File Preparation Guide

Create the perfect
sublimation file

Everything you need to know about preparing artwork for dye sublimation printing on textiles — so your blankets, rugs, towels, and totes come out exactly the way you designed them.

🛏️ Blankets
🪑 Rugs
🏖️ Towels
👜 Totes

File Format

Always save as PNG

Dye sublimation printing transfers your design onto the fabric using heat and pressure — which means every pixel matters. Save your file as a PNG to preserve the full color range and any transparency in your design.


JPG files compress your image and introduce artifacts that show up in the final print. For full-bleed products like blankets and rugs where the design runs edge to edge, even minor compression artifacts are visible on the finished product.

💡 Tip

If you're working in Adobe Photoshop or Illustrator, export using File → Export → Export As → PNG rather than Save As. This gives you more control over compression and color settings.

Color Space

Design in sRGB

Sublimation printers use a dye-based process that translates RGB color values into ink deposited directly into the fabric fibers. Design in the sRGB IEC61966-2.1 color profile — this is what our system reads and what produces the most accurate color output.


Our printers convert your file from sRGB to the printer's native color space during production. Designing in sRGB from the start ensures that conversion is as clean as possible and that the colors you see on screen are as close as possible to what you'll hold in your hands.

✓ Do this
  • Use sRGB IEC61966-2.1 color profile
  • Use rich, saturated colors — sublimation handles vibrant hues beautifully
  • Proof colors on a calibrated monitor when possible
  • Use full-spectrum gradients freely — sublimation reproduces them smoothly
✗ Avoid this
  • Designing in CMYK (will shift colors on conversion)
  • Using neon or fluorescent colors — they fall outside the printable gamut
  • Relying on your uncalibrated phone screen to judge color accuracy
  • Expecting an exact match to your screen — slight variation is normal

Resolution

Use the right DPI

DPI (dots per inch) determines how sharp your design prints at its final size. For most sublimation textiles, we require a minimum of 150 DPI at full print size. For smaller products like tote bags, aim for 300 DPI for the crispest result.


The most common mistake: designing at the right DPI, then scaling the file up in size — which cuts the DPI in half and produces a blurry print. Always check your DPI after any size change.

Product Minimum DPI Recommended DPI Notes
Blankets 150 DPI 150–200 DPI Full bleed — design must extend to all edgesAvoid thin lines under 2pt at full size
Rugs 150 DPI 150–200 DPI Pile texture softens fine detailBold graphics and large patterns work best
Towels 150 DPI 200–300 DPI Terry cloth absorbs more inkUse high contrast designs for best result
Tote Bags 150 DPI 300 DPI Smaller print area — resolution matters moreText should be bold and no smaller than 12pt
⚠️ Watch out

If you resize your design after setting the DPI, always check that the DPI hasn't dropped below the minimum. In Photoshop: Image → Image Size — make sure "Resample" is checked and DPI stays at or above 150.

Fabric & Material

How fabric affects your print

Dye sublimation works by bonding ink directly into the fibers of the fabric. This process only works on synthetic or synthetic-blend materials — specifically polyester. The higher the polyester content, the more vibrant and accurate the colors.


Unlike DTG printing on cotton, sublimation on poly gives you true edge-to-edge coverage with no white gaps or fading over time. Understanding the fabric helps you set the right expectations for your designs.

⭐

100% Polyester

The gold standard for sublimation. Colors are vivid, sharp, and wash-resistant. Full-bleed designs look exactly as intended. All Prinstant sublimation blankets use a high-quality poly face fabric.

Best results
🧶

Poly-Cotton Blends

The cotton fibers don't absorb sublimation ink, so designs appear slightly faded or washed out compared to 100% poly. Works well for designs that intentionally want a vintage or muted feel.

Slightly faded result
🏖️

Terry Cloth Towels

The looped pile of terry cloth absorbs more ink and softens fine detail. Use bold, high-contrast designs with no small text. Large graphics and simple patterns print best on terry towels.

Bold designs only
🪨

Rug Face Fabric

The pile texture of rugs means fine details, thin lines, and small text will lose definition. Design with large shapes, strong contrast, and patterns rather than detailed illustrations or typography.

Large patterns best
🚫 Important

Sublimation ink does not bond to cotton fibers. A design submitted for a 100% cotton product will result in a faded, washed-out print that degrades quickly. Always confirm the fabric content of your chosen product before uploading your design.

Pre-Upload Checklist

Before you upload.

File readiness checklist

  • 1
    File format is PNG — not JPG, TIFF, or PDF
  • 2
    Color profile is sRGB IEC61966-2.1 — not CMYK or Adobe RGB
  • 3
    DPI is at or above 150 at the final print size (300 DPI for totes)
  • 4
    Design extends to the bleed line on all edges for full-bleed products
  • 5
    Text is at least 12pt bold — smaller text won't be legible on textured fabrics
  • 6
    No neon or out-of-gamut colors — these shift unpredictably in production
  • 7
    File size is under 200MB — larger files may timeout during upload
  • 8
    You've ordered a sample — always proof a physical product before selling

Common Questions

Sublimation FAQ.

Why does my printed color look different from my screen?
Screens emit light and display a wider color range than any printer can reproduce on fabric. Sublimation printing is one of the most color-accurate methods available, but a small shift is always expected — especially with very bright or very muted colors. Designing in sRGB, ordering a sample, and calibrating your monitor are the best ways to close that gap.
Can I print white ink with sublimation?
No. Sublimation dye is transparent — it tints the fabric rather than coating it. White areas in your design will simply show the base fabric color. On white or light polyester products, this means white stays white. On dark fabrics, sublimation printing is not effective — the design will barely be visible.
What's the maximum file size I can upload?
We accept files up to 200MB. For large blanket and rug files at 150+ DPI, you may get close to this limit. If your file exceeds 200MB, try flattening all layers and re-exporting as a PNG with maximum compression — this reduces file size without affecting print quality.
Will my design fade after washing?
Sublimation ink bonds into the fabric fibers rather than sitting on top, which makes it significantly more wash-resistant than screen printing or DTG. With proper care (cold wash, tumble dry low, no bleach), sublimation prints maintain their vibrancy through hundreds of wash cycles.
Can I use a photo as my design?
Yes, and sublimation handles photographic images beautifully, especially on blankets. Make sure the photo is high resolution (at least 150 DPI at print size) and in sRGB color profile. Avoid very dark photos on dark backgrounds, as shadow detail can get lost in production.
Does Prinstant review my file before printing?
Yes. We conduct a pre-production art review on every new SKU before the first order ships. If we spot a resolution issue, color profile mismatch, or bleed problem, we'll flag it and work with you to correct it before anything goes to press.

Ready to start your first order?

Our team reviews every file before it goes to press. Upload your design and we'll flag any issues before production starts.

Get Started