ICO to SVG Converter

What does the ICO to SVG Converter do?

The ICO to SVG Converter transforms Windows Icon files (.ico, .cur) and favicon assets into scalable, XML-compliant SVG vector files (.svg) and Base64 Data URIs (data:image/svg+xml;utf8,...). It parses ICONDIR headers and multi-resolution ICONDIRENTRY frame tables (16x16, 32x32, 48x48, 64x64, 128x128, 256x256) to extract intrinsic dimensions and bit depths, generating responsive <svg> vector containers with configurable viewBox coordinates, resolution scaling presets, custom dimension overrides, and optional background color fills.

Core Concepts

• ICO Specification: Windows Icon (ICO) is an image container format that bundles multiple icon frames at different pixel dimensions and bit depths in a single binary file.
• SVG Vector Encapsulation: Scalable Vector Graphics (SVG) is an XML-based vector format. By embedding favicon and desktop app icon bitstreams into responsive SVG wrappers, developers can scale small website favicons into crisp, high-DPI display assets across fluid responsive websites.
• Resolution Scaling & Retina Export: Export graphics at 1x, 2x Retina, 3x, or 4x print quality multipliers, or enforce exact pixel width and height boundaries.
• Background Matte Composition: Preserve transparent alpha channels or composite the graphic over solid white, dark navy, or custom hex color fills.

How to use the tool?

1. Upload or Paste Input: Drag & drop an .ico or .cur file into the drop zone or paste a Base64-encoded Data URI string into the text editor.
2. Configure Resolution Scale & Dimensions: Select a scale preset (1x, 2x, 3x, 4x) or enter explicit width and height values in pixels.
3. Select Background Fill: Choose transparent alpha or select a solid background color (white, dark navy, or custom hex code).
4. Convert to SVG: Click Convert to SVG to process the image and render the vector preview.
5. Download or Copy: Click Download to save the standalone .svg vector document, or copy the SVG code for direct HTML, React, or CSS embedding.

Related Developer Utilities

• SVG to PNG Converter
• ICO to PNG Converter
• ICO to JPG Converter
• PNG to SVG Converter
• JPG to SVG Converter

REST API Integration

blueutils.com provides a free REST API endpoint (POST https://blueutils.com/api/image/ico-to-svg) for programmatic image vector generation.

API Request Parameters

API Request Payload Examples

cURL

curl -X POST https://blueutils.com/api/image/ico-to-svg \
  -H "Content-Type: application/json" \
  -d '{ "rawText": "data:image/x-icon;base64,AAABAA...", "options": { "scale": 1, "bgColor": "transparent" } }'

Python

import requests

url = "https://blueutils.com/api/image/ico-to-svg"
payload = {
    "rawText": "data:image/x-icon;base64,AAABAA...",
    "options": {"scale": 2, "bgColor": "transparent"}
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.json())

Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        String jsonPayload = "{\"rawText\": \"data:image/x-icon;base64,AAABAA...\", \"options\": {\"scale\": 1}}";
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://blueutils.com/api/image/ico-to-svg"))
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
            .build();
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.body());
    }
}

API Response Parameters

API Response Payload Examples

Success Response (HTTP 200 OK)

{
  "isValid": true,
  "mimeType": "image/svg+xml",
  "originalFormat": "image/x-icon",
  "svg": "<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 64 64\" width=\"128\" height=\"128\"><image width=\"64\" height=\"64\" href=\"data:image/x-icon;base64,...\"/></svg>",
  "dataUri": "data:image/svg+xml;utf8,%3Csvg...",
  "metadata": {
    "originalWidth": 64,
    "originalHeight": 64,
    "targetWidth": 128,
    "targetHeight": 128,
    "scale": 2,
    "bgColor": "transparent",
    "bitDepth": 32,
    "frameCount": 1,
    "aspectRatio": 1.0,
    "originalSizeBytes": 742,
    "formattedSize": "742 B"
  }
}

Validation Failure Response (HTTP 400 Bad Request)

{
  "isValid": false,
  "error": "ICO image payload cannot be empty. Please upload an ICO file or provide a Base64 string."
}

Rate Limit Exceeded Response (HTTP 429 Too Many Requests)

{
  "error": "API rate limit exceeded. Please wait or contact support@blueutils.com."
}

Why use an API to convert ICO to SVG?

Integrating the ICO to SVG API into CI/CD build steps, favicon management workflows, or automated agent pipelines provides concrete advantages:

• Automated Vector Packaging: Programmatically wrap multi-resolution Windows ICO favicons into responsive SVG files for modern web frameworks and UI design components.
• Optimized Token Efficiency for AI Agents: Offload binary image parsing and XML construction to a fast, deterministic endpoint.
• Deterministic Accuracy Without Hallucinations: Ensures valid XML syntax, exact ICO dimension extraction, and valid MIME headers without LLM hallucination risks.

Native Usage

Convert ICO files into SVG vector wrappers locally using native operating system utilities and standard libraries:

Windows (PowerShell)

# Wrap ICO into an SVG document using PowerShell
$icoBytes = [System.IO.File]::ReadAllBytes("favicon.ico")
$base64 = [System.Convert]::ToBase64String($icoBytes)
$svg = @"
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 256 256" width="256" height="256">
  <image width="256" height="256" href="data:image/x-icon;base64,$base64"/>
</svg>
"@
[System.IO.File]::WriteAllText("output.svg", $svg)
Write-Output "Converted favicon.ico to output.svg successfully"

Linux / Unix (Bash)

# Wrap ICO into an SVG document using Bash and base64
BASE64_DATA=$(base64 -w 0 favicon.ico)
cat <<EOF > output.svg
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 256 256" width="256" height="256">
  <image width="256" height="256" href="data:image/x-icon;base64,${BASE64_DATA}"/>
</svg>
EOF
echo "Converted favicon.ico to output.svg successfully"

Python

# Standard library Python conversion
import base64

with open("favicon.ico", "rb") as f:
    b64_data = base64.b64encode(f.read()).decode("utf-8")

svg_content = f"""<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 256 256" width="256" height="256">
  <image width="256" height="256" href="data:image/x-icon;base64,{b64_data}"/>
</svg>"""

with open("output.svg", "w", encoding="utf-8") as f:
    f.write(svg_content)

print("Converted favicon.ico to output.svg successfully")

Java

// Standard library Java conversion
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Base64;

public class IcoToSvg {
    public static void main(String[] args) throws Exception {
        byte[] bytes = Files.readAllBytes(Paths.get("favicon.ico"));
        String b64 = Base64.getEncoder().encodeToString(bytes);
        String svg = "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" viewBox=\"0 0 256 256\" width=\"256\" height=\"256\">\n" +
                     "  <image width=\"256\" height=\"256\" href=\"data:image/x-icon;base64," + b64 + "\"/>\n" +
                     "</svg>";
        Files.writeString(Paths.get("output.svg"), svg);
        System.out.println("Converted favicon.ico to output.svg successfully");
    }
}