SFW to XBM Converter

Export Seattle FilmWorks photos to XBM format online for free

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Server-Side Speed

Heavy lifting happens in the cloud — your device resources are untouched while SFW images are processed into XBM format.

Simple Workflow

Upload SFW, pick XBM, download the result — the three-step process makes converting legacy formats effortless for anyone.

File Privacy First

Uploaded SFW images and converted XBM results are automatically purged — originals immediately, outputs within 24 hours.

How to convert SFW to XBM

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose xbm or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your xbm file right afterwards

About formats

SFW is a proprietary image format created by Seattle FilmWorks (later PhotoWorks) for their Pictures on Disk mail-order photo service, active primarily from 1994 through the early 2000s. Customers who sent film to Seattle FilmWorks for developing could opt to receive their photos back on 3.5-inch floppy disks in addition to (or instead of) traditional prints. SFW files contained the scanned photographs in a JPEG-based encoding wrapped in a custom header, designed to be viewed through Seattle FilmWorks' proprietary desktop software. The service was notably popular in the mid-1990s, offering one of the most accessible ways for ordinary consumers to obtain digital versions of their film photographs before consumer scanners and digital cameras became affordable. SFW files typically contained modest-resolution scans appropriate for screen viewing and small prints — sufficient quality for the 640x480 and 800x600 monitor resolutions common at the time. One advantage of SFW files is their role as historical artifacts: for many families, SFW disks represent the only digital copies of film-era photographs from the 1990s, preserved on media that predates widespread home scanning and digital photography. The underlying JPEG data ensures reasonable image quality despite the proprietary wrapper. Extracting images from SFW files is straightforward: tools like XnView, ImageMagick, and specialized SFW-to-JPEG converters can strip the proprietary header and save the standard JPEG data, making these nostalgic files accessible on any modern device.
Developer: Seattle FilmWorks
Initial release: 1994
XBM (X BitMap) is a monochrome (1-bit) image format defined as part of the X Window System, originating at MIT around 1987. XBM files are unique among image formats in being valid C source code: each file defines the image as a static array of unsigned char values containing the packed pixel data, preceded by #define statements specifying the image width, height, and optional hot-spot coordinates (for cursor images). The pixel data is stored in hexadecimal byte values within curly braces, with each bit representing one pixel (1 = foreground, 0 = background) and bits ordered LSB-first within each byte. This design was intentional — XBM images could be #included directly into X Window application source code and compiled into the binary, eliminating the need for external file loading and runtime format parsing. The format was used throughout the X11 ecosystem for cursor shapes, window icons, toolbar buttons, and other small UI elements. One advantage is the source-code nature of the format: XBM files can be edited with a text editor, diff'd and merged in version control, generated by shell scripts, and compiled directly into C programs without any image loading library — a level of toolchain integration that no binary image format can match. The format's role as part of the X Window standard ensures it is understood by every X11-aware toolkit and application. While limited to monochrome and no compression, XBM's simplicity makes it an excellent teaching format for understanding bitmap representations. XBM files are supported by all X11 applications, ImageMagick, GIMP, web browsers (as a legacy web format), and programming environments.
Developer: MIT X Consortium
Initial release: 1987

Frequently Asked Questions

Why convert SFW to XBM?

SFW photos require viewer software that no longer ships. Converting to XBM ensures those memories remain viewable and shareable.

What programs can open XBM?

Web browsers, GIMP, Inkscape, and X Window applications open XBM bitmap images. This text-based format is easily human-readable.

How accurate is SFW to XBM conversion?

Since XBM supports lossless storage, the pixel data carries over without degradation. The result faithfully represents the source SFW image.

How quickly can I convert SFW to XBM?

Conversion is handled on cloud servers and usually completes in a few seconds. Larger or higher-resolution SFW images may take slightly longer.

Does Convertio support batch SFW to XBM conversion?

Batch conversion is supported. Queue as many SFW files as you need and convert them all to XBM in a single run — no repeating steps manually.

Can I recover photos from old floppy disks?

If you can read the SFW files from the disk onto your computer, Convertio will convert them to XBM — rescuing those memories.