Updated · how we check
Resize a photo to 6×4 in (1800×1200 pixels)
A 6×4 in print at 300 DPI is 1800×1200 pixels. Set 6×4 in and 300 DPI in the panel and choose crop to fill: a 4:3 phone photo loses 11.1% and still gives 672 pixels per inch. As a JPEG, a detailed outdoor photo comes to about 716 KB at the panel's default quality 85 and 544 KB at quality 75.
6×4 in at 300 DPI (1800×1200 px)
JPG · no file-size limit · 6x4 in at 300 DPI · white background
No file-size limit is set: PixelFit saves at high quality and changes only the format and any pixel size you set. 6x4 in at 300 DPI is 1800x1200 pixels.
Fit, background and padding crop to fill · white background
Saving presets is part of Pro.
The result appears here: the exact byte count, pixel size and quality, the size before and after, a preview and a download button.
The batch kit (one ZIP for up to 500 photos, several photos merged into one PDF) is part of Pro.
6×4 in at a glance
| Physical size | 6×4 in = 152.4×101.6 mm |
|---|---|
| Pixels at 300 DPI | 1800×1200 px (2,160,000 pixels, 2.16 MP) |
| Shape | 3:2, landscape (width ÷ height = 1.5) |
| From a 12 MP phone photo | 672 pixels per inch after the crop to fill (11.1% cut) |
| Copies per sheet | 1 on 4×6 in · 2 on A4 · 2 on US Letter |
| At 600 DPI | 3600×2400 px (8.64 MP) |
| Resampling passes from a phone photo | 4032×2688 crop → 2016×1344 → 1800×1200 |
| Estimated JPEG (outdoor photo, quality 75, 300 DPI) | 544 KB |
| JPEG without a KB limit (panel default, quality 85) | 716 KB |
How 6×4 in turns into pixels
An inch is exactly 25.4 mm, so at 300 DPI the pixel size is 6 in × 300 = 1800 px wide and 4 in × 300 = 1200 px tall. 6×4 in is a landscape shape with sides in the ratio 3:2 (1.5 as a decimal), 152.4×101.6 mm in the other unit.
The same 6×4 in needs 1200×800 px at 200 DPI and 3600×2400 px (8.64 MP) at 600 DPI. PixelFit writes the DPI you set into the JPEG header (the JFIF density field), so print software that reads it knows the file is meant to come out at 6×4 in.
Is your photo sharp enough for 6×4 in?
After the crop to fill, this is how many source pixels land on each inch of 6×4 in. Above 300 DPI the picture is reduced to 300 DPI; below it, PixelFit has to enlarge the crop and fine detail softens.
| Starting image | Crop to fill keeps | Area lost | Pixels per inch at 6×4 in | To reach 300 DPI |
|---|---|---|---|---|
| 12 MP phone photo (4032×3024, 4:3) | 4032×2688 (top and bottom cut) | 11.1% | 672 DPI | reduced (0.45×) |
| 24 MP camera photo (6000×4000, 3:2) | 6000×4000 (nothing cut) | 0% | 1,000 DPI | reduced (0.3×) |
| Full HD screenshot (1920×1080, 16:9) | 1620×1080 (left and right cut) | 15.6% | 270 DPI | enlarged (1.11×) |
| Vertical phone video frame (1080×1920, 9:16) | 1080×720 (top and bottom cut) | 62.5% | 180 DPI | enlarged (1.67×) |
6×4 in in pixels at each print resolution
Pixels = inches × DPI. The panel uses 300 DPI unless you change it; the file sizes are for a detailed outdoor photo saved as JPEG.
| Resolution | Pixels | Megapixels | JPEG q75 | JPEG q90 |
|---|---|---|---|---|
| 150 DPI | 900×600 | 0.54 MP | ≈ 136 KB | ≈ 220 KB |
| 200 DPI | 1200×800 | 0.96 MP | ≈ 246 KB | ≈ 394 KB |
| 300 DPI | 1800×1200 | 2.16 MP | ≈ 544 KB | ≈ 870 KB |
| 400 DPI | 2400×1600 | 3.84 MP | ≈ 931 KB | ≈ 1.46 MB |
| 600 DPI | 3600×2400 | 8.64 MP | ≈ 1.87 MB | ≈ 3.04 MB |
How large is a 6×4 in file?
