Plugin Directory

Smush – Optimize Images | Compress and Lazy Load Images | Convert WebP

Smush – Optimize Images | Compress and Lazy Load Images | Convert WebP


The #1 Image Optimization Plugin for WordPress

Smush is the leading image optimization plugin – optimize, resize, and compress images, as well as convert images to WebP format for faster loading web pages.

Brought to you by the WPMU DEV team – founded in 2007 and trusted by web professionals from freelancer to agency worldwide ever since.

Whether you spell it ‘optimise’ or ‘optimize’ – with Smush’s image optimizer you can compress images and serve images in next-gen formats (convert to WebP), all without introducing a visible drop in quality.

Award-Winning Image Optimizer

Smush has been benchmarked and tested number one for speed and quality. Beyond that, it’s also the award-winning, back-to-back proven crowd-favorite WordPress image optimizer trusted by over 1M+ worldwide to:

  • Optimize images
  • Compress images
  • Lazy load images
  • Resize images
  • Convert to WebP
  • And more…

Why Use Smush To Optimize Images (The Smush Difference)

Smush was built from the ground up to make it easy for WordPress users to optimize images, activate lazy loading, compress media files, and more – whether they’re just getting started, or a seasoned pro who’s developed thousands of websites.

Improve website performance (along with Google PageSpeed Insights scores) with compressed and optimized images and lazy loading – all while actually delivering a better user experience because the rollout of Core Web Vitals has proven one thing: performance is about far more than just scoring well on performance testing tools. Visitor experience matters.

Discover the features that set Smush apart from other image optimization plugins:

  • Lossless compression (Basic Smush) – Strip unused data and compress images without affecting image quality.
  • Lossy compression (Super Smush) – Optimize images up to 2x more than lossless compression with our cutting-edge, multi-pass lossy image compression.
  • Ultra Smush (Pro Only) – Take performance to the next level with 5x image compressing power! Your images will be as light and fast as possible, while still preserving remarkable image quality.
  • Built-In Lazy Loading – Lazy load images to defer loading of offscreen images with the flip of a switch.
  • Convert to WebP (Pro Only) – Use the Local WebP feature to convert and automatically serve images in the next-gen WebP format.
  • Bulk Smush – Bulk optimize and compress images with one click.
  • Background Optimization (Pro Only) – Smush’s powerful image optimization features will continue to run in the background even when the plugin is closed.
  • Resize Images – Set a max width and height, and large images will scale down as they are being optimized.
  • 123-point global CDN (Pro Only) – Ensure blazing-fast image delivery anywhere in the world. Includes automatic WebP conversion and image resizing, plus, GIF / Rest API support.
  • Incorrect Image Size Detection – Quickly locate images that are slowing down your site.
  • Directory Smush – Optimize images even if they aren’t in the default WordPress media library.
  • Automated Optimization – Asynchronously auto-smush your attachments for super fast compression on upload.
  • No Monthly Limits – Optimize all of your images (up to 5 MB in size) free forever (no daily, monthly, or annual limits).
  • Gutenberg Block Integration – View image compression information directly in image blocks.
  • Multisite Compatible – Flexible global and subsite settings for multisite installations.
  • Optimize All Image Files – Smush supports optimization for all of your PNG and JPEG files.
  • No Performance Impact On Your Server – Image optimization is not run on your website’s server to prevent wasting server resources (that you pay for) and is instead run using the fast, reliable WPMU DEV Smush API.
  • Configs – Set your preferred Smush settings, save them as a config, and instantly upload to any other site.
  • 还有很多,很多,更多!

Learn More With These Hands-On Image Optimization & Performance Tutorials

Local WebP – Serve Images In Next-Gen Formats

With Smush, you can take advantage of next-gen image formats by converting all of your images to WebP. WebP is a file format that enables superior image compression and quality retention. All major performance testing solutions, including Google PageSpeed Insights, assess your site’s ability to serve images in these next-gen formats due to the significant impact on visitor experience.

