Free EMB File Viewer
Open a Wilcom EMB in your browser and see what is in it.
An EMB is Wilcom's working file: the editable master a digitizer builds a design in, not the file a machine sews. Wilcom saves a rendered preview and a list of the design's properties inside it, and this viewer reads both. It cannot open the design for editing or convert it, because that part of the file is Wilcom's own. Everything happens on your device and nothing is uploaded.
How an EMB can be read without Wilcom
An EMB is two things stacked. The design itself, the objects and outlines and settings a digitizer works with, is Wilcom's own format and has never been published. Around it sits an OLE2 compound file, which is a documented Microsoft container, the same one older Word and Excel files used.
Wilcom puts two readable things in that container. One is a rendered preview of the design, stored as an ordinary JPEG. The other is a standard property list holding the stitch count, colour count, trims, finished size, thread list and the machine the file was set up for. Neither needs any knowledge of Wilcom's format to read.
So the viewer opens the container, shows you the picture and the numbers, and stops. It does not try to interpret the design objects, because guessing at an undocumented format produces confident nonsense, and a wrong stitch count in front of someone quoting a job is worse than no stitch count.
Sizes are converted only when the file says how. An EMB stores its own unit conversion, millimetres and inches per internal unit. Where that is missing, or the two disagree, the viewer shows nothing rather than guess a scale.
Opening an EMB file (step by step)
- Add the file. Drop a .emb on the drop zone, or click to browse. It is read in your browser and never uploaded.
- Look at the design. Wilcom saves a rendered preview inside the file. That is what you see, not a redraw of the stitches.
- Read the numbers. Stitch count, finished size, colour blocks, trims, thread lengths and the machine the file was set up for.
- Check the threads. Each colour block lists the thread number and brand the digitizer used, in sewing order.
- Ask for the machine file. An EMB is the editable master. To sew it you need a DST, PES, EXP or JEF, which is a quick export in Wilcom.
What this viewer cannot do
- It cannot edit or resize the design. That needs Wilcom EmbroideryStudio, or Wilcom's own free TrueSizer for resizing and exporting.
- It cannot convert an EMB to DST or PES. Converting means re-generating stitches from Wilcom's objects, which only Wilcom can do. See exporting EMB to DST.
- The preview is Wilcom's, not ours. It is the picture saved in the file when it was last written, so it shows the design as it was then, at whatever size Wilcom rendered it.
- Thread numbers are what the file stores. That is what the digitizer chose in Wilcom, which is not always what you will sew it in. Check against a physical shade card, and use the thread colour matcher to cross to another brand.
- Some files carry less than others. Wilcom versions differ in what they store. Where a figure is missing, the viewer leaves it out rather than filling it in.
EMB file FAQ
Where the format details come from
- Microsoft MS-CFB: the Compound File Binary container an EMB is wrapped in
- Wilcom: EmbroideryStudio, which creates and edits EMB files
- Wilcom TrueSizer: Wilcom's own free viewer, for resizing and exporting an EMB
The container reader follows Microsoft's MS-CFB specification and is checked against compound files written by an independent implementation. Checked 25 September 2026.
Related free tools
Only have the EMB, and need it sewn?
Send us the EMB and tell us the machine format you need. We hand digitize and repair embroidery files, digitizing since 2015, and every file is checked by a second digitizer. Flat price per design, set by complexity: see the price list. Standard turnaround 4–8 hours, 24/7.