SVG to ICO converter

SVG to ICO rasterizes vector art and stores one thumbnail-sized icon entry, so it is not yet a full multi-size favicon generator.

Converted with Image engine · nothing stored
Free: 5 conversions a day · 5 MB each
Higher limits →

From real runs

What you get — and what changes

Element	Result	What happens
Icon entries	Changed	The 320×180 SVG wrote a 13,874 byte ICO containing one 256×144 RGBA entry, not 16, 32, 48, and 256 sizes.
Aspect ratio	Kept	Our image engine thumbnailed the wide SVG to fit within 256 pixels, so the ICO entry stayed 16:9 rather than square.
Transparency	Kept	The ICO entry opened as RGBA, so transparent regions from the SVG raster survived the icon save.
Vector scalability	Lost	Once inside ICO, the SVG paths are just bitmap pixels at the single stored size.
Inline SVG style	Kept	Embedded style rules were applied before the icon was generated, matching the colors from the SVG preview run.
Small favicon sizes	Lost	Browsers or Windows cannot choose 16×16 or 32×32 renditions because this output did not include them.

Icon entries Changed
The 320×180 SVG wrote a 13,874 byte ICO containing one 256×144 RGBA entry, not 16, 32, 48, and 256 sizes.
Aspect ratio Kept
Our image engine thumbnailed the wide SVG to fit within 256 pixels, so the ICO entry stayed 16:9 rather than square.
Transparency Kept
The ICO entry opened as RGBA, so transparent regions from the SVG raster survived the icon save.
Vector scalability Lost
Once inside ICO, the SVG paths are just bitmap pixels at the single stored size.
Inline SVG style Kept
Embedded style rules were applied before the icon was generated, matching the colors from the SVG preview run.
Small favicon sizes Lost
Browsers or Windows cannot choose 16×16 or 32×32 renditions because this output did not include them.

Sample conversions

Wide SVG mark

Input: 640 byte transparent SVG at 320×180 with a panel, circle, curve, and text.
Output: 13,874 byte ICO with one 256×144 RGBA image. It was not a square favicon and did not include smaller entries.

Missing font SVG

Input: Same SVG with font-family set to a deliberately unavailable brand font.
Output: The text was already fallback-rendered before icon packaging, so fixing the ICO later would require returning to the SVG.

A real SVG → ICO run

We converted our SVG sample (389 B) with Image engine on 2026-10-20. It took 17 ms and produced a 5 KB ICO file, 14× larger than the input. The engine raised 1 warning, listed below.

Input · sample.svg · 389 B

SVG viewBox 0 0 320 200, 0 paths

viewBox: 0 0 320 200
Paths: 0

Output · sample.ico · 5 KB

256 × 160 px, 1 size: 256×160

Width: 256
Height: 160
Encoding: 1 size: 256×160

Image metadata stripped from output.

Options and when to change them

width: Render the SVG to a square width before ICO output when the source viewBox is not already icon-shaped.
height: Set with width to force a square raster before the final max-256 thumbnail step.
fit: Use cover only when cropping wide art is better than a non-square icon entry.

Do it yourself

ImageMagick 7

bash

magick in.svg -background none -define icon:auto-resize=256,48,32,16 favicon.ico

This command creates the multi-size ICO that the current API output did not create in our test.

SVG to ICO by API or MCP

The HTTP API and the MCP server run the exact engine this page uses (Image engine); the response carries the same warnings the web converter shows. Check support first with GET /api/v1/pairs?from=svg&to=ico.

curl

curl -X POST https://filetypeconverters.com/api/v1/convert \
  -H "Authorization: Bearer $FTC_API_KEY" \
  -F "file=@input.svg" -F "from=svg" -F "to=ico" \
  -F 'options={"dpi":96}' \
  --output output.ico

Options this engine accepts for SVG → ICO

Key	Applies to	Type	Default
dpi	Reading SVG	number	96
width	Writing ICO	number	0
height	Writing ICO	number	0
fit	Writing ICO	contain · cover · fill	contain
quality	Writing ICO	number	90
background	Writing ICO	string	#ffffff
stripMetadata	Writing ICO	boolean	true

API reference

When this is the wrong conversion

Use /convert/svg-to-png and a dedicated favicon build step when you need 16, 32, 48, and 256 pixel entries.
Keep the SVG favicon for modern browsers if legacy ICO support is not needed.
Use square source art rather than a wide wordmark when the icon must fit browser tabs.

SVG to ICO questions

Does SVG to ICO create all favicon sizes?

No in the tested path. The output contained one 256×144 entry, so make a separate multi-size favicon if browser fallback sizes matter.

Why is my ICO not square?

The writer preserves the rendered aspect ratio while fitting inside 256 pixels. A wide SVG can therefore become a wide ICO entry.

Will transparency survive SVG to ICO?

Yes for the tested SVG. The output entry opened as RGBA, which kept transparent canvas pixels around the artwork.