Free tools
Tattoo stencil print resolution checker
Direct answer
To print a tattoo stencil you want roughly 300 DPI at final size, and 200 DPI is the practical floor for bold linework. Effective DPI is the image's pixel width divided by the printed width in inches: a 1240 px image printed 8 inches wide is 155 DPI, and its lines will break up on transfer. This checker measures your image and tells you the pixel width the size you chose actually needs.
Drop an image here, or choose a file
Nothing is uploaded. The image is measured in your browser.
Intended print size
Choose an image to see its effective DPI at the size you plan to print.
DPI
Effective DPI at this print width
Where this lands between 0 and 400 DPI
How this works, and what it will not do
Resolution is the single most common reason a stencil fails, and it fails silently: the image looks fine on a phone screen at 3 inches wide and falls apart printed at 8. Screen pixels and paper pixels are not the same currency.
The verdict below is deliberately blunt. It gives you the effective DPI, the pixel width you would need at the size you entered, and whether that gap is recoverable. Upscaling interpolates between pixels that exist — it cannot invent detail that was never captured, which is why a photo below roughly 1000 px on its long edge means redrawing rather than converting.
Your image is read by your own browser to measure its dimensions. It is never uploaded.
Frequently asked questions
What DPI should a tattoo stencil be printed at?
300 DPI at final print size is the target. 200 DPI still transfers acceptably for bold, simple linework. Below about 150 DPI, thin lines break into dashes on the transfer.
How do I calculate DPI for printing?
Divide the image width in pixels by the printed width in inches. A 2400 px image printed 8 inches wide is 300 DPI. For centimetres, divide the pixel width by (cm ÷ 2.54).
Can upscaling fix a low resolution photo?
Partly. Upscaling interpolates between existing pixels and can smooth the jagged edges that would otherwise print as stair-steps, but it cannot reconstruct detail the camera never captured. Below roughly 1000 px on the long edge you are redrawing the design, not converting it.
Is my image uploaded to a server?
No. The checker reads the image dimensions in your browser and nothing leaves the page.