Short answer
The best resolution for sublimation is 300 DPI at the real print size of your blank. Multiply the template's inches by 300 to get the pixels you need: an 11 oz mug wrap of 8.5 × 3.5 inches needs 2,550 × 1,050 px, and a 20 oz skinny tumbler wrap needs about 2,798 × 2,438 px. If your image is smaller, enlarge it before you mirror and print.
Key points
- Design at 300 DPI at the blank's real print size. Inches × 300 = the pixels you need.
- Templates vary by brand, so measure your blank or use the maker's template.
- Too small? Upscale first, then mirror last, just before you print.
- Design in RGB and judge color on a pressed test piece, not on the paper.
- Blur after pressing can come from the press. Ghosting means the paper moved.
The short answer: 300 DPI at blank size
For sublimation, make your file 300 DPI at the exact size it will print on the blank. A mug, tumbler or shirt panel each has its own print area, so the pixels you need change with the blank.
The sum is simple: inches × 300 = pixels. A design 8.5 inches wide needs 8.5 × 300 = 2,550 pixels across. If your file has fewer, it will print soft, however sharp it looks on your phone.
Searchers write DPI, but image editors call the same thing PPI (pixels per inch). For this guide they mean the same thing.
Example: Craftgineer points out that a 600 px logo stretched across an 11 inch mug wrap works out at about 55 DPI (600 ÷ 11 = 54.5). It needs about five times the pixels to reach 300 DPI.
Pixel sizes by blank
These are common template sizes from blank makers and template guides, worked out at 300 DPI. Brands differ: PrintSizer notes that mugs vary by up to a quarter inch in both directions, because "11 oz" is a capacity, not a size. Use the template that came with your blank whenever you have one.
| Blank | Print area | Pixels at 300 DPI | Megapixels |
|---|---|---|---|
| 11 oz mug, full wrap | 8.5 × 3.5 in (21.6 × 8.9 cm) | 2,550 × 1,050 | 2.7 |
| 15 oz mug, full wrap | 8.75 × 4.25 in (22.2 × 10.8 cm) | 2,625 × 1,275 | 3.3 |
| 20 oz skinny tumbler (MakerFlo) | 9.325 × 8.125 in (23.7 × 20.6 cm) | 2,798 × 2,438 | 6.8 |
| 30 oz skinny tumbler (MakerFlo) | 10.3 × 9.6 in (26.2 × 24.4 cm) | 3,090 × 2,880 | 8.9 |
| Letter sheet, full print | 8.5 × 11 in (21.6 × 27.9 cm) | 2,550 × 3,300 | 8.4 |
| Shirt front | 10 × 12 in (25.4 × 30.5 cm) | 3,000 × 3,600 | 10.8 |
Checked: Oct 2026. MakerFlo also lists 14 oz, 20 oz thick, 30 oz thick and 40 oz templates on its template page.
Silhouette School's 20 oz tumbler tutorial simply fills a whole 8.5 × 11 inch letter sheet at 300 DPI, using the 11 inch side to wrap around the cup. That is why the letter-sheet row is a handy size to keep.
For any other blank (a mouse pad, a slate, a coaster), measure the print area and multiply each side by 300. Our fabric DPI calculator does the sum for you in inches or cm.
File problem or press problem?
Before you change the file, work out what kind of fault you are looking at. The Country Chic Cottage lists the usual sublimation problems, and only some of them come from the image.
| What you see | Likely cause | Fix |
|---|---|---|
| Soft edges, blocky or jagged lines | Too few pixels for the print size | Enlarge the file to 300 DPI at blank size |
| Blur on a file that was sharp | Too much time or heat | Follow the blank maker's time and temperature |
| A double, shadowed image | Ghosting: the paper moved while pressing | Tape the transfer down firmly |
| Faded or dull colors | Too little time, heat or pressure | Adjust the press settings |
| Horizontal lines | Banding from clogged nozzles or a wrong paper setting | Clean the printer, check the media setting |
Tip: Zoom the file to 100% on your computer before you print. If edges look soft or steppy there, the press cannot fix it.