WebP lossless images are 26% smaller in size compared to PNGs. WebP lossy images are 25-34% smaller than comparable JPG images. More information can be found in this Google developers article.

The best part: Smush’s Local WebP feature makes this incredibly easy to set up with the ability to host all images locally (not requiring the use of a CDN). Our Local WebP feature includes automatically replacing PNG and JPEG images on your website’s frontend to serve WebP images – with the necessary fallbacks for browsers that don’t support WebP yet.

Learn more: How To Convert Images to WebP In WordPress

Note: Yes, Smush supports WebP conversion for all image formats, including JPEG to WebP and PNG to WebP.

With the best image optimization plugin for WordPress – you can finally stop worrying about the performance impact of using the images you want on your website.

Compress Images While Preserving Image Quality

Image compression plugins don’t have to destroy images with a visible, 30% loss in quality. Smush strips hidden information from your images (that can often be bulky), and reduces image file sizes without introducing a visible impact on appearance.

Smush meticulously scans every image you upload – or have already added to your site – cuts all the unnecessary data, and scales it for you before adding it to your media library. And it can serve images in the WebP format.

Compress Images While You Sleep With Background Image Optimization

Have a large number of images to compress? Smush’s powerful optimization features will continue to work their magic in the background, even when you’ve closed the plugin completely. You’ll receive an email when image optimization has been completed – with a full report.

Compress Any Image in Any Directory

As well as smushing your media uploads, you may want to compress the images stored in other folders. Smush now lets you compress any image in any directory – so that you can optimize all the images on your site – including NextGEN images, images stored on Amazon S3 using WP Offload Media and images in EVERY WordPress plugin and theme package!

Compatible with Your Favorite Themes, Page Builders, and Media Library Plugins

No matter what theme or plugins you use to manage your WordPress media library, Smush has you covered. Check out just a few of the popular products Smush is working with to help make your site faster and more efficient:

Incorrect Image Size Detection

Smush includes a wrong-size image finder. Activate this feature, and your images will be highlighted with smart tips to let you easily resize your images. Quickly locate the images that are keeping you from getting that perfect 100 on your Google PageSpeed test.

Defer Offscreen Images (Lazy Load)

Smush includes built-in lazy loading. If your page has a bunch of images below the fold, lazy loading will drastically speed up your page by serving only the images being viewed, and delaying others further down the page.

Save time with Smush Configs

Configs allow you to save your preferred Smush configuration settings and apply them to your other sites in a few clicks. You can create unlimited configs.

Here’s What Our Users Are Saying


“我不知道这些图像拖累了我的页面加载时间。该插件花费的时间几乎减少了一半。” – karlcw


“I optimise my photos in Photoshop, but Smush makes it so easy – it does it automatically. I can just sit back and enjoy the speed.” – helen432


“ Smush帮助减少了我网站上的文件总数并提高了浏览速度。做的好各位!” – pdci


“它非常离散,不会让我烦恼API密钥或其他附加安装步骤。插件的主仪表板使我获得了很好的洞察力。总体而言,它确实满足了我的需求,并且如果我的需求发生变化,我将愿意升级为pro 。我会毫不犹豫地推荐给客户/朋友。继续使用!”- tarkan_


Smush can be used to optimize all images across your entire network! Use global settings, or configure each site individually.

Smush is super easy to use – no confusing image compression software settings. Smush lets you optimize all images in your library either one at a time, or all together. Plus, configure auto-smush to asynchronously scale and compress some or all of your images as they are being uploaded – it’s incredibly fast.



  • Hummingbird-页面速度优化
  • SmartCrawl-SEO优化器
  • Forminator – 表单,投票和测验生成器
  • Defender -安全、监控和黑客保护
  • Hustle-弹出窗口、幻灯片和电子邮件选择加入
  • Beehive – 可自定义的Google Analytics(分析)仪表板

Smush can take care of all your image compression needs… all for free!

