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How to Increase or Decrease WordPress JPEG Image Compression

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How to Increase or Decrease WordPress JPEG Image Compression

One of our users, a photographer, complained that the JPEG image he uploaded were losing a little bit of quality. After doing some research, we found out that it is true that WordPress does automatically compress JPEG images at 90% quality. In this article, we will show you how to increase or decrease WordPress JPEG image compression.

All you need to do is paste the following code in your theme’s functions.php file or your site-specific plugin.

add_filter('jpeg_quality', function($arg){return 100;});

Setting it to 100 would mean that WordPress would compress the image at its highest quality. For most users, this is not an issue. Heck, we never noticed it on our site. But if you are a photographer, then this is noticeable (we suppose).

There are definitely performance benefits to leaving the compression quality as is. If you want, you can change the number from 100 to 80 or something lower to squeeze a few more kBs.

Source: Glyn Mooney

Editorial Staff at WPBeginner is a team of WordPress lovers led by Syed Balkhi. Page maintained by Syed Balkhi.

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  • Adam Freedman

    I’ve tried out this code, but there is no difference in quality between 90-100! To verify, I set the quality down to 20% and the thumbnails became really pixelated and blurry. So how come going from 90 to 100% doesn’t make any difference? I examined them very thoroughly and they look exactly the same….

  • Mattia Frigeri

    I have tried various uploads… It seems to me that WP doesn’t reduce the image, the loaded one and the original one are exactly the same. I have also tried to write in functions.php this:

    add_filter(‘jpeg_quality’, function($arg){return 50;});

    nothing happened when I loaded a new image: same size again.


  • VHamilton

    My site would not open after entering this code. I removed it. There have been other sites that have given “edit code” information that crashed my site. That is frustrating!

  • Michael Bailey

    Thanks for this, just what I needed.


  • Jose Vega

    Hi, i want to know if I can config wordpress to compress all types of images, not only jpeg. is it possible?

  • Matt

    Hi there, i’m using Twitter Bootstrap for WordPress and when I add this code ‘add_filter(‘jpeg_quality’, function($arg){return 100;});’ into the theme it says there’s an error. What could I be doing wrong?

  • Mattia Frigeri

    Works with php 5.3 or newer. For older versions you should use:

    add_filter( ‘jpeg_quality’, create_function( ”, ‘return 100;’ ) );

    as the reference says:

    • Lee Stuttaford

      Hi, just noticed a small issue :

      add_filter( ‘jpeg_quality’, create_function( ”, ‘return 100;’ ) );

      should be :

      add_filter( ‘jpeg_quality’, create_function( ”,‘return 100;’ ) );

      or rather : in beginning of function array, what looks like 2x single > ‘ ” <

      Tricky to spot and will cause your functions file to die …

      • WPBeginner Support

        Please take a look at the article above. The actual line that we recommended is:

        add_filter('jpeg_quality', function($arg){return 100;});

  • Hubert Souchaud Mesmin

    How to change JPEG images quality with different value of % for the different auto-generated image sizes (ex full->90%, thumb->60%)? Thanks!

    • Editorial Staff

      Not sure if that is even possible. Will have to look into the core.

  • siddharth sagar

    its great knowledge concerns…..thanks for it.
    before using this code, i face some problem about the layout of images………
    now its good…