How to Fix Missing Bernina EXP Colors & Generate Companion INF Thread Files
Bernina sewing computers display raw .EXP designs in monochrome or random colors when companion .INF metadata files are missing.
Drag & Drop your embroidery file here, or browse files
Supports .PES, .JEF, .DST, .EXP, .VP3, .HUS, .XXX (Max 15MB)
Interactive 2D Stitch Simulator
Upload a .PES, .JEF, .DST, or .EXP file above to preview stitch coordinates, thread stops, and hoop bounds in real time.
Root Cause Diagnostic & Step-by-Step Fix
Technical explanation and proven solution verified by master embroidery technicians.
Melco/Bernina .EXP format is a raw stitch delta binary that does not store color palettes internally, requiring an external .INF sidecar file.
Actionable Steps to Resolve:
Convert your colored .PES or .JEF design into Bernina .EXP using ConvertStitch.
ConvertStitch automatically generates both the .EXP stitch file and the companion .INF thread sequence sheet.
Copy BOTH the .EXP file and .INF file into the root of your FAT32 USB flash drive with identical file names.
Insert into your Bernina 700 or 830 console; the screen will now populate with correct color change stops.
Microcontroller & Binary Parser Deep Diagnosis
Low-level hardware explanation: why sewing machine motherboards reject files or fault.
The Melco/Bernina .EXP format is a raw stitch delta stream containing only X,Y coordinates and jump/stop opcodes. Unlike Brother .PES which embeds a color palette, .EXP relies on a companion .INF sidecar file containing ASCII text thread brand and spool numbers. If the .INF file is absent from the USB drive, the Bernina 700 or 830 LCD defaults to monochrome grey or randomized factory presets.
Symptom-Based Troubleshooting Decision Tree
Match your exact machine behavior to the verified hardware or software resolution.
Bernina screen displays the design but all elements are monochrome black or grey.
The companion .INF color metadata file was not copied to the USB alongside the .EXP file.
Download the complete bundle from ConvertStitch and copy BOTH .EXP and .INF files to USB root.
Bernina screen shows colors, but they don't match the original artwork.
.INF file has generic thread numbers not mapped to your spool collection.
Use our Universal Thread Converter to match Isacord/Madeira codes and re-generate the .INF file.
Machine says 'File Corrupted' when selecting design.
.EXP and .INF filenames do not match exactly (e.g. 'design.exp' and 'DESIGN1.inf').
Ensure base filenames match character-for-character (e.g., 'LOGO.EXP' and 'LOGO.INF').
Critical Embroidery Mistakes to Avoid
Avoidable operator errors that damage needles, warp garments, or corrupt flash drives.
| Frequent Operator Mistake | Machine & Garment Consequence | Safe Engineering Prevention |
|---|---|---|
| Copying only the .EXP file to the USB stick without the .INF file | Machine loses all color information, forcing manual color assignment on screen. | Always copy BOTH .EXP and .INF companion files with identical names. |
| Renaming the .EXP file on the USB stick without renaming the .INF file | Firmware cannot associate the sidecar file with the stitch binary. | Keep identical filenames for both companion files. |
| Placing Bernina files inside deep nested subfolders | Older Bernina firmware cannot traverse multiple folder levels on USB. | Place .EXP and .INF pairs directly into the root directory of the FAT32 drive. |
Related Engineering Tools & Hardware Hubs
Interactive CAM calculators, manufacturer specifications, and sibling error resolutions.
Universal Thread Color Converter & Run Sheets
Convert Isacord and Madeira numbers into printable run sheets for Bernina machines.
Convert PES to DST Without Losing Colors
Understand raw CAM needle stop commands and commercial thread palette assignment.
Bernina 700 & 830 File Format Guide
Full guide on Bernina .EXP and companion .INF sidecar file requirements.
Hardware USB Transfer Guide: How to Load .exp onto Your Machine
Crucial drive formatting and folder placement steps for Bernina & Melco machines.
Embroidery machines cannot recognize modern exFAT or NTFS filesystems. Use a standard USB 2.0 drive (8GB–16GB recommended) and format it as FAT32 with Master Boot Record (MBR).
Bernina machines require the file placed in the root directory along with the companion .INF color palette file.
Always safely unmount or eject the USB stick from your operating system before unplugging. Premature disconnection corrupts embroidery jump tables.
One-click jump to reverse or companion conversions for PES:
Auto-digitize artwork or generate mockups for EXP:
Detailed compatibility guides for top embroidery hardware:
Fix common embroidery transfer and formatting errors:
Frequently Asked Questions: PES to EXP Conversion
Expert answers to technical embroidery machine and file format questions.
Drag and drop your .pes file into the ConvertStitch dropzone above. The conversion engine runs 100% inside your web browser via Web Workers and typed arrays. It immediately parses the stitch coordinates and creates a machine-ready .exp file for instant download.