However, if you’d like fast CDN image delivery, WebP conversion, automatic image resizing, the ability to optimize (or optimise) images up to 256MB, bulk smush optimization for all your images in just one-click, auto-convert PNG to JPEG, the ability to make a copy of your full-sized images (to restore them at any point), you can always take the next step with WP Smush Pro. And get even more with her whole team of WordPress optimization hero friends (security, SEO, performance, support, and maintenance automation) – trusted by thousands of agencies and freelancers offering site maintenance services.



Smush uses a third-party email service (Mailchimp) to send informational emails (opt-in) to the site administrator. The administrator’s email address is sent to Mailchimp and a cookie is set by the service. Only administrator information is collected by Mailchimp.

Smush将图像发送到WPMU DEV服务器以优化它们以供web使用。这包括EXIF数据的传输。EXIF数据将被剥离或按原样返回。它不存储在WPMU开发服务器上。


WPMU DEV是优质WordPress插件,服务和支持的优质供应商。在此处了解更多信息:




最初由Alex Dunae在Dialect( dialect.ca ,在’dialect dot ca’发邮件给’alex’)撰写,2008年11月。


  • Getting started couldn’t be easier with the Smush setup wizard.
  • Automatically detect and bulk optimize images.
  • Watch as Smush optimizes your media library to reduce page load and save you storage space.
  • Automatically resize images on upload.


I just finished running Smush, but Google PageSpeed still says my images need compressing and resizing. How do I fix it?

This means your images were not properly scaled for where they are being displayed. Scaling images before uploading them can be time-consuming, but can save space and speed up load time. First, determine what size your image needs to be. You can use the built-in images size detector included in the free version of Smush to find what height and width your image should be. Once you know how large the image should be, scale your images to the right size.

PageSpeed Insights告诉我延迟屏外图像。 Smush可以解决此问题吗?

延迟加载将延迟屏幕外图像的加载,直到需要它们为止。 从Smush仪表板中选择“延迟加载”,然后单击“激活”。 Smush Lazy Load开箱即用,也可以根据您的需要进行自定义。

Tip: If you’re having any issues or want to save a ton of time, the Smush Pro CDN includes auto-resizing of images.


不。 WordPress会裁剪并调整您上传的每个图像的大小,以嵌入到您的网站中。默认情况下,Smush仅压缩这些裁剪和调整大小的图像,而不压缩原始的全尺寸图像。要压缩原始的全尺寸图像,请使用Smush Pro.


GIF 文件很大,无法进行太多优化。仅当图像具有动画效果时,才应使用它们。

PNG is best for computer generated graphics (vectors, logos, fonts, etc.), images with few colors, or images with transparency.

JPG 应该用于具有多种颜色变化的摄影或图像。

提示: Smush专业版CDN包含WebP压缩 – 比JPEG和PNG文件小 25% 至 30% 的更清晰的图像。


Yes! EXIF data stores camera settings, focal length, date, time, and location information in image files. EXIF data makes image files larger, but if you are a photographer you may want to preserve this information. We have included the option to preserve EXIF image data with Smush.


First, check to see if you’re receiving any server errors. If your images seem to be processing correctly, check the file size of the images being skipped. Images over 5mb will not be processed by the free version of Smush. To compress images up to 256mb, get Smush Pro.

I activated Smush, but I don’t see any difference in image quality. How am I supposed to know if Smush is working?

Great question! It is important to understand Smush is an image optimization tool that uses lossless image compression to save disk storage space and speed up your site. Smush squeezes data out from your image files that will save space, resize huge images, and improve speed – all without changing quality.

You can track file size changes in your media library, individual image savings, directory savings, and Smush total savings with Smush stats. If you want to see some additional magic, run before-and-after page-speed tests with Google PageSpeed Insights. Every little bit of resource savings is important when it comes to page-speed!



