This online utility lets you generate an alpha mask that shows opaque and transparent areas in the GIF. You can choose colors for transparent and opaque pixels, control the animation speed, view an animated alpha mask for all frames, or pause on a single frame to see its mask. The tool also shows a transparency status badge and provides per-frame alpha analysis. Created by GIF experts from team Browserling.
This online utility lets you generate an alpha mask that shows opaque and transparent areas in the GIF. You can choose colors for transparent and opaque pixels, control the animation speed, view an animated alpha mask for all frames, or pause on a single frame to see its mask. The tool also shows a transparency status badge and provides per-frame alpha analysis. Created by GIF experts from team Browserling.
This browser-based program lets you generate an alpha mask for animated or static GIF files. It converts transparency information into a clear visual mask, making transparent and opaque pixels easy to see and analyze. You can view the mask for the entire GIF animation frame by frame, or stop at a single frame and generate the alpha mask only for that frame. In the options, you can choose how to play the GIF and how to generate the mask. When playing the GIF at its original speed, the input preview shows the animation exactly as it was created, using the original frame delays stored in the file, while the output preview displays a synchronized alpha mask for each frame. When using a custom speed, the animation is played with a fixed delay that you select, which is useful for slowing down fast GIFs to inspect transparency frame by frame. If you switch to single‑frame mode, both previews freeze on the chosen frame, and the output shows a static alpha mask for that specific frame. Mask colors are fully customizable. You can select one color for transparent areas and another for opaque areas. The tool also analyzes the GIF and displays detailed transparency information. It reports whether the GIF is fully opaque, fully transparent, or a mix of both, and shows this result as a clear status badge. In addition, it lists which frames contain transparency, which frames are fully transparent, and which are fully opaque. During playback (or when a single frame is selected), the tool shows statistics for each frame, such as the number of transparent and opaque pixels, along with overall GIF data like total frame count, current frame index, active frame delay, and frame dimensions. An important detail is that GIF files do not support partial transparency. Unlike PNG images, where pixels can have any alpha value between 0 and 1, a GIF frame can only mark pixels as fully transparent or fully opaque. Because of this limitation, the alpha mask generated by this tool is strictly binary. Gifabulous!
This browser-based program lets you generate an alpha mask for animated or static GIF files. It converts transparency information into a clear visual mask, making transparent and opaque pixels easy to see and analyze. You can view the mask for the entire GIF animation frame by frame, or stop at a single frame and generate the alpha mask only for that frame. In the options, you can choose how to play the GIF and how to generate the mask. When playing the GIF at its original speed, the input preview shows the animation exactly as it was created, using the original frame delays stored in the file, while the output preview displays a synchronized alpha mask for each frame. When using a custom speed, the animation is played with a fixed delay that you select, which is useful for slowing down fast GIFs to inspect transparency frame by frame. If you switch to single‑frame mode, both previews freeze on the chosen frame, and the output shows a static alpha mask for that specific frame. Mask colors are fully customizable. You can select one color for transparent areas and another for opaque areas. The tool also analyzes the GIF and displays detailed transparency information. It reports whether the GIF is fully opaque, fully transparent, or a mix of both, and shows this result as a clear status badge. In addition, it lists which frames contain transparency, which frames are fully transparent, and which are fully opaque. During playback (or when a single frame is selected), the tool shows statistics for each frame, such as the number of transparent and opaque pixels, along with overall GIF data like total frame count, current frame index, active frame delay, and frame dimensions. An important detail is that GIF files do not support partial transparency. Unlike PNG images, where pixels can have any alpha value between 0 and 1, a GIF frame can only mark pixels as fully transparent or fully opaque. Because of this limitation, the alpha mask generated by this tool is strictly binary. Gifabulous!
In this example, we generate an alpha mask for an animated GIF and play it at a custom speed to make the transparency easier to inspect. We set the frame delay to 500 milliseconds, so each frame stays visible for half a second. Transparent pixels are displayed in black, while opaque pixels are shown in white. The resulting mask confirms that the GIF contains transparency, specifically noting that the first (1st) and the last (29th) frames are fully transparent, while the frames in between contain a mix of transparent and opaque pixels. (Source: Pexels.)
This example shows how we use the tool to confirm that a GIF does not contain any transparency. We load a 9-frame animation of a jewel beetle and play it at its original speed, preserving the original frame delays. The alpha mask uses black for transparent pixels and light green for opaque pixels. The resulting mask animation shows only opaque pixels, and the status badge confirms that the GIF is fully opaque across all frames. (Source: Pexels.)
