01
Image DPI and print-size formula
Divide pixel width and height by DPI to estimate physical print inches.
Image ToolsFREE · NO SIGNUP
Image DPI Converter
Inspect an image locally, choose metadata-only or resample mode, and see the pixel and print-size consequences before download.
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01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Choose what changing DPI means.
Your file, filename, dimensions, and settings never enter analytics or leave this browser.
CONVERSION PREVIEWPIXELS PRESERVED
Output dimensions
WAITING FOR IMAGE
Changing density metadata does not create new image detail.Choose a file to reveal source and output dimensions.
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DENSITY IS NOT DETAIL
Separate a metadata change from a pixel change.
DPI connects pixel dimensions to a declared physical print size. Changing only the number does not invent detail; resampling deliberately changes the pixel grid.
WORKING VIEW
10 × 8 INCHES3000 × 2400 AT 300 DPI
METHODprint inches = pixels ÷ DPI
WORKING NOTEAt 150 DPI, preserving that print size resamples to 1500 × 1200 pixels
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
3000 × 2400 AT 300 DPI10 × 8 INCHES
At 150 DPI, preserving that print size resamples to 1500 × 1200 pixels
02
Metadata-only versus resampling
Metadata-only mode keeps every pixel and changes the PNG density declaration.
03
Private browser-local conversion
The image is decoded, rendered, and downloaded in your browser.
04
Quality and format limits
Metadata-only conversion creates no new detail. Downsampling discards pixels, while upsampling interpolates rather than recovering missing detail.
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Image DPI and print-size formula
Divide pixel width and height by DPI to estimate physical print inches.
Multiply the chosen print inches by a new DPI when resampling to a different pixel grid.
Metadata-only versus resampling
Metadata-only mode keeps every pixel and changes the PNG density declaration.
Resample mode redraws the image to new pixel dimensions while preserving the print size implied by the source DPI.
Private browser-local conversion
The image is decoded, rendered, and downloaded in your browser.
File bytes, names, dimensions, and entered values are excluded from analytics.
Quality and format limits
Metadata-only conversion creates no new detail. Downsampling discards pixels, while upsampling interpolates rather than recovering missing detail.
Output is PNG and does not preserve source JPEG or WebP metadata.
Questions, answered.
Does changing DPI increase image quality?
No. A metadata-only change preserves the exact pixels, and upsampling cannot recover detail that was never captured.
When should I resample pixels?
Resample when you need a specific print size and target DPI to correspond to a different pixel grid.
Is my image uploaded?
No. Decoding, canvas rendering, density metadata writing, and download all happen locally in the browser.
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