Tools / Reduce Image Size in KB

Reduce Image Size in KB

Hit an exact file size in KB, free.

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Reduce Image Size in KB

Pick a size in KB and get the best quality image that fits under it.

Or drag your image here

JPG, PNG, WebP, HEIC and more. Max 20MB

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Looking to reduce an image to a size in KB at scale?

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Free Online Reduce Image Size in KB

When the upload form says 100 KB maximum, this is the tool that gets you there.

Why use our Reduce Image Size in KB tool?

Forms and portals set a hard limit in KB, not a quality slider. Type the number you need and the tool compresses until it fits.

Built for the browser

Works right in your browser, free, with no software to install and no watermarks.

You set the number

Pick 20, 50, 100, 200 or 500 KB, or type the exact size the form is asking for.

As much quality as fits

Compression is tuned to land under your limit while keeping the image as clean as it can.

Quality preserved

Cloudinary keeps your output crisp and true to the original.

Do it at scale

Process one file or thousands with our free API and reduce an image to a size in KB automatically, with no manual steps.

Format versatility

Works with all major formats, so your result fits right into your workflow.

How to reduce an image to a size in KB in 3 steps

Reduce your image in 3 simple steps. Upload it, set your target in KB, and download.

Upload your image

Drag and drop your image into the browser, or upload it from your device.

Set your target in KB

Choose a preset or type the exact size you need, then press Reduce.

Download

Save your result, with no watermarks.

Go beyond a size limit

Compress and optimize your images with more free tools: Compress Image, Compress Image to 100KB, Image Optimizer.

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.
An arrow pointing from the original asset to the cropped asset
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.
The same asset cropped using the following settings: Aspect Ratio: 1:2. Crop Mode: Content-Aware.
Images
Videos
Crop Mode
Aspect Ratio
Original
18 MB

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

The original asset:
JPEG
135 KB
WebP
135 KB
AVIF
90 KB
JPEG XL
94 KB
The image after being optimized using the following settings: Quality: Auto. Width: 1000px.
Original
18 MB

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

The original asset:
JPEG
135 KB
WebP
135 KB
AVIF
90 KB
JPEG XL
94 KB
The image after being optimized using the following settings: Quality: Auto. Width: 1000px.
Images
Videos
Quality
Width
An un-cropped image overlaid with a croppingai window showing how it would be cropped by Cloudinary.
An arrow pointing from the original asset to the cropped asset
The same asset cropped using the following settings: Aspect Ratio: 1:1. Crop Mode: Content-Aware.
Images
Videos
Crop Mode
Aspect Ratio
The original image:
An arrow pointing from the original asset to the transformed asset.
The personalized image:
The original image:
The personalized image:
Product Photos
Backgrounds
Overlays
Duration
Full length video: Surfing Trip
An arrow pointing from the original video to the AI-generated preview.
Duration
A shorter video preview generated by Cloudinary's AI using the following settings: Duration: 15 seconds. Max Clips: 9. Min Clip Length: 1 second.
Videos
Duration
Max Clips
Min Clip Length
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

It compresses an image until the file lands under a size you set in kilobytes. That is a different job from a quality slider: forms, job portals, government sites and school systems set a hard ceiling such as 100 KB or 200 KB and reject anything above it, no matter how good it looks. You type the number, the tool compresses to fit, and you download a file that passes.

Just under it, which is the only answer that is useful. In testing, a 113 KB photo asked to come in at 50 KB came back at 49,893 bytes. You can pick one of the presets at 20, 50, 100, 200 or 500 KB, or type an exact figure if the form you are filling in asks for something unusual.

Yes. It is free online, there is no watermark and nothing to install. Upload the image, set your limit in KB, press reduce and download the result. The same compression is available through the Cloudinary API when you need it applied automatically rather than one file at a time.

Some, and that is the trade you are making. The tighter the limit, the harder the compression has to work. As a rough guide, a photograph at 200 KB or more still looks clean on screen, 100 KB is usually fine for a profile picture or a document scan, and anything under 50 KB starts to show artefacts on detailed images. Switching the output to WebP buys you noticeably more quality at the same file size when the destination accepts it.

Yes. Developers can set quality and size targets with the Cloudinary API so every upload is delivered under the limit without anyone checking. If you are after a specific common target rather than a custom one, there are dedicated pages such as Compress Image and Resize Image to 50KB.

Related tools: Compress Image · Resize Image to 50KB · Convert DPI

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