- Runs in your browser
- No upload
- Free, no signup
The target here is 256 × 256 px: a square 1:1 image of 0.07 megapixels. The preset fills in both dimensions for you, so you only need to add the photo and download the result.
The preset is named for Slack. It outputs exactly 256 × 256 px; platforms change what they recommend from time to time, so confirm the current figure in Slack's own help pages if exact compliance matters.
| Output size | 256 × 256 px |
|---|---|
| Aspect ratio | 1:1 (square) |
| Total pixels | 65536 (0.07 MP) |
| Prints at 300 DPI | 0.9 × 0.9 in (2.2 × 2.2 cm) |
Fitting a photo into 256 × 256 px
Resizing to a fixed width and height only gives a clean result when the photo has the same shape as the target. A shape mismatch has two outcomes: the picture is stretched, or part of it is cropped. Crop first, then resize, so you decide what is cut. This is how much of each common photo would be lost to fill 1:1:
| Starting photo | Cropped away to fill the shape |
|---|---|
| Phone photo (4000 × 3000, 4:3) | About 25% of the image |
| DSLR photo (6000 × 4000, 3:2) | About 33% of the image |
| Video frame (1920 × 1080, 16:9) | About 44% of the image |
| Portrait phone photo (3000 × 4000, 3:4) | About 25% of the image |
Size, quality and file weight
65536 pixels saved as a JPG at web quality typically weigh about 6.4 KB to 19.2 KB, depending on how much detail the picture contains. Flat graphics and screenshots saved as PNG compress very well when colors are simple, and poorly when they contain photographic gradients.
For photos, JPG or WebP are good choices; for logos, text or transparency, PNG keeps edges clean.
How large can it be printed?
These figures follow from the pixel count: print size = pixels ÷ DPI. Going above the 300 DPI row gives no visible benefit; going below it looks softer.
| Quality | DPI | Print size |
|---|---|---|
| Screen-resolution draft | 72 | 3.6 × 3.6 in (9 × 9 cm) |
| Acceptable for posters | 150 | 1.7 × 1.7 in (4.3 × 4.3 cm) |
| Photo quality | 300 | 0.9 × 0.9 in (2.2 × 2.2 cm) |
About the Slack preset
ResizeAny sets the output to 256 × 256 px and nothing else. It does not know which placement or account type you are using, and Slack may crop, recompress or re-scale an upload on its side. Keep important content away from the edges, and check Slack's current guidelines for the placement you are working on.
How to resize an image for Slack Workspace Logo 256x256
- Add your image. Select a photo or drag it onto the box above. JPG, PNG, WebP, AVIF, HEIC and BMP files are accepted, and the file stays on your device.
- Crop to 1:1 (recommended). The output is 256 × 256 px, a 1:1 shape. Cropping to that shape first with the built-in Crop tool decides what stays in frame and avoids distortion.
- Confirm the size and format. The preset fills in 256 × 256 px. Choose JPG for photos or PNG for graphics with sharp edges or transparency.
- Download the resized image. Click resize and save the file. The result uses Lanczos-3 resampling, which keeps edges clean when scaling down.
Related presets
Other presets with the same output size
Nearby sizes in this category
More 1:1 presets
More in this category: Social Media & Community Image Sizes. For several photos at once, use the bulk image resizer.
Frequently asked questions
How do I resize an image for Slack Workspace Logo 256x256 without stretching it?▼
What aspect ratio is 256 × 256?▼
How big will a 256 × 256 file be?▼
What if my photo is smaller than 256 × 256?▼
Which format should I use for 256 × 256?▼
How large can I print a 256 × 256 px image?▼
Is my image uploaded anywhere?▼
Looking for a different size or format?
Explore over 1,500+ curated presets for social media, print, and strict file sizes.