Resize Image to 40KB

Resize images to 40kB with precision—perfect for optimizing mobile experiences. Maintain clarity while reducing bounce rates. Use Cloudinary to handle thousands of compressions with built-in CDN and automation.

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Resize Image to 40KB for Free

Generate a compact 40kB image instantly, no installations necessary. Just drag and drop to get a quick-loading image without losing key visual data.

Why Choose Our Image to 40KB Resizer?

Quickly resize image to 40KB online in seconds, ad-free, with the option for developers to use our API for large-scale compression.

Beyond Image Resizing

Go further than reducing file size. With AI-powered tools like Generative Fill, Object Removal, and Replace, you can seamlessly edit and customize images — unlocking new levels of creativity and flexibility in content creation.

Image Enhancement

From 3D animations and interactive product displays to real-time filtering, Cloudinary’s API offers powerful image enhancement capabilities. Developers can effortlessly refresh older images and make them look stunning again.

Performance Optimization

Images are always delivered in the best quality and format for each user’s device, browser, and connection. Whether it’s JPG, PNG, HEIC, or another format, our system automatically selects the most efficient option for peak performance.

Batch resize images

Effortlessly resize your images to 40KB in bulk, or connect our free API to seamlessly auto-optimize every image without any extra work!

Workflow Automation

Set up preset configurations to save time and streamline your process. Files are automatically compressed, transformed, and ready for delivery immediately after upload.

Image Formats Versatility

Expand your image workflow with support for next-gen formats like WebP, JXL, and AVIF. These advanced options deliver the perfect balance of quality and efficiency for all your visual assets.

How to resize images to 40KB

Quickly resize your images to exactly 40KB, or join Cloudinary to automate optimization for thousands of images at scale.

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Add your images

Upload or drag and drop your images into the browser

Start Resizing

Get started with image resizing by resizing your images into smaller, more efficient sizes.

Download resized images

When resizing is finished, download your optimized images, each reduced to under 40KB.

Explore Beyond Image Resizing

A woman and a golden retriever in the mountains. They're sitting, facing away from the camera while the dog noses the woman. They're surrounded by natural splendor including majestic mountains, puffy clouds, and evergreen-studded hills. — An un-cropped image overlaid with a cropping window showing how it would be cropped by Cloudinary.

Original: 18 MB
We’re showing a resized version of the original asset to avoid slow loading speeds. View the original.

JPEG: 135 KB
WebP: 135 KB
AVIF: 90 KB
JPEG XL: 94 KB

Original: 18 MB
We’re showing a resized version of the original asset to avoid slow loading speeds. View the original.

JPEG: 135 KB
WebP: 135 KB
AVIF: 90 KB
JPEG XL: 94 KB

Duration: 1:42

Duration: 0:15

URL:

/ar_0.5,c_fill,g_auto,w_433/q_auto/f_auto/hiking_dog_mountain.jpg

cloudinary.image("hiking_dog_mountain.jpg", {transformation: [
  {aspect_ratio: "0.5", gravity: "auto", width: 433, crop: "fill"},
  {quality: "auto"},
  {fetch_format: "auto"}
  ]})

new CloudinaryImage("hiking_dog_mountain.jpg")
  .resize(
    fill()
      .width(433)
      .aspectRatio(0.5)
      .gravity(autoGravity())
  )
  .delivery(quality(auto()))
  .delivery(format(auto()));

new CloudinaryImage("hiking_dog_mountain.jpg")
  .resize(
    fill()
      .width(433)
      .aspectRatio(0.5)
      .gravity(autoGravity())
  )
  .delivery(quality(auto()))
  .delivery(format(auto()));

new CloudinaryImage("hiking_dog_mountain.jpg")
  .resize(
    fill()
      .width(433)
      .aspectRatio(0.5)
      .gravity(autoGravity())
  )
  .delivery(quality(auto()))
  .delivery(format(auto()));

new CloudinaryImage("hiking_dog_mountain.jpg")
  .resize(
    fill()
      .width(433)
      .aspectRatio(0.5)
      .gravity(autoGravity())
  )
  .delivery(quality(auto()))
  .delivery(format(auto()));

CloudinaryImage("hiking_dog_mountain.jpg").image(transformation=[
  {'aspect_ratio': "0.5", 'gravity': "auto", 'width': 433, 'crop': "fill"},
  {'quality': "auto"},
  {'fetch_format': "auto"}
  ])

