Change image DPI online — free DPI and PPI converter
Re-tag your image's DPI without resampling, or compute pixels at a new DPI. Both directions, exact math.
No sign-up · calculated right in your browser
Pixels and DPI — how big the photo prints
Change image DPI online: edit only the DPI metadata or resample to a new resolution. Many portals ask for 300 DPI. Free, everything runs in your browser.
- 01
Upload your image. Current DPI is read from the file metadata.
- 02
Pick mode A (re-tag only, no resample) or mode B (resample, change pixel count).
- 03
Set target DPI (300 is the standard) and download.
Write DPI into a file
Upload a JPEG or PNG and download a copy with the chosen DPI written into its print metadata (JFIF density / pHYs). Pixels are not changed — only the density tag printers read.
Calculating is free. A document photo — by the AI
Free, right here
- 01Instant, no photo upload
- 02Calculated right in your browser
- 03No ads
- 04As many times as you like
No sign-up, no card.
AI correction
When adjusting the file is not enough: fixes light, shadows, clothing and pose and makes the photo to the document’s rules. You see the result before paying.
If it’s rejected, we refund you
Make a document photoFrequently asked questions about document photos
Does changing DPI affect image quality?
Mode A (re-tag only) — no, pixels are untouched, only the metadata changes. Mode B (resample) — yes, going up invents pixels (slight blur), going down throws pixels away (irreversible). For passport workflows, mode A is almost always what you want.
Why does my JPG show 72 DPI in Preview?
72 DPI is the historical web default — many editors and screenshots emit it. The pixels in your file are exactly the same regardless of the DPI tag; only the implied print size changes. Use mode A to re-tag to 300 DPI without re-encoding the image.
Will the file size change?
Mode A: only a few bytes (the DPI tag itself). Mode B: yes, proportional to the new pixel count — upsampling makes it bigger, downsampling smaller.