Image DPI Converter
Change JPG or PNG print density without changing pixels, or resample pixels while preserving physical print size. Everything runs locally in your browser.
- Runs in your browser
- No image upload
- Review before download
Upload JPG or PNG
Select one JPG, JPEG, or PNG image. Animated PNG is not supported.
Your image bytes remain in this browser and are not uploaded to PicRecast or an external image service.
How to change image DPI or PPI
Upload a JPG or PNG, inspect its density, choose metadata-only or resampling, select a target PPI, review print size, then download the result.
Change density without changing pixels
Metadata-only updates the JPEG JFIF and parseable EXIF resolution tags or the PNG pHYs chunk. JPEG compressed scan data and PNG IDAT data remain unchanged; dimensions and decoded pixels are preserved.
Resample for a physical print size
Resampling uses new pixels = original pixels × target PPI ÷ source PPI, rounded to whole pixels. It keeps the approximate physical size, re-encodes the image, and requires explicit permission to upscale.
Pixels versus print size
Print size in inches = pixel dimension ÷ PPI. For example, a 3000 px-wide image at 300 PPI is 10 inches wide. A 2000 px height at 300 PPI is about 6.67 inches.
Image DPI Converter FAQ
Are DPI and PPI the same?
PPI measures image pixels per printed inch; DPI usually describes printer dots. Image density metadata is often called DPI even when it represents PPI.
Does changing DPI increase image quality?
Changing metadata only does not change pixels or add detail. Resampling creates pixels by interpolation, but cannot recover detail absent from the source.
What if my image has no DPI metadata?
You can set metadata-only density directly. To resample while preserving print size, enter a source PPI you know; this tool does not assume 72 PPI.
More questions
Will the print size change?
With metadata-only changes, the same pixel dimensions at a different PPI imply a different print size. Resampling adjusts pixel dimensions to keep approximate physical print size.
Will the image be re-encoded?
Metadata-only retains JPEG scan or PNG IDAT bytes. Resample mode re-encodes pixels. JPEG uses quality 90 by default; browser canvas output may omit source metadata.
Is my image uploaded?
No. Image bytes are processed locally in your browser.