World's simplest browser-based Portable Network Graphics (PNG) unique color pixel mask generator. Just import your PNG image into the editor on the left, and you will instantly get a mask that marks pixels that appear only once or very few times on the right. In the options, you can define rarity criteria, choose visualization modes (dual-color or selective highlight), customize mask colors, retain original transparency values, and review detailed pixel frequency statistics. Free, quick, and very powerful. Created with love by team Browserling.
World's simplest browser-based Portable Network Graphics (PNG) unique color pixel mask generator. Just import your PNG image into the editor on the left, and you will instantly get a mask that marks pixels that appear only once or very few times on the right. In the options, you can define rarity criteria, choose visualization modes (dual-color or selective highlight), customize mask colors, retain original transparency values, and review detailed pixel frequency statistics. Free, quick, and very powerful. Created with love by team Browserling.

This browser-based utility generates a mask that shows where unique or rare pixels are located in a PNG image. Unique pixels are colors that appear exactly once in the entire image. Rare pixels are colors that occur very infrequently. These pixels often appear in image noise, anti-aliasing remnants, compression artifacts, or hidden watermarks. Identifying them is useful for detecting anomalies, cleaning up graphics, or uncovering hidden data in digital art. In the tool options, you can choose the criteria for defining unique pixels. You can detect strictly unique pixels that appear exactly once in the PNG. Alternatively, you can detect rare pixels that occur less than or equal to a specified number of times, or pixels whose proportion relative to the total number of pixels in the image is less than or equal to a specified percentage. The tool provides multiple visualization modes for displaying unique and rare pixels. By default, it generates a two-color mask where one color represents unique/rare pixels and another color represents all other pixels. It can also generate a mask that applies a single color to a specific category of pixels. For example, it can highlight only unique pixels with a chosen color, leaving all other pixels unchanged, or, conversely, highlight all non-unique pixels with a selected color while keeping unique/rare pixels unchanged. In the option, you can select the mask color for both unique and non-unique pixels. By using the preserve transparency option, you can maintain the original alpha (transparency) values of the input pixels in the generated mask, ensuring that the mask closely matches the original image's transparency structure. The tool also provides statistical pixel analysis, including the exact counts of unique/rare and non-unique pixels, and the percentage distributions for both groups. Png-abulous!
This browser-based utility generates a mask that shows where unique or rare pixels are located in a PNG image. Unique pixels are colors that appear exactly once in the entire image. Rare pixels are colors that occur very infrequently. These pixels often appear in image noise, anti-aliasing remnants, compression artifacts, or hidden watermarks. Identifying them is useful for detecting anomalies, cleaning up graphics, or uncovering hidden data in digital art. In the tool options, you can choose the criteria for defining unique pixels. You can detect strictly unique pixels that appear exactly once in the PNG. Alternatively, you can detect rare pixels that occur less than or equal to a specified number of times, or pixels whose proportion relative to the total number of pixels in the image is less than or equal to a specified percentage. The tool provides multiple visualization modes for displaying unique and rare pixels. By default, it generates a two-color mask where one color represents unique/rare pixels and another color represents all other pixels. It can also generate a mask that applies a single color to a specific category of pixels. For example, it can highlight only unique pixels with a chosen color, leaving all other pixels unchanged, or, conversely, highlight all non-unique pixels with a selected color while keeping unique/rare pixels unchanged. In the option, you can select the mask color for both unique and non-unique pixels. By using the preserve transparency option, you can maintain the original alpha (transparency) values of the input pixels in the generated mask, ensuring that the mask closely matches the original image's transparency structure. The tool also provides statistical pixel analysis, including the exact counts of unique/rare and non-unique pixels, and the percentage distributions for both groups. Png-abulous!
In this example, we analyze a PNG image of a pink flower in a green pot to determine whether it contains pixels that appear exactly once. We enable the dual-color mask and mark every color that appears exactly once in black, while setting all common and transparent pixels to white (transparency preservation is disabled). The result reveals more than 16,500 unique pixels, primarily concentrated along the edges between the flower, the pot, and transparent areas, where sharp alpha transitions create one-time pixel values. (Source: Pexels.)
In this example, we check the quality of a Zoom logo PNG by finding rare pixels. We set the tool to "Find Rare Pixels (Count)" with a threshold of 5, so it highlights all pixels that appear five times or fewer in bright red. All other pixels stay in their original colors. The resulting mask shows many red spots in areas that should be solid blue, revealing small color artifacts likely caused by saving or converting the image from JPEG format. (Source: Wikipedia.)