Too small? Upscale first, then mirror
If your file has fewer pixels than the table asks for, enlarge it before anything else. Typing 300 into the resolution box without adding pixels only changes a label. AI upscaling adds new pixels and redraws edges and texture, so the larger file stays crisp. The upscale an image 800% guide explains 4× and 8× in detail.
Craftgineer's advice is to mirror last, so you never flip a design twice by mistake. Here is the order that works:
- Find your blank's print area and work out the pixels you need.
- Divide the pixels you need by the pixels you have. If the answer is 4 or less, use 4×. Between 4 and 8, use 8×.
- Upload the image to the Image Upscaler and download the PNG. It comes tagged 300 DPI, and a transparent background stays transparent.
- Place the PNG on your blank's template and crop or resize it to the exact print area.
- Mirror the design, then print on the coated side of the sublimation paper.
Example: A 700 × 700 px AI art image going on a 20 oz skinny tumbler (2,798 × 2,438 px). 2,798 ÷ 700 = 4.0, so 4× is enough: it gives 2,800 × 2,800 px. Crop the height down to 2,438 px on the template and you are ready to mirror.
Free upscaling goes up to 36 megapixels, so free 4× works for images up to about 1,500 × 1,500 px and free 8× up to about 750 × 750 px. Every blank in the table above needs 11 MP or less, well inside that limit. A free account is needed to upscale your own designs.
Color: RGB in, judge after pressing
Sawgrass's sublimation guide explains that ICC profiles convert the RGB colors on your screen into the printer's CMYK inks. So most desktop setups expect an RGB file, and the profile handles the conversion. If you use a RIP, follow the RIP's own color setup.
Printed sublimation paper looks dull and washed out. The color only appears once the ink turns to gas and bonds with the blank, so Craftgineer warns against correcting color from the printout. Press a test swatch on the real blank and judge that.
Note: There is no white sublimation ink. White areas in your design print as no ink at all, so they show the color of the blank. On a white mug that looks white; on a colored or clear blank it does not.
If the pressed color still looks different from your screen, see why print color looks different from the screen.
Four checks before you print
- The file matches the blank's print area at 300 DPI. Check it with our guide to checking an image's DPI.
- It is saved as PNG, not a re-saved JPG. The TIFF vs JPG vs PNG guide covers why.
- The design is mirrored once, as the very last step, if it has text or a direction.
- One test swatch has been pressed on the same blank and paper before the batch.
What to do next
Find your blank's print area, multiply by 300, and compare that with your image's pixels. If the image is short, upload it to the free Image Upscaler, choose 4× or 8×, and place the 300 DPI PNG on your template before you mirror and print.
Questions people ask
Is 300 DPI good for sublimation?
Yes. 300 DPI at the finished size is the usual target, and Sawgrass's sublimation guide says 300 dpi is usually enough for day-to-day printing. Going higher adds file size without a visible gain on most blanks.
What size should a 20 oz tumbler sublimation design be?
It depends on the tumbler. MakerFlo lists 9.325 × 8.125 inches for its 20 oz skinny tumbler, which is about 2,798 × 2,438 px at 300 DPI. Use the template from the maker of your blank.
Can I use a 72 DPI image for sublimation?
Only if it has enough pixels for the print size. Changing 72 to 300 in the DPI box adds no pixels. Count the pixels, and if there are too few, enlarge the image with an upscaler before you print.
Why is my sublimation print blurry when the file looked sharp?
If the file has enough pixels, look at the press. Too much time or heat can blur a transfer, and paper that shifts during pressing gives a double image called ghosting.
Should sublimation files be PNG or JPG?
PNG is the safer choice. It keeps every pixel and supports a transparent background, while JPG adds compression blocks each time it is saved.