Image Sharpener
Sharpen soft or blurry photos online — adjust strength and download, no upload.
Examples
Sharpen a soft photo
Input
Slightly blurry portrait JPEG
Output
Crisper edges and finer detail at strength 50
Enhance a scanned document
Input
Scanned text PNG that looks fuzzy
Output
Sharper text at strength 70 — easier to read
About this tool
This free online image sharpener uses a convolution kernel to enhance edges and fine detail in photos — processed entirely in your browser, no upload needed. Adjust the strength slider and hit Apply to see the effect. The output keeps your original format (JPEG stays JPEG, PNG stays PNG) and shows the file size so you can decide before downloading.
How to use
- Drop a JPG, PNG, or WebP image into the upload zone.
- Drag the Strength slider to set how much sharpening to apply.
- Click Apply to process the image.
- Preview the result and check the output file size.
- Click Download to save the sharpened image.
Frequently asked questions
How does the online image sharpener work?
It applies a convolution sharpen kernel to the image pixel data using the Canvas API. The kernel blends between an identity (no change) and a full sharpen matrix based on the strength you choose, enhancing edges and fine detail.
Is the image sharpener free and private?
Yes — it is completely free, with no sign-up required. Sharpening happens entirely in your browser; your photo is never uploaded to any server.
What strength should I use?
For subtle enhancement, try 30–50. For visibly crisper detail, use 60–80. Very high values (90–100) can introduce halos around edges — useful for artistic looks but may not suit photos.
Which image formats are supported?
You can drop in JPG, PNG, and WebP images. The output keeps the same format as the input — JPEG for JPG files, PNG for everything else.
Will sharpening increase the file size?
Slightly, because sharp edges are harder to compress. The tool shows the output file size so you can compare before downloading.
Can I sharpen a blurry photo to recover lost detail?
Sharpening enhances contrast at edges, which makes an image look crisper, but it cannot recover detail that was never captured. For best results, use on photos that are only slightly soft.
Can I sharpen multiple photos at once?
This tool processes one image at a time. Drop a new image in to replace the current one.
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