SFW to SIX Converter

Convert Seattle FilmWorks photos to SIX format online for free

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No Install Required

The entire SFW to SIX conversion runs in your browser. No desktop software, no plugins — just upload and convert.

Server-Side Speed

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

Cross-Platform Access

Whether you are on Windows, macOS, Linux, or mobile — SFW to SIX conversion is available from any connected device.

How to convert SFW to SIX

1

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

2

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

3

Let the file convert and you can download your six 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
SIX is a file extension for SIXEL (Six Pixel) graphics data, a bitmap graphics format developed by Digital Equipment Corporation (DEC) in 1983 and introduced with the LA50 dot matrix printer. SIXEL encodes images as a sequence of printable ASCII characters, where each character represents a column of six vertical pixels (a 'sixel') — the character's ASCII value minus 63 provides a 6-bit binary pattern, with each bit controlling one pixel in the vertical column. The encoding is structured as a series of sixel bands (each six pixels tall) across the image width, with control sequences for color selection (up to 256 registers with HLS or RGB specification), repeat counts (run-length encoding for efficiency), carriage return, and newline commands. SIXEL data is transmitted to the output device using DEC's standard escape sequence protocol, embedded within the text stream alongside regular character output. Originally designed for DEC's line of printers and later supported by DEC VT-series terminals (VT240, VT330, VT340), SIXEL has experienced a remarkable revival in modern terminal emulator software. One advantage is terminal-native image display: SIXEL allows images to be rendered directly within a text terminal session without requiring a graphical window system, enabling command-line tools to display graphs, photographs, and previews inline with text output. This capability has driven adoption in modern terminals like mlterm, xterm, WezTerm, and foot. SIX/SIXEL data can be generated by ImageMagick, libsixel, and chafa, and viewed in any SIXEL-capable terminal emulator.
Initial release: 1983

Frequently Asked Questions

Why convert SFW to SIX?

Seattle FilmWorks locked photos in a proprietary format. Converting SFW to SIX frees your personal photographs for modern use.

What programs can open SIX?

Terminal emulators with SIXEL support (mlterm, foot, xterm) render SIX graphics inline. ImageMagick can also process SIX files.

Will I lose image quality converting SFW to SIX?

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

How long does SFW to SIX conversion take?

The process is fast — cloud-based processing handles SFW to SIX conversion in seconds for standard-sized images, even on slower connections.

Can I convert multiple SFW images at once?

Absolutely. Add several SFW images at once, set SIX as the output, and the converter processes them all in parallel for maximum efficiency.

Do I need the original SFW viewer software?

No — Convertio converts SFW independently of the original viewer. Upload the file directly and receive a standard SIX output.