Drop your EXP file. We'll convert it to PES right here in your browser, your file never leaves your device.
Drop your file here
or click to pick from your device
How it works
Click the dropzone above or drag a EXP from your desktop. Files of any size, there's no upload, so there's no upload limit.
The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.
Get your PES the moment the conversion finishes. Convert another, or close the tab.
Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.
Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.
No account required. No watermark on the output. No queue. Open source, every line of conversion code is public.
Formats involved
EXP is Melco's expanded embroidery format (also used by Bernina Artista). Simplest of the major formats: no header, just a stream of 2-byte stitch deltas with control codes for jumps, color changes, and end-of-design. Universal compatibility because of the format's simplicity.
How to open
Melco DesignShop, Bernina Embroidery Software, Embird, Embroidermodder.
PES is Brother's native embroidery format, also used by Babylock and Bernina-XJ machines. The file embeds a PEC subsection containing the actual stitch data. PES is the format most embroidery design marketplaces (Etsy, Embroidery Library) ship with by default because Brother dominates the home/hobbyist market.
How to open
Brother and Babylock home machines (PE Design software, Brother Embroidery Box). Free: Embroidermodder, online PES viewers.
Related tools
How we compare
| Feature | Ustwineconvert | CloudConvert | iLovePDF | FreeConvert | Smallpdf |
|---|---|---|---|---|---|
| Files uploaded to a server | |||||
| Free file size limit | No limit | 1 GB | 200 MB | 1 GB | 5 GB |
| Free conversions per day | Unlimited | 10/day | Limited | Limited | 2/day |
| Signup required | |||||
| Watermark on output | |||||
| Open source | |||||
| Works offline (after first load) |
Last verified May 2026 from each competitor's pricing and FAQ pages. Limits and pricing change frequently.
FAQ
Yes. No signup, no watermark, no daily file count limit. The entire engine is open source, you can read the conversion code on GitHub.
Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.
Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.
Melco and Bernina industrial/professional embroidery. Brother home embroidery machine designs. The most common reason to convert is compatibility, PES works in places where EXP doesn't, or vice versa.
Melco DesignShop, Bernina Embroidery Software, Embird, Embroidermodder.
Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.
Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.