In this example, we generate a frequency-based mask of a kitten photo to identify colors that account for only 0.001% of the total image. We fill the common pixel areas with a seashell color and leave the rarest pixels in their original state. This process reveals a hidden watermark left by the photographer – a line of text reading "© 2026 Jane Finch Photography" that was previously invisible to the naked eye. (Source: Pexels.)
Edit a PNG in your browser.
Compare two or more PNG images.
Convert a PNG image to an AV1 image (AVIF).
Convert an AV1 image (AVIF) to a PNG image.
Convert a PNG image to a High Efficiency Image File (HEIF).
Convert a Hide Efficiency Image File (HEIF) to a PNG image.
Convert a PNG image to an ICO icon.
Convert a PNG image to a TIFF image.
Convert a TIFF image to a PNG image.
Convert a PNG image to a PIK image.
Convert a PIK image to a PNG image.
Convert a PNG image to a PPM image.
Convert a PPM image to a PNG image.
Convert a PNG image to a BPG image.
Convert a BPG image to a PNG image.
Convert a PNG image to a FLIF image.
Convert a FLIF image to a PNG image.
Convert a PNG image to a Paint.net file.
Convert a Paint.net file to a PNG image.
Convert a PNG image to a Photoshop file.
Convert a Photoshop file to a PNG image.
Convert a PNG image to an SVG image.
Convert a PNG image to an PDF document.
Convert a PDF document to a PNG image (or multiple images).
Convert a PNG image to an EPS file.
Convert an EPS file to a PNG image (or multiple images).
Convert a PNG image to a JFIF image.
Convert a JFIF image to a PNG image.
Convert a PNG image to raw RGB values.
Convert RGB values to a PNG image.
Convert a PNG image to raw BGR values.
Convert BGR values to a PNG image.
Convert a PNG image to raw RGBA values.
Convert RGBA values to a PNG image.
Convert a PNG image to raw BGRA values.
Convert BGRA values to a PNG image.
Convert multiple PNGs to a GIF animation.
Convert an APNG animation to a GIF image.
Convert a GIF animation to an APNG image.
Convert an APNG image to a Webp image.
Convert a Webp image to an APNG image.
Convert an APNG image to an MP4 video.
Convert an MP4 video to an APNG image.
Convert an APNG image to an AVI video.
Convert an AVI video to an APNG image.
Convert an APNG image to a WMV video.
Convert an WMV video to an APNG image.
Extract all frames from an APNG image.
Play a PNG animation (APNG) frame by frame.
Change the playback speed of an animated PNG (APNG).
Change how many times an animated PNG loops.
Reverse the order of frames in an animated PNG (APNG).
Created animated PNGs (APNGs) from input images.
Check if the given PNG file is an animated PNG file (APNG).
Create a sprite sheet from all animated PNG (APNG) frames.
Create an animated PNG (APNG) from a sprite sheet.
Create Excel art from a PNG image.
Randomly distort data in a PNG file to make a glitched PNG.
Invert the alpha channel values in a PNG.
Break a PNG image into multiple pieces.
Generate a slideshow animation from multiple PNGs.
Generate a mosaic wall from multiple PNGs.
Convert a PNG into a hexagonal grid of pixels.
Convert a PNG into a triangular grid of pixels.
Create a Voronoi diagram from a PNG image.
Darken PNG corners compared to its center.
Create multiple reflections of a PNG.
Apply a Bayer filter on a PNG.
Make a PNG look like it was taken via night vision goggles.
Make a PNG look like it's spherical.
Run a PNG through the Mobius Transform.
Convert between RGB, CMYK, HSV, and HSL color spaces.
Convert between 8-bit, 16-bit, 24-bit, and 32-bit PNG depths.
Remove dithering from a PNG image.
Convert a PNG to an ASCII art image.
Convert ASCII art to a PNG image.
Convert a PNG to an ANSI art image.
Convert ANSI art to a PNG image.
Convert a PNG to a Braille art image.
Convert Braille art to a PNG image.
Create a PNG image from the given bytes.
Convert a PNG image to bytes.
Increase the quality of a PNG image.
Extract a 2d slice from a PNG.
Create a PNG that contains all possible RGB colors.
Find all textual information in a PNG image and extract it.
Given any 2D PNG, add 3rd dimension to it.
Quickly erase text (labels, captions) from a PNG.
Quickly delete a watermark from a PNG.
Salvage a PNG that has bad bytes in it and doesn't open.
Conceal a secret message in a PNG image.
Update meta data of a PNG file.
Delete meta data from a PNG picture.
Check if the given file is a valid PNG without errors.
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We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling we love to make people's lives easier, so we created this collection of online PNG tools. We created the simplest possible user interface for our tools and they are now used by millions of users every month. Behind the scenes, our online PNG tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!







