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Resize an image to 900×1200 pixels
To resize an image to 900×1200 px, enter 900 × 1200 px and pick crop to fill so the 3:4 frame is not stretched: a 4:3 phone photo loses 43.8% of its area (a centred 2268×3024 crop). The result has 1.08 megapixels; as a JPEG, a detailed outdoor photo is about 367 KB at the panel's default quality 85 (278 KB at quality 75).
900×1200 px
JPG · no file-size limit · 900x1200 px · white background
No file-size limit is set: PixelFit saves at high quality and changes only the format and any pixel size you set.
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.
900×1200 at a glance
| Pixel size | 900×1200 px (1,080,000 pixels) |
|---|---|
| Aspect ratio | 3:4, portrait (width ÷ height = 0.75) |
| Megapixels | 1.08 MP |
| Decoded in memory | 4.12 MB RGBA · 3.09 MB RGB |
| Sharp on screen at | 900×1200 CSS px at 1×, 450×600 at 2×, 300×400 at 3× density |
| Print size at 300 DPI | 3×4 in (7.6×10.2 cm) |
| Estimated JPEG (outdoor photo, quality 75) | 278 KB |
| JPEG without a KB limit (panel default, quality 85) | 367 KB |
What 900×1200 means in pixels
900×1200 is a portrait frame, 1.33 times as tall as it is wide, 1,080,000 pixels in total (1.08 megapixels). Its sides reduce to 3:4 (0.75 as a decimal), so any picture cropped to 3:4 scales to it without distortion.
A 12 MP phone photo has 11 times as many pixels, so reaching 900×1200 is a clean reduction with no invented detail. Shown 1:1 it fills 900×1200 CSS px on a standard screen and 450×600 CSS px on a 2× (Retina-class) screen; at 72 DPI the same pixels span 12.5×16.7 inches.
Decoded for editing it occupies 4.12 MB of memory (4 bytes per pixel); uncompressed 24-bit RGB would be 3.09 MB, which is why the downloadable JPEG, PNG or WebP is far smaller.
Getting 900×1200 from a phone, camera or screenshot
Filling 900×1200 from a vertical phone video frame (1080×1920, 9:16) loses the least (25%); a Full HD screenshot (1920×1080, 16:9) loses the most (57.8%). "Fit inside" keeps the whole picture instead and the file comes out at the size in the last column; "Pad with colour" adds bars to reach the full 900×1200. From the phone photo PixelFit takes the 2268×3024 crop through 1134×1512 before the last step to 900×1200, so each pass blends neighbouring pixels instead of skipping them.
| Starting image | Crop to fill keeps | Area lost | Scale | Fit inside gives |
|---|---|---|---|---|
| 12 MP phone photo (4032×3024, 4:3) | 2268×3024 (left and right cut) | 43.8% | 0.397× (reduced) | 900×675 |
| 24 MP camera photo (6000×4000, 3:2) | 3000×4000 (left and right cut) | 50% | 0.3× (reduced) | 900×600 |
| Full HD screenshot (1920×1080, 16:9) | 810×1080 (left and right cut) | 57.8% | 1.111× (enlarged) | 900×506 |
| Vertical phone video frame (1080×1920, 9:16) | 1080×1440 (top and bottom cut) | 25% | 0.833× (reduced) | 675×1200 |
When 900×1200 means enlarging
After the crop to fill, the kept region has to be enlarged 1.111× from a Full HD screenshot. Enlarging adds pixels but no detail, so start from the largest original you have, or choose a smaller target if the destination allows it: 800×1200 portrait or 1024×1024 square would need less stretching.
How many KB is a 900×1200 image?
Estimated from encodes of real sample images measured with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026, interpolated to 1,080,000 pixels. The outdoor photo at 900×1200 is about 278 KB at quality 75 and a scanned page about 147 KB; your file will differ with detail and noise.
| Image type | JPEG q60 | JPEG q75 | JPEG q90 | WebP q75 | PNG |
|---|---|---|---|---|---|
| Portrait photo | ≈ 79.7 KB | ≈ 106 KB | ≈ 187 KB | ≈ 54 KB | ≈ 1.35 MB |
| Outdoor photo | ≈ 209 KB | ≈ 278 KB | ≈ 445 KB | ≈ 245 KB | ≈ 2.07 MB |
| Scanned document | ≈ 112 KB | ≈ 147 KB | ≈ 250 KB | ≈ 91.9 KB | ≈ 1.25 MB |
| Flat graphic or logo | ≈ 29 KB | ≈ 35.6 KB | ≈ 52.5 KB | ≈ 19.6 KB | ≈ 57.6 KB |
Will a 900×1200 photo fit an upload limit?
