DPI guide
DPI calculator for passport and visa photos
Embassies specify physical size in millimetres and digital size in pixels. DPI (dots per inch) connects the two. Most passport specs assume 300 DPI; some visa portals (for example Australian ImmiAccount) expect higher-resolution exports.
Try it now
Interactive tool — runs in your browser. No upload leaves your device until you open Create or Verify.
Result
413 × 531 px
Formula: px = (mm ÷ 25.4) × 300. Print at 35×45 mm when exported at this resolution.
The formula
pixels = (millimetres ÷ 25.4) × DPI. For a 35×45 mm photo at 300 DPI: width = (35 ÷ 25.4) × 300 ≈ 413 px; height = (45 ÷ 25.4) × 300 ≈ 531 px.
300 DPI vs 600 DPI
- 300 DPI — standard for US, UK, Schengen, India passport catalog entries
- 600 DPI — used for some high-resolution visa uploads (for example au-visa at 827×1063 px)
- Upsampling a blurry photo to higher DPI does not add detail — start with a sharp capture
Practical workflow
Capture at the highest resolution your phone allows, then let PicsForm downsample to the exact pixel grid and KB ceiling for your document. Use /find to confirm targets before editing.
FAQ
- Is 300 DPI mandatory?
- Authorities care about resulting pixel dimensions and sharpness. 300 DPI is the conventional mapping from mm specs to pixels in most government guides.
Related tools
Passport photo size calculator
Look up passport and visa photo dimensions in millimetres, inches, and pixels at 300 DPI. Find the right spec by country and document.
Compress passport photo file size for online upload
Reduce JPEG file size to meet DS-160, UKVI, and other portal KB limits without breaking compliance dimensions.
Check if your passport photo meets official requirements
Upload a portrait and run PicsForm's passport photo checker. Scores head size, background, expression, and file limits against your document's published rules.
How PicsForm fits your workflow
PicsForm matches photos to published requirements. This is not legal or immigration advice and does not guarantee application approval. Always confirm current rules on the official portal.