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Image Converter

Convert PNG to SFW

Looking for PNG to SFW? Here's why SFW isn't an output option — and the modern formats to use.

We don't create SFW files — it's a legacy format that's effectively read-only. Here's what to convert to instead.

Why PNG to SFW isn't offered

1

SFW is legacy and read-only here

SFW (Seattle FilmWorks) is a proprietary 1990s photo-lab format. It can usually be opened and converted from, but it's long obsolete, so there's no modern encoder to create new SFW files.

2

Convert to a current format

For a file that opens everywhere, convert your PNG to JPG, TIFF or WEBP instead.

Format details

What is a PNG file?

PNG is a lossless raster format with full transparency. It keeps every pixel intact, making it ideal for logos, icons, screenshots and graphics with sharp edges.

Full name
Portable Network Graphics
Developed by
PNG Development Group
Released
1996
Extension
.png
MIME type
image/png
Transparency
Yes

How to open PNG opens in every browser and image viewer, plus Photoshop, GIMP, Preview and Photos.

Full PNG format guide

What is a SFW file?

SFW is Seattle FilmWorks' proprietary format from its mail-order film-developing service, which delivered scans in this locked format.

Full name
Seattle FilmWorks Image
Developed by
Seattle FilmWorks
Released
1994
Extension
.sfw
MIME type
image/sfw
Transparency
Varies

How to open SFW opens with SFW converters and IrfanView; convert to JPG to free the images for normal use.

Full SFW format guide

What you can do instead

Convert PNG to JPG

A small, universal photo format that opens everywhere.

PNG → JPG

Convert PNG to TIFF

Lossless and uncompressed — ideal for editing, archiving and print.

PNG → TIFF

Convert PNG to WEBP

A modern format with small files at high quality for the web.

PNG → WEBP

Frequently asked questions

Can I convert PNG to SFW?
Not here — SFW is a legacy format with no modern encoder. We can often read SFW as a source, but for output use a current format like JPG, TIFF or WEBP.
What can I convert my PNG to instead?
PNG converts to JPG, TIFF or WEBP — free, no sign-up, no watermark.