300 DPI = 1 mm × (300 / 25.4) ≈ 11.81 px. Standard for photo labs and print services. Most authorities require photos taken within the last 6 months.
Calculate mm to pixels yourself
The output pixel size isn't picked by hand — it comes from one fixed formula. You can verify every number in the table above.
Step
Calculation
1 inch = 25.4 mm (fixed)
—
300 DPI = 300 px per inch
1 mm = 300 ÷ 25.4 ≈ 11.811 px
Width 35 mm
35 × 11.811 ≈ 413.4 → 413 px
Height 45 mm
45 × 11.811 ≈ 531.5 → 531 px
Result (passport size)
413 × 531 px
Decimals are rounded to the nearest whole pixel. That's why 30×40mm lands on 354×472px, 51×51mm (US visa) on 602×602px, and 33×48mm (China visa) on 390×567px. Enter any size under "Custom mm" and the same formula shows the pixels instantly, so you can check sizes that aren't in the table.
Note: whether you draw the crop frame large or small, the final output stays locked to your chosen preset's pixel size — the cropped area is redrawn (resampled) to fit the output, and a larger source crop gives a sharper result.
This tool standardizes size and resolution only. Official rules (head height 32–36mm, frontal view, ears visible, neutral expression, white background, taken within 6 months) are your responsibility. Check your government's official guidelines (e.g. US Department of State) or use an authorized photo studio. This tool is best for resumes, profiles, applications, and unofficial use.
Handles are too small to grab
The 4 corner handles are 14×14px but have +8px padding. On mobile, if precise resizing is hard, drag inside the rectangle to move only. A larger screen helps.
Are the guide lines accurate?
The guides (top of head 18%, eyes 42%, chin 78%) reflect typical ID-photo recommendations. Official rules vary by authority — for official submissions, always check the issuing authority's guidelines. The guides are good for resumes, profiles, and applications.
How does the white-background option work?
When checked, transparent pixels (alpha = 0) in the result PNG are filled with white. Since this tool only crops, it has no effect if the original has no transparency. To get a clean white background from a normal photo, run it through the Background Remover first, then bring the transparent PNG here.
Frequently Asked Questions
Are my photos uploaded to a server?
No. Cropping uses the canvas API in the browser only. Even the site operator cannot see your photos.
This tool only crops — for ID-document photos, sensitive material stays local.
Which standard sizes are supported?
US Passport (51×51 mm / 2×2 in) / Schengen Visa (35×45 mm) / UK Visa (35×45 mm) / China Visa (33×48 mm) / LinkedIn / profile (square) / Custom mm input.
All output at 300 DPI for print compatibility.
Why are pixel sizes auto-set?
Print standard is 300 DPI. Multiply mm by 300 / 25.4 ≈ 11.81 to get pixels.
Example: 35mm × 11.81 ≈ 413px, 45mm × 11.81 ≈ 531px → 35×45mm = 413×531 px @ 300dpi. This is the resolution photo labs and printers expect.
How do I align the face?
Inside the crop frame, dotted guide lines mark the top of head, eye level, and chin. Drag inside the frame to move; corner handles resize.
Common requirements: small space above the head, eyes at ~40% from the top, chin near the bottom.
How does the white-background option work?
This tool only crops. If your original background isn't white, the result won't be either. To produce a clean white background, first run the photo through the Background Remover, then bring the transparent PNG here. The white-background option fills only transparent pixels with white.
Can I print at a photo lab?
The output is at standard size and 300 DPI, so any photo lab or printer can print it.
Note that government ID issuance often requires photos taken at an authorized photo studio (US passport requires photos within 6 months, etc.). This tool is best for resumes, profiles, applications, and unofficial use.
For official IDs, follow the issuing authority's guidelines.
References
Last reviewed: 2026-05-09 / Common ID-photo standards + ISO 300 DPI print standard.
⚠️ For official ID and passport submissions, always confirm the issuing authority's exact rules (head position, expression, background, attire). This tool focuses on size and resolution standardization only.