Embroidery File Formats Guide: DST, PES, EXP & Images

Your embroidery machine can't read a JPG. It can't read a PNG either. This is the single most important fact to understand about embroidery files. A picture shows how a design looks; a stitch file tells the machine exactly how to sew it. One is a photograph of a cake, the other is the recipe.

In everyday product listings and tutorials, embroidery files are often called embroidery patterns or simply embroidery files. Those names are fine for conversation, but they hide an important technical distinction: only a stitch file—not an image file—can be sewn by a machine. This guide explains that distinction, the two separate file worlds you'll encounter, where HTVRONT IdeaStudio fits in, and the one resizing rule you shouldn't ignore.

What Is the Difference Between a Stitch File and an Image File?

Embroidery workflows involve two completely separate file types, and confusing them is the most common source of frustration for beginners.

Stitch files (also called machine files, or informally "embroidery files" or "embroidery patterns") contain the actual needle positions, color change commands, and movement instructions the embroidery machine executes. They are the only files a machine can run directly. Common stitch formats include DST, DSB, PES, EXP, JEF, and VP3. For a broader overview of the field, see machine embroidery on Wikipedia.

Image files are visual artwork—photographs, logos, illustrations. They describe what a design looks like, pixel by pixel or path by path. Your embroidery machine cannot read them. They must first be converted into stitch data through a process called digitizing. Only then does the image become something the needle can follow.

A third category, source files (like Wilcom EMB or Hatch HES), sit in between. These are editable digitizing work files that preserve objects, stitch types, and settings, allowing clean resizing and edits. But most machines cannot sew them directly—they must be exported to a stitch format first.

What Is DST?

DST is the most widely read commercial embroidery format in the world, developed by Tajima. A DST file consists of a 512-byte text header followed by 3-byte records; each record moves the needle in steps of 0.1 mm, and control bits distinguish normal stitches, jumps, and color changes. It contains stitch commands and metadata, telling the machine exactly where to place every stitch, in what order, and when to stop for a thread change.

The trade-off is information loss. DST stores needle positions and movement commands, but it does not store accurate thread colors. Your machine will display the design in a default color sequence, and you must manually assign the actual thread colors. DST also handles jump stitches differently—it has no explicit trim command, so trims are typically inferred from jump sequences or handled by machine settings. This is why jump stitch and trim behavior can vary between DST and other formats.

DST is the safest "will it run?" choice, but it is not the most informative.

What Is DSB?

DSB is another stitch format associated with Tajima commercial machines, and it is one of the formats the E15 can execute directly. Like DST, a DSB file records stitch paths, the order of color blocks, and machine commands such as color changes and trims—but it does not carry accurate thread-color data. The file tells the machine when to change needles; it does not tell the machine which physical thread color is loaded on each needle.

This is the key point to understand about both DST and DSB: they are instruction files, not color-accurate design files. If you load a raw DSB or DST file without a needle sequence, the machine has no way to know that needle 1 should be black and needle 2 should be red. That information has to come from somewhere else—either from a needle-sequence configuration sent alongside the file, or from manual assignment on the machine.

DSB is not inherently "better" or "worse" than DST; it is simply another machine-facing format. The practical question is whether your workflow supplies the missing color information. For E15 users, that happens either through IdeaStudio's needle-sequence configuration or through manual confirmation on the E15 screen.

What Is PES?

PES is the native format for Brother and Baby Lock machines. It is one of the most feature-rich home embroidery formats, preserving color information and more metadata than commercial formats like DST.

PES files contain sewing coordinates for stitches and corresponding thread colors. Older PES versions and the embedded PEC format rely on a fixed predefined thread palette; newer PES versions store configurable thread data that can include an RGB color, brand, description, and catalog number. This means a PES file can carry its intended palette rather than relying on a default sequence.

If you sew on a Brother or Baby Lock, PES is your best choice for color-accurate previews and smoother workflow. But remember: even a feature-rich stitch file is still a flattened set of stitch commands, not an editable design file.

What Is EXP?

EXP is associated with Melco commercial machines and is also read by Bernina machines. But "EXP" is not a single uniform format—there are two variants, and this distinction matters.

According to embroidery supplier OESD's technical documentation:

• Melco EXP is the commercial format with no thread colors—it pulls whatever default colors the software assigns, which can turn a blue design green or red.
• Bernina USB EXP is the home-machine format that does contain thread colors that match the color chart. A Bernina USB EXP is actually three files: the EXP design file, an INF file for thread colors, and a BMP file for the on-screen preview.

Melco machines also read DST, so EXP is rarely a barrier in mixed-brand commercial environments. But if color accuracy matters, you need to know which EXP variant you're working with.

What Are Other Stitch Formats?

