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Resize an image to 100×100 pixels
To resize an image to 100×100 px, enter 100 × 100 px and pick crop to fill so the 1:1 frame is not stretched: a 4:3 phone photo loses 25% of its area (a centred 3024×3024 crop). The result has 0.01 megapixels; as a JPEG, a detailed outdoor photo is about 4.2 KB at the panel's default quality 85 (3.2 KB at quality 75).
100×100 px
JPG · no file-size limit · 100x100 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.
100×100 at a glance
| Pixel size | 100×100 px (10,000 pixels) |
|---|---|
| Aspect ratio | 1:1, square (width ÷ height = 1) |
| Megapixels | 0.01 MP |
| Decoded in memory | 39.1 KB RGBA · 29.3 KB RGB |
| Sharp on screen at | 100×100 CSS px at 1×, 50×50 at 2×, 33×33 at 3× density |
| Print size at 300 DPI | 0.33×0.33 in (0.8×0.8 cm) |
| Estimated JPEG (outdoor photo, quality 75) | 3.2 KB |
| JPEG without a KB limit (panel default, quality 85) | 4.2 KB |
What 100×100 means in pixels
100×100 is a square, 100 pixels on each side, 10,000 pixels in total (0.01 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 1,219 times more pixels, so the resize discards most of them and the stepped downscale matters for sharpness. Shown 1:1 it fills 100×100 CSS px on a standard screen and 50×50 CSS px on a 2× (Retina-class) screen; at 72 DPI the same pixels span 1.4×1.4 inches.
Decoded for editing it occupies 39.1 KB of memory (4 bytes per pixel); uncompressed 24-bit RGB would be 29.3 KB, which is why the downloadable JPEG, PNG or WebP is far smaller.
Getting 100×100 from a phone, camera or screenshot
Filling 100×100 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 100×100. From the phone photo PixelFit takes the 3024×3024 crop through 1512×1512, 756×756, 378×378 and 189×189 before the last step to 100×100, 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% | 0.033× (reduced) | 100×75 |
| 24 MP camera photo (6000×4000, 3:2) | 4000×4000 (left and right cut) | 33.3% | 0.025× (reduced) | 100×67 |
| Full HD screenshot (1920×1080, 16:9) | 1080×1080 (left and right cut) | 43.8% | 0.093× (reduced) | 100×56 |
| Vertical phone video frame (1080×1920, 9:16) | 1080×1080 (top and bottom cut) | 43.8% | 0.093× (reduced) | 56×100 |
How many KB is a 100×100 image?
Estimated from encodes of real sample images measured with sharp 0.35.5 / libvips 8.18.7 on 31 October 2026, interpolated to 10,000 pixels. The outdoor photo at 100×100 is about 3.2 KB at quality 75 and a scanned page about 1.8 KB; your file will differ with detail and noise.
| Image type | JPEG q60 | JPEG q75 | JPEG q90 | WebP q75 | PNG |
|---|---|---|---|---|---|
| Portrait photo | ≈ 2.6 KB | ≈ 3.3 KB | ≈ 5 KB | ≈ 2.8 KB | ≈ 19.8 KB |
| Outdoor photo | ≈ 2.5 KB | ≈ 3.2 KB | ≈ 5 KB | ≈ 2.7 KB | ≈ 20.6 KB |
| Scanned document | ≈ 1.4 KB | ≈ 1.8 KB | ≈ 3.1 KB | ≈ 1.2 KB | ≈ 15.1 KB |
| Flat graphic or logo | ≈ 1.7 KB | ≈ 2.1 KB | ≈ 3.1 KB | ≈ 1.4 KB | ≈ 3.7 KB |
Will a 100×100 photo fit an upload limit?
