ID Photo Resizer
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Change a Photo’s DPI to 300

300 DPI is written into the file by default; change it under More settings if your form needs another value. The checks read the DPI back from the final file.

1Photo requirements

Works as is: 2×2 inch (600×600 px), white background, JPG. If the form states its own rules, paste them below and they fill in automatically.

Show an example
Size
Background
More settings (usually not needed)
Use this when the form gives inches, cm or mm; it converts to pixels at the DPI above.
Output format
Other backgrounds
The max is counted as 1000 bytes per KB and the min as 1024, so the file passes either way a site counts KB.
Send it to others and they get the same settings (the photo is never included)

2Choose a photo and position it

Drop a photo here, or

No ID photo needed: a phone selfie or any ordinary photo works. It centers on your face, crops to the required size and changes the background.

When taking it: stand in front of a plain light wall with even light and no shadows; hold the phone at eye level about an arm’s length away and include your shoulders; face the camera with ears and eyebrows visible, no hat. JPG, PNG, WebP or iPhone HEIC.

3Create and check

DPI vs pixels

DPI is only a note in the file saying how many dots per inch to print at. Changing it does not change the pixels or make the photo sharper. Most upload checks care about pixels and KB; DPI matters when the form explicitly asks for it.

FAQ

How many pixels is 300 DPI?

It depends on the print size: 2×2 inches at 300 DPI is 600×600 pixels; 35×45 mm is 413×531 pixels.

How can I see a photo’s DPI?

On Windows: right-click the file → Properties → Details → Horizontal/Vertical resolution. The checks here also show it.