WEBP vs XPM
A detailed comparison of WebP Image and X PixMap — file size, quality, compatibility, and which format to choose for your workflow.
WebP Image
Raster & Vector ImagesWebP is a modern image format developed by Google that provides superior lossless and lossy compression. Files are typically 25-35% smaller than equivalent JPEG or PNG images at the same visual quality.
About WEBP filesX PixMap
Raster & Vector ImagesXPM (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.
About XPM filesStrengths Comparison
WEBP Strengths
- Smaller file sizes than JPEG, PNG, and GIF at equivalent visual quality.
- Single format for lossy photos, lossless graphics, transparency, and animation.
- Full alpha channel support with smaller files than PNG.
- Now universally supported in all modern browsers.
- Open-source reference implementation (libwebp) by Google.
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
WEBP Limitations
- Some older software and image editors still don't read WebP natively.
- Max dimensions are 16,383 × 16,383 — lower than JPEG or PNG.
- Print workflows rarely support WebP (no CMYK, limited color management).
- Editing tools are less mature than JPEG/PNG; round-tripping can lose quality.
XPM 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).
- Superseded by PNG and SVG for modern UI.
Technical Specifications
| Specification | WEBP | XPM |
|---|---|---|
| MIME type | image/webp | image/x-xpixmap |
| Compression | VP8 (lossy) or VP8L (lossless) | — |
| Color depth | 8 bits per channel | — |
| Max dimensions | 16,383 × 16,383 pixels | — |
| Transparency | Full 8-bit alpha channel | — |
| Animation | Supported since WebP 2012 revision | — |
| Extension | — | .xpm |
| Encoding | — | ASCII text (valid C source) |
| Native environment | — | X Window System (X11) |
| Predecessor | — | .xbm (X Bitmap, 1-bit) |
Typical File Sizes
WEBP
- Web photo (vs JPEG equivalent) 25–35% smaller
- Transparent logo (vs PNG) 20–30% smaller
- Animated replacement for GIF 60–80% smaller
- Hero banner (1920×1080) 150–400 KB
XPM
- Small icon (32×32, 16 colors) 2-5 KB
- Toolbar button set 10-50 KB
Ready to convert?
Convert between WEBP and XPM online, free, and without installing anything. Encrypted upload, automatic deletion after 2 hours.
Frequently Asked Questions
WebP is a modern image format developed by Google in 2010. It supports both lossy and lossless compression, transparency, and animation, while delivering files 25-35% smaller than JPEG and PNG equivalents.
XPM (X PixMap) is an image format used to store raster graphics — a two-dimensional grid of pixels describing a picture. It is part of the raster & vector images family and designed around a specific trade-off between file size, visual fidelity, and feature support (transparency, colour depth, compression type). Photographers, web designers, and content creators choose XPM when its particular strengths match the publishing target.
WebP files open natively in Chrome, Firefox, Safari, Edge, and most modern image viewers. On Windows, the Photos app supports WebP. On macOS, Preview handles it from macOS Big Sur onward.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open XPM natively. On mobile, iOS Photos and Google Photos display XPM in the gallery when supported by the OS. If the format is rare or new, convert to JPG or PNG first — both are universally readable — using our XPM to JPG or XPM to PNG converter.
AVIF offers even better compression than WebP (up to 50% smaller) but has less browser and software support. Use WebP for broad compatibility today. Choose AVIF for cutting-edge web performance if your audience uses modern browsers.
Upload the XPM to KaijuConverter and pick a target format (JPG, PNG, WebP, HEIC, TIFF, BMP, SVG, PDF). The conversion runs in the browser via ImageMagick and returns a download in seconds. No account or installation required; both input and output delete automatically within two hours.