In this example, we load an animated sprite of Caroline (nicknamed Mechageek) from Metal Slug Attack. We pause the GIF animation and select frame number 4 to generate a static alpha mask for that frame only. We use DodgerBlue for transparent areas and MediumVioletRed for opaque areas. The per-frame analysis shows that this frame contains 17,386 transparent pixels and 8,514 opaque pixels within a frame size of 140 by 185 pixels. (Source: SNK.)
Create animated GIFs in your browser.
Change the order of frames in a GIF animation.
Insert one or more frames in a GIF animation.
Decrease the size of a GIF.
Add an audio track to a GIF.
Draw a GIF on different backgrounds to see how it looks.
Gradually fade-out the frames of a GIF.
Gradually fade-in the frames of a GIF.
Cross-fade a GIF frame by frame.
Cross-fade two GIF animations.
Smoothly transform one GIF into another GIF.
Change the delay between all GIF frames to the same value.
Change the framerate of a GIF.
Change the quality of a GIF.
Increase the width and height of a GIF.
Decrease the width and height of a GIF.
Create a chess game animation from a PGN file.
Create a go game animation from a SGF file.
Create a draughts/checkers game animation from a PDN file.
Generate a GIF animation of winning a Solitaire game.
Create a GIF animation of Game of Life.
Base64-encode a GIF.
Base64-decode a GIF.
Base58-encode a GIF.
Base58-decode a GIF.
Convert a sequential GIF to progressive GIF.
Convert a progressive GIF to a sequential GIF.
Convert an animated PNG to an animated GIF.
Convert an animated GIF to an animated PNG.
Convert an animated PNG to an animated GIF.
Convert a GIF animation to an AV1 animation (AVIF).
Convert an AV1 animation (AVIF) to a GIF animation.
Convert a GIF animation to a HEIF animation.
Convert a HEIF animation to a GIF animation.
Export a GIF animation to a BPG animation.
Convert an animated BPG to an animated GIF.
Convert a GIF animation to an AVI video.
Convert an AVI video to a GIF animation.
Convert a GIF animation to a WMV video.
Convert a WMV video to a GIF animation.
Convert a GIF animation to an MP4 video.
Convert an MP4 video to a GIF animation.
Convert a GIF animation to an MKV video.
Convert an MKV video to a GIF animation.
Convert a GIF animation to a MOV video.
Convert a MOV video to a GIF animation.
Convert a GIF animation to GIF video (GIFV).
Convert a GIF video (GIFV) to a GIF animation.
Create a Data URI from a GIF animation.
Reconstruct a GIF from a Data URI.
Draw one or more GIF frames as ASCII art.
Create an animation from multiple ASCII art drawings.
Draw one or more GIF frames as ANSI art.
Create an animation from multiple ANSI art drawings.
Draw one or more GIF frames using Unicode glyphs.
Create a GIF from multiple Unicode drawings.
Draw one or more GIF frames using Braille characters.
Create a GIF animation from Braille characters.
Replace one color in a GIF with another.
Convert all colors in a GIF to just two black and white.
Find the color palette used in a GIF.
Find the color index used in a GIF.
Randomly change the color indexes of a GIF.
Remove colors from a GIF.
Run various color quantization algorithms on a GIF.
Create a GIF with more than 256 colors.
Convert a 256-color GIF to a 2-color GIF.
Convert a non-dithered GIF to a dithered GIF.
Merge dithered pixels and create a non-dithered GIF.
Change the delay interval between individual GIF frames.
Split a GIF into two or more GIFs.
Join two or more GIFs into a single GIF.
Shift GIF frames to the right or to the left.
Hide the selected area in a GIF by drawing a block over it.
Extract a part (a range of frames) from a GIF.
Create multiple GIF copies side-by-side.
Create multiple copies of individual GIF frames.
Skew a GIF animation by an angle.
Reverse a skew in a GIF animation.
Create a pixel whirl of any radius in a GIF.
Create a GIF that animates white noise.
Make a GIF animation go so slow that it appears almost static.
Generate a GIF that contains a scrolling marquee.
Add a semi-transparent watermark to a GIF animation.
Remove a watermark from a GIF animation.
Extract all GIF frames in a folder and zip it up.
Add a hidden comment in GIF's metainfo section.
Clear all metainfo from a GIF.
Animate multiple GIFs at the same time side-by-side.
Add an animation effect to a message.
Layer two GIFs and put one GIF on top of another GIF.
Overlay an animated GIF on any image or photo.
Overlay any image or photo on an animated GIF.
Quickly check if a GIF file is animated or static.
Quickly change the playback length of a GIF.
Convert any image to a GIF that emulates slow Internet speed.
Create a GIF animation of a loading spinner.
Let Zalgo destroy a GIF animation.
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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 peoples' lives easier, so we created this collection of online GIF tools. Our tools are enjoyed by millions of casual users every month as our easy-to-use user interface doesn't require advanced computer skills. Behind the scenes, our GIF tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!
