How to Resize a Photo to 3.5 × 4.5 cm Online

A 3.5 × 4.5 cm photo is the same as 35 × 45 mm: a portrait image with a 7:9 shape. At 300 DPI that is about 413 × 531 pixels. To make one without distortion, crop your photo to 7:9 first, then resize it to the pixel size your form or print shop asks for, then compress only if there is a KB limit.

This size is common for Indian passport-style prints, many exam and government forms, and Schengen visa photos, so it's worth getting right once and keeping a copy.

Quick answer:

• 3.5 × 4.5 cm in pixels: 413 × 531 px at 300 DPI, 276 × 354 px at 200 DPI
• In millimetres: 35 × 45 mm
• In inches: about 1.38 × 1.77 in
• Shape: 7:9 portrait (taller than wide)
• Fastest way online: Passport Photo Maker for the crop and background, then Photo 50 KB to 100 KB with width 413 and height 531 for the file size

3.5 × 4.5 cm in Pixels at Common DPI Values

Centimetres measure a printed photo; pixels measure a digital one. To convert, you need a resolution, usually given as DPI or PPI:

Pixels = cm ÷ 2.54 × DPI

Values are rounded to whole pixels. For printing, 300 DPI (413 × 531 px) is the usual choice and gives a sharp result. For uploads, the form's own pixel requirement wins: if it says 3.5 × 4.5 cm and 200 × 230 px, make a 200 × 230 px file. If it only gives centimetres, 413 × 531 px is a safe default.

3.5 × 4.5 cm or 4.5 × 3.5 cm?

Many forms and searches write it the other way round: "4.5 cm × 3.5 cm" or "dimension should be 4.5 × 3.5". It is the same photo. Sizes are usually written width × height, but some notifications list the height first. A face photo is always the taller portrait shape, so the result is 3.5 cm wide and 4.5 cm tall either way, which is 413 px wide and 531 px tall at 300 DPI. If you type 531 × 413 into a resizer, you get a landscape image and a squashed face.

Which DPI should you choose?

• Printing at a shop or at home: 300 DPI (413 × 531 px). Use 600 DPI (827 × 1063 px) only if the shop asks for it.
• Uploading to a form that gives only centimetres: 300 DPI is safe. Most portals display the photo small, so 413 × 531 px is more than enough.
• Uploading with a small KB limit (10–50 KB): 200 DPI (276 × 354 px) keeps the 7:9 shape in fewer pixels, which leaves more of the file size for quality.
• The form gives pixels: ignore DPI and use its numbers exactly.

If you're unsure how DPI and pixels relate, our explainer on image resolution, DPI and PPI covers it in more depth.

Why the 7:9 Shape Matters

3.5 ÷ 4.5 simplifies to 7 ÷ 9. Any pixel size with that proportion prints at exactly 3.5 × 4.5 cm when the DPI is set correctly: 350 × 450, 413 × 531, 700 × 900 and so on.

Phone photos are usually 3:4 (slightly wider than 7:9) or 9:16 (much taller). If you type 413 × 531 into a resizer without cropping first, the resizer has to squeeze the image to fit, and the face comes out narrower or wider than in real life. Forms that use face matching may reject that, and it simply looks wrong.

To find the right crop for any image height: width = height × 7 ÷ 9. A 3,000 px tall crop should be about 2,333 px wide.

Step-by-Step: Resize a Photo to 3.5 × 4.5 cm

Step 1: Take or Choose a Suitable Photo

Use an original photo from your camera, not a WhatsApp-forwarded copy. Stand in front of a plain light wall, face a window for even light, and have someone else take the photo at eye level. Leave space above your head and include the top of your shoulders, so you have room to crop.

Step 2: Crop to 7:9

The quickest way is the Passport Photo Maker: pick the India or Schengen preset (both 35 × 45 mm), drag the frame so your head is centred, and set a white or light background if your form requires one.

If you'd rather crop manually, use the crop tool in free mode and draw a box that follows the width = height × 7 ÷ 9 rule. It doesn't have to be perfect to the pixel; the next step fixes the final numbers.

Step 3: Resize to Exact Pixels

Open the cropped image in the image resizer and enter the pixel size you need, such as 413 × 531 for a 300 DPI print or the exact numbers in your form's notification. Because your crop is already close to 7:9, setting exact values won't visibly distort anything.

Step 4: Save as JPG

Use JPG for photos unless the form asks for another format. PNG files are much larger for photographs, and WebP or HEIC are often rejected by government portals.

Step 5: Compress to the KB Limit

If the form sets a maximum file size, compress after resizing, not before. Use compress image to 50 KB or compress image to size with your exact limit. If the form gives a range such as "between 50 KB and 100 KB", use Photo 50 KB to 100 KB instead: type 413 and 531 in the width and height boxes and it handles the pixel size and the KB range in one step, including raising a photo that is too small. A 413 × 531 px portrait often fits under 100 KB at a good quality setting, depending on detail in the image; getting under 20 KB may need a smaller pixel size, but only if the form allows it.

Step 6: Check the Result

Open the final file and check the dimensions, file size and format in your file properties. Zoom in on the eyes and hair edges. If they look blocky, go back to the resized file and compress less.

