How to Convert ICO to SVG: Step-by-Step Tutorial

By Bill Crawford  ·  March 2026  ·  6 min read  ·  Last updated March 6, 2026

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What You Will Learn

This tutorial walks you through converting one or more ICO icon files to SVG format using the free browser-based tool at Data Conversion Center. You will learn how to upload files, understand what happens during conversion, download your SVG output individually or as a ZIP, and deploy the resulting SVG files in common web and design scenarios.

No software installation is required. Everything runs in your browser — your icon files never leave your device.

Before You Start

A few things to confirm before opening the tool:

• File type. You need .ico files. These are typically named favicon.ico, application icon files from Windows software, or exports from icon design tools.
• Browser. Any modern browser works — Chrome, Firefox, Edge, or Safari. The tool uses the browser's built-in ICO decoder, so no plugins or extensions are needed.
• Purpose. If you need SVG favicons, batch conversion of a legacy icon set, or import into a design tool, this workflow is for you. If you need Windows application icons, keep the original ICO files.

Step 1: Open the ICO to SVG Converter

Navigate to dataconversioncenter.com/image-tools/ico-to-svg/. You will see a drop zone at the top of the tool, a ZIP mode option, and the Convert to SVG button (initially disabled until files are loaded).

Step 2: Upload Your ICO Files

You have two ways to add files:

• Drag and drop. Drag one or more .ico files directly onto the drop zone. The zone highlights in blue to confirm it is active. Release to add the files.
• Browse Files. Click the Browse Files link or anywhere on the drop zone to open your system file picker. Select one or multiple .ico files and confirm.

After adding files, you will see an Input Files section appear below the drop zone. Each file is represented as a card with a thumbnail preview, the file name, and its file size. The thumbnails are generated immediately from the ICO's embedded image data — if a thumbnail shows a blank or black square, the ICO may have been created with an older encoder that does not include a high-resolution PNG frame.

You can continue adding more files by dropping or browsing again — new files are appended to the existing batch.

Step 3: Choose Download Mode (Optional)

Just below the drop zone, there is a Download as ZIP checkbox.

• Unchecked (default). Each converted SVG can be downloaded individually by clicking the download button on its output card. The Download All SVGs button at the bottom triggers sequential individual downloads.
• Checked. All converted SVGs are packed into a single ZIP archive named dataconversioncenter_ico_to_svg_YYYYMMDDHHMM.zip using your local timestamp.

For single-file conversions, individual mode is simpler. For batch conversions of five or more files, ZIP mode is more convenient.

Step 4: Convert

Click the Convert to SVG button. The tool processes files in pairs (two at a time) to keep the UI responsive. A progress bar shows how many files have been converted. Each input card's status badge updates from Ready → Converting… → Converted (or Error if a file cannot be decoded).

The conversion steps for each file are:

1. The browser decodes the ICO file and renders the highest-resolution frame to an HTML canvas element.
2. The canvas is exported as a base64-encoded PNG string via the Canvas API.
3. The base64 PNG is wrapped inside an SVG document with matching width, height, and viewBox attributes.
4. The SVG is stored in memory, ready for download.

When all files are done, a green summary banner confirms success (or shows a count of failures if any files errored).

Step 5: Download Your SVG Files

After conversion, the Output Files section appears with a card for each converted SVG. Each card shows a thumbnail preview, the output file name (original name with .svg extension), and the file size.

• Individual download. Click the ⬇ Download SVG button on any card to save that file.
• Download All SVGs. Click the bulk download button to trigger individual downloads for every converted file.
• Download ZIP. If you enabled ZIP mode, clicking the bulk download button generates a ZIP archive of all SVGs and triggers a single download.

After downloading, click Start Over to reset the tool and clear all loaded files from memory.

Step 6: Deploy Your SVG Files

As an SVG Favicon

Place the converted SVG in your website's root directory and add the following to your HTML <head>. Keep your original favicon.ico as a fallback for Internet Explorer:

<link rel="icon" href="/favicon.svg" type="image/svg+xml">
<link rel="icon" href="/favicon.ico" sizes="any">

In CSS as a Background Image

Reference the SVG in your stylesheet. SVG scales with the element's dimensions automatically — no need for separate 1× and 2× files:

.icon-logo {
  background-image: url('/icons/logo.svg');
  background-size: contain;
  background-repeat: no-repeat;
  width: 48px;
  height: 48px;
}

In HTML as an img Element

SVGs can be used as standard <img> sources. The width and height attributes control the display size:

<img src="/icons/app-icon.svg" alt="Application icon" width="32" height="32">

Importing into Figma or Sketch

Drag the SVG file directly onto the Figma or Sketch canvas, or use File → Import. The icon will appear as an image element. You can resize it freely and use it as a reference when creating true vector paths — right-click and select "Flatten" or "Outline Stroke" options in your tool of choice to begin building a path-based version.

Troubleshooting

The thumbnail appears blank or black. The ICO file may only contain very small frames (16×16 or 32×32) from an older encoder. The conversion still works — the SVG will contain the best available frame. Check the output size to confirm.

The status badge shows "Error". The file may be corrupted, or the .ico extension may have been applied to a non-ICO file. Try opening the file in Windows Explorer or another image viewer to confirm it is a valid ICO.

The SVG looks blurry at large sizes. This is expected when the source ICO only contained small frames. For crisp large-scale SVG output, you will need to retrace the icon as vector paths in a tool like Inkscape, Illustrator, or Figma using the converted SVG as a reference layer.