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Resize an image to 256×256 pixels
To resize an image to 256×256 px, enter 256 × 256 px and save it as PNG. Shown at 256 CSS px it is sharp on a 1× screen; a 2× screen needs 512×512 px for the same spot. Cropping a 4:3 photo to fill the 1:1 square removes 25%.
256×256 px
PNG · no file-size limit · 256x256 px
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.
256×256 at a glance
| Pixel size | 256×256 px (65,536 pixels) |
|---|---|
| Aspect ratio | 1:1, square (width ÷ height = 1) |
| Megapixels | 0.0655 MP |
| Decoded in memory | 256 KB RGBA · 192 KB RGB |
| Sharp on screen at | 256×256 CSS px at 1×, 128×128 at 2×, 85×85 at 3× density |
| Estimated JPEG (outdoor photo, quality 75) | 17.1 KB |
| JPEG without a KB limit (panel default, quality 85) | 22.8 KB |
| Estimated PNG (flat graphic) | 11.2 KB |
What 256×256 means in pixels
256×256 is a square, 256 pixels on each side, 65,536 pixels in total (0.0655 megapixels). Its sides reduce to 1:1 (1 as a decimal), so any picture cropped to 1:1 scales to it without distortion.
It is thumbnail scale: a 12 MP phone photo carries 186 times more pixels, so the resize discards most of them and the stepped downscale matters for sharpness. On a 2× (high-density) screen this file is sharp at 128 CSS px, on a 3× phone at 85 CSS px; a print at 300 DPI would be only 21.7 mm wide, so it is a screen-only size.
Decoded for editing it occupies 256 KB of memory (4 bytes per pixel); uncompressed 24-bit RGB would be 192 KB, which is why the downloadable JPEG, PNG or WebP is far smaller.
Getting 256×256 from a phone, camera or screenshot
Filling 256×256 from a 12 MP phone photo (4032×3024, 4:3) loses the least (25%); a vertical phone video frame (1080×1920, 9:16) loses the most (43.8%). "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 256×256. From the phone photo PixelFit takes the 3024×3024 crop through 1512×1512, 756×756 and 378×378 before the last step to 256×256, 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) | 3024×3024 (left and right cut) | 25% | 0.085× (reduced) | 256×192 |
| 24 MP camera photo (6000×4000, 3:2) | 4000×4000 (left and right cut) | 33.3% | 0.064× (reduced) | 256×171 |
| Full HD screenshot (1920×1080, 16:9) | 1080×1080 (left and right cut) | 43.8% | 0.237× (reduced) | 256×144 |
| Vertical phone video frame (1080×1920, 9:16) | 1080×1080 (top and bottom cut) | 43.8% | 0.237× (reduced) | 144×256 |
How many KB is a 256×256 image?
Estimated from encodes of real sample images measured with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026, interpolated to 65,536 pixels. The outdoor photo at 256×256 is about 17.1 KB at quality 75 and a scanned page about 11.4 KB; your file will differ with detail and noise.
| Image type | JPEG q60 | JPEG q75 | JPEG q90 | WebP q75 | PNG |
|---|---|---|---|---|---|
| Portrait photo | ≈ 10.3 KB | ≈ 13 KB | ≈ 20.7 KB | ≈ 9.4 KB | ≈ 104 KB |
| Outdoor photo | ≈ 12.9 KB | ≈ 17.1 KB | ≈ 27.9 KB | ≈ 14.8 KB | ≈ 127 KB |
| Scanned document | ≈ 8.5 KB | ≈ 11.4 KB | ≈ 19.3 KB | ≈ 8.8 KB | ≈ 96.8 KB |
| Flat graphic or logo | ≈ 5.1 KB | ≈ 6.3 KB | ≈ 9.6 KB | ≈ 4 KB | ≈ 11.2 KB |
Will a 256×256 photo fit an upload limit?
