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Free DPI converter online
Image DPI checker & converter
Check image DPI online and convert PNG or JPG to 300, 600 or 1200 DPI. Preview print size and download without resampling or uploading your image.
Your images stay in your browser. No account, upload or watermark.
or drop it here
PNG or JPEG · up to 25 MB
See exactly how your image will print
Choose a file or try the example to inspect its DPI and compare print sizes.
Original pixels
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Stored density
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Print size at target DPI
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Same pixels. New print size.
This changes density metadata only. It does not upscale, sharpen or resize your image.
How to use this tool
- 01
Choose a PNG or JPG
Drop an image to read its actual stored resolution and pixel dimensions. Missing DPI is shown explicitly.
- 02
Set the print density
Choose a preset or enter a whole number from 1 to 2400 DPI. Compare the resulting size in inches or centimeters.
- 03
Download the updated image
The converter updates density metadata and verifies it before download. The original file and compressed image pixels are preserved.
Changing DPI does not add image detail
A DPI value describes how densely an image should be placed on a printed page. Image pixels per inch are technically PPI, while DPI describes printer dots. Image editors often label this resolution setting as DPI, so this tool uses that familiar term.
A 3000 × 2400 pixel image measures 10 × 8 inches at 300 DPI, or 5 × 4 inches at 600 DPI. The pixel count stays exactly the same. Changing a 72 DPI tag to 300 DPI does not sharpen a small picture or upscale it. Print quality also depends on the source pixels, viewing distance, paper and printer.
Read the file, then change its density
PNG files store physical density in a pHYs chunk. JPEG files may store it in JFIF, EXIF, or both. This checker reads horizontal and vertical density, identifies conflicting values, and shows when no usable density is stored. It does not silently assume 72 or 96 DPI.
Conversion writes matching horizontal and vertical density to PNG pHYs or JPEG JFIF and updates existing EXIF resolution, including PNG EXIF. It preserves compressed pixels, color profiles and orientation. PNG uses whole pixels per meter, so its displayed DPI can differ slightly through rounding. PNG and JPEG are supported up to 25 MB. TIFF, PSD, HEIC and other formats must first be exported as PNG or JPEG.
Calculate the pixels your print needs
Print width in inches = pixel width ÷ DPI. Multiply inches by 2.54 for centimeters. To plan a print, reverse the calculation: required pixels = print size in inches × target DPI.
For a 4 × 6 inch print at 300 DPI, use at least 1200 × 1800 pixels. The same print at 1200 DPI needs 4800 × 7200 pixels. Ask your print provider for the density they need; selecting a larger number alone does not improve the source image. Some print applications override embedded density when you choose a page size or fit-to-page option.
Frequently asked questions
How can I convert the DPI of an image?
Open a PNG or JPEG in this tool, choose the target DPI, and download the updated image. The converter rewrites resolution metadata without resampling, so pixel dimensions and image detail stay the same.
How can I convert a 72 DPI image to 300 DPI?
Choose your image, select the 300 DPI preset, and download it. A 3000 pixel wide image changes from about 41.67 inches at 72 DPI to 10 inches at 300 DPI. It still contains 3000 pixels across.
What is the best DPI converter?
For a metadata-only change, choose a converter that reads actual file density, shows print dimensions, preserves image pixels, and explains missing metadata. This tool provides those checks locally for PNG and JPEG. Use a photo editor if you also need resampling, retouching, or a TIFF workflow.
How to convert an image to 1200 DPI?
Select the 1200 DPI preset and download. This writes the new print density without creating extra pixels. For a 4 × 6 inch print at 1200 DPI, the source needs 4800 × 7200 pixels; changing metadata cannot supply missing detail.
Why does my image have no DPI?
Some exports omit physical resolution or store only a pixel aspect ratio. The image still has a width and height in pixels. You can add a DPI value here, but a missing density tag does not mean the image has poor quality.
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