Check the DPI/resolution of a photo.
Before uploading a photo to a form that specifies a minimum DPI, it's worth checking what DPI your file is actually tagged at - this tool reads that metadata without changing anything.
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Try Free Resume Builder Try Free Invoice BuilderA form that says "minimum 300 DPI" is checking the metadata tag, not visually judging the image - if your camera or scanner saved the file at a lower tagged DPI (common with phone photos, which are often untagged or tagged at 72), you'll want to know before the upload gets rejected, not after.
DPI is a metadata tag, separate from visual sharpness - a sharp phone photo can still carry a low or missing DPI tag.
Use the DPI Converter tool to set the tag to what your form requires, without resizing the image itself.