The highest JPEG or WebP quality that stays under each limit at exactly 256×256 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 10 KB | up to quality 55 | up to quality 41 | up to quality 40 |
| Under 20 KB | up to quality 88 | up to quality 79 | up to quality 82 |
| Under 30 KB | fits at quality 95 | up to quality 90 | up to quality 92 |
256×256 on high-density screens
A screen with a device pixel ratio of 2 draws every CSS pixel with 2×2 device pixels, so an icon shown at 256 CSS px needs a file of 512×512 there. Read the other way, this file is the 2× version of a 128×128 slot.
| Device pixel ratio | 256×256 is sharp up to | File needed for a 256 CSS px slot |
|---|---|---|
| 1× | 256×256 CSS px | 256×256 px |
| 1.5× | 170.7×170.7 CSS px | 384×384 px |
| 2× | 128×128 CSS px | 512×512 px |
| 3× | 85.3×85.3 CSS px | 768×768 px |
| 4× | 64×64 CSS px | 1024×1024 px |
Shrinking a master icon to 256×256
Icons are best drawn large and reduced. PixelFit halves the master while both sides stay at or above 256 px, then makes one last step to 256×256; each pass blends neighbouring pixels, which keeps thin strokes from breaking up.
| Master | Reduction | Passes PixelFit runs |
|---|---|---|
| 1024×1024 | 0.25× (4 times smaller) | 2: 512×512 → 256×256 |
| 512×512 | 0.5× (2 times smaller) | 1: 256×256 |
Making a 256×256 icon
From a 512×512 master icon the reduction is 0.5×, small enough that the artwork usually survives without redrawing. Save icons as PNG to keep transparency and crisp edges; a flat graphic at 256×256 is about 11.2 KB as PNG, against 17.1 KB for a detailed outdoor photo as JPEG at quality 75.
A 256×256 icon is 5.3 times the 48 px edge that Google Search recommends exceeding for favicons, so it can double as the high-resolution favicon.
Other 1:1 sizes
These targets share the exact 1:1 ratio of 256×256, so resizing between them is a pure scale with nothing cropped.
| Size | Scale from 256×256 | Megapixels |
|---|---|---|
| 250×250 square | 0.98× | 0.0625 MP |
| 300×300 square | 1.17× | 0.09 MP |
| 200×200 minimum share image | 0.78× | 0.04 MP |
| 192×192 PWA icon | 0.75× | 0.0369 MP |
| 180×180 apple-touch-icon | 0.7× | 0.0324 MP |
| 167×167 touch icon | 0.65× | 0.0279 MP |
| 400×400 square | 1.56× | 0.16 MP |
| 152×152 touch icon | 0.59× | 0.0231 MP |
How to resize a picture to 256×256
-
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 256 as the width and 256 as the height in pixels (the panel is already set to 256×256).
-
Choose how it fits
Choose crop to fill to keep the 1:1 frame without stretching (a phone photo loses 25%, left and right cut). Fit inside keeps the whole picture as a 256×192 file instead; Pad with colour puts that on a full 256×256 canvas.
-
Pick the format and download
Choose PNG for an icon, then download the 256x256 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 256x256?
Open the image in the PixelFit panel on this page, set 256 × 256 px, choose crop to fill so nothing is stretched and download. From a 12 MP phone photo that crops 25% (left and right cut) and scales the rest by 0.085×.
What aspect ratio is 256x256?
256x256 has an aspect ratio of 1:1: square, width ÷ height = 1. Sizes with the same ratio include 250×250 square, 300×300 square and 200×200 minimum share image.
Which other icon sizes go with 256x256?
For a 256 CSS px slot, a 2× screen needs 512×512 and a 3× phone 768×768. 256x256 is already above the 48×48 px that Google Search recommends exceeding for favicons.
How big is a 256x256 JPEG file?
For a detailed outdoor photo about 17.1 KB at quality 75 (12.9 KB at 60, 27.9 KB at 90, 22.8 KB at the panel's default quality 85); a head-and-shoulders portrait is about 13 KB at quality 75, estimated from measured encodes. A flat graphic is smaller, a noisy low-light photo larger.
Related
Same 1:1 ratio
Nearby sizes
- 300×250 banner 6:5
- 200×230 px photo 20:23
- 336×280 banner 6:5
- 320×240 (QVGA) 4:3