Saved at 300 DPI (1800×1200 px), a detailed outdoor photo of 6×4 in comes to about 412 KB at JPEG quality 60, 544 KB at 75 and 870 KB at 90, and about 476 KB as WebP at 75. Dropping to 200 DPI (1200×800 px) brings quality 75 down to about 246 KB, but the print then holds fewer pixels per inch.
At 300 DPI the photo does not fit under 200 KB even at quality 30; it fits under 500 KB up to quality 69 and under 1 MB up to quality 92; under 2 MB it fits even at quality 95. Set the KB limit next to the size and PixelFit picks the highest quality that fits.
Printing 6×4 in copies
Without margins or cutting gaps, 1 copy fits on one 4×6 in (102×152 mm) photo print, 2 on an A4 sheet, 2 on US Letter (some turned sideways where that packs more). Print at 100% scale, never "fit to page", or a print of 6×4 in comes out the wrong size; 1800×1200 px at 300 DPI is exact.
Other 3:2 print and photo sizes
These sizes have the same 3:2 shape as 6×4 in, so a photo cropped for one fits the others with no further crop.
| Size | Pixels | Scale from 6×4 in |
|---|---|---|
| 1500×1000 landscape | 1500×1000 | 0.83× |
| 2400×1600 landscape | 2400×1600 | 1.33× |
| 1200×800 landscape | 1200×800 | 0.67× |
| 3000×2000 landscape | 3000×2000 | 1.67× |
| 900×600 landscape | 900×600 | 0.5× |
| 600×400 landscape | 600×400 | 0.33× |
| 300×200 landscape | 300×200 | 0.17× |
How to resize a picture to 6×4 in
-
Add the picture
Drop, paste or pick the photo in the PixelFit panel at the top of this page; it is decoded in your browser and never uploaded.
-
Set the size
Pick inch as the unit, enter 6×4 in and 300 DPI; the tool turns that into 1800×1200 pixels.
-
Choose how it fits
Choose crop to fill to keep the 3:2 frame without stretching (a phone photo loses 11.1%, top and bottom cut). Fit inside keeps the whole picture as a 1600×1200 file instead; Pad with colour puts that on a full 1800×1200 canvas.
-
Pick the format and download
Keep JPG (without a KB limit PixelFit saves at quality 85, about 716 KB for a detailed outdoor photo) so the 300 DPI stamp travels with the file, or choose PDF to get the picture as a PDF page, then download.
Sources
- Inch (1 inch is exactly 25.4 mm), Wikipedia, checked 31 October 2026: en.wikipedia.org/wiki/Inch
- Measured by PixelFit with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026, from the sample photo Hartz Lake at Hartz Mountain.jpg by JustinH (Wikimedia Commons user) (CC0 1.0): commons.wikimedia.org/wiki/File:Hartz_Lake_at_Hartz_Mount…
Frequently asked questions
How do I resize a photo to 6×4 in?
Open the photo in the PixelFit panel on this page, set 6×4 in at 300 DPI (1800 × 1200 px), choose crop to fill and download. From a 12 MP phone photo that crops 11.1% (top and bottom cut) and still leaves 672 pixels per inch to work with.
How many pixels is 6×4 in?
6×4 in is 1800×1200 px at 300 DPI, 3600×2400 px at 600 DPI and 900×600 px at 150 DPI (pixels = inches × DPI).
What DPI should a 6×4 in photo have?
PixelFit uses 300 DPI, which makes 6×4 in exactly 1800×1200 px; print it at 100% scale. At 150 DPI the same 1800×1200 pixels would print 12×8 in, twice as large and with half the density.
How many 6×4 in photos fit on one sheet?
Without margins, 2 fit on A4 (210×297 mm), 2 on US Letter and 1 on a 4×6 in photo print, turning them sideways where that packs more. Leave a few millimetres for cutting.
How big is a 6×4 in JPEG at 300 DPI?
For a detailed outdoor photo about 544 KB at quality 75 (412 KB at 60, 870 KB at 90, 716 KB at the panel's default quality 85); a head-and-shoulders portrait is about 187 KB at quality 75, estimated from measured encodes of real sample photos at 1800×1200 px.
Related
Same 3:2 ratio
Nearby sizes
- 1920×1200 (WUXGA) 8:5
- 1680×1050 (WSXGA+) 8:5
- 1600×1200 (UXGA) 4:3
- 1920×1080 (FHD) 16:9
- 2048×1080 (DCI 2K) 256:135 (about 1.91:1)
- 7×5 inch print 7:5