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Bitmap Sharpener

World's simplest bitmap tool
This is a free and fast online utility that sharpens BMP (bitmap) images. You can use the configuration options below to sharpen the full image or focus the effect on a custom rectangular or oval selection. Extra options allow you to set the sharpening strength, apply the effect outside the chosen area, and fine-tune the selection's position, size, and rotation. Created by graphics designers from team Browserling.
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Click here to select an image from your device, press Ctrl+V to use an image from your clipboard, drag and drop a file from desktop, or load an image from any example below.
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Sharpen Selection Shape
Apply sharpening within a rectangle-shaped selection.
Apply sharpening within an ellipse-shaped selection.
Keep the selected area unchanged and sharpen the outside region.
Sharpen Strength
How strongly to sharpen the selected bitmap pixels.
Try smaller values for a natural result and larger values for extra crisp pixels.
Placement and Size
Horizontal start position.
Vertical start position.
Sharpening area width.
Sharpening area height.
Empty fields expand the sharpening area across the entire bitmap.
Sharpen Selection Angle
Set the rotation angle for the sharpening selection.

What is a Bitmap Sharpener?

learn more about this tool
This free online browser-based program makes BMP (bitmap) images look sharper, clearer, and more defined. It processes the selected bitmap pixels to bring out fine details such as lettering, fabric texture, small patterns, and slightly soft photo features. You can apply sharpening to the entire BMP or limit the effect to a custom part of the image. The sharpening area can be rectangular or oval, and it can be moved, resized, and rotated with the mouse in the input preview. For exact placement, use the left, top, width, height, and rotation options. Leaving all area fields empty sharpens the whole bitmap, while leaving some position or size fields empty lets the area naturally expand across the available image space. If the selected area should stay unchanged and everything around it should become sharper instead, enable the invert option. The strength setting controls how intense the sharpening effect is: small values add a light crispness, and stronger values create a more pronounced, extra-sharp bitmap look. The output stays in BMP format and can be saved as a sharpened bitmap file. Bmp-abulous!

