Resize Image in KB Online
Free online image resizer
50% smaller
More options
Used for Make Smaller and Width & Height. Exact KB sets quality automatically.
Resize to a popular size
How it works
- 1
Upload your image
Choose a photo or signature from your device. Nothing is uploaded to any server.
- 2
Choose the KB size
Pick 10KB, 20KB, 50KB, 100KB, 200KB or a custom limit your form asks for.
- 3
Download instantly
The tool compresses to just under your target. Check the size and download.
Private
Image stays in your browser.
Fast
No upload required.
Free
No signup or watermark.
Flexible
Smaller, exact KB, or dimensions.
The simple way to resize an image in KB
Online forms set strict rules on file size in KB that a raw phone photo never meets. Resize Image in KB turns a normal image into a form-ready file in seconds — entirely inside your browser. Upload a photo or signature, pick the file-size limit your form asks for (such as 20KB, 50KB or 100KB), and download the result.
When you choose a target size, the tool lowers quality first, then gently reduces the dimensions only if needed — so you always get the clearest result that still fits the limit. Nothing is ever uploaded, and your files stay on your device. If your form needs exact pixel dimensions, open the custom settings inside the tool and type them in.
Frequently asked questions
How do I resize an image in KB?
Upload your image, choose the target file size in KB (for example 50KB), and the tool automatically lowers JPG quality — and the dimensions if needed — until the file fits. Then download it. Everything happens in your browser.
How can I resize an image to 20KB?
Open the tool, select the 20KB target, and upload your image. It will compress to at or just under 20KB. For the cleanest result, reduce the width and height in the custom settings.
Are my images uploaded to a server?
No. Every step happens locally in your browser using the HTML5 Canvas API. Your image never leaves your device and nothing is stored or transmitted.
Which image formats are supported?
You can upload JPG, PNG and WebP images. JPG output is recommended for forms because it gives the smallest file size.
What should I do if my image cannot be compressed enough?
Open the "Need exact width, height or quality?" section and reduce the dimensions, keep the format on JPG, and start from the original photo. If a target is impossible, the tool shows the smallest clear result instead of a broken file.