CONVERT ICO → PNG (ICO to PNG)
Extract icon images from ICO files as high-quality PNG.
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Automatic format identification and lossless transcoding across 201+ formats.
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GPS Coordinates (37.1773° N, 3.5986° W): Stripped (Zero Location Leak)
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Device Serial & Lens ID: Stripped (EXIF / IPTC / XMP Clean)
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Color Space Profile: Display P3 → sRGB IEC61966-2.1
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Chroma Subsampling: 4:4:4 High Fidelity (High-fidelity algorithmic conversion)
HOW TO CONVERT ICO → PNG
Drop the ICO file
Drag and drop or click to upload your ICO. The image is transferred securely over HTTPS and queued for conversion.
Re-encode with ImageMagick
ImageMagick decodes every pixel of the ICO and writes a matching PNG with sensible default quality settings.
Download the PNG
The converted PNG is ready to download as a single file; both files delete automatically within two hours.
ICO files are Windows icon containers, not a single image format. Each ICO file embeds multiple raster frames at different resolutions — typically 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels — so that the OS picks the most appropriate size for each display context. When you convert ICO to PNG, you are extracting one of those embedded frames as a standalone raster image. The 256×256 frame stored inside modern ICO files is typically PNG-compressed natively (a change introduced with Windows Vista), meaning that frame already is a lossless RGBA PNG blob; extracting it involves virtually no re-encoding loss. Older ICO frames use uncompressed 32-bit DIB (Device Independent Bitmap) data with an AND-mask for transparency, which the converter maps faithfully to a standard RGBA PNG. The result is a single flat image file that any graphics tool, browser, or design application can open without Windows-specific icon handling.
Why convert ICO to PNG
Designers frequently need the ICO graphic as a usable image asset — to embed a favicon or app icon into documentation, a mockup, a social media image, or a Figma component. ICO is not accepted as a source image by most image editors, web design tools, or CMS platforms outside the narrow favicon upload field. Developers also extract the ICO frame to inspect pixel-level icon artwork, run image diffs between versions, or supply it as a fallback Open Graph image. PNG is the natural target because it preserves the full RGBA channel that ICO carries, including per-pixel alpha transparency at all opacity levels.
ICO vs PNG — Technical specifications
Side-by-side comparison of the technical details.
ICO
- MIME type
- image/vnd.microsoft.icon
- Max resolutions per file
- 65 535 images
- Max single image size
- 256×256 px
- Color depths
- 1, 4, 8, 24, 32 bits per pixel
- Compression
- Uncompressed bitmap or embedded PNG (Vista+)
- MIME Type
- image/x-icon
- Extension
- .ico
- Category
- Raster & Vector Images
- Full Name
- ICO Icon
- Conversion Engine
- IMAGEMAGICK
PNG
- MIME type
- image/png
- Compression
- Lossless — DEFLATE (zlib)
- MIME Type
- image/png
- Extension
- .png
- Category
- Raster & Vector Images
- Full Name
- PNG Image
- Conversion Engine
- IMAGEMAGICK
- Color depth
- 1, 2, 4, 8 or 16 bits per channel
- Max dimensions
- 2^31 − 1 pixels per side (2.1 billion)
- Transparency
- Full 8-bit alpha channel
- Standard
- ISO/IEC 15948:2004
| Specification | ICO | PNG |
|---|---|---|
| MIME type | image/vnd.microsoft.icon | image/png |
| Max resolutions per file | 65 535 images | — |
| Max single image size | 256×256 px | — |
| Color depths | 1, 4, 8, 24, 32 bits per pixel | — |
| Compression | Uncompressed bitmap or embedded PNG (Vista+) | Lossless — DEFLATE (zlib) |
| MIME Type | image/x-icon | image/png |
| Extension | .ico | .png |
| Category | Raster & Vector Images | Raster & Vector Images |
| Full Name | ICO Icon | PNG Image |
| Conversion Engine | IMAGEMAGICK | IMAGEMAGICK |
| Color depth | — | 1, 2, 4, 8 or 16 bits per channel |
| Max dimensions | — | 2^31 − 1 pixels per side (2.1 billion) |
| Transparency | — | Full 8-bit alpha channel |
| Standard | — | ISO/IEC 15948:2004 |
ICO vs PNG — Strengths and limitations
What each format does best, and where it falls short.
