Embroidery machine not reading your USB stick or design: fixes

When an embroidery machine ignores a USB stick or a design file, the cause is usually one of six things: a stick the machine does not accept or that is not formatted FAT32, a file type the machine cannot read, a file in the wrong place on the stick, a file name with odd characters, a design larger than the field or over the stitch limit, or a damaged or zipped download. Work through them in that order, starting with a different small stick formatted FAT32. Your machine's manual lists the exact file types and design size it accepts.

If your embroidery machine will not read a USB stick, or reads the stick but shows no designs, the fault is usually in one of six places: the stick, its format, the file type, where the file sits, the file name, or the design itself. Work through the checks below in order.

This guide leans on Brother and Baby Lock manuals and support pages, because they spell out the USB rules in detail. This site is not affiliated with Brother, Baby Lock, Janome, Singer or any other maker. Your own manual is the final word on your model.

Quick checklist

Try a different, small USB stick.
Format the stick as FAT32 (copy your files off first, because formatting erases it).
Check the file extension against the types your machine reads.
Put the design at the top level of the stick, not inside folders.
Rename the file with only letters, numbers, hyphens and underscores.
Check that the design fits the machine’s field and is under its stitch limit.
Download or export the file again, and unzip it first.

The stick: format and size

Start here, because a stick the machine will not accept hides everything else. Brother’s support page for its Luminaire XP1 (listed there as the Innov-is XP1) says a USB drive must use the FAT (FAT32) file system, and that a drive formatted any other way cannot be used. Brother’s manuals for the PE900 and SE700 add that some commercially available sticks will not work with the machine at all, and the screen then says “This USB media cannot be used.” The Luminaire page suggests trying a different drive.

None of the Brother pages we read names a maximum stick size. Size matters mostly because of formatting. Apple’s Disk Utility help says to use MS-DOS (FAT) for Windows volumes of 32 GB or less and exFAT for those over 32 GB. Many large sticks arrive formatted as exFAT or NTFS, which a machine that wants FAT32 cannot read. Embroidery files are small, so you do not need much space. A plain stick of 32 GB or less, formatted FAT32, is the easiest place to start. That 32 GB figure is our practical advice, not a rule from Brother.

To format the stick:

Copy anything you want to keep onto your computer. Formatting erases the stick.
Windows: open File Explorer, right-click the stick, choose Format, set File system to FAT32, then start. Check the drive letter first so you do not wipe the wrong drive. If FAT32 is not offered, the stick is probably too large for Windows’ built-in tool, so use a smaller one.
Mac: open Disk Utility, select the stick, choose Erase, and set the format to MS-DOS (FAT).
Copy your designs back on, then eject the stick from the computer before you pull it out.

If your machine takes SD cards, Brother’s Luminaire page says SD and SDHC cards work and SDXC cards do not.

Two small habits help. Brother’s manuals say to put nothing but a USB flash drive into the port, because anything else may damage the machine. And give the machine a few seconds to read the stick. Brother’s support page for the single-needle PRS100 says recognition takes about 5 to 6 seconds, and speed varies with the port used and how much data is stored. If your machine has two USB ports, try the other one.

The file type: what your machine can read

A machine only lists files it understands. Here is what the manuals we read give for a few common models.

Machine	File types listed	Largest design	Stitch limit per design
Brother PE900	.pes, .phc, .dst, .pen	about 7.1 × 5.1 in (180 × 130 mm)	200,000
Brother SE700 and SE725	.pes, .phc, .dst, .pen	4 × 4 in (100 × 100 mm)	100,000
Brother NQ1700E	.pes, .phc, .pen, .dst	about 10.2 × 6.3 in (260 × 160 mm)	not given
Baby Lock Flare	.pes, .phc, .dst	about 10.2 × 6.3 in (260 × 160 mm)	not given
Brother Luminaire XP1	.pes, .pha, .phb, .phc, .dst, .phx	about 16 × 10 5/8 in (408 × 272 mm)	about 750,000 stitches or 127 color changes

Brother’s file-format page also lists .pen files (from its iBroidery software) for the Luminaire XP1.

Other brands use other formats. Janome machines use JEF, and Husqvarna Viking and Pfaff machines use VP3. Singer varies by model: its page for the SE9180 names VP3 as the format to import. Always confirm in your manual. Our file formats page lists the main formats by brand.

Two points catch people out:

A renamed file is not a converted file. Changing .jef to .pes only changes the label. Brother’s manuals warn that data not saved by its own design systems may make the machine malfunction. Convert with software instead. Our guide to converting embroidery files shows how.
DST looks different. Brother’s manuals say a DST file appears in the list by file name only, with no picture, and a long name may be cut off. DST holds no thread colors, so the machine uses its default color order. Check the preview and change colors as needed. The PES format page covers Brother’s own format.

