Resize Image to 3.81×3.81 cm
3.81 × 3.81 cm is exactly 1.5 × 1.5 inches. At 300 DPI that is a 450-pixel square, and the DPI is saved so it prints at the right size. Everything runs in your browser — nothing is uploaded. Need a smaller file instead? Compress or convert.
Drag the preview to choose which part of the image is kept. The same framing is used for every image in the batch.
Why choose 3.81×3.81 cm?
3.81×3.81 cm (38.1×38.1 mm, 1.5×1.5 in) is a square print size used for ID cards, passport-style photos and application forms. At 300 DPI it needs 450×450 pixels.
450×450 px at 300 DPI
The pixel size is worked out for you, and the file is saved with 300 DPI so it prints at exactly 3.81×3.81 cm.
Where it is used
3.81×3.81 cm is a common size for ID cards, passport-style photos and application forms. Check the requirements of the form or printer you are sending it to.
28 per A4 sheet
With small gaps, 28 photos fit on one A4 page and 30 on US Letter — handy for printing several copies at home.
1:1 square shape
The square (1:1) proportion decides the framing. Drag the preview so the subject sits where the rules expect it.
About 32 KB–63 KB as JPG
At 300 DPI a 3.81×3.81 cm photo is usually 32 KB–63 KB. If a form limits the file size, pair it with the compressor.
Same size, other units
3.81×3.81 cm equals 38.1×38.1 mm or 1.5×1.5 in. Enter whichever unit your instructions use — the result is identical.
3.81×3.81 cm at a glance
| Size | 3.81×3.81 cm = 38.1×38.1 mm, 1.5×1.5 in |
|---|---|
| Pixels at 300 DPI (print) | 450×450 |
| Pixels at 600 DPI (high quality) | 900×900 |
| Pixels at 200 DPI | 300×300 |
| Pixels at 150 DPI | 225×225 |
| Aspect ratio | square (1:1) |
| Copies per A4 sheet | 28 |
| Copies per US Letter sheet | 30 |
| Copies per 4×6 in photo paper | 6 |
| Typical JPG at 300 DPI | 32 KB–63 KB |
| Same and similar sizes | 38.1×38.1 mm, 1.5×1.5 in, 4×4 cm, 36×36 mm |
Resize a photo to 3.81×3.81 cm in 3 steps
- Add your photo — a clear, well-lit original works best.
- The size is already set to 3.81×3.81 cm at 300 DPI. Drag and zoom the preview to frame the face or subject.
- Click Resize and download. Print it at 100% (“actual size”) so it comes out at 3.81×3.81 cm.
New to image resizing? Read the full resizing guide.
Square sizes
Same width and height — profile photos, icons, product shots:
Landscape sizes
Wider than tall — screens, banners, covers and thumbnails:
Portrait sizes
Taller than wide — passport photos, forms and phone screens:
Change the aspect ratio
Paper, print & photo sizes
Paper and photo sizes in mm, cm and inches, plus DPI tools:
Resize for a platform
Ready-made sizes for social profiles and posts:
Resize tools
Batch resizing, DPI and crop tools:
A 1.5-inch square measured in centimetres
Exact conversion. One inch is 2.54 cm, so 1.5 inches is 3.81 cm — no rounding. That is why forms that started in inches list this odd metric number.
Pixels: 450 × 450 at 300 DPI — the same as the 450×450 pixel page, plus the print size stored in the file.
Uses. Button badges, round stickers (cut from the square), membership cards and square photo boxes on forms.
Same size in other units: 1.5×1.5 inch, 38.1×38.1 mm. Nearby: 3.5 cm, 4 cm.
Similar print and photo sizes
Nearby print sizes, saved at 300 DPI so they print at the right size:
Frequently asked questions
Why 3.81 cm and not 3.8 cm?
Because it is exactly 1.5 inches (1.5 × 2.54 = 3.81). The size comes from an inch-based standard.
How many photos of 3.81×3.81 cm fit on an A4 page?
About 28 on A4 and 30 on US Letter, leaving 5 mm margins and 3 mm between photos. On 4×6 inch photo paper you can fit 6.
What DPI should a 3.81×3.81 cm photo be?
300 DPI is the standard for photo prints and gives 450×450 pixels. Some offices accept 200 DPI (300×300); 600 DPI (900×900) is only needed for very high-quality printing.
What is 3.81×3.81 cm in other units?
3.81×3.81 cm is 38.1×38.1 mm, 1.5×1.5 in. Close sizes that are often confused with it: 38.1×38.1 mm, 1.5×1.5 in.
Why does my 3.81×3.81 cm print come out the wrong size?
Most printers scale images to “fit page” by default. Choose “actual size” or 100% in the print dialog, and the photo will print at exactly 3.81×3.81 cm.
How large is a 3.81×3.81 cm photo file?
Usually 32 KB–63 KB as a JPG at 300 DPI. If an online form allows less, reduce it with the compressor — the print size stays the same.
Are my images uploaded?
No. Resizing happens entirely in your browser. Nothing is transmitted or stored, and you can disconnect from the internet after the page loads and it still works.