HomeLaser DPI and LPI converter
Laser DPI, LPI, and line-interval converter
DPI and LPI are the same idea for a laser: how many lines fit in an inch. The line interval is that spacing in millimeters. Change any one of them and the others follow, along with the pixel size of a job at the size you plan to engrave.
Exports SVG. See also Photo to laser engraving, Material test grid, Kerf test and calculator.
254.00 DPI
- Line interval
- 0.1000 mm
- Inches
- 0.00394 in
- Pixels at this size
- 1000 × 800
- A 1000 px side is
- 100.00 mm
The square is a scale check. It should measure 100 mm on each side after import.
Red paths cut. Blue paths score. Black paths engrave. Import at 100% scale.
How to use it
- If your software asks for a line interval, read the millimeter value here and type it there.
- 254 DPI is a 0.10 mm interval. 318 DPI is about 0.08 mm. 508 DPI is 0.05 mm.
- Enter the engraving width and height to see the pixel count the photo tool will export.
- Download the 100 mm square and import it. If it does not measure 100 mm, the software is rescaling the file.
Related tools
Questions
Are DPI and LPI different?
On a laser they describe the same spacing. DPI is dots per inch, LPI is lines per inch, and the line interval in millimeters is 25.4 divided by that number.
Does a higher DPI always look better?
Only up to the spot size of the beam. Past that you are burning the same line twice and the photo gets darker, not sharper.
What is the calibration square for?
It is a 100 mm square in a true-size SVG. Import it at 100% and measure it. That tells you whether the software is honoring millimeters.