Positioning Your Face in the Frame

Size alone doesn't make an acceptable photo. Most authorities that use 35 × 45 mm want:

• The face looking straight at the camera, centred left to right.
• A small gap above the head; the head should not touch the top edge.
• The face filling a large part of the frame. Schengen guidance, for example, commonly asks for the face to cover roughly 70–80% of the photo height.
• A plain background with no shadows behind the head.

If your head looks too small after cropping, crop tighter from the original. If it looks too large, crop wider. Don't fix framing by resizing; that only changes the overall image size, not how much of it your head fills.

Printing 3.5 × 4.5 cm Photos

For prints, make a 413 × 531 px (300 DPI) or 827 × 1063 px (600 DPI) JPG and tell the print shop the physical size. Many shops print several copies on one 4 × 6 inch sheet. If you print at home, set the printer to "actual size" or 100% scaling; "fit to page" will enlarge the photo and ruin the dimensions. Measure one print with a ruler before cutting the rest.

Making a 3.5 × 4.5 cm Photo on Your Phone

You don't need a computer. Everything above works in Chrome or Safari on a phone:

1. Ask someone to take the photo in daylight, with you facing a window and standing about a metre in front of a plain light wall. Avoid the front camera's wide-angle distortion by having them stand back a little and zoom in slightly rather than holding the phone close.
2. Open the Passport Photo Maker in your phone browser, upload the photo from your gallery, choose the 35 × 45 mm preset and position your head inside the guide.
3. Download the result, then open Photo 50 KB to 100 KB (or the single-limit page your form needs) and upload the downloaded file.
4. When the form asks for the photo, choose it from Downloads or the Files app. The gallery sometimes shows the original photo instead of the edited copy.

On an iPhone, photos are saved as HEIC by default. If a site will not open one, convert it with the HEIC to JPG converter first, or switch the camera to Most Compatible under Settings › Camera › Formats.

When the Form Rejects the Photo

• "Invalid dimensions": the file's pixels do not match. Check the exact numbers in the notification; they may differ from 413 × 531 even when the form also mentions 3.5 × 4.5 cm.
• "File size too large" or "too small": the size is outside the KB range. A range tool fixes both directions without changing the shape.
• "Invalid format": the file is PNG, HEIC or WebP renamed to .jpg. Save or convert it as a real JPG.
• Rejected at verification later: the photo itself breaks a rule, for example an old photo, dark glasses, a cap, a busy background or a face that is too small in the frame. Fix the photo, not the file.

Common Mistakes

Confusing centimetres and pixels. "3.5 × 4.5" in a pixel box gives you a 4-pixel image. Always convert first.

Resizing only the width. If you set the width to 3.5 cm and let the editor calculate height, you'll get the height of your original shape, not 4.5 cm. Crop to 7:9 first.

Over-compressing. If a form allows up to 100 KB, a 90 KB file is better than a 20 KB one.

Editing the same file repeatedly. Each JPEG save loses a little detail. Keep the original and start from it each time you need a new version.

Assuming 3.5 × 4.5 cm fits every document. US passports and visas use a 2 × 2 inch square, and Canada uses 50 × 70 mm. Our passport photo size guide lists sizes by country.

Frequently Asked Questions

What is 3.5 × 4.5 cm in pixels?

It depends on resolution. At 300 DPI it is about 413 × 531 pixels, at 200 DPI about 276 × 354 pixels, and at 600 DPI about 827 × 1063 pixels. If your form lists its own pixel size, use that.

Is 3.5 × 4.5 cm the same as 35 × 45 mm?

Yes. 3.5 cm is 35 mm and 4.5 cm is 45 mm, so both describe the same portrait photo with a 7:9 shape.

What aspect ratio should I crop to?

7:9. For example 350 × 450, 413 × 531 or 700 × 900 pixels. Cropping to this shape before resizing stops the face from being stretched.

How do I get a 3.5 × 4.5 cm photo under 50 KB or 100 KB?

Crop to 7:9, resize to the required pixels, save as JPG, then use a compress-to-size tool with your KB limit. Don't shrink the pixels below the form's minimum just to save space.

Is 4.5 × 3.5 cm the same as 3.5 × 4.5 cm?

For a passport-style photo, yes. Sizes are normally written width × height, so 3.5 × 4.5 cm is 3.5 cm wide and 4.5 cm tall. Some forms write the height first, but a face photo is always the taller portrait shape, never 4.5 cm wide.

What is 3.5 × 4.5 cm in inches?

About 1.38 × 1.77 inches. That is smaller than the 2 × 2 inch photo used for US passports and visas, so the two sizes are not interchangeable.

The form only says 3.5 × 4.5 cm. What pixel size should I upload?

If no pixels are given, 413 × 531 pixels (300 DPI) is a safe choice. If the form also sets a small KB limit such as 20 KB to 50 KB, 276 × 354 pixels (200 DPI) keeps the same shape in a smaller file.

Related Guides

If your form also asks for a signature or has specific KB ranges, see our guide on photo and signature sizes for online forms. For general tips on cropping cleanly, read how to crop a photo to any size without losing quality.