Resize Image in KB Online Free
Pick any target from 20KB to 1MB and get an image that fits exactly. All in your browser.
or drag & drop your image here
Pick a target size. The tool automatically reduces dimensions and quality until your file fits — no upload, all in your browser.
Why resize images to an exact KB size?
Many websites, application forms and portals reject images that exceed a fixed size limit — and they usually state that limit in KB. This free tool resizes any JPG, PNG or WEBP photo to any target you pick, from 20KB all the way to 1MB, balancing dimensions and quality so the result still looks sharp.
Choose your target from the dropdown, drop in your photo, and FastResize scales it down and fine-tunes the compression until the file fits. No software to install, and the download is ready in seconds.
Your photos are processed entirely in your browser, so they are never uploaded to a server. Try Resize to 20KB or Resize to 100KB.
How to resize an image to an exact KB size
Upload your image
Click "Choose Image" or drag and drop a JPG, PNG or WEBP file. Everything is processed locally in your browser — nothing is uploaded.
Adjust settings (optional)
Use the quality slider and output format if you want more control. The defaults give the best balance of size and sharpness.
Download your resized image
The tool automatically shrinks dimensions and quality until your file hits the target. Click Download and save it anywhere.
Why use the exact-KB resize tool?
Hits your target exactly
Automatically adjusts dimensions and quality until the file is your target or smaller.
Private by Design
Images never leave your device — processed 100% in your browser.
100% Free
No signup, no watermarks, no limits. Use it as much as you need.
Instant results
A fast canvas engine that works on phones and desktops.
Frequently Asked Questions
What does 'resize image in KB' mean?
It means changing the image file size to a target in kilobytes (KB) — like 50KB or 100KB — rather than targeting a specific width and height. The tool adjusts dimensions and quality to hit the target file size.
Which KB size should I choose?
Government and exam forms usually need 20–50KB. Email and basic web uploads work well at 100–200KB. Product images and detailed photos fit best at 500KB–1MB.
How is KB different from pixels?
Pixels measure the image dimensions (width × height). KB measures the file size on disk. Smaller pixel dimensions usually mean a smaller KB file, but compression quality also plays a big role.
Can I resize to a custom KB value?
This tool offers the most common targets (20, 50, 100, 200, 500KB and 1MB). If you need another exact value, use the quality slider alongside the nearest target.
Will my image be uploaded?
No. All resizing happens in your browser, so your image never leaves your device.