Smush automatically handles optimizing all your images no matter where they come from, and can be used either as a standalone tool or alongside Photoshop.

我的Google PageSpeed测试告诉我提供下一代格式的图像。 Smush可以做到吗?

WebP and other Next-Gen formats are not supported on all browsers and require fallback images. For that reason, WebP conversion is only available in Smush Pro. Smush Pro converts images to WebP for a 25-30% savings over JPEG and PNG, and serves fallback images on unsupported browsers.

是优化(optimise 英)还是优化(optimize 美)?

It depends what side of the pond you live on… but whether you say optimize, optimise, optimizer, or Smush goddess of speed, this plugin will make sure your images are loading lightning fast.

How can I report security issues or bugs?

We take plugin security incredibly seriously; if you have a bug or vulnerability to report, you can do so through the Patchstack Vulnerability Disclosure Program. It’s fast, easy, and you will be notified when the issue is fixed. Report a vulnerability.


2024 年 4 月 27 日 1 回复
Great plugin. I have been using the lite version for a while. Works well. My Multisite (3 sites) is currently having Cloudflare free CDN. Now, i need to use Smush Pro CDN. Would that cause issue? Can i optimize all images for all my sites to webp? is there an option to remove EXIF info from these images? thanks
2024 年 4 月 23 日 1 回复
me encanta no tener que preocuparme por cuáles imágenes están optimizadas y cuales no, simplemente uso el botón de optimizar y Smush se encarga


“Smush – Optimize Images | Compress and Lazy Load Images | Convert WebP” 是开源软件。 以下人员对此插件做出了贡献。


「Smush – Optimize Images | Compress and Lazy Load Images | Convert WebP」插件已被翻译至 39 种本地化语言。 感谢所有译者为本插件所做的贡献。

将“Smush – Optimize Images | Compress and Lazy Load Images | Convert WebP”翻译成您的语言。




3.16.2 ( 2024-04-17 )

  • Fix: LazyLoad module not working correctly for picture elements in certain situations
  • Fix: LazyLoad module not working correctly for some CSS variables
  • Fix: Better handling of !important CSS rules by the LazyLoad module
  • Fix: Performance issues on some WooCommerce pages

3.16.1 ( 2024-03-27 )

  • Improvement: Better compatibility with page builders
  • Improvement: General code improvements
  • Fix: WP Offload integration preventing some formats from getting offloaded

3.16.0 ( 2024-03-06 )

  • New: Directly serve Local Webp images, no rewrite rules required!
  • New: Support for inline style tags in CDN and Local WebP modules
  • New: Support for multiple background images in CDN and Local WebP modules
  • New: Better support for relative links in CDN and Local WebP modules
  • New: Better REST API support in CDN and Local WebP modules
  • New: CDN and Local WebP images served in WooCommerce REST API responses
  • New: Local WebP compatibility with Windows IIS servers
  • New: Local WebP compatibility with bedrock
  • New: Local WebP compatibility with Litespeed
  • New: Local WebP compatibility with Cloudways
  • New: Lazy loading of background images
  • Fix: Local WebP redirection doesn’t work for images with special characters
  • Fix: Free version of Smush creating smush-webp folder when activated
  • Fix: Extra slash added to image URLs during optimization
  • Fix: WP 6.3 compatibility – Skip lazyload for high priority images

3.15.5 ( 2024-02-06 )

  • Improvement: Update the number of CDN locations
  • Improvement: Minor copy and UI adjustments

3.15.4 ( 2024-01-23 )

  • Fix: Media library scan gets stuck on some websites
  • Improvement: Minor copy and UI changes

3.15.3 ( 2023-12-20 )

  • Improvement: Code stability improvements

3.15.2 ( 2023-12-06 )

  • Fix: Compatibility issues with WP Offload Media integration
  • Fix: Resize module deletes thumbnail when there is a naming conflict

3.15.1 ( 2023-11-15 )

