Reference

Formats & Regional Standards

This reference page shows which paper sizes, units, DPI values and common photo/ID sizes IMGTool2PDF's tools support. Every number is derived from the real engine data — nothing here is invented.

imgtool2pdf.online — files stay on this device

Paper sizes

Every supported paper size with its metric and imperial measurements. The physical size never changes — only the label and unit style do.

Paper	Metric	Imperial
A3	297 × 420 mm	11.69 × 16.54 in
A4	210 × 297 mm	8.27 × 11.69 in
A5	148 × 210 mm	5.83 × 8.27 in
Letter	215.9 × 279.4 mm	8.5 × 11 in
Legal	215.9 × 355.6 mm	8.5 × 14 in

Units

Print and photo measurements are usually given in millimetres; US and Canada contexts often use inches. 1 inch = 25.4 mm. The conversions below are exact.

mm	in
1 mm	0.04 in
25.4 mm	1 in
35 mm	1.38 in
51 mm	2.01 in
148 mm	5.83 in
210 mm	8.27 in
215.9 mm	8.5 in
279.4 mm	11 in
297 mm	11.69 in
355.6 mm	14 in

DPI conventions

300 DPI is the common sharp print target. The DPI checker offers 150/200/300/400/600. Filling a full A4 page at 300 DPI needs about 2481 px on the long side — computed by the real engine.

150 DPI200 DPI300 DPI400 DPI600 DPIA4 · 300 DPI → 2481 px wide

Photo & ID sizes

The sizes the passport, visa and ID tools offer, with clear labels and the honest note that these are common, not official, sizes.

Important: these are commonly used sizes, not official specifications.

Important: these are commonly used sizes, not official specifications. Photo rules vary by issuing authority, country and year — always verify with the authority before applying.

Kind	Photo size	Common usage
Passport	35 × 45 mm	Common international passport size
Passport	51 × 51 mm (2.01 × 2.01 in)	e.g. US passport-style
Passport	33 × 48 mm	e.g. US visa photo
Passport	50 × 50 mm	Square passport-style photos
Visa	33 × 48 mm	e.g. US visa / common visa size
Visa	35 × 45 mm	Common international visa size
Visa	51 × 51 mm (2.01 × 2.01 in)	e.g. US passport-style
Visa	50 × 50 mm	Square visa photos
ID card	35 × 45 mm	Common ID card head-and-shoulders
ID card	25 × 35 mm	Smaller ID card photo
ID card	33 × 48 mm	Larger ID / permit photo
ID card	26 × 32 mm	e.g. China ID-style

Language

The site is English throughout — navigation, tools, workflows, guides and help pages all speak one language. Measurements are shown in both metric and imperial so regional requirements are easy to match.