Bitmap Sharpener examples

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Sharpen a Coca-Cola Bottle Cap
In this example, we place a circular sharpening area over a Coca-Cola bottle cap and increase the sharpness to 100%. This makes the cap much clearer as the main focus of the bitmap: the water droplets gain a crisp, bead-like structure, the red metal edge becomes better defined, and the white logo stands out more cleanly against the glossy surface. (Source: Pexels.)
In this example, we place a circular sharpening area over a Coca-Cola bottle cap and increase the sharpness to 100%. This makes the cap much clearer as the main focus of the bitmap: the water droplets gain a crisp, bead-like structure, the red metal edge becomes better defined, and the white logo stands out more cleanly against the glossy surface. (Source: Pexels.)
In this example, we place a circular sharpening area over a Coca-Cola bottle cap and increase the sharpness to 100%. This makes the cap much clearer as the main focus of the bitmap: the water droplets gain a crisp, bead-like structure, the red metal edge becomes better defined, and the white logo stands out more cleanly against the glossy surface. (Source: Pexels.)
Required options
These options will be used automatically if you select this example.
Apply sharpening within an ellipse-shaped selection.
Keep the selected area unchanged and sharpen the outside region.
How strongly to sharpen the selected bitmap pixels.
Horizontal start position.
Vertical start position.
Sharpening area width.
Sharpening area height.
Set the rotation angle for the sharpening selection.
Sharpen the Right Half of Lettuce Leaves
In this example, we sharpen only the right half of a bitmap photo of green lettuce leaves. To do this, we start the sharpening region at the center of the image, at position 200, 0, and leave the width and height fields empty, letting the program automatically extend the effect area to the right and bottom edges. We use a high sharpness value of 130%, which makes the leaf veins and fine fibers much more pronounced, while the left half remains unchanged for an easy side-by-side comparison. (Source: Pexels.)
In this example, we sharpen only the right half of a bitmap photo of green lettuce leaves. To do this, we start the sharpening region at the center of the image, at position 200, 0, and leave the width and height fields empty, letting the program automatically extend the effect area to the right and bottom edges. We use a high sharpness value of 130%, which makes the leaf veins and fine fibers much more pronounced, while the left half remains unchanged for an easy side-by-side comparison. (Source: Pexels.)
In this example, we sharpen only the right half of a bitmap photo of green lettuce leaves. To do this, we start the sharpening region at the center of the image, at position 200, 0, and leave the width and height fields empty, letting the program automatically extend the effect area to the right and bottom edges. We use a high sharpness value of 130%, which makes the leaf veins and fine fibers much more pronounced, while the left half remains unchanged for an easy side-by-side comparison. (Source: Pexels.)
Required options
These options will be used automatically if you select this example.
Apply sharpening within a rectangle-shaped selection.
Keep the selected area unchanged and sharpen the outside region.
How strongly to sharpen the selected bitmap pixels.
Horizontal start position.
Vertical start position.
Sharpening area width.
Sharpening area height.
Set the rotation angle for the sharpening selection.
Sharpen Berry Trays Around One Selection
In this example, we use inverted sharpening on a bitmap with trays of raspberries and blackberries. We select one rectangular blackberry tray, rotate the selected area by 16 degrees counterclockwise to match the tray's angle, and then sharpen everything around that selected tray. As a result, the other raspberry and blackberry trays become clearer while the chosen tray stays unchanged. We use a mild 60% sharpness setting to gently emphasize the natural berry details. (Source: Pexels.)
In this example, we use inverted sharpening on a bitmap with trays of raspberries and blackberries. We select one rectangular blackberry tray, rotate the selected area by 16 degrees counterclockwise to match the tray's angle, and then sharpen everything around that selected tray. As a result, the other raspberry and blackberry trays become clearer while the chosen tray stays unchanged. We use a mild 60% sharpness setting to gently emphasize the natural berry details. (Source: Pexels.)
In this example, we use inverted sharpening on a bitmap with trays of raspberries and blackberries. We select one rectangular blackberry tray, rotate the selected area by 16 degrees counterclockwise to match the tray's angle, and then sharpen everything around that selected tray. As a result, the other raspberry and blackberry trays become clearer while the chosen tray stays unchanged. We use a mild 60% sharpness setting to gently emphasize the natural berry details. (Source: Pexels.)
Required options
These options will be used automatically if you select this example.
Apply sharpening within a rectangle-shaped selection.
Keep the selected area unchanged and sharpen the outside region.
How strongly to sharpen the selected bitmap pixels.
Horizontal start position.
Vertical start position.
Sharpening area width.
Sharpening area height.
Set the rotation angle for the sharpening selection.
All bitmap tools
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Base-64 Encode a Bitmap
Quickly convert a BMP file to the base-64 encoding.
Base-64 Decode a Bitmap
Quickly convert base-64 encoding to a BMP file.
Create a Transparent Bitmap
Quickly convert an opaque bitmap to a transparent bitmap.
Change Bitmap Colors
Quickly substitute one color for another in a bitmap.
Convert a Bitmap to Grayscale
Quickly turn a color bitmap into a grayscale bitmap.
Blur a Bitmap
Quickly blur an area of a bitmap.
Sharpen a Bitmap
Quickly sharpen an area of a bitmap.
Pixelate a Bitmap
Quickly pixelate an area of a bitmap.
Draw a Random Bitmap
Quickly create a bitmap file from random colorful pixels.
Resize a Bitmap
Quickly change the width/height of a bitmap.
Animate Bitmap Sprites
Quickly animate a bitmap sprite sheet.
Coming soon These bitmap tools are on the way
Edit and Draw Bitmaps
Create and edit bitmaps in your browser.
Compress a Bitmap
Make a bitmap smaller in size.
Uncompress a Bitmap
Convert a compressed bitmap to a raw RGB pixel bitmap.
Convert RGB Bitmap to BGR Bitmap
Convert BMP colors in RGB order to BGR order
Convert BGR Bitmap to RGB Bitmap
Convert BMP colors in BGR order to RGB order
Change Bitmap Depth
Change the number of bits per pixel of a bitmap.
Swirl a Bitmap
Create a swirl of any radius in a bitmap.
Make Bitmap Black and White
Reduce all bitmap colors to just black and white.
Merge Bitmaps
Join two or more bitmaps together.
Overlay Bitmaps
Place two or more bitmaps on top of each other.
Split a Bitmap
Split a bitmap into multiple independent bitmaps.
Extract a Bitmap Fragment
Extract one or more selected areas from a bitmap.
Duplicate a Bitmap
Make copies of bitmaps and paste them together.
Rotate a Bitmap
Rotate a bitmap by any angle.
Crop a Bitmap
Select a region from a bitmap.
Skew a Bitmap
Skew a bitmap by an arbitrary angle.
Shift a Bitmap
Shift a bitmap to the left or right.
Add a Border to a Bitmap
Add a border around or inside of a bitmap.
Remove a Border from a Bitmap
Delete a border that surrounds a bitmap.
Flip a Bitmap Vertically
Turn a bitmap upside-down.
Flip a Bitmap Horizontally
Make a mirror copy of a bitmap.
Extract Bitmap Color Palette
Find all colors in a bitmap and extract them.
Convert Bitmap to Byte Array
Create a byte array from a BMP image.
Convert Byte Array to Bitmap
Create a BMP from a byte array.
Convert Bitmap to Webp
Convert a BMP to a Webp.
Convert Webp to Bitmap
Convert a Webp to a BMP.
Convert Bitmap to PNG
Convert a BMP to a PNG.
Convert PNG to Bitmap
Convert a PNG to a BMP
Convert Bitmap to JPEG
Convert a BMP to a JPG.
Convert JPEG to Bitmap
Convert a JPG to a BMP.
Convert Bitmap to BPG
Convert a BMP to a BPG.
Convert BPG to Bitmap
Convert a BPG to a BMP.
Convert GIF to Bitmap
Save GIF frames as BMP images.
Convert BMP to GIF
Convert a bitmap to a single-frame GIF.
Convert Bitmap to Data URI
Create a Data URL scheme of a bitmap.
Convert Data URI to Bitmap
Convert a Data URL scheme back to a bitmap image.
BitBlt Bitmaps
Bit Blit two or more BMPs.
Replace Bitmap Color Index
Put a new color table in a BMP.
Print Bitmap Color Index
Extract the color table of a BMP.
Print Raw Bitmap Pixels
Extract raw RGB pixels from a BMP and print them out as text.
Convert Raw RGB to BMP
Create a bitmap image from raw RGB pixels.
Randomize Bitmap Color Index
Randomly rearrange colors in the BMP color table.
Optimize a Bitmap
Reduce a BMP's memory footprint.
Destroy a BMP
Destroy parts of a bitmap and make it glitchy.
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@browserling
We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling our mission is to make developers' lives easier, so we created this collection of online bitmap tools. Unlike many other tools, we made our tools free, without ads, and with the simplest possible user interface. Our online bitmap tools are actually powered by our programming tools that we created over the last couple of years. Check them out!
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