CONVERT PNG → ICO (PNG to ICO)
Convert PNG images to ICO format for website favicons and desktop icons.
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Lossless JPEG Q100 + standard COM segment padding for government & exam portals
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Automatic format identification and lossless transcoding across 201+ formats.
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EXIF & Color Verification Audit ISO Verified
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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 PNG → ICO
Drop the PNG file
Drag and drop or click to upload your PNG. The image is transferred securely over HTTPS and queued for conversion.
Re-encode with ImageMagick
ImageMagick decodes every pixel of the PNG and writes a matching ICO with sensible default quality settings.
Download the ICO
The converted ICO is ready to download as a single file; both files delete automatically within two hours.
PNG files exist to store raster images with lossless compression and, critically, full alpha-channel transparency using up to 16 bits per channel. ICO is the native icon container format that Windows uses for executable files, shortcuts, folder overlays, and browser favicons — it is not a general image format but a multi-resolution container that Windows Explorer, the taskbar, and the Windows shell renderer query at runtime to pick the best-fitting resolution. The typical reason a developer converts PNG to ICO is that they have a high-quality source artwork at 256x256 or 512x512 and need a single .ico file that bundles several sizes — 16x16, 32x32, 48x48, and 256x256 — so Windows can display a sharp icon at every UI scale and DPI setting without rescaling a single fixed bitmap at runtime. A favicon.ico served at the web root must also be an ICO container because older browsers and RSS readers still look specifically for that format and extension rather than accepting a PNG with a link tag.
Why convert PNG to ICO
Windows icon slots in .exe resources, .lnk shortcuts, and the shell thumbnail cache all read the ICO container format. No matter how well-crafted a PNG is, Windows Explorer cannot use it directly as an application icon — it must be wrapped in ICO. Browser favicon support also favors ICO at the site root because HTTP clients issued by OS-level tools, RSS readers, and older Chromium versions request /favicon.ico by name before reading link rel="icon" tags. Converting a PNG to ICO is therefore a packaging step, not a quality improvement: the developer already has the pixel art in PNG and simply needs the shell-compatible wrapper.
PNG vs ICO — Technical specifications
Side-by-side comparison of the technical details.
PNG
- MIME type
- image/png
- Compression
- Lossless — DEFLATE (zlib)
- 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
- MIME Type
- image/png
- Extension
- .png
- Category
- Raster & Vector Images
- Full Name
- PNG Image
- Conversion Engine
- IMAGEMAGICK
ICO
- MIME type
- image/vnd.microsoft.icon
- 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
- Max resolutions per file
- 65 535 images
- Max single image size
- 256×256 px
- Color depths
- 1, 4, 8, 24, 32 bits per pixel
| Specification | PNG | ICO |
|---|---|---|
| MIME type | image/png | image/vnd.microsoft.icon |
| Compression | Lossless — DEFLATE (zlib) | Uncompressed bitmap or embedded PNG (Vista+) |
| 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 | — |
| MIME Type | image/png | image/x-icon |
| Extension | .png | .ico |
| Category | Raster & Vector Images | Raster & Vector Images |
| Full Name | PNG Image | ICO Icon |
| Conversion Engine | IMAGEMAGICK | IMAGEMAGICK |
| Max resolutions per file | — | 65 535 images |
| Max single image size | — | 256×256 px |
| Color depths | — | 1, 4, 8, 24, 32 bits per pixel |
PNG vs ICO — Strengths and limitations
What each format does best, and where it falls short.
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.
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).
Quality & Compatibility
PNG uses DEFLATE lossless compression and preserves every pixel value without degradation. ICO can store each embedded size either as a lossless BMP/DIB bitmap (older style, no compression) or, for the 256x256 slot specifically, as a full PNG stream embedded verbatim inside the ICO container — meaning that slot incurs zero quality loss. Smaller sizes (16x16, 32x32, 48x48) are stored as uncompressed BMP DIBs inside ICO, so those rescaled versions are lossless but the downsampling algorithm used during conversion affects sharpness. Alpha transparency is preserved: ICO supports 32-bit ARGB for all sizes when stored as PNG-inside-ICO or 32-bit DIB; the 8-bit AND mask transparency of old 1-bit ICO is not applied when the source PNG has a full alpha channel and the output uses 32-bit depth. Metadata (EXIF, XMP, color profile) is stripped entirely — ICO carries no metadata fields.
Tips for Best Results
- Supply a source PNG of at least 256x256 pixels with a transparent background before converting. The conversion tool generates the smaller sizes by downsampling, so starting from a high-resolution source with clean edges produces sharper 16x16 and 32x32 thumbnails than starting from a 64x64 original.
- If your ICO is intended as a Windows application icon, verify the output contains at least the 16x16, 32x32, and 48x48 sizes alongside 256x256. Windows Explorer uses 48x48 in large-icon view and falls back to upscaling whichever size is closest when a requested size is missing, which produces blurry results in the taskbar.
- For web favicons, placing the resulting favicon.ico at your domain root covers legacy browser requests automatically. Modern browsers additionally accept a PNG via a link rel='icon' tag, so keeping your original PNG alongside the ICO lets you serve the highest-fidelity version to current browsers while the ICO handles older clients.
Frequently Asked Questions
It depends on the codecs involved. If both PNG and ICO are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If ICO is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded PNG exactly, but cannot recover detail that PNG had already compressed away.
Often yes, especially when ICO is lossless. PNG tuned for efficient web delivery will usually produce smaller files than ICO'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.
PNG Image
Source 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.
ICO Icon
Target 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.
Going the other way? Convert ICO back to PNG with the same engine.
Common Use Cases
Share across platforms
Send ICO files to anyone without worrying about whether they have the right software for PNG.
Embed in documents
Drop ICO output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
ICO often produces smaller files than PNG 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.
PNG vs ICO — Typical file sizes
Approximate file sizes for common scenarios.
- Icon or small logo 2–20 KB
- UI screenshot (1920×1080) 200–800 KB
- High-res photo (12 MP) 10–30 MB
- 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
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Related comparisons
See these formats side by side to understand which fits your use case best.
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