(new ImageTag('hiking_dog_mountain.jpg'))
	->resize(Resize::fill()->width(433)
->aspectRatio(0.5)
	->gravity(
	Gravity::autoGravity())
	)
	->delivery(Delivery::quality(
	Quality::auto()))
	->delivery(Delivery::format(
	Format::auto()));

cloudinary.url().transformation(new Transformation()
  .aspectRatio("0.5").gravity("auto").width(433).crop("fill").chain()
  .quality("auto").chain()
  .fetchFormat("auto")).imageTag("hiking_dog_mountain.jpg");

cl_image_tag("hiking_dog_mountain.jpg", transformation: [
  {aspect_ratio: "0.5", gravity: "auto", width: 433, crop: "fill"},
  {quality: "auto"},
  {fetch_format: "auto"}
  ])

cloudinary.Api.UrlImgUp.Transform(new Transformation()
  .AspectRatio("0.5").Gravity("auto").Width(433).Crop("fill").Chain()
  .Quality("auto").Chain()
  .FetchFormat("auto")).BuildImageTag("hiking_dog_mountain.jpg")

cloudinary.image('hiking_dog_mountain.jpg').transformation(Transformation()
	.resize(Resize.fill().width(433)
.aspectRatio(0.5)
	.gravity(
	Gravity.autoGravity())
	)
	.delivery(Delivery.quality(
	Quality.auto()))
	.delivery(Delivery.format(
	Format.auto())));

imageView.cldSetImage(cloudinary.createUrl().setTransformation(CLDTransformation()
  .setAspectRatio("0.5").setGravity("auto").setWidth(433).setCrop("fill").chain()
  .setQuality("auto").chain()
  .setFetchFormat("auto")).generate("hiking_dog_mountain.jpg")!, cloudinary: cloudinary)

MediaManager.get().url().transformation(new Transformation()
  .aspectRatio("0.5").gravity("auto").width(433).crop("fill").chain()
  .quality("auto").chain()
  .fetchFormat("auto")).generate("hiking_dog_mountain.jpg");

cloudinary.image('hiking_dog_mountain.jpg').transformation(Transformation()
	.resize(Resize.fill().width(433)
.aspectRatio(0.5)
	.gravity(
	Gravity.autoGravity())
	)
	.delivery(Delivery.quality(
	Quality.auto()))
	.delivery(Delivery.format(
	Format.auto())));

cloudinary.image {
	publicId("hiking_dog_mountain.jpg")
	 resize(Resize.fill() { width(433)
 aspectRatio(0.5F)
	 gravity(
	Gravity.autoGravity())
	 })
	 delivery(Delivery.quality(
	Quality.auto()))
	 delivery(Delivery.format(
	Format.auto())) 
}.generate()

new CloudinaryImage("hiking_dog_mountain.jpg")
  .resize(
    fill()
      .width(433)
      .aspectRatio(0.5)
      .gravity(autoGravity())
  )
  .delivery(quality(auto()))
  .delivery(format(auto()));

Frequently Asked Questions

Get Answers to Your Questions About Our Chat Software and Features

How can I use Cloudinary’s image to 40KB tool to resize images without losing quality?

Need to resize an image to 40KB without compromising image quality? Cloudinary provides an efficient tool that reduces JPG, PNG, HEIC, and other file formats to 40KB or less while preserving visual clarity. Simply upload or drag your image and the compression begins instantly. With intelligent automation using f_auto for AVIF or WebP and q_auto for optimized quality, your images remain crisp and lightweight. Perfect for mobile applications and media-rich websites aiming to boost speed and enhance user experience.

Can I automate image to 40KB resizing using Cloudinary’s API?

Cloudinary’s powerful API gives you complete flexibility to compress image to 40KB efficiently. When uploading via API, you can apply settings like q_auto:low, f_auto, and fl_lossy to reduce file size automatically. You can also set custom constraints or chain transformations to make sure every image stays within the 40KB limit. This makes it perfect for handling large volumes of content or user-generated uploads with minimal manual effort.

Is the resizing to 40Kb “lossless”?

To compress image to 40KB effectively, Cloudinary uses perceptual optimization that is visually lossless and content-aware. This advanced method preserves edges, textures, and essential visual details, while removing redundant data. As a result, quality changes are minimal and typically invisible at standard viewing sizes. While lossless formats like PNG or AVIF may exceed 40KB due to bit-exact requirements, they are suitable when precise fidelity is necessary. For most marketing and photographic content, perceptual settings produce lightweight images with nearly no visible difference. If you notice any artifacts, slightly increasing the quality level or reducing the image dimensions can help maintain clean visuals close to the 40KB target.