  • Improvement: Code stability improvements

3.15.0 ( 2023-10-11 )

  • Improvement: Image size limit increased for pro version
  • Fix: Query running frequently and causing performance issues on some sites

3.14.2 ( 2023-08-23 )

  • Fix: Media library scanner not identifying some MariaDB versions correctly
  • Improvement: Code improvements

3.14.1 ( 2023-07-24 )

  • Improvement: Minor code improvements and fixes

3.14.0 ( 2023-07-17 )

  • New: Ultra Smush – Level up your image compression, while preserving remarkable image quality
  • Fix: Resolved issue with image resize in WP versions < 6.0
  • Fix: Resolved PHP 8.x error on GoDaddy Managed WP Hosting
  • Fix: Other minor bug fixes and UI improvements

3.13.2 ( 2023-07-05 )

  • Improvement: Small code and text improvements

3.13.1 ( 2023-06-13 )

  • Improvement: Better memory management during scans
  • Fix: Dot added to file path when year and month directories disabled
  • Fix: Compatibility issue with WP.com
  • Fix: Rename config functionality not working
  • Fix: Compatibility issue with WP Offload Media
  • Fix: PHP warnings
  • Fix: Duplicate query

3.13.0 ( 2023-05-30 )

  • New: Scan for detecting changes in the media library
  • Improvement: Performance improvements on large sites
  • Improvement: Code refactoring
  • Fix: PHP warnings and notices
  • Fix: Missing comments for translation strings that have placeholders in them
  • Fix: Compatibility issues with WP Offload Media
  • Fix: Timeout on Smush pages when there are more than 200k images
  • Fix: Images incorrectly marked as requiring resmush
  • Fix: Ignore link stuck in Grid Layout mode in the media library

3.12.6 ( 2023-03-09 )

  • Enhance: Compatibility with WordPress 6.2.
  • Fix: Upgrade modal reappears after closing

3.12.5 ( 2023-01-18 )

  • Fix: CDN notice issue
  • Fix: PHP 8.2 compatibility warnings
  • Fix: Smush acting as free on staging

3.12.4 ( 2022-11-17 )

  • Improvement: Code and compatibility improvements

3.12.3 ( 2022-10-24 )

  • Fix: Free to pro upgrade issue

3.12.2 ( 2022-10-19 )

  • Improvement: Security hardening
  • Fix: Issues on older PHP versions

3.12.1 ( 2022-10-11 )

  • Fix: PHP error on non-English language sites

3.12.0 ( 2022-10-11 )

  • New: Bulk smush images in the background!
  • New: Revised limits on bulk image optimization
  • New: Better GDPR compliance by replacing Google fonts with Bunny fonts
  • New: Filter on media library page to view media items with errors
  • New: Option to receive an email once bulk smush is complete
  • Fix: Some images incorrectly selected for resmush
  • Fix: Database error while converting PNG to JPG on WordPress 6.1 Beta

3.11.1 ( 2022-08-19 )

  • Fix: Fallback to sequential processing when parallel processing not possible

3.11.0 ( 2022-08-11 )

  • New: Smush all image sizes in parallel for improved performance
  • Improvement: Code improvements

3.10.3 ( 2022-07-14 )

  • Enhance: CDN activation process
  • Enhance: Improve media library image filters
  • Enhance: CDN compatibility with Avada theme
  • Enhance: Add notice about disabled folders in directory Smush module
  • Fix: Errors table UI on bulk smush page
  • Fix: Bulk smush UI when images have been removed when page was already loaded
  • Fix: Cron job of logger library not running properly
  • Fix: Remove tools meta box from dashboard page
  • Fix: Recover image from NextGen Gallery button does not reset Smush data
  • Fix: Image dimensions meta does not reset after restoring a resized image in NextGen Gallery
  • Fix: Incorrect percent of total savings on Dashboard page
  • Fix: Pro feature enable/disable toggles are clickable in free version

