Free DPI and PPI converter for image resolution
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.
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How it works
- 1Upload your image. Current DPI is read from the file metadata.
- 2Pick mode A (re-tag only, no resample) or mode B (resample, change pixel count).
- 3Set target DPI (300 is the standard) and download.
Frequently asked
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.
Skip the DPI math entirely
Anfas.Pro outputs a file already sized correctly for both digital upload and print — no DPI conversion needed.