Folder depth: where the file sits

Brother’s own pages disagree on folders. A Brother US support page, which covers many models including the PE900 and NQ1700E, says that if embroidery data is in a folder on the stick, the machine cannot retrieve it. It tells you to save designs in the root, which means the top level of the stick.

The manuals for the PE900, SE700 and NQ1700E say something different: if the design you want is in a folder, touch or press the folder key to open it. The SE700 manual adds that the machine cannot create folders on the stick. When a machine saves a design to USB, the PE900 manual says it puts it in a folder labeled “bPocket.” We found no maximum folder depth in any Brother page or manual we read.

So the safe rule is simple. Put your designs at the top level of the stick. If you want folders, keep them one level deep and check that your machine lists them.

File names: length and characters

Brother’s support page says a name with special characters may not be recognized, so the file does not show. It recommends letters A to Z in upper or lower case, the digits 0 to 9, hyphens and underscores. Its manuals say the same for folder names.

Anything outside that list, such as spaces, accents, brackets or ampersands, is a risk. A name like “Rose Border (final).pes” is a likely culprit. Rename it to “rose-border-final.pes” and try again.

Brother gives no maximum name length in the pages we read. It does say the machine may cut long DST names short on the screen. Keep names short and put the part that tells designs apart first, so two files do not look identical in the list.

Design bigger than the field, or too dense

A design that does not fit the machine’s embroidery field will not load or will not stitch. Brother’s support page says designs must fit the field, and a machine with a 7 × 5 in field asks whether to rotate a too-large design 90 degrees. The page does not say what happens if it still does not fit, so shrink or split the design.

The hoop matters too. On the PE900, when frame identification is on, a design larger than the hoop you have chosen brings up “Pattern extends to the outside of embroidery frame” and asks for a larger frame.

Stitch and color limits are the other cause. Brother says a .pes file over the limits for stitches, colors or combined patterns will not display, and the fix is to edit it in Brother’s own design software. The table above shows the limits we found for some machines. A very large, dense design can pass the limit on a smaller machine.

What to do:

Find your machine’s field in the manual, then use our will-it-fit tool to compare it with the design size.
Shrink the design a little in software, or ask the designer for a smaller version that fits your field.
For a design that is simply too large, split it into sections and stitch them in turn.

Our guide to the design too big message goes deeper on this one.

Corrupted, zipped or incomplete downloads

A file can look fine on your computer and still fail on the machine. Brother’s Luminaire page says zipped files must be unzipped first, and that if data seems corrupted you should save it again. Brother’s PE900 manual has a message, “Cannot recognize the data for the selected pattern,” and says the cause may be damaged data or data made with another maker’s design system. Its “This pattern cannot be used” message can also mean corrupted data.

Signs of a bad file:

The file size is 0 KB or only a few bytes.
The file still ends in .zip, or sits inside a zipped folder.
The download was interrupted, or the page saved as a web file instead of a design.
The design will not open in embroidery software either.

To fix it, download the file again from the seller, unzip it, and copy it onto the stick. If your software can open the design, export it again as a clean file in the format your machine reads. A clean export from embroidery software is safer than a file renamed by hand.

If it still does not work

Test the stick another way. If your machine can save designs to USB, save a built-in design to the stick, then open the stick on your computer. If the machine writes the file and reads it back, the stick is fine and the problem is your downloaded file.
Try another design from a different source. If that loads, the first file was the problem.
Use another route. Models with wireless can take designs from software or an app instead. See our guide to transferring designs to an embroidery machine.
Contact the maker or your dealer. Brother’s manuals send you to an authorized dealer or service center when an error message keeps coming back.

Write the working stick, the folder layout and the file name style on a sticky note. It saves you repeating these checks the next time.

Frequently asked questions

What format should a USB stick be for an embroidery machine?

FAT32 is the safe choice. Brother's support page for its Luminaire XP1 says the drive must use FAT (FAT32) and that a drive with any other file system cannot be used. Check your own manual, because older and newer models can differ.

Is there a maximum USB stick size for an embroidery machine?

None of the Brother pages and manuals we read names a maximum. They say only that some sticks on the market do not work. In practice, a stick of 32 GB or smaller is easiest to format as FAT32, because Apple's Disk Utility help lists MS-DOS (FAT) for Windows-compatible volumes of 32 GB or less and exFAT above that.

Can I put embroidery files in folders on the USB stick?

Brother's own sources disagree. A support page covering many models says a design inside a folder cannot be retrieved and tells you to save to the top level of the stick, while manuals for the PE900, SE700 and NQ1700E say you use the folder key to open a folder. The top level is the safe place.

Why does my Brother machine not show my PES file?

Brother lists a file name with special characters, a zipped file, a file in a folder, a design too big for the field, and a design over the stitch or color limit. Also try another stick, since some drives are not usable with the machine.

Can I rename a DST or JEF file to .pes?

No. Renaming changes the label, not the data inside, and Brother warns that data not saved by its own design systems can make the machine malfunction. Convert the file with embroidery software instead.