Does Sharpen Image upload my file or text to Tool-You servers?

No. Sharpen Image runs in this browser tab. Files stay on the device. Limit note: Kernel 1–4. PNG. Borders 1px unchanged. First GIF frame. Max 20 MB.

Should I use Blur Image instead of Sharpen Image?

Use Sharpen Image when you need Apply a 3x3 unsharp kernel. Use Blur Image when you need Soften an image. They share a category (Images) but not the same job.

Sharpen Image

Apply a 3x3 unsharp kernel.

Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay.

What Sharpen Image does

Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay.

This URL is only for Sharpen Image (sharpen image). Apply a 3x3 unsharp kernel. Other Images tools on Tool-You look similar in the chrome, so the job definition below is the part that belongs to Sharpen Image alone: Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay.

How to use Sharpen Image

Stay on this Sharpen Image page (/sharpen-image). Do not switch to Blur Image unless you actually want Soften an image..
Add the file type Sharpen Image accepts. Hint from the path: sharpen image. Apply a 3x3 unsharp kernel.
Set only the options that match Sharpen Image. Neighbor Image Contrast does something else (Raise or lower contrast.). Tool note: Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay.
Run Sharpen Image in this tab. Browser memory still applies: Kernel 1–4. PNG. Borders 1px unchanged. First GIF frame. Max 20 MB.
Download or copy the result from Sharpen Image. If it is the wrong job, open Blur Image instead.

When not to use Sharpen Image

Skip Sharpen Image when a neighbor tool matches better — start with Blur Image or Image Contrast — or when the description already warns the job will fail. In the tool’s own words: Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay.

Questions about Sharpen Image

What does Sharpen Image do that other Images pages on this site do not?: Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay. Short version: Apply a 3x3 unsharp kernel.
Does Sharpen Image upload my file or text to Tool-You servers?: No. Sharpen Image runs in this browser tab. Files stay on the device. Limit note: Kernel 1–4. PNG. Borders 1px unchanged. First GIF frame. Max 20 MB.
Should I use Blur Image instead of Sharpen Image?: Use Sharpen Image when you need Apply a 3x3 unsharp kernel. Use Blur Image when you need Soften an image. They share a category (Images) but not the same job.
What are the limits of Sharpen Image?: Kernel 1–4. PNG. Borders 1px unchanged. First GIF frame. Max 20 MB. Also: Convolves RGB with a 1–4 strength kernel. Unlike Blur this adds edge contrast. Unlike Contrast this is local, not a global pivot. PNG out. First GIF frame only. One-pixel borders stay.