NG0913 is an Angular runtime warning about image loading. It appears when an image download is substantially larger than its rendered size, or when the page’s Largest Contentful Paint (LCP) image is marked for lazy loading. Resize or serve responsive images to address the first case; prioritize the LCP image so it can load promptly in the second.
What does NG0913 mean?
NG0913 covers two image-loading conditions, not every kind of slow runtime behavior. Angular identifies the affected image by its URL in the console warning; use that URL to find the corresponding <img> element in your application. Angular’s NG0913 documentation describes both triggers.
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An image is much larger than its rendered size
Angular compares the downloaded image’s intrinsic dimensions with its displayed dimensions after CSS sizing and adjustment for the device pixel ratio. It warns when the downloaded image is more than 1200 pixels too large in either dimension. The threshold is documented by Angular; the retrieved documentation does not state a publication year. An oversized download can slow page loading and negatively affect Core Web Vitals.
The LCP image is lazy-loaded
The LCP element is the largest contentful element rendered during page load. If Angular detects loading="lazy" on that element, it warns because the browser may need to perform layout calculations to determine whether the image is in the viewport before requesting it. That can delay the image that matters most to the initial visual load.
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How do I fix an oversized image warning?
Choose the remedy that fits how the image is used. A fixed, known-size slot may need only a smaller source file; layouts that vary by viewport or pixel density benefit from responsive candidates.
| Remedy | Best fit | What to do |
|---|---|---|
| Use a smaller source image | A fixed image slot with a suitable asset available | Serve a source whose dimensions are closer to the rendered requirement. |
Use srcset and sizes |
Images displayed at different sizes across layouts or pixel densities | Provide multiple image candidates with srcset, and describe the rendered slot with sizes so the browser can choose an appropriate candidate. |
Use NgOptimizedImage |
Angular applications that want built-in image optimization and responsive-image support | Use the directive’s responsive-image features; an image loader is optional and can enable URL transformations through an image CDN. |
Angular’s NG0913 guidance lists smaller sources, srcset, and NgOptimizedImage as remedies. Its image optimization guide recommends setting sizes for responsive images so the browser can select an appropriate candidate.
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Import NgOptimizedImage from @angular/common, include it in the component’s imports, and replace the image’s src binding with ngSrc. The directive requires width and height; for responsive images, these attributes should represent the image’s intrinsic dimensions. The dimensions also help prevent image-related layout shifts.
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})The directive can generate a srcset and add preconnect or server-rendered preload hints. A loader is optional. Angular says the directive became stable in Angular v15 and was backported as stable to v13.4.0 and v14.3.0; check your project’s Angular version and current guide before making upgrade-specific decisions. See the official setup guide.
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Why is Angular warning that my LCP image is lazy-loaded?
Do not defer the image that is responsible for the page’s LCP. You can change its loading behavior to eager, or use NgOptimizedImage and mark it with priority. Angular documents that priority applies fetchpriority="high" and loading="eager", and generates a preload link when rendering on the server. The directive lazy-loads other images by default, so reserve priority for images that genuinely need it. Its API warns that making non-priority images eager or auto can hurt loading performance.
For an image using the directive, the relevant distinction is:
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priorityon the LCP image to prioritize its request.- Default lazy loading for other images that do not need to load immediately.
See Angular’s image optimization guide and NgOptimizedImage API reference for the documented behavior.
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Can I disable the NG0913 warnings?
Yes. Angular documents two separate root-level IMAGE_CONFIG options: disableImageSizeWarning suppresses the oversized-image warning, and disableImageLazyLoadWarning suppresses the lazy-loaded-LCP warning. Both fields are booleans, as specified in the ImageConfig API. Disabling a warning hides the diagnostic; it does not change the image dimensions or loading behavior that prompted it. The NG0913 page documents the warning configuration.
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Is NG0913 an Angular compiler diagnostic?
No. NG0913 is an image-related runtime warning. Angular’s extended diagnostics are a separate compiler feature for code patterns that may be valid but have caveats. They emit when strictTemplates is enabled, are warnings by default, and can be individually set to warning, error, or suppress. Angular also notes that a minor release may add or enable diagnostics, so an upgrade can surface new compiler warnings. Those extended-diagnostics settings do not configure NG0913. See the extended diagnostics overview.
Does fixing NG0913 solve all Angular performance problems?
No. This warning is specifically about image sizing and loading priority. For broader runtime slowness, profile the application to locate the actual bottleneck rather than treating NG0913 as a general performance diagnosis. Angular’s performance overview distinguishes loading performance from runtime responsiveness and describes Chrome DevTools and Angular DevTools as profiling options.
For runtime issues, Angular’s runtime performance guidance discusses change-detection frequency and related causes. Its slow computations guide explains that template expressions and certain lifecycle hooks run synchronously during change detection, so an expensive computation can slow the cycle. Profile first, then investigate the measured source of the slowdown.
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