ICO Strengths
- Multi-resolution: one file, many sizes, OS picks the right one.
- Universal favicon support in every browser since IE5.
- Supports transparency (1-bit since 1985, full alpha since XP).
- Tiny file size — an entire favicon pack typically fits in under 15 KB.
- No licensing or patent concerns — fully in the public domain spec-wise.
Limitations
- Cannot compress continuous-tone images efficiently — use PNG or WebP for photos.
- Format is essentially frozen in 1999 — no HDR, no wide gamut, no modern features.
- Maximum image dimension is 256×256 px (inside an ICO container).
PNG Strengths
- Lossless compression — every save preserves the original pixels perfectly.
- Full 8-bit alpha channel for smooth transparency.
- Excellent for text, UI screenshots, logos, and line art.
- Royalty-free and an ISO standard (ISO/IEC 15948).
- Supports 16-bit color depth for high-fidelity work.
Limitations
- Much larger than JPEG for photographs (no perceptual compression).
- No native animation in most software (APNG support is inconsistent).
- No CMYK support — web and screen only, not print.
Quality & Compatibility
The ICO 256×256 frame stored as an internal PNG blob is extracted losslessly — no pixel data changes. Older frames using DIB encoding are converted with full fidelity: the 32-bit BGRA channels are reordered to RGBA and written as a standard 8-bit-per-channel PNG. The AND-mask used by legacy 1-bit transparency ICO variants (common in XP-era icons) is composited with the color data to reconstruct the alpha channel, which may introduce binary (fully opaque / fully transparent) edges rather than smooth anti-aliased ones. Bit depth stays at 8 bits per channel (24-bit color plus 8-bit alpha, 32-bit total), matching standard ICO data. ICC color profiles and embedded metadata from the ICO container are not preserved, as the ICO format does not carry them — the PNG output will have no embedded profile. The conversion extracts a single resolution frame; the other embedded sizes in the original ICO are discarded.
Tips for Best Results
- Extract the largest available frame — 256×256 — for general use. If you need the 16×16 or 32×32 art specifically for a pixel-level inspection, be aware it was drawn separately at that size and is not a downscale of the large frame; use a tool that lets you select the source frame before converting.
- If the ICO was created before Windows Vista its 256×256 frame may not exist, leaving 48×48 as the largest. Upscaling that to a larger canvas after extraction will look soft. Check the PNG dimensions immediately after conversion to confirm you got the resolution you expected.
- After conversion verify the alpha channel is intact by opening the PNG against a coloured background in any image viewer. Legacy AND-mask transparency in XP-era ICO files sometimes produces hard transparent edges rather than the smooth anti-aliasing of newer RGBA icons, and no converter can reconstruct subpixel data that was never stored.
Frequently Asked Questions
It depends on the codecs involved. If both ICO and PNG are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If PNG is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded ICO exactly, but cannot recover detail that ICO had already compressed away.
Often yes, especially when PNG is lossless. ICO tuned for efficient web delivery will usually produce smaller files than PNG's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
ICO Icon
Source formatICO is the icon file format used for favicons and Windows application icons. A single ICO file can contain multiple image sizes and color depths for different display contexts.
PNG Image
Target formatPNG is a lossless image format that supports transparency. It is ideal for graphics, logos, screenshots, and any image where preserving exact pixel data is important.
Going the other way? Convert PNG back to ICO with the same engine.
Common Use Cases
Share across platforms
Send PNG files to anyone without worrying about whether they have the right software for ICO.
Embed in documents
Drop PNG output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
PNG often produces smaller files than ICO for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
ICO vs PNG — Typical file sizes
Approximate file sizes for common scenarios.
- Classic favicon (16×16 only) < 2 KB
- Multi-size favicon pack (16/32/48/256) 5-15 KB
- Full Windows app icon set 20-100 KB
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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