Convert PNG to ICO online

To convert PNG to ICO, upload the PNG file, start the conversion and download the result: Converter.now writes an ICO icon with the standard sizes (16 to 256 px) that fit within the source. Transparency is kept.

◈ Encrypted transfer◷ Short retention⊘ No watermark◎ Works on every device

PNG to ICO at a glance

Converts: Portable Network Graphics → ICO raster image
Output: An ICO icon with the standard sizes (16 to 256 px) that fit within the source
Compression: PNG: lossless → ICO: lossless
Engine: Pillow (with ImageMagick fallback)
Privacy: Private download link; files are deleted after 6 hours. No account needed.

How PNG turns into ICO: Transparency flattening and image encoding

The PNG pixel canvas is decoded, its alpha composited against an opaque background, and the result encoded as ICO. Edge color must be judged against the actual destination background because transparency cannot be recovered afterward. PNG decoding combines filtered scanlines with declared color type, bit depth, palette or full alpha, color-profile chunks, and optional ancillary metadata. The ICO destination is a Windows icon resource, where useful delivery normally requires a deliberate set of square raster sizes rather than one arbitrary canvas.

Decoded canvas - Pixels written losslessly with a full alpha channel available. Written image - A Windows icon container that can hold several square pixel sizes and color depths.

For related jobs, compare other PNG converters with the full list of ICO conversions.

If you want the reasoning behind this PNG to ICO route, how pixel dimensions relate to print size explains why pixel dimensions, not the PPI tag, decide detail.

PNG

Portable Network Graphics

Used for lossless images and transparency.

Family: Images
MIME: image/png

→

ICO

ICO raster image

Designed for pixel-based artwork, scans, and photographs.

Family: Images
MIME: image/vnd.microsoft.icon

The delivery decision for this PNG to ICO route

ICO wins this route whenever its specific mix of compatibility, alpha, animation, and file size fits the destination better than PNG does.

What changes between the PNG model and the ICO deliverable

Transparency is kept.
Metadata handling differs between PNG and ICO; do not assume every application-specific field carries across untouched.

Reading PNG correctly and satisfying what ICO expects

What can fail when Portable Network Graphics is interpreted

PNG is a poor fit for photographic detail, and even without any JPEG-style loss, palette reduction can visibly simplify a smooth gradient.

What ICO raster image cannot safely promise

A conversion may create only one size, making the icon look soft in menus or high-density displays.

How the ICO writer handles this route

a Windows icon container that can hold several square pixel sizes and color depths is what gets written, labeled as image/vnd.microsoft.icon. Whether that actually opens depends on the receiving application, not on the file extension.

Acceptance evidence for the converted ICO

Record the PNG evidence before conversion

Zoom to 100% on transparent edges, gradients, and small text, and confirm the exact pixel dimensions.

Test the ICO file in its receiving workflow

Inspect the embedded sizes and preview the icon at 16, 32, 48, and 256 pixels where required.