Beyond DST, DSB, PES, and EXP, several brand-specific stitch formats exist. JEF is the default stitch format for Janome, Elna, and Kenmore machines. VP3 serves Husqvarna Viking and Pfaff. HUS and VIP are older Husqvarna formats. ART is Bernina's software-level format, and XXX is a legacy Singer/Compucon format that is now uncommon.

None of these change the fundamental rule: a stitch file is an instruction set, not a picture. Converting between stitch formats preserves the stitches but cannot add information that was never there—such as missing thread colors.

What Are Raster Image Formats?

Raster images are built from a grid of pixels. They describe color and appearance, not stitch paths. They must be digitized before embroidery. Raster graphics encode individual pixel values on a rectangular grid, in contrast to vector graphics, which use lines, points, and polygons.

JPG/JPEG uses lossy compression. JPEG's lossy compression looks for opportunities to make compression more efficient through tiny, often imperceptible alterations to the image data, encoding it as eight-by-eight blocks of pixels rather than individual pixels. It has no transparency and is best for photography. For embroidery source artwork, JPG is a weak starting point because compression artifacts blur crisp edges.

PNG uses lossless compression based on the DEFLATE algorithm. The official PNG specification states plainly: "There is no lossy compression in PNG." DEFLATE is a lossless data compression method combining LZ77 and Huffman coding. PNG also supports transparent backgrounds. This makes PNG a much better source for logo digitizing than JPG.

WEBP is a modern web format offering strong compression with transparency support. It is excellent for web optimization but not a standard embroidery input.

HEIF/HEIC is the default photo format on many iOS devices, introduced by Apple with iOS 11. It offers better compression than JPG at similar quality, but compatibility with embroidery software is limited.

GIF supports simple animation and a limited color palette. The format allows a single image to reference a palette of up to 256 distinct colors, and this color limitation makes GIF unsuitable for reproducing color photographs or continuous-tone images. It is not suitable for embroidery source artwork.

What Is SVG?

SVG is different. It describes shapes using mathematical paths rather than pixels, which means it can scale infinitely without losing sharpness. The W3C, which developed SVG as an open standard, defines it as "Scalable Vector Graphics, an XML grammar for stylable graphics" and explains that scalable means "not being limited to a single, fixed, pixel size." Vector graphics contain geometric objects such as lines and curves, giving greater flexibility than raster-only formats that must store information for every pixel.

For embroidery preparation, SVG is often a better starting point than raster images because its outlines are already defined mathematically. A digitizer can use those vector paths to create clean embroidery objects. However, SVG still is not a stitch file. It tells the software where the edges are, not where the needle goes.

What Is IdeaStudio's Role, and Why Does the 10% Rule Matter?

HTVRONT's IdeaStudio software bridges the gap between design files and the E15, a 15 needle embroidery machine. It allows you to import artwork and stitch files, preview designs on garments, adjust thread colors, and send finished files to the machine wirelessly.

IdeaStudio supports importing common image formats—including JPG, PNG, and SVG—for design preparation. Those images can also be sent to a sublimation printer or DTF printer for printed output. But this is where the two workflows split: an image file can be printed, but it cannot be embroidered. Embroidery requires an actual stitch file. IdeaStudio can import DST and DSB stitch files for direct execution on the E15, but it cannot turn a JPG or PNG into embroidery by itself.

Because DST and DSB do not store accurate thread colors, the needle sequence matters. In IdeaStudio, you can assign which needle bar holds which color and send the file with that needle-sequence configuration—so the E15 knows the intended color mapping when the job starts. If you copy a raw DST or DSB file to a USB drive and load it directly on the E15, that configuration is not included. In that case, you need to confirm or reassign the needle-bar colors on the E15 screen before stitching, or the machine may use a default or previous mapping and produce the wrong colors.

Here is the critical limitation when editing an existing stitch file: IdeaStudio allows proportional scaling, but you should not resize a stitch file by more than ±10%.

This is not a software restriction unique to IdeaStudio—it is a fundamental principle of embroidery file scaling. A flattened machine file contains only stitch-level data; when you proportionally scale it, the software typically transforms stitch coordinates, so the stitch count does not change. Because the same number of stitches is spread over a larger or smaller area, density increases or decreases with the design size. Scale down too far and the stitches bunch together, which can cause birdnesting, thread breaks, and visible distortion; scale up too far and the stitches spread apart, leaving thin, sparse coverage. A common industry guideline is to keep scaling within about ±10%. Design files that preserve editable objects can regenerate stitches and maintain density when scaled—but a flattened stitch file cannot.

If a design must be significantly larger or smaller, the correct approach is to re-digitize from the source artwork at the new size, not to scale the finished stitch file. Scaling is a convenience for minor adjustments, not a substitute for proper digitizing.

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