CONVERT
WBMP → ICO
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Fast, secure WBMP to ICO conversion. No registration required.
Here is the short version — WBMP is a raster image format with its own balance of compression, colour depth, and software support. Hence the need for ICO. A WBMP to ICO conversion is almost always about making an image land cleanly in another piece of software. Wireless Bitmap is well-suited to its original niche, but ICO Icon opens on more platforms or fits better into a publishing pipeline. Upload a WBMP file above, pick any quality knobs, and download a ready-to-use ICO. Background. WBMP is a raster image format with its own balance of compression, colour depth, and software support. Destination side, ICO is the Windows icon container with multiple resolutions packed into one file.
Wireless Bitmap
Source formatWBMP (Wireless Bitmap) is a monochrome image format designed for early WAP-enabled mobile devices. It stores 1-bit black-and-white images with minimal overhead, optimized for the bandwidth constraints of early mobile networks.
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.
Why convert WBMP to ICO
Converting keeps the picture recognisable end-to-end while changing the container that ships it. ICO typically wins on one of three fronts: broader software support, smaller files for the same visual quality, or features like transparency that WBMP cannot express. The conversion itself is fast because both sides are raster formats.
HOW TO CONVERT
WBMP → ICO
Upload your WBMP
Start by dropping the WBMP onto the uploader. Files up to 100 MB go through on the free tier without registration.
Conversion happens server-side
Our imagemagick-based pipeline reads the WBMP pixel grid, preserves resolution and colour profile, and encodes a clean ICO.
Grab the result
A download button appears as soon as the ICO is ready. Save locally or share the short-lived URL.
Common Use Cases
Cross-platform previews
Windows, macOS and Linux file browsers all render ICO thumbnails; WBMP support varies by OS version.
Mobile galleries
iOS Photos, Google Photos and Samsung Gallery index ICO instantly — WBMP sometimes falls back to a generic file icon.
Stock photography uploads
Shutterstock, Adobe Stock and similar marketplaces require ICO in their contributor guidelines.
Archive migration
Converting legacy WBMP archives to ICO future-proofs the collection against declining codec support.
WBMP vs ICO — Strengths and limitations
What each format does best, and where it falls short.
WBMP Strengths
- Tiny file size.
- Pre-smartphone mobile standard.
- Trivial to encode.
Limitations
- Monochrome only.
- WAP era is dead.
- Zero modern use.
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).
WBMP vs ICO — Technical specifications
Side-by-side comparison of the technical details.
WBMP
- MIME type
- image/vnd.wap.wbmp
- Extension
- .wbmp
- Bit depth
- 1-bit
- Origin
- WAP Forum (1999)
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+)
| Specification | WBMP | ICO |
|---|---|---|
| MIME type | image/vnd.wap.wbmp | image/vnd.microsoft.icon |
| Extension | .wbmp | — |
| Bit depth | 1-bit | — |
| Origin | WAP Forum (1999) | — |
| 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+) |
WBMP vs ICO — Typical file sizes
Approximate file sizes for common scenarios.
WBMP
- Typical WBMP icon 50-200 bytes
ICO
- 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
Quality & Compatibility
Converting keeps resolution, aspect ratio and colour profile identical to the source. Metadata (EXIF, XMP) transfers where ICO supports it; otherwise it is dropped. If the WBMP contained an alpha channel and ICO does not support transparency, the background is flattened to white by default.
Tips for Best Results
- When uploading to Retina / high-DPI contexts, render the ICO at 2× the CSS pixel size; the crispness gap over 1× is noticeable on modern screens.
- Strip EXIF metadata from the ICO before publishing if the WBMP came from a phone camera — it often contains GPS coordinates and device IDs.
- If the WBMP is a screenshot of text or UI, prefer a lossless ICO target to avoid the JPEG-style ringing around glyph edges.
Frequently Asked Questions
It depends on the codecs involved. If both WBMP 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 WBMP exactly, but cannot recover detail that WBMP had already compressed away.
Often yes, especially when ICO is lossless. WBMP 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.
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