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Resize an image to 512×512 pixels
To resize an image to 512×512 px, enter 512 × 512 px and save it as PNG. Shown at 512 CSS px it is sharp on a 1× screen; a 2× screen needs 1024×1024 px for the same spot. Cropping a 4:3 photo to fill the 1:1 square removes 25%.
512×512 px
PNG · no file-size limit · 512x512 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.
512×512 at a glance
| Pixel size | 512×512 px (262,144 pixels) |
|---|---|
| Aspect ratio | 1:1, square (width ÷ height = 1) |
| Megapixels | 0.26 MP |
| Decoded in memory | 1 MB RGBA · 768 KB RGB |
| Sharp on screen at | 512×512 CSS px at 1×, 256×256 at 2×, 171×171 at 3× density |
| Estimated JPEG (outdoor photo, quality 75) | 66.3 KB |
| JPEG without a KB limit (panel default, quality 85) | 88.7 KB |
| Estimated PNG (flat graphic) | 26 KB |
What 512×512 means in pixels
512×512 is a square, 512 pixels on each side, 262,144 pixels in total (0.26 megapixels). Its sides reduce to 1:1 (1 as a decimal), so any picture cropped to 1:1 scales to it without distortion.
A 12 MP phone photo has 47 times as many pixels, so reaching 512×512 is a clean reduction with no invented detail. On a 2× (high-density) screen this file is sharp at 256 CSS px, on a 3× phone at 171 CSS px; a print at 300 DPI would be only 43.3 mm wide, so it is a screen-only size.
Decoded for editing it occupies 1 MB of memory (4 bytes per pixel); uncompressed 24-bit RGB would be 768 KB, which is why the downloadable JPEG, PNG or WebP is far smaller.
Where 512×512 is used
Each line comes from the page listed under Sources, checked October 2026. Platform sizes change, so check the source before you rely on it.
- Web app manifest icon: Chromium needs at least a 192×192 and a 512×512 icon.
Getting 512×512 from a phone, camera or screenshot
Filling 512×512 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 512×512. From the phone photo PixelFit takes the 3024×3024 crop through 1512×1512 and 756×756 before the last step to 512×512, 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% | 0.169× (reduced) | 512×384 |
| 24 MP camera photo (6000×4000, 3:2) | 4000×4000 (left and right cut) | 33.3% | 0.128× (reduced) | 512×341 |
| Full HD screenshot (1920×1080, 16:9) | 1080×1080 (left and right cut) | 43.8% | 0.474× (reduced) | 512×288 |
| Vertical phone video frame (1080×1920, 9:16) | 1080×1080 (top and bottom cut) | 43.8% | 0.474× (reduced) | 288×512 |
How many KB is a 512×512 image?
Estimated from encodes of real sample images measured with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026, interpolated to 262,144 pixels. The outdoor photo at 512×512 is about 66.3 KB at quality 75 and a scanned page about 43.6 KB; your file will differ with detail and noise.
| Image type | JPEG q60 | JPEG q75 | JPEG q90 | WebP q75 | PNG |
|---|---|---|---|---|---|
| Portrait photo | ≈ 27.8 KB | ≈ 35.8 KB | ≈ 58.6 KB | ≈ 21.7 KB | ≈ 365 KB |
| Outdoor photo | ≈ 49.5 KB | ≈ 66.3 KB | ≈ 108 KB | ≈ 58.5 KB | ≈ 509 KB |
| Scanned document | ≈ 33.2 KB | ≈ 43.6 KB | ≈ 72.1 KB | ≈ 31.4 KB | ≈ 356 KB |
| Flat graphic or logo | ≈ 11.8 KB | ≈ 14.7 KB | ≈ 21.9 KB | ≈ 8.7 KB | ≈ 26 KB |
Will a 512×512 photo fit an upload limit?
The highest JPEG or WebP quality that stays under each limit at exactly 512×512 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 20 KB | up to quality 34 | does not fit even at quality 30 | does not fit even at quality 30 |
| Under 30 KB | up to quality 63 | does not fit even at quality 30 | does not fit even at quality 30 |
| Under 50 KB | up to quality 85 | up to quality 59 | up to quality 57 |
| Under 100 KB | fits at quality 95 | up to quality 87 | up to quality 89 |
512×512 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 512 CSS px needs a file of 1024×1024 there. Read the other way, this file is the 2× version of a 256×256 slot.
| Device pixel ratio | 512×512 is sharp up to | File needed for a 512 CSS px slot |
|---|---|---|
| 1× | 512×512 CSS px | 512×512 px |
| 1.5× | 341.3×341.3 CSS px | 768×768 px |
| 2× | 256×256 CSS px | 1024×1024 px |
| 3× | 170.7×170.7 CSS px | 1536×1536 px |
| 4× | 128×128 CSS px | 2048×2048 px |
Shrinking a master icon to 512×512
Icons are best drawn large and reduced. PixelFit halves the master while both sides stay at or above 512 px, then makes one last step to 512×512; each pass blends neighbouring pixels, which keeps thin strokes from breaking up.
| Master | Reduction | Passes PixelFit runs |
|---|---|---|
| 1024×1024 | 0.5× (2 times smaller) | 1: 512×512 |
Making a 512×512 icon
512×512 is the largest icon Chromium requires in a web app manifest (larger sizes are allowed), so draw or export it from vector art and derive the smaller icons from it. Save icons as PNG to keep transparency and crisp edges; a flat graphic at 512×512 is about 26 KB as PNG, against 66.3 KB for a detailed outdoor photo as JPEG at quality 75.
A 512×512 icon is 11 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 512×512, so resizing between them is a pure scale with nothing cropped.
| Size | Scale from 512×512 | Megapixels |
|---|---|---|
| 500×500 square | 0.98× | 0.25 MP |
| 600×600 square | 1.17× | 0.36 MP |
| 400×400 square | 0.78× | 0.16 MP |
| 700×700 square | 1.37× | 0.49 MP |
| 800×800 square | 1.56× | 0.64 MP |
| 300×300 square | 0.59× | 0.09 MP |
| 900×900 square | 1.76× | 0.81 MP |
| 1000×1000 square | 1.95× | 1 MP |
How to resize a picture to 512×512
-
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 512 as the width and 512 as the height in pixels (the panel is already set to 512×512).
-
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 512×384 file instead; Pad with colour puts that on a full 512×512 canvas.
-
Pick the format and download
Choose PNG for an icon, then download the 512x512 file.
Sources
- Add a web app manifest, web.dev, checked 31 October 2026: web.dev/articles/add-manifest
- 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 512x512?
Open the image in the PixelFit panel on this page, set 512 × 512 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 0.169×.
What aspect ratio is 512x512?
512x512 has an aspect ratio of 1:1: square, width ÷ height = 1. Sizes with the same ratio include 500×500 square, 600×600 square and 400×400 square.
Which other icon sizes go with 512x512?
For a 512 CSS px slot, a 2× screen needs 1024×1024 and a 3× phone 1536×1536. 512x512 is already above the 48×48 px that Google Search recommends exceeding for favicons.
How big is a 512x512 JPEG file?
For a detailed outdoor photo about 66.3 KB at quality 75 (49.5 KB at 60, 108 KB at 90, 88.7 KB at the panel's default quality 85); a head-and-shoulders portrait is about 35.8 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
- 40×50 mm photo 472:591 (about 4:5)
- 420×525 px photo 4:5