Last reviewed on 14 August 2026 by the Resizo editorial team, against the primary sources listed at the end
of this section.
DPI vs pixel dimensions — what
portals actually check
Passport authorities specify photo sizes in millimetres (35 × 45 mm, 50 × 70 mm) or inches
(2 × 2 in), not pixels. The conversion depends on DPI: a 35 × 45 mm photo at 300 DPI is
413 × 531 pixels; the same photo at 200 DPI is 276 × 354 pixels. 300 DPI is the figure the
authorities publish for printed photos, and it is what Resizo exports.
For an online upload, though, the DPI value stored in the file is not what gets validated. The portal
reads the pixel dimensions and the file size in bytes. A 600 × 600 px JPEG passes the DS-160 check
whether its metadata says 300 DPI or 72 DPI. DPI matters when the photo will be printed at a specific
physical size — which is why the two things are worth keeping separate in your head.
Acceptance rules: what reviewers check
Beyond dimensions, the published rules are consistent across the major authorities: the head must sit
inside a specified height band, the eyes must be level and centred horizontally, the background must be
plain and light with no shadows or patterns, the expression must be neutral with both eyes open and the
mouth closed, and the photo must be recent — taken within the last six months. The US and the UK
both require glasses to be removed. Head coverings are permitted only for religious or medical reasons,
and must not obscure the face.
Two limits are worth being blunt about. Resizo's background option fills in behind your photo; it does
not remove shadows or replace a background that is already in the image. And no resizing tool can fix a
photo taken in poor light. Both are properties of the original shot, so the fastest route to an accepted
photo is usually to retake it against a blank wall facing a window, then crop it here.
File size and submission platform limits
Online portals cap the file size, and the caps are much tighter than the "a few megabytes" people
assume. The US DS-160 visa portal accepts a maximum of 240 KB. India's OCI portal allows 200 KB, and
China's COVA portal 40–120 KB. UK Visas and Immigration is the outlier at 10 MB — though
it has a floor of 50 KB, so an over-compressed file fails there too. A 300 DPI 35 × 45 mm photo
exported at JPEG quality 95 typically lands around 80–150 KB, so it clears most caps — but
a phone photo cropped to 1200 × 1200 px will not.
See the
per-portal caps above ·
Compress to an exact
figure
On pixel dimensions, portals differ in whether they want an exact size or a range. The US Department of
State accepts any square image from 600 × 600 to 1200 × 1200 px, not only 600 × 600.
Resizo's US preset outputs 600 × 600 at 300 DPI, the smallest accepted size, which is also exactly
2 × 2 inches when printed. India's OCI portal takes the same shape of rule — any square
image from 200 × 200 to 900 × 900 px. Others publish a single fixed size: Singapore's ICA
asks for exactly 400 × 514 px. Always confirm the requirement on the official page for your
application before uploading.
Primary sources
Every figure on this page is taken from the issuing authority rather than from a
third-party summary. Requirements change, so treat these as the authority and this page as a
convenience:
- Passport photos — U.S. Department of
State (2 × 2 in, head height, no digital alteration)
- Digital image requirements — U.S.
visas (600 × 600 to 1200 × 1200 px, 240 KB)
- Photos for passports — GOV.UK
(35 × 45 mm, 29–34 mm head height)
- OCI application FAQ — Bureau of
Immigration, India (200 × 200 to 900 × 900 px square, 200 KB, photo and signature)
- Photo upload FAQ — Chinese Visa
Application Service Center (354 × 472 px, 40–120 KB, JPEG)
- Passport Seva — Government of
India (35 × 45 mm; its upload cap is not published in a form we can cite — see
§ above)
- Photo requirements — IRCC,
Canada (50 × 70 mm printed, 420 × 540 px digital minimum)
- ICAO Doc 9303, Machine Readable Travel Documents — the biometric portrait standard the
35 × 45 mm formats derive from