Set a photo to 200 or 300 DPI — without touching the pixels
UPPSC asks for 200 DPI, print shops ask for 300, and scanner software writes whatever it likes. DPI is only a note inside the file that says how large the image should print — it does not change the picture. Snapfix writes that note and leaves every pixel exactly as it was, so the file size barely changes and nothing is blurred.
Made for
- Photos and signatures for forms that state 200 DPI
- Scans that report 72 DPI and get refused by a print shop
- Documents for printing at exact centimetre sizes
- Files prepared with ExamPic, if a portal wants a different DPI
How it works
- DPI is metadata: 413 × 531 pixels stays 413 × 531 pixels at any DPI.
- Snapfix writes the JFIF density tag (JPEG) or the pHYs chunk (PNG) — no re-encoding, so there is no quality loss.
- Pixels ÷ DPI = printed inches: 413 px at 200 DPI prints about 5.2 cm wide.
- Most portals check pixels and KB, not DPI — set it when the notification names a number.
- To change the actual pixel size, resize instead: this tool never resamples.
Why this is the fix
Converters that "set DPI" usually re-encode the whole image, which loses quality and changes the file size — bad when the file was already tuned to a KB window. The density tag is a few bytes in the file header, so Snapfix edits those bytes in place. Your carefully sized 48 KB photo stays 48 KB, with the same pixels, and now reports the DPI your form asks for.
How to do it
- Select the JPEG or PNG. Snapfix shows the DPI it currently reports.
- Choose 200, 300 or type your own.
- Press Set DPI and download — the size and pixels are unchanged.
Questions
Does changing DPI improve quality?
No. It changes only the printing note. More detail needs a higher-resolution photo.
My file shows "no DPI tag".
Many images carry none, which software reads as 72. Setting 200 or 300 adds the tag.
Does the file size change?
By a few bytes at most. The pixels are untouched.
Which DPI should I use?
Whatever your notification says — commonly 200 for Indian forms, 300 for printing.
Is my photo uploaded?
No. The header edit happens in your browser.