Conversion Utilities

Decimal To Hexadecimal

Converts decimal integers to hexadecimal format with deterministic precision. Available through MCP in Cursor, Windsurf, and other AI coding tools via GET /v1/convert/base/dec-to-hex, or as a REST API. Input 255, get "FF". Handles negative numbers and large integers without floating-point errors that can plague JavaScript's toString(16) method.

API Endpoint

GET /v1/convert/base/dec-to-hex

Code Examples

curl "https://tinyfn.io/v1/convert/base/dec-to-hex" \
  -H "X-API-Key: YOUR_API_KEY"

const response = await fetch('https://tinyfn.io/v1/convert/base/dec-to-hex', {
  headers: { 'X-API-Key': 'YOUR_API_KEY' }
});
const data = await response.json();
console.log(data);

import requests

response = requests.get('https://tinyfn.io/v1/convert/base/dec-to-hex',
    headers={'X-API-Key': 'YOUR_API_KEY'})
data = response.json()
print(data)

Use via MCP

Add to your AI agent

Connect your AI agent (Claude, Cursor, Windsurf, etc.) to TinyFn's conversion tools:

{
  "mcpServers": {
    "tinyfn-conversion": {
      "url": "https://tinyfn.io/mcp/conversion",
      "headers": {
        "X-API-Key": "YOUR_API_KEY"
      }
    }
  }
}

Learn more about MCP setup →

Related Tools

FAQ

How do I convert decimal to hex using MCP in my AI coding assistant?

Call the decimal-to-hexadecimal tool with your decimal number. The MCP tool handles the conversion automatically and returns the hex string.

Does this handle negative decimal numbers correctly?

Yes, negative decimals convert to proper hexadecimal representation. For example, -255 becomes "-FF".

What's the difference between this and JavaScript's toString(16)?

This tool provides deterministic results for large integers and edge cases where JavaScript's native conversion might have precision issues or inconsistent behavior.

Can I convert very large decimal numbers to hexadecimal?

Yes, the tool handles arbitrarily large integers without the precision limits of standard programming language number types.

What format does the hexadecimal output use?

Returns uppercase hexadecimal strings without prefixes (e.g., "1A3F" not "0x1A3F"). Negative numbers include the minus sign.

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