The highest JPEG or WebP quality that stays under each limit at exactly 100×100 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 | fits at quality 95 | fits at quality 95 | fits at quality 95 |
| Under 20 KB | fits at quality 95 | fits at quality 95 | fits at quality 95 |
| Under 30 KB | fits at quality 95 | fits at quality 95 | fits at quality 95 |
Is 100×100 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, 100×100 covers 0.33×0.33 in; at 150 DPI the same pixels stretch to 0.67×0.67 in with half the density.
| Resolution | Print size (inches) | Print size (cm) |
|---|---|---|
| 72 DPI | 1.39×1.39 in | 3.5×3.5 cm |
| 96 DPI | 1.04×1.04 in | 2.6×2.6 cm |
| 150 DPI | 0.67×0.67 in | 1.7×1.7 cm |
| 200 DPI | 0.5×0.5 in | 1.3×1.3 cm |
| 300 DPI | 0.33×0.33 in | 0.8×0.8 cm |
| 600 DPI | 0.17×0.17 in | 0.4×0.4 cm |
How 100×100 shows on common screens
Shown full screen without cropping, 100×100 is scaled by the factor below; bars fill the space where the shapes differ.
| Screen | Scale | Shown at | Bars |
|---|---|---|---|
| Laptop 1366×768 | 7.68× (enlarged) | 768×768 | 598 px left and right in total |
| Full HD 1920×1080 | 10.8× (enlarged) | 1080×1080 | 840 px left and right in total |
| QHD 2560×1440 | 14.4× (enlarged) | 1440×1440 | 1120 px left and right in total |
| 4K UHD 3840×2160 | 21.6× (enlarged) | 2160×2160 | 1680 px left and right in total |
| Phone, portrait 1080×1920 | 10.8× (enlarged) | 1080×1080 | 840 px top and bottom in total |
Other 1:1 sizes
These targets share the exact 1:1 ratio of 100×100, so resizing between them is a pure scale with nothing cropped.
| Size | Scale from 100×100 | Megapixels |
|---|---|---|
| 96×96 icon | 0.96× | 0.0092 MP |
| 128×128 app icon | 1.28× | 0.0164 MP |
| 144×144 app icon | 1.44× | 0.0207 MP |
| 150×150 square | 1.5× | 0.0225 MP |
| 152×152 touch icon | 1.52× | 0.0231 MP |
| 64×64 icon | 0.64× | 0.0041 MP |
| 167×167 touch icon | 1.67× | 0.0279 MP |
| 180×180 apple-touch-icon | 1.8× | 0.0324 MP |
How to resize a picture to 100×100
-
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 100 as the width and 100 as the height in pixels (the panel is already set to 100×100).
-
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 100×75 file instead; Pad with colour puts that on a full 100×100 canvas.
-
Pick the format and download
Choose JPG or WebP; without a KB limit PixelFit saves JPG at quality 85, about 4.2 KB for a detailed outdoor photo. Add a KB limit if the upload has one or the file should be smaller, then download the 100x100 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 100x100?
Open the image in the PixelFit panel on this page, set 100 × 100 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 0.033×.
What aspect ratio is 100x100?
100x100 has an aspect ratio of 1:1: square, width ÷ height = 1. Sizes with the same ratio include 96×96 icon, 128×128 app icon and 144×144 app icon.
Is 100x100 good for print?
At 300 DPI 100x100 prints 0.33×0.33 in (0.8×0.8 cm), smaller than a passport photo, so it is a screen size rather than a print size. At 150 DPI it stretches to 0.67×0.67 in.
How big is a 100x100 JPEG file?
For a detailed outdoor photo about 3.2 KB at quality 75 (2.5 KB at 60, 5 KB at 90, 4.2 KB at the panel's default quality 85); a head-and-shoulders portrait is about 3.3 KB at quality 75, estimated from measured encodes. A flat graphic is smaller, a noisy low-light photo larger.
How does 100x100 look on a high-density screen?
On a 2× screen 100x100 is sharp when shown at 50×50 CSS px; shown larger, the browser enlarges it. A slot of 100×100 CSS px on a 2× screen needs a 200×200 file.