CONVERT
ICO → XPM
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Fast, secure ICO to XPM conversion. No registration required.
ICO is the Windows icon container with multiple resolutions packed into one file. Reaching a XPM from there is one hop. A ICO → XPM operation is one of the simplest image jobs there is: same pixel grid, different wrapper. What genuinely changes is how lossy the codec is, whether alpha survives, and how large the final file ends up. KaijuConverter picks safe defaults for each of those and lets you override them under Advanced. Context: ICO is the Windows icon container with multiple resolutions packed into one file. XPM is a raster image format with its own balance of compression, colour depth, and software support.
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.
X PixMap
Target formatXPM (X PixMap) is a color image format for the X Window System that stores pixel data as ASCII text with a color palette. Unlike XBM, it supports full color and transparency through a simple text-based representation.
Why convert ICO to XPM
The real reason to move from ICO to XPM is almost never picture quality — both raster formats store essentially the same pixels. It is about the tools downstream: which editors open the file natively, which CMSes upload it without transcoding, which social platforms accept it. Picking XPM solves those edge cases at the cost of a short conversion step.
HOW TO CONVERT
ICO → XPM
Provide the ICO
Click or drag to upload. We accept a single ICO file per job, with an optional queue of additional images for batch mode.
Encode to XPM
The conversion decodes the ICO, resolves the colour space to sRGB and writes the XPM container around the pixel data.
Save the XPM
The download is streamed back over HTTPS. If you uploaded multiple files, a ZIP with all XPM outputs is produced instead.
Common Use Cases
Document embeds
Word, Google Docs and Pages embed XPM with correct aspect ratio; ICO may appear as a broken image icon.
Printer-friendly export
Consumer and office printers drive XPM through their print spoolers with no additional drivers.
Presentation slides
PowerPoint and Keynote treat XPM as a first-class citizen; ICO may need manual re-insertion per slide.
Online form uploads
Identity verification, job applications and legal forms often list XPM as the only accepted image format.
ICO vs XPM — 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).
XPM Strengths
- Valid C source — directly embeddable in code.
- Text-editable in any editor.
- Transparency via "None" color value.
- Stable since 1989 with no breaking changes.
Limitations
- Enormous file sizes vs compressed formats.
- Only useful within X11 / legacy Unix GUI ecosystem.
- Limited color palette in classic form (256 colors max practical).
ICO vs XPM — 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+)
XPM
- MIME type
- image/x-xpixmap
- Extension
- .xpm
- Encoding
- ASCII text (valid C source)
- Native environment
- X Window System (X11)
- Predecessor
- .xbm (X Bitmap, 1-bit)
| Specification | ICO | XPM |
|---|---|---|
| MIME type | image/vnd.microsoft.icon | image/x-xpixmap |
| 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+) | — |
| Extension | — | .xpm |
| Encoding | — | ASCII text (valid C source) |
| Native environment | — | X Window System (X11) |
| Predecessor | — | .xbm (X Bitmap, 1-bit) |
ICO vs XPM — Typical file sizes
Approximate file sizes for common scenarios.
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
XPM
- Small icon (32×32, 16 colors) 2-5 KB
- Toolbar button set 10-50 KB
Quality & Compatibility
ICO-to-XPM conversion does not change the visible content. Quality is capped by the ICO decode; re-encoding a lossy source at high quality cannot recover detail that was already discarded. For archival masters, keep the original ICO alongside the XPM copy.
Tips for Best Results
- Large ICO files may look identical to small XPM files for photographic content; pick quality based on end use, not headline megapixels.
- For print, export XPM at 300 DPI minimum and check that the colour profile embedded matches the print shop specification.
- Batch-convert related ICO images in one pass so they share identical encoder settings and look consistent side-by-side.
Frequently Asked Questions
It depends on the codecs involved. If both ICO and XPM are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If XPM 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 XPM is lossless. ICO tuned for efficient web delivery will usually produce smaller files than XPM'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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