Photo DPI Changer
Read this before using this tool: changing DPI only edits print-resolution metadata embedded in the file — it does not change the file's pixel dimensions and, in almost all cases, does not meaningfully change its file size in kilobytes. If a government exam portal is rejecting your photo for being outside a KB size range, changing DPI will usually not fix that. Use our photo resizer instead for a KB-limit problem.
This tool changes the DPI value stored in a JPEG's metadata — useful for print-resolution purposes, not for passing an online upload's size check.
JPEG only (this reads/writes a JPEG-specific metadata field).
Important: what this tool does and doesn't do
This only edits the DPI ("density") metadata field inside the JPEG file — it does NOT resize, crop, or re-compress your image, and it does NOT change the file's KB size in any meaningful way. Changing DPI has no effect on almost all government exam portal upload validators, which check pixel dimensions and file size in KB, not DPI. DPI only matters for physical print sizing (e.g. some desktop publishing/printing workflows) — use this tool only if you specifically need that. If your goal is to pass an online form's upload check, use our photo resizer instead. This also only patches the common JFIF-style density field — some camera-original JPEGs that store resolution only in EXIF metadata (not JFIF) aren't covered by this simple implementation.
What DPI actually means (and when it matters)
DPI (dots per inch) describes how many pixels would be printed per inch of paper at a given physical size — it's a print-resolution concept, not a measure of file size or image sharpness on screen. The same pixel dimensions can be labeled "72 DPI" or "300 DPI" depending only on what physical print size you intend, with no pixels added or removed either way. DPI genuinely matters when you're printing a physical photo — for example, getting a physical passport-size print made at a photo studio for an in-person biometric verification step — but it has essentially no effect on how an online form validates your upload, since online validators check pixel dimensions and file size in kilobytes, not embedded DPI metadata. See our full DPI guide for how to check an image's DPI and pixel dimensions without installing any software.
FAQ
Will changing DPI reduce my photo's file size? No, not meaningfully. File size in KB is controlled by pixel dimensions and compression quality, not by the DPI metadata tag.
My portal says "please upload a 300 DPI photo" — do I need this tool? Possibly, if the portal specifically validates the embedded DPI tag (uncommon but not unheard of) — most portals actually mean "high enough pixel resolution," not the metadata tag itself. Check the exact wording in your notification; if it's really about pixel dimensions, use our photo resizer instead.
Is my photo uploaded anywhere? No — this runs entirely in your browser; your file is never sent to a server.