3.10.2 ( 2022-06-16 )

  • Enhance: Data processing
  • Enhance: Database calls
  • Fix: Loading images from remote location

3.10.1 ( 2022-06-09 )

  • Fix: PHP error on dash page

3.10.0 ( 2022-06-09 )

  • New: Lossy compression is now free for all users
  • New: Summary meta box
  • Enhance: Move out image restore to bulk smush module
  • Enhance: Move out image resize detection to settings module
  • Enhance: Update opt-in notice design
  • Fix: Upsell notice logic
  • Fix: Skip image sizes not in WordPress format
  • Fix: Skip onboarding wizard if a config has been applied
  • Fix: Image sizes selector
  • Fix: Rename “Basic” config to “Default”
  • Fix: Do not show WebP notice in case of error
  • Fix: Auto compression does not work for NextGen Gallery
  • Fix: Settings link on Plugins page
  • Fix: Welcome modal does not close when we go to the Bulk Smush page

3.9.11 ( 2022-05-23 )

  • Enhance: Code quality
  • Fix: Minor code quality issues
  • Fix: Update internal libraries

3.9.10 ( 2022-05-17 )

  • New: Gravity Forms integration
  • New: smush_background_images_regex and smush_images_from_content_regex filters to adjust regex rules for finding images on the page
  • New: smush_cdn_before_process_background_src filter to adjust background image src
  • New: Add additional parameters to smush_skip_adding_srcset filter to allow disabling auto-resize for selected images
  • Enhance: Compatibility with WPBakery page builder
  • Enhance: Compatibility with Offload Media plugin
  • Enhance: Handling images via REST API endpoints
  • Fix: Directory Smush savings cached and not updated
  • Fix: “What’s new” modal not hiding if white label is enabled
  • Fix: Missing primary key on smush_dir_images table
  • Fix: Scaled images not being resized on resize settings change
  • Fix: Bulk Smush will now show all errors, instead of just the first 5
  • Fix: Animated GIF images not being excluded from bulk Smush
  • Fix: Only allow network wide activation of Smush

3.9.9 ( 2022-05-03 )

  • Enhance: Code quality
  • Enhance: Handling user input
  • Enhance: Update React modules to latest versions
  • Fix: XSS vulnerability when uploading modified configs

3.9.8 ( 2022-03-22 )

  • New: Add expiry header to Nginx template for WebP
  • New: Add wp_smush_webp_dir filter to customize WebP directory
  • Fix: XSS vulnerability
  • Fix: Disable submit button on Integrations page when no integrations available
  • Fix: CDN bandwidth limit status message
  • Fix: Text alignment issue on Bulk Smush page
  • Fix: Highlighting selected lazy load spinner with color accessibility
  • Fix: Compatibility issue with WP Offload Media 2.6.0
  • Fix: Undefined offset notice with certain WooCommerce themes

3.9.7 ( 2022-03-01 )

  • Fix: Local WebP is not activated on applying config after reset settings
  • Fix: Missing WebP file for WP scaled images
  • Fix: Fatal error on PHP 5.6
  • Fix: Compatibility issue with WP Offload Media

3.9.6 ( 2022-02-09 )

  • Enhance: Do not close the Directory Smush modal in case of error
  • Enhance: Tooltips in CDN module
  • Fix: Compatibility issue with PHP 8.1
  • Fix: “Choose Directory” button loading state in case of error
  • Fix: PNG to JPG conversion leaves behind some thumbnails after deleting the image
  • Fix: PNG images that need resizing don’t get converted to JPG
  • Fix: Issue creating the WebP test files
  • Fix: Incorrect unique file names during PNG to JPG conversion
  • Fix: Duplicate thumbnails while converting PNG to JPG
  • Fix: Auto refresh API status when updating to Pro version

3.9.5 ( 2022-01-25 )

  • 修复:翻译字符串
  • Fix: Remove upsells
  • Enhance: Update admin menu icon