Resize Image to 38.1×38.1 mm
38.1 mm is exactly 1.5 inches, so 38.1 × 38.1 mm is a 1.5-inch square. At 300 DPI it is 450 × 450 pixels — a size used for badges, buttons and some ID photos. 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 38.1×38.1 mm?
38.1×38.1 mm — that is 3.81×3.81 cm, 1.5×1.5 in — is the size asked for ID cards, passport-style photos and application forms. Saved at 300 DPI it is 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 38.1×38.1 mm.
Where it is used
38.1×38.1 mm 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 38.1×38.1 mm photo is usually 32 KB–63 KB. If a form limits the file size, pair it with the compressor.
Same size, other units
38.1×38.1 mm equals 3.81×3.81 cm or 1.5×1.5 in. Enter whichever unit your instructions use — the result is identical.
38.1×38.1 mm at a glance
| Size | 38.1×38.1 mm = 3.81×3.81 cm, 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 | 3.81×3.81 cm, 1.5×1.5 in, 4×4 cm, 36×36 mm |
Resize a photo to 38.1×38.1 mm in 3 steps
- Add your photo — a clear, well-lit original works best.
- The size is already set to 38.1×38.1 mm 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 38.1×38.1 mm.
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:
Why such an odd number?
An inch is exactly 25.4 mm, so a 1.5-inch measurement written in metric becomes 38.1 mm. At 300 DPI that is a tidy 450 × 450 pixels.
Buttons and pin badges. 1.5-inch (38 mm) buttons are a standard badge size. Button makers usually need extra artwork around the edge that wraps behind the badge — check your maker's template, which is often larger than the visible face.
Photos. Some ID cards use a 1.5-inch square photo; frame the face tightly.
Nearby: 1×1 inch, 2×2 inch, 3.5×3.5 cm.
Similar print and photo sizes
Nearby print sizes, saved at 300 DPI so they print at the right size:
Frequently asked questions
How many pixels is 1.5 inches?
450 pixels at 300 DPI, 225 at 150 DPI, or 144 at 96 DPI.
How many photos of 38.1×38.1 mm 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 38.1×38.1 mm 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 38.1×38.1 mm in other units?
38.1×38.1 mm is 3.81×3.81 cm, 1.5×1.5 in. Close sizes that are often confused with it: 3.81×3.81 cm, 1.5×1.5 in.
Why does my 38.1×38.1 mm 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 38.1×38.1 mm.
How large is a 38.1×38.1 mm 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.