```
GET /v1/numbertowords?query=…
x-api-key: your_key
```
2
We do the aggregation
Each request pulls from multiple upstream sources and computes the derived fields for you.
3
Get clean JSON back
One structured object, typically under 200 ms — ready to render.
```
{ number, words, ordinal, … }
```

The response

Everything in a single call.

/v1/numbertowordsapplication/json

number975.07

words"nine hundred seventy-five point zero seven"

ordinal"nine hundred seventy-fifth point zero seven"

numberOfDigits_numeric3

numberOfDigits_words"three"

eachNumberarray of 3

afterDecimalnumber, words, numberOfDigits_numeric, numberOfDigits_words

locale"en-US"

Use cases

What developers build with it.

Real applications shipping on this endpoint today — each with the numbers that made it worth wiring up.

See every use case

Automated Check Writing

Automatically convert check amounts to their word form. Ensure accuracy and prevent fraud by matching numeric and written amounts.

Eliminate conversion errorsSpeed up check generationFraud prevention through verification

Zeroconversion errors

Automatedcheck generation

Fraudprevention

Legal Document Generation

Automatically convert all numbers in legal documents to their written equivalents. Ensure clarity and reduce disputes over numeric values.

Eliminate ambiguity in contractsAutomate document generationReduce legal disputes

Clearlegal language

Reduceddisputes

Automateddocument creation

Start coding

Call it in your language.

Copy a working request, or install a typed SDK. Same endpoint, same key.

const res = await fetch("https://api.apiverve.com/v1/numbertowords?number=975.07", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Included in your key

One subscription, the whole convert any number to written words stack.

Every related API ships with your key — no separate plans, no extra keys, one bill.

See pricing

8APIs in this bundle

99.9%uptime SLA

The bundle

numbertowordsYou’re hereromanconverter passwordgenerator randomgenerator spellchecker wordstonumbers dictionary translator

No code required

Wire it into the tools you already run.

Ready-made recipes for Zapier, Make, and n8n — trigger on an event, and the data lands where your team works.

Google Sheets

Convert Numbers to Words in Google Sheets

WhenNew row added in Google Sheets

ThenFetch number to words for numeric column → write words and ordinal values back to the row

Slack

Number Conversion Bot in Slack

WhenNew message posted in Slack channel

ThenFetch number to words for the number → reply with words and ordinal forms

Airtable

Number-to-Words Enrichment in Airtable

WhenNew record created in Airtable

ThenFetch number to words for amount field → update record with words and ordinal values

Notion

Written Amounts in Notion Database

WhenNew page created in Notion

ThenFetch number to words for amount property → update page with words and ordinal

Salesforce

Written Amounts on Salesforce Opportunities

WhenNew opportunity created in Salesforce

ThenFetch number to words for opportunity amount → update custom field with words value

GitHub

Release Version in Words on GitHub

WhenNew release created in GitHub

ThenFetch number to words for version number → add words to release description

Browse all integrations

Learn

Understand the data behind the API.

Cardinal vs Ordinal Numbers

Understand the difference between cardinal and ordinal number forms and when to use each.

Check Writing Conventions

Learn the standard conventions for writing monetary amounts in words on checks and legal documents.

Number System Basics

Understanding how different number systems represent values and convert between forms.

Questions about the API

What is the maximum number supported?

The API handles numbers up to the quadrillions and beyond. For extremely large numbers, scientific notation may be more practical.

Does it handle decimal numbers?

Yes, decimal numbers are converted with the fractional part spelled out (e.g., "one point five").

What is the difference between cardinal and ordinal?

Cardinal numbers represent quantity (one, two, three). Ordinal numbers represent position or order (first, second, third).

Does it support negative numbers?

Yes, negative numbers are prefixed with "negative" (e.g., "negative five").

What languages are supported?

Currently the API returns English word forms. Additional language support may be added in future updates.

Is it suitable for financial applications?

Yes, the API is commonly used for check writing and invoice generation where amounts must be written in words.

Start building with the Number to Words API. Free tier, no card required — your key is live in minutes.

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