Optimize PNG, JPG, and WebP images without changing their pixel dimensions. Adjust the output format and quality to reduce file size, apply the same settings to several images at once, compare original and optimized sizes, and download results individually or as a ZIP. All processing happens locally in your browser and no image is ever uploaded.
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PNG, JPG, WebPor choose filesUp to 50MB per file · 30 files · 16383px per side
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Browser memory varies by device. Very large images can fail even below these limits.
Image optimization is not simply the process of making a file as small as possible. It means choosing a format and quality level suited to the image's purpose while preserving acceptable visual quality and reducing the amount of data that must be transferred.
This tool does not change an image's width or height in pixels. It creates a new file by changing the output format and, where applicable, the compression quality, while preserving the original dimensions. Changing the pixel dimensions or cropping to a ratio needs a separate resizing tool.
Each image format is suited to different content. Instead of choosing one format solely because it produces the smallest file, consider the image itself and where it will be used.
WebP is a strong first option for images used on websites. It supports both lossy and lossless compression as well as transparency, making it useful for photographs and graphics alike. Converting a PNG or JPG to WebP can often reduce file size while keeping similar visual quality. It suits website content images, landing-page images, thumbnails and cards, and product or background images.
JPG is well suited to photographs and images with many color and tonal variations. Its adjustable compression can substantially reduce file size, but it does not support transparency. It suits photographs and portraits, landscape images, and anything that does not need a transparent background. When a transparent PNG or WebP is converted to JPG, this tool fills the transparent areas with white.
PNG is useful when crisp edges, exact pixel reproduction, or transparency matters, as with logos, icons, and interface captures. Its lossless compression preserves image data but can produce large files for complex photographic content. Keeping PNG may be appropriate when faithful reproduction matters more than the smallest file.
A higher WebP or JPG quality value is not always better, and a lower value is not always appropriate. Lower values generally reduce file size but may introduce visible compression artifacts or loss of detail. Very high values can increase file size without producing a difference most viewers can notice. The default quality here is 80.
As starting points: 90-100 when preserving image quality is the priority, 75-89 for general web images, 60-74 for thumbnails or cases where a smaller file matters more, and below 60 only after checking the visible quality loss yourself.
These ranges are starting points, not absolute visual standards. Results vary with image content and encoding, so compare both the resulting file size and the actual image.
There is no single target that applies to every web image. An appropriate file size depends on the pixel dimensions, visual complexity, importance of the image on the page, and the environment in which it will be viewed.
Instead of aiming for an arbitrary number of kilobytes, confirm that the required pixel dimensions are already correct, choose a format suited to the image and its use, adjust quality when using WebP or JPG, compare the original and optimized images visually, and use the smaller file when there is no unacceptable loss of quality.
The goal is not the lowest possible file size. It is the smallest file that still meets the required visual quality.
When a web page loads, the browser downloads its images along with HTML, CSS, and JavaScript. Large files and image-heavy pages increase the amount of data a visitor must receive. This can make images take longer to appear, especially on mobile or slower connections.
Optimizing web images can help reduce the amount of data transferred by a page, image download time, mobile data usage, and the loading burden on image-heavy pages.
Image optimization alone does not solve every performance issue. Delivery method, loading strategy, caching, and CDN configuration also affect real-world performance.
The word 'size' can refer to two different properties of an image. Image dimensions are the number of horizontal and vertical pixels, such as 1200 × 630 px. File size is the amount of storage or network data used by the file, such as 842 KB.
This tool changes file size, not dimensions: a 1200 × 630 PNG at 1.84 MB comes back as a 1200 × 630 WebP at 214 KB. Use a separate image resizing or cropping tool when you need to change pixel dimensions or crop to a specific aspect ratio.
PNGs full of photographic detail or gradients gain the most from WebP. The pixel dimensions stay identical.
If the logo sits on anything other than a white background, choose WebP or PNG so the fill does not show as a visible box.
Re-encoding a compressed image at a high quality can grow it. When the result is larger, keep the original or try a lower quality.
One setting applies to every file. Process an image separately when it needs a different quality.
What it is, who it's for, how it works and why you'd use it.
Image Optimizer is a browser-based tool that reduces image file size by changing the format or compression quality without changing the image's pixel dimensions.
It is designed for designers, developers, and content creators who need smaller image files for websites, blogs, app stores, portfolios, and other digital products.
Add PNG, JPG, or WebP images, choose an output format and quality, and the tool re-encodes the images locally in your browser while showing the resulting file size.
It lets you reduce image file sizes without uploading images to an external server or installing separate image-editing software.