Frequently Asked Questions

Straight answers about DPI, print quality, privacy, and how our tools work.

What is DPI in an image?
DPI stands for dots per inch. It's a small piece of metadata inside the file that tells a printer how many pixels to place in each inch of paper. It does not measure how much detail your photo contains.
Does increasing DPI improve image quality?
No. Raising the DPI value changes the intended print size, not the amount of visual detail. A blurry or low-resolution photo stays blurry and low-resolution at any DPI. Be skeptical of any tool that promises otherwise.
What DPI should I use for printing?
Most print shops, photo books, and stock agencies ask for 300 DPI. Large-format posters viewed from a distance often use 150 DPI. Always follow the specific requirements of your printer or submission form.
Are my images uploaded to your servers?
No. Every tool on this site runs entirely in your web browser using JavaScript. Your files are read locally on your device and never transmitted to any server.
Which image formats support DPI metadata?
JPEG stores DPI in its JFIF or EXIF headers, and PNG stores it in the pHYs chunk. WEBP and BMP have no standard DPI metadata field, so a DPI value cannot be saved in those formats.
Will changing DPI alter my photo's pixels?
Not with our tool. When you keep the same format, only the metadata header is rewritten — the pixel data is untouched. Pixels are only re-encoded if you convert to a different format or enable the enhance option.
Can I convert many images at once?
Yes. The DPI converter and format converter accept multiple files and let you download all results together as a ZIP archive.
Is this service free?
Yes. Every tool on this site is free to use — no accounts, no watermarks, no conversion limits.
Why does my file say "no DPI tag"?
Many apps — including screenshot tools and some phone cameras — simply don't write a DPI value. It means no print size was recorded; the pixels are fine. Use the DPI converter to stamp in whatever value you need.
Do you offer an API?
Not at this time. The tools are designed for interactive use in the browser.