What is the XXX file format?
.xxx files are associated with Compucon embroidery software, developed for the Singer EOS and Singer Professional Sew Ware (PSW) platforms. Data stored in .xxx files can be uploaded directly to a compatible automated embroidery machine.
.xxx files store embroidery projects and define such aspects as:
- type and density of stitch pattern,
- thread color sequences,
- embroidery size and hoop placement.
.xxx files store data in binary format, beginning with a proprietary header (commonly 0x7F 0x00) followed by a stitch coordinate list and an indexed color table. No official specification has been published; the format has been reverse-engineered by open-source libraries such as pyembroidery and Ink/Stitch, enabling broad modern software support.
.xxx files can be converted to other formats in order to open them on embroidery machines that do not support .xxx - for example to .PES (Brother) or .DST (Tajima). Converting .xxx files is typically done using dedicated conversion tools, the majority of which are very intuitive. Such tools also allow users to generate .xxx files based on images (for example, .BMP files). The tools offer many functions for editing design projects and further customizing embroidery patterns.
Security & safety
RISK: LOWAn .xxx embroidery file is passive data (stitch coordinates and colors) and does not execute code, so the file itself is safe to open in embroidery software. Two practical cautions: (1) because "xxx" is a generic three-letter string, a file literally named something.xxx might be an unrelated placeholder or a mislabelled download rather than an embroidery design - check the first bytes / source if a viewer rejects it; (2) avoid sketchy "free embroidery converter" download portals that bundle adware - use Ink/Stitch (inkstitch.org) or Wilcom TrueSizer (wilcom.com) from their official sites.
Format details
in a nutshell- ICQ / generic 'unknown' placeholder - Some apps and downloads save a file literally named .xxx as a placeholder for an unknown/unspecified type; it is not the embroidery format.
- Adult-content / dummy filename - '.xxx' is sometimes used informally as a stand-in extension in examples or to hint at adult material; carries no defined file structure.
Programs that open XXX files
Windows4 apps
Embird Embroidery Software
Paid Open the .xxx in Embird Manager to preview, edit and convert; long-standing multi-format embroidery suite.
Ink/Stitch (with Inkscape)
Open-source Install the free Ink/Stitch extension for Inkscape; open the .xxx to view, edit and re-export to other embroidery formats.
Wilcom TrueSizer
Free Free Wilcom viewer/converter - open the .xxx to preview, resize and save to PES/DST/JEF and other formats.
mySewnet Embroidery (Husqvarna/Singer)
Freemium Open and convert .xxx/PSW designs; the modern successor to Singer/Husqvarna embroidery software. 
macOS2 apps
Convert It, Mac
Paid BriTon Leap's Mac embroidery converter - open the .xxx and export to PES/DST/JEF etc. (db link macemb.com is BriTon Leap's old domain).
Ink/Stitch (with Inkscape)
Open-source Free on macOS via Inkscape; open the .xxx to view and convert to other embroidery formats.
Wilcom TrueSizer Web
Free Browser-based viewer/converter - upload the .xxx to preview and download as PES/DST/JEF without installing software. Technical details
deep spec| Format type | Binary machine-embroidery stitch file |
| Developer / origin | Compucon (Singer EOS and Singer Professional Sew Ware / PSW) |
| MIME type | application/octet-stream |
| File signature (magic bytes) | 0x7F 0x00 at file offset 0 (proprietary, reverse-engineered) |
| Binary structure | Proprietary header + sequential stitch list + indexed color table |
| Stitch coordinate encoding | Absolute stitch coordinates, typically in 0.1 mm increments |
| Stitch commands | Running stitch, jump, trim, and color-change commands |
| Color data | Indexed thread-color table embedded within the file |
| Specification status | Proprietary; no official spec published - decoded by reverse engineering |
| Open-source support | pyembroidery library; Ink/Stitch extension for Inkscape |
| Encoding | Binary (not human-readable) |
| Platform origin | Windows (Singer PSW / Compucon EOS software) |
| Primary use | Singer-brand and Compucon-compatible computerized embroidery machines |
| Related embroidery formats | .PES (Brother), .DST (Tajima), .JEF (Janome), .VP3 (Husqvarna/Viking) |
| Released | Compucon EOS / Singer PSW embroidery software (Singer Professional Sew Ware) |
XXX conversions
Community Q&A
asked by usersNo questions yet - be the first to ask about XXX files.
