FREE DPI CHECKER · NO UPLOAD

Check the DPI Before You Print It

A file that looks sharp on screen can print soft at 12 inches wide. Enter the pixel dimensions and the print size and this checker tells you the real resolution, using the same thresholds the Fill My Film app applies to every design.

Use the calculator ↓Build the sheet →

Planning estimates use the values you enter. They are not quotes, printer specifications or guaranteed MAX nesting results.

LIVE PLANNING TOOLNO UPLOAD
ENTER THE JOB YOUR VALUESCALCULATE IN YOUR BROWSERREVIEW THE RESULT PLANNING ESTIMATEBUILD THE SHEET FILL MY FILM
PLAN THE JOB✳PRICE THE OUTPUT✳REDUCE WASTE✳PRINT WITH CONFIDENCE✳PLAN THE JOB✳PRICE THE OUTPUT✳REDUCE WASTE✳PRINT WITH CONFIDENCE✳PLAN THE JOB✳PRICE THE OUTPUT✳REDUCE WASTE✳PRINT WITH CONFIDENCE✳PLAN THE JOB✳PRICE THE OUTPUT✳REDUCE WASTE✳PRINT WITH CONFIDENCE✳PLAN THE JOB✳PRICE THE OUTPUT✳REDUCE WASTE✳PRINT WITH CONFIDENCE✳

WHAT THIS CALCULATOR DOES

DTF DPI Checker

Effective DPI is pixel width divided by print width in inches. This checker runs that division, applies the app's verdict (under 150 fails, 150 to 219 warns, 220 and up passes) and shows the largest width that still meets 300 and 220 DPI, plus the pixels a file would need to pass at your size.

Enter the artwork and the print size

Pixels from the file, inches from the job. Results update as you type.

RESOLUTION VERDICT

Effective DPI at that size

EFFECTIVE DPI—
VERDICT—
PRINT HEIGHT—
MAX WIDTH AT 300 DPI—
MAX WIDTH AT 220 DPI—
PIXELS NEEDED AT 300 DPI—

Same thresholds as the Fill My Film app: under 150 DPI is flagged as too low to print, 150 to 219 as soft for small detail. The file's saved DPI tag is ignored on purpose; only pixels and inches count.

THE ONLY FORMULA

Effective DPI is pixels divided by printed inches

Every DPI question comes down to one division. Take the pixel width of the artwork and divide by the width in inches it will print at. The result is the real resolution of that print, and it changes every time the size changes.

That is why one file can be fine for a left-chest logo and unusable for a full back. The pixels did not change; the inches did.

  • Effective DPI = pixel width ÷ print width in inches
  • Height follows the same ratio if the aspect is kept
  • The file's saved DPI tag does not enter the formula

THE THRESHOLDS

Where the app draws the lines, and why not at 300

Fill My Film refuses nothing, but it labels. Under 150 DPI the print will look soft to a customer at arm's length and is likely to come back, so the app calls it an error. From 150 to 219 solid shapes survive and small type does not, so it warns. From 220 up it stays quiet.

The warning stops at 220 rather than 300 on purpose. A 250 DPI file of a bold two-colour logo prints well, and warning on every one of those trains operators to ignore the warning that matters.

  • Under 150: too low to print
  • 150 to 219: soft for small detail
  • 220 and up: no flag; 300 is the sheet default

FROM VERDICT TO FIX

Read the pixels-needed number, then go get them

When the checker fails a file, the useful output is the pixel width that would pass at the size you want. Ask the customer or the designer for that, or open the original file and export at that size.

Vector artwork sidesteps the problem. Fill My Film reads SVG, PDF, AI and EPS in the browser and renders them at the size you set, so a vector logo is sharp at any width.

  • Request the source file, not a bigger JPG
  • Export vectors at print size instead of a fixed pixel count
  • Re-check after any resize

USE THE RESULT

Continue planning the DTF job

NEXT 01Artwork Requirements →NEXT 02300 DPI Guide →NEXT 03File Formats →NEXT 04How to Make a Gang Sheet →

CALCULATOR QUESTIONS

Know what the estimate includes

What DPI do I need for DTF?

300 pixels per inch at the final print size is the common production standard. Fill My Film flags anything under 150 as too low to print and 150 to 219 as soft for small detail. Between 220 and 300 most solid artwork prints acceptably; fine text and thin lines benefit from the full 300.

Why does my 300 DPI file show a lower number here?

A DPI tag in the file describes an intended size, not the pixels it actually contains. Effective DPI is pixels divided by the inches you will print. A 1,200-pixel-wide file is 300 DPI at 4 inches and 100 DPI at 12 inches, whatever the tag says.

Can I fix a low DPI file by resampling it larger?

Resampling adds pixels without adding detail, so the checker would pass a file that still prints soft. Go back to the source: a vector file, the original layered document, or a re-export at the pixel size shown here.

Does this checker upload my artwork?

No. It uses the pixel dimensions you type. Nothing is sent anywhere. The Fill My Film app reads the real file, but decodes it in your browser and applies the same verdict.

PLAN IT · THEN PACK IT

Turn the estimate into a real gang sheet.

Set exact sizes and quantities, compare the nest and export the production PNG.

Open Fill My Film →