Does this make my image higher resolution?

No — DPI is only a print-density label. It tells the printer how large to print the existing pixels; it doesn't add detail.

My print shop rejected my file for low DPI — will this fix it?

Yes, it sets the tag to 300 DPI. For large prints, also make sure the image has enough pixels for the physical size you want.

Does the file size change?

For JPG, PNG and TIFF, only by a few bytes in the header. The image data is copied as it is, with no re-encoding, so the file is the same size and the same quality, just labelled 300 DPI. A WebP or HEIC is saved once as a high-quality JPG or PNG, so its size changes.

Why does my image say 72 DPI when I never set anything?

Cameras, phones and screenshot tools write 72 or 96 by default because the value only matters for printing. It says nothing about sharpness; a 6000-pixel photo tagged 72 DPI is still a 6000-pixel photo.

300 DPI Converter — Convert an Image to 300 DPI Free

Set an image to 300 DPI for printing — pixels untouched, only the print tag changes.

Target DPI

DPI

Drop an image here or click to choose

JPG, PNG, TIFF: quality untouched · WebP, HEIC, AVIF, GIF: saved as JPG/PNG · never uploaded

Print shops, book printers, academic journals and poster services all put the same line in their upload rules: images must be 300 DPI. Files from phones, screenshots and web downloads usually carry a tag of 72 or 96, so the upload is rejected before anyone looks at the picture. This page sets that tag to 300 and leaves the image data untouched, with no re-compression and no resizing. The pixels you had are the pixels you get.

That is the right fix when the rejection is a checkbox and the image already has enough pixels. It is not a fix for an image that is genuinely too small to print. A 1800 by 1200 pixel photo tagged at 300 DPI prints at 6 by 4 inches; ask the printer for 18 by 12 and it will look soft no matter what the header says. Pixel width divided by 300 gives the widest sharp print in inches, and if that is too small, use the Image Upscaler to add pixels before coming back here for the tag.

Common jobs this page handles: a KDP or print-on-demand cover that failed a DPI check, a figure for a journal submission, a logo for business cards, a photo for a canvas print. The change is written on your device and the file is never uploaded.

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Frequently asked questions

Does this make my image higher resolution?: No — DPI is only a print-density label. It tells the printer how large to print the existing pixels; it doesn't add detail.
My print shop rejected my file for low DPI — will this fix it?: Yes, it sets the tag to 300 DPI. For large prints, also make sure the image has enough pixels for the physical size you want.
Does the file size change?: For JPG, PNG and TIFF, only by a few bytes in the header. The image data is copied as it is, with no re-encoding, so the file is the same size and the same quality, just labelled 300 DPI. A WebP or HEIC is saved once as a high-quality JPG or PNG, so its size changes.
Why does my image say 72 DPI when I never set anything?: Cameras, phones and screenshot tools write 72 or 96 by default because the value only matters for printing. It says nothing about sharpness; a 6000-pixel photo tagged 72 DPI is still a 6000-pixel photo.

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