CONVERT
XBM → AVIF
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Fast, secure XBM to AVIF conversion. No registration required.
Setup: XBM is an X Window System bitmap format stored as plain C source code. Goal: an interchangeable AVIF. A XBM to AVIF conversion is almost always about making an image land cleanly in another piece of software. X BitMap is well-suited to its original niche, but AVIF Image opens on more platforms or fits better into a publishing pipeline. Upload a XBM file above, pick any quality knobs, and download a ready-to-use AVIF. In practice XBM is an X Window System bitmap format stored as plain C source code. On the other end, AVIF is the AV1-based next-gen image codec, extremely efficient with full HDR and alpha support.
X BitMap
Source formatXBM (X BitMap) is a monochrome image format used in the X Window System for cursor and icon bitmaps. The format stores pixel data as C source code arrays, making it directly includable in X11 programs.
AVIF Image
Target formatAVIF is a next-generation image format based on the AV1 video codec. It offers significantly better compression than JPEG and WebP while maintaining excellent visual quality, including HDR and wide color gamut support.
Why convert XBM to AVIF
Converting keeps the picture recognisable end-to-end while changing the container that ships it. AVIF typically wins on one of three fronts: broader software support, smaller files for the same visual quality, or features like transparency that XBM cannot express. The conversion itself is fast because both sides are raster formats.
HOW TO CONVERT
XBM → AVIF
Upload your XBM
Start by dropping the XBM onto the uploader. Files up to 25 MB go through on the free tier without registration; paid plans go up to 2 GB.
Conversion happens server-side
Our imagemagick-based pipeline reads the XBM pixel grid, preserves resolution and colour profile, and encodes a clean AVIF.
Grab the result
A download button appears as soon as the AVIF is ready. Save locally or share the short-lived URL.
Common Use Cases
Share across platforms
Send AVIF files to anyone without worrying about whether they have the right software for XBM.
Embed in documents
Drop AVIF output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AVIF often produces smaller files than XBM 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.
XBM vs AVIF — Strengths and limitations
What each format does best, and where it falls short.
XBM Strengths
- Valid C source — embeddable.
- Text-editable.
- Tiny files.
- X11-native since 1989.
Limitations
- 1-bit monochrome only.
- Legacy — modern UIs use PNG/SVG.
- No compression.
AVIF Strengths
- Best-in-class compression efficiency — 30-50% smaller than JPEG for the same quality.
- Royalty-free and patent-unencumbered (unlike HEIC).
- Supports alpha transparency, HDR, wide gamut (BT.2020), and up to 12-bit color.
- Progressive decoding: a blurry preview appears while the file is still downloading.
- Supported in all major browsers since late 2022 — no polyfills needed.
Limitations
- Encoding is CPU-expensive — an AVIF export can take 10-30× longer than JPEG.
- Older software (pre-2022) cannot open AVIF without plugins.
- Email clients still largely ignore it — stick to JPEG for attachments.
XBM vs AVIF — Technical specifications
Side-by-side comparison of the technical details.
XBM
- MIME type
- image/x-xbitmap
- Extension
- .xbm
- Bit depth
- 1-bit
- Format
- C source code
AVIF
- MIME type
- image/avif
- Container
- HEIF (ISOBMFF)
- Codec
- AV1 (intra-only)
- Max dimensions
- 65 536 × 65 536 px
- Color depth
- Up to 12-bit per channel
- Color spaces
- sRGB, Display-P3, BT.2020, arbitrary ICC
| Specification | XBM | AVIF |
|---|---|---|
| MIME type | image/x-xbitmap | image/avif |
| Extension | .xbm | — |
| Bit depth | 1-bit | — |
| Format | C source code | — |
| Container | — | HEIF (ISOBMFF) |
| Codec | — | AV1 (intra-only) |
| Max dimensions | — | 65 536 × 65 536 px |
| Color depth | — | Up to 12-bit per channel |
| Color spaces | — | sRGB, Display-P3, BT.2020, arbitrary ICC |
XBM vs AVIF — Typical file sizes
Approximate file sizes for common scenarios.
XBM
- Mouse cursor (16×16) < 1 KB
AVIF
- Thumbnail (400px) 10-30 KB
- Web photo (1920px) 80-300 KB
- 4K photo (3840px) 300 KB - 1.2 MB
- Lossless copy of 24MP photo 8-15 MB
Quality & Compatibility
Converting keeps resolution, aspect ratio and colour profile identical to the source. Metadata (EXIF, XMP) transfers where AVIF supports it; otherwise it is dropped. If the XBM contained an alpha channel and AVIF 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 AVIF at 2× the CSS pixel size; the crispness gap over 1× is noticeable on modern screens.
- Strip EXIF metadata from the AVIF before publishing if the XBM came from a phone camera — it often contains GPS coordinates and device IDs.
- If the XBM is a screenshot of text or UI, prefer a lossless AVIF target to avoid the JPEG-style ringing around glyph edges.
Frequently Asked Questions
It depends on the codecs involved. If both XBM and AVIF are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If AVIF is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded XBM exactly, but cannot recover detail that XBM had already compressed away.
Often yes, especially when AVIF is lossless. XBM tuned for efficient web delivery will usually produce smaller files than AVIF'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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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.