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screenshotPNG Optimizer | Download Optimize PNG images and reduce file size right in your browser!

Some of the important features about PNG Optimizer addon are listed below. This is followed by an overview about this addon. This summary contains few words about the addon, its function and features. Next is FAQ, this section is useful to get information about how this addon works in your browser. If you couldn’t find a specific answer, please fill the bug report form in this page or the contact form in the homepage to let us know about your question. Following the FAQ, is the bug report form. It is designed to collect user feedbacks and bugs about this addon. Users can suggest improvements or feature requests through this form too. Next section is for submitting comments about this addon which uses facebook comments plugin. The last section is dedicated to reports submitted through the GitHub website. We hope the information provided in this page, could help you get all the basics you need about this addon and enable you to have a better experience with PNG Optimizer.

PNG Optimizer is a browser extension that let you easily optimize PNG images in your browser (in a stand-alone popup). Please check the YouTube Tutorial at the bottom of this page to get an idea of how this Addon works in your browser. If you want to contribute to the developement of this Addon, please Fork it on GitHub, and push your changes to a named branch. Moreover, you can review all the comments made on GitHub commits.

4 Reasons to Use PNG Optimizer

  • Has a stand-alone popup window to drag and drop PNG images.

  • Has a console to inform you about ongoing processes.

  • Can optimize and also reduce PNG file size for up to 50 percent.

  • Available for Firefox, Chrome and Opera browsers on all operating systems.

Frequently Asked Questions

  • 1. What is PNG Optimizer?

    PNG Optimizer is a browser add-on that helps you optimize PNG images. It also reduces the file size depending on the optimization level. Simply drag and drop PNG file(s) to a designated area in the app UI and then wait for few seconds for the optimization process to finish up. You can select an optimization engine from the drop-down list. There are five optimization engines available to choose from. All the info about the optimization process is being displayed in the console area within the app UI. Once the optimization process is done, please click on the download icon next to each optimized image item to download the optimized file. Please note that download location is the default location in your browser.

  • 2. How can I work with this add-on?

    To work with this addon, as mentioned above, just drag and drop a PNG file or multiple files in the - file I/O box - within the app UI (top section). Then, wait for few seconds for the optimization process and finally download your optimized file from the bottom result section. Once an optimization process is finished, you can start a new one. Moreover, you can terminate an optimization process by pressing on the reload button at the top right corner in the app UI. It is important to note that, this add-on can reduce the file size for PNG images for up to 50%, but this number may vary for each image depending on its internal structure. There are five optimization engines embedded in the app. The first and last engines can optimize JPEG & PNG files and the rest can optimize PNG files only. Please note that depending on the optimization engine you choose, the result will be different in terms of quality and final size. Therefore, please select the one that best matches your need.

  • 3. How does PNG optimizer addon work?

    As mentioned above, this addon uses five different optimization engines. Please read the following to get more info about each engine. (1) The first engine is called compressor, it uses the open-source JavaScript compressor.js project to optimize image files. It can optimize PNG and JPEG files and uses the HTML5 canvas element to perform this task. (2) Second engine is called Opti PNG, it is a free and open-source tool for optimizing PNG files and is written in C language. Recently, it is compiled to JavaScript language using emscripten compiler. This addon is using optipng.js JavaScript API to optimize png images. (3) The third engine is called PNG Guant, it is a free and open-source tool for optimizing PNG files and is written in C language. Recently, it is compiled to JavaScript language using emscripten compiler. This addon is using pngquant.js JavaScript API to optimize png images. (4) Forth engine is called PNG Crush, it is a free and open-source tool for optimizing PNG files and is written in C language. Recently, it is compiled to JavaScript language using emscripten compiler. This addon is using pngcrush.js JavaScript API to optimize png images. (5) The last engine is called Browser Image Optimization, it uses the open-source JavaScript browser-image-compression.js project to optimize image files. It can optimize PNG and JPEG files and uses the HTML5 canvas element to perform this task. Please note that, because this is an ongoing project, you might see some bugs in optimizing image files. Please fill the bug report form in this page, if you found a bug or have a feature request.

  • 4. How do I turn the extension OFF?

    When app UI is closed, this addon is completely OFF and has no usage (RAM/CPU) on your system at all. Alternatively, if you want to completely turn off the addon, please head to the extensions tab in your browser and then click on the disable button from there.

  • 5. Is this extension available for mobile firefox (Firefox for android)?

    Yes, this addon is available for all browsers and platforms including mobile Firefox and Opera browsers.

  • 6. How can I reload the app UI?

    When you open the app UI, you will see a reload button on the top left corner. Please press on this button to reload the UI. Also note that, reloading the UI will terminate all active operations and reset the optimization process.

  • 7. How can I download the optimized image?

    As mentioned above, once the optimization process is done, the optimized image will be rendered in the top right rectangular area. Simply click on the - download button - in order to download the optimized image. Please note that, the image will be downloaded to the default download location in your machine.

  • 8. How can I change the download location for the optimized image?

    To change the download location, please head to the settings tab in your browser and then find the download section. Within this section, you can adjust the download path. This will globally change the download location for all you downloads in your browser.

  • 9. Can I also optimize other formats for image files (i.e. jpeg)?

    No, unfortunately this addon is only designed for PNG file formats. In future, support for other file formats will be added.

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    Submitting Bugs

    Your feedback goes a long way towards making this addon even better. With this Bug report form, you can submit bugs or suggest enhancements for the functionality or performance of this addon. Please note, this bug report form will be sent to the developer(s) of this addon. You will not get an immediate or personal response at the moment. However, the developer(s) may contact you through the email address provided in this form for further clarifications or requesting additional information regarding the reported bug(s).

    Please enter the name of the extension (addon).

    Please enter the current version of the extension.

    Please be as specific as possible. Basically, describe what happened, what you were doing when it happened, and why you think it is a problem.

    Describe the step-by-step process required to reproduce the issue you are reporting. Be specific when describing these steps by providing as much detail as possible.

    Please try to leave a link to a screenshot for the specific bug or error report.

    Please enter your operating system.

    Please enter your browser and its current vesrion.

    Please enter your email address.

    Comments | Reviews

    • Please note: keep these reviews clean, and avoid the usage of derogatory or inappropriate language or terminology in references to individuals or groups based on race, national or ethnic origin, color, religion, age, gender, etc. Do not submit bugs in your reviews, use the above bug-report section instead. Also, never post any personal information in these reviews.

    GitHub Reports | Fork me on GitHub

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