Uwarp
Input image
Sharpened image

Upload an image and set options below—the sharpened preview appears here.

Sharpen options

Convolution sharpening enhances edge contrast. Choose mask size, then adjust strength— higher values add more punch; start around 40–60 for most photos.

Size of the convolution mask

Strength

Sharpen image online

Sharpen images online with 3×3 or 5×5 convolution masks. Image sharpening for slightly soft photos—strength 0–100, live preview, free PNG download in your browser.

What is image sharpening?

Image sharpening boosts edge contrast with a convolution mask so boundaries look crisper—useful when you want to unblur pics slightly or make a picture clearer before export. Strength controls how much contrast is added at edges; 3×3 vs 5×5 sets how far the filter looks. It is not AI deblurring: heavy motion blur or pixelation need other tools. Upload, adjust, preview, download PNG—all processing runs in your browser.

Common sharpen search intents

Upload above, pick mask size and strength—these queries map to the same sharpening workflow.

  1. Image sharpening: Run image sharpening with a cross convolution mask—choose 3×3 for fine detail or 5×5 for broader clarity on soft photos.
  2. Unblur an image: Unblur an image when blur is mild softness, not motion blur—this tool boosts edge contrast; it does not reconstruct lost detail.
  3. Unblur pics: Unblur pics in one upload: adjust strength until edges look crisper, preview side by side, download PNG.
  4. Clear images: Make clear images from slightly fuzzy shots—product photos, scans, and thumbnails that need a clarity pass before export.
  5. Make picture clearer: Make a picture clearer free in the browser—no install, processing stays on your device until download.
  6. Sharpen image: Sharpen image edges with strength 0–100 and mask size like classic online photo editors.

Sharpen controls

Mask size and strength for image sharpening and clarity.

  1. 3×3 or 5×5 mask: Pick convolution mask size to match fine or broad sharpening.
  2. Strength 0 to 100: Control how strongly edges are enhanced.
  3. Cross convolution: Enhances edges using normalized cross-shaped kernels.
  4. Live preview: Preview updates as you adjust mask and strength.
  5. Side-by-side comparison: Original and sharpened images shown together.
  6. PNG download: Save the result as sharpen-image.png.

How to make a photo more clear

Steps for online image sharpening and mild unblur.

  1. Upload the image: Drop or click in the input panel (15 MB max).
  2. Choose mask size: Use 3×3 for text and fine detail; 5×5 for broader sharpening.
  3. Set strength: Move the slider until edges look crisp without halos.
  4. Download PNG: Save when the preview looks clear enough.

Tips for sharpening

Avoid halos and noise when making images clearer.

  1. Start moderate: Try strength 40–60 before pushing higher values.
  2. Pick mask by subject: 3×3 for text and fine lines; 5×5 for larger objects.
  3. Watch for halos: If bright outlines appear around edges, lower strength.
  4. Noise gets sharper too: Grainy photos may look noisier—denoise first if needed.
  5. Compare at zero: Set strength to 0 to judge how much clarity you added.
  6. Export PNG for logos: Alpha is preserved when sharpening icons or cutouts.

When to sharpen images

Typical uses for making photos and scans clearer.

  1. Soft phone photos: Add clarity to slightly soft mobile camera shots.
  2. Web product images: Make SKU photos look crisper on catalog pages.
  3. Scanned documents: Improve legibility on mildly fuzzy scans and blurry text.
  4. Social thumbnails: Boost edge pop before posting compressed JPEGs.
  5. Screenshot cleanup: Clarify UI captures that look slightly blurred.
  6. Pre-export prep: Sharpen once before uploading to another platform.

Why use this sharpen tool

Benefits of free browser-based image sharpening.

  1. Mask choice: Match sharpening radius to your subject with 3×3 or 5×5.
  2. Private: Images stay on your device—no server upload.
  3. Instant preview: See sharpening strength before download.
  4. Preserves alpha: Transparency on PNG uploads is kept intact.
  5. No install: Works in any modern browser—make pictures clearer without Photoshop.
  6. Free: Unlimited previews and downloads.

Technical details

How convolution sharpening works here.

  1. 3×3 algorithm: Pixastic-style cross kernel: center weight 15, edge weights scale with strength; normalized sum 1.
  2. 5×5 algorithm: Cross kernel at 2-pixel radius with center weight 35—broader neighbor sampling.
  3. Color channels: Sharpen R, G, B independently; alpha unchanged.
  4. Rendering: Canvas 2D getImageData / putImageData.
  5. Input limits: 15 MB; longest edge 8192 px.
  6. Browser support: Chromium, Firefox, Safari with Canvas 2D.

Frequently Asked Questions

Have questions? We have answers.

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