The highest JPEG or WebP quality that stays under each limit at exactly 900×1200 px, from the same measurements. Set the KB limit next to the pixel size and PixelFit runs this search on your own photo.
| Limit | Portrait, JPEG | Outdoor photo, JPEG | Outdoor photo, WebP |
|---|---|---|---|
| Under 100 KB | up to quality 71 | does not fit even at quality 30 | does not fit even at quality 30 |
| Under 200 KB | up to quality 90 | up to quality 55 | up to quality 52 |
| Under 500 KB | fits at quality 95 | up to quality 91 | up to quality 92 |
Is 900×1200 good for print?
Pixels carry no physical size until you pick a DPI. At 300 DPI, the resolution PixelFit uses for its print and ID photo sizes, 900×1200 covers 3×4 in; at 150 DPI the same pixels stretch to 6×8 in with half the density.
| Resolution | Print size (inches) | Print size (cm) |
|---|---|---|
| 72 DPI | 12.5×16.67 in | 31.8×42.3 cm |
| 96 DPI | 9.38×12.5 in | 23.8×31.8 cm |
| 150 DPI | 6×8 in | 15.2×20.3 cm |
| 200 DPI | 4.5×6 in | 11.4×15.2 cm |
| 300 DPI | 3×4 in | 7.6×10.2 cm |
| 600 DPI | 1.5×2 in | 3.8×5.1 cm |
How 900×1200 shows on common screens
Shown full screen without cropping, 900×1200 is scaled by the factor below; bars fill the space where the shapes differ.
| Screen | Scale | Shown at | Bars |
|---|---|---|---|
| Laptop 1366×768 | 0.64× (reduced) | 576×768 | 790 px left and right in total |
| Full HD 1920×1080 | 0.9× (reduced) | 810×1080 | 1110 px left and right in total |
| QHD 2560×1440 | 1.2× (enlarged) | 1080×1440 | 1480 px left and right in total |
| 4K UHD 3840×2160 | 1.8× (enlarged) | 1620×2160 | 2220 px left and right in total |
| Phone, portrait 1080×1920 | 1.2× (enlarged) | 1080×1440 | 480 px top and bottom in total |
Other 3:4 sizes
These targets share the exact 3:4 ratio of 900×1200, so resizing between them is a pure scale with nothing cropped.
| Size | Scale from 900×1200 | Megapixels |
|---|---|---|
| 768×1024 portrait | 0.85× | 0.79 MP |
| 1080×1440 portrait | 1.2× | 1.56 MP |
| 1200×1600 portrait | 1.33× | 1.92 MP |
| 600×800 portrait | 0.67× | 0.48 MP |
| 480×640 portrait | 0.53× | 0.31 MP |
| 300×400 portrait | 0.33× | 0.12 MP |
| 150×200 px photo | 0.17× | 0.03 MP |
| 30×40 mm photo | 0.39× | 0.17 MP |
How to resize a picture to 900×1200
-
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
Enter 900 as the width and 1200 as the height in pixels (the panel is already set to 900×1200).
-
Choose how it fits
Choose crop to fill to keep the 3:4 frame without stretching (a phone photo loses 43.8%, left and right cut). Fit inside keeps the whole picture as a 900×675 file instead; Pad with colour puts that on a full 900×1200 canvas.
-
Pick the format and download
Choose JPG or WebP; without a KB limit PixelFit saves JPG at quality 85, about 367 KB for a detailed outdoor photo. Add a KB limit if the upload has one or the file should be smaller, then download the 900x1200 file.
Sources
- 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 an image to 900x1200?
Open the image in the PixelFit panel on this page, set 900 × 1200 px, choose crop to fill so nothing is stretched and download. From a 12 MP phone photo that crops 43.8% (left and right cut) and scales the rest by 0.397×.
What aspect ratio is 900x1200?
900x1200 has an aspect ratio of 3:4: portrait, width ÷ height = 0.75. Sizes with the same ratio include 768×1024 portrait, 1080×1440 portrait and 1200×1600 portrait.
Is 900x1200 good for print?
At 300 DPI 900x1200 prints 3×4 in (7.6×10.2 cm), enough for a print of that size at full density. At 150 DPI it stretches to 6×8 in.
How big is a 900x1200 JPEG file?
For a detailed outdoor photo about 278 KB at quality 75 (209 KB at 60, 445 KB at 90, 367 KB at the panel's default quality 85); a head-and-shoulders portrait is about 106 KB at quality 75, estimated from measured encodes. A flat graphic is smaller, a noisy low-light photo larger.
How does 900x1200 look on a high-density screen?
On a 2× screen 900x1200 is sharp when shown at 450×600 CSS px; shown larger, the browser enlarges it. A slot of 900×1200 CSS px on a 2× screen needs an 1800×2400 file.
Related
Same 3:4 ratio
Nearby sizes
- 800×1200 portrait 2:3
- 1080×1350 portrait 4:5
- 1000×1500 portrait 2:3
- 1024×1024 square 1:1
- 1200×1500 portrait 4:5
- 1000×1000 square 1:1