"What DPI should my file be?" is the most common question in textile file prep, and almost every answer you will read online is incomplete. "300 DPI" is the usual response, and it is correct only for one category of textile printing. Different processes have different requirements, and submitting 300 DPI when the process wants 360 (or vice versa) introduces its own problems.
This guide breaks down the right DPI for each textile printing process, explains the math behind the numbers, and shows how to avoid the most common misunderstanding: checking DPI in isolation from print size.
What DPI Actually Means in Textile Production
Before the numbers: DPI in a file-prep context means pixels per inch at the final printed size. Not at whatever size the file happens to be saved at. This distinction is the single most common source of blurry fabric prints.
A file saved at 300 DPI on a 10cm × 10cm canvas is a 1,181 × 1,181 pixel image. Scaled to print at 1 meter × 1 meter, its effective DPI drops to 30 — completely unsuitable for textile. The file did not get smaller; the pixels-per-inch at output did. The math moves against you whenever the print size exceeds the canvas size.
The practical rule: always calculate effective DPI at the output size before deciding if a file is ready.
Digital Textile Printing: 300 DPI at Final Size
Digital textile printing covers direct-to-film (DTF), direct-to-garment (DTG), dye-sublimation, and digital pigment printing. These processes use inkjet-style print heads with high native resolution (typically 1440 × 720 DPI hardware output) and can reproduce fine gradients accurately.
For these processes: 300 DPI at final print dimensions is the standard. Lower risks visible softness; higher is wasted data that the RIP will resample down anyway.
Pixel calculation examples:
- A 20cm × 20cm DTG print needs 2,362 × 2,362 pixels minimum
- A 40cm × 60cm sublimation panel needs 4,724 × 7,087 pixels
- A 1.5-meter-wide digital textile roll print needs 17,717 pixels across the width
For DTG on cotton, 300 DPI is slightly forgiving — the cotton fiber itself spreads the ink and softens fine detail. Files at 240–250 DPI can pass acceptably for apparel. Sublimation on smooth polyester is the opposite: it reproduces detail almost exactly, so 300 DPI is a hard minimum.
Rotary Screen Printing: 360 DPI
Rotary screen printing uses cylindrical screens with fine line ruling — typically 40 to 120 lines per inch. The RIP converts your artwork into a halftone dot pattern at that ruling. For clean halftone reproduction without moiré, the input file should have roughly 3× the pixel density of the halftone line ruling.
At the common 120 LPI screen ruling, that math gives you 360 DPI as the target input resolution. Some high-end rotary work at 150+ LPI pushes the target to 450 DPI.
Practical examples:
- A 64cm vertical repeat rotary design at 360 DPI = 9,071 pixels tall per repeat
- A 140cm print width × 64cm repeat at 360 DPI = about 19,843 × 9,071 pixels per tile
Large files, but rotary output is usually at bolt scale where the detail matters. Submitting 300 DPI to a rotary printer will often work — the RIP interpolates — but introduces visible banding in gradient areas and soft edges on fine line work. If the printer specifies 360 DPI, deliver 360 DPI.
Flat Screen and Hand Screen: 150–200 DPI
Traditional flat screen printing and hand screen printing use coarser meshes (typically 80–120 mesh count) and the physical screen itself limits how much detail can be reproduced. Supplying a 300 DPI file to a hand screen printer is not harmful, but it does not improve the result. The screen mesh is the bottleneck.
For these processes, 150–200 DPI at final size is comfortable, with 180 DPI being the common middle ground. Artwork is often prepared as separated color layers (one file per screen) rather than full CMYK.
See our separate guide on color separation for screen printing for how screen printing changes file structure, not just resolution.
Sublimation Banners and Soft Signage: 150 DPI
Large-format soft signage — banners, flags, backdrops — benefits from lower DPI because viewing distance is greater. A 3-meter banner viewed from 5 meters away does not need the same pixel density as a 30cm cushion viewed at arm's length.
The industry convention: 150 DPI at final size for soft signage, occasionally dropping to 100 DPI for very large (>5m) pieces where no one will ever view from closer than 10m. Any higher wastes file size with no visible quality gain.
Quick Reference Table
| Process | Target DPI | Notes |
|---|---|---|
| Dye Sublimation (smooth polyester) | 300 | Hard minimum — cloth shows every pixel |
| DTF (direct-to-film) | 300 | Standard for apparel transfer |
| DTG (direct-to-garment cotton) | 240–300 | Cotton softens ink slightly |
| Digital pigment (roll printing) | 300–360 | Match printer spec |
| Rotary screen (fine) | 360 | For 120 LPI screens |
| Rotary screen (very fine) | 450 | For 150+ LPI screens |
| Flat / hand screen | 150–200 | Mesh count limits detail anyway |
| Soft signage (banners, flags) | 150 | Viewing distance tolerates lower |
| Large soft signage (>5m) | 100 | Never viewed close up |
How to Calculate Pixels From Print Size
The formula is straightforward: pixels needed = print dimension in inches × target DPI.
To convert from centimeters: multiply cm by 0.3937 to get inches first.
Examples:
- 40cm × 300 DPI → 15.75 inches × 300 = 4,724 pixels
- 150cm × 360 DPI → 59.05 inches × 360 = 21,260 pixels
- 280cm × 150 DPI (banner) → 110.24 inches × 150 = 16,535 pixels
Most design software will tell you the current effective resolution when you set the document size. If not, do the division: pixel width ÷ print inches = effective DPI.
When Low DPI Is Actually Acceptable
Not every textile product needs maximum resolution. Products with tolerant viewing conditions or forgiving materials:
- Pile fabrics (velvet, terry) — the pile itself softens detail, lower DPI passes
- Loose weaves and knits — the yarn structure limits reproducible detail
- Backdrops and curtains viewed from a distance
- Garment linings — usually not seen close up
For crisp prints, tight weaves, small motifs, or anything in the hand-of-the-customer (scarves, pocket squares, neckties), target the full process DPI. Nothing tolerates softness at close viewing distance.
What to Read Next
DPI is one of four things every textile file has to get right. For the full checklist including color space, file format, and repeat geometry, see the complete textile artwork prep guide.
For a technical reference on halftone screen ruling (LPI) and input resolution, FESPA's technical library has detailed process documentation for every major textile printing method.
If you are working with a file below your target DPI and the client cannot supply a higher-resolution source, see our guide on fixing blurry textile designs before printing for AI-based recovery techniques.
