Resize image in KB

Runs in your browser
No upload
Free, no signup

This page lets you set any target file size in kilobytes. Use it when a form, portal or email system names a limit in KB and none of the preset sizes matches exactly.

In the editor, type your limit into the target file size box, keep the dimensions on Auto, and the tool lowers quality and, when needed, pixel size until the file fits.

Unit	KB

KB at a glance

Estimates assume a typical photo saved as JPG at web quality. Detailed images fit fewer pixels, smooth ones more.

Limit	Bytes	Typical pixel budget (4:3 photo)
20 KB	20480	≈ 430 × 320 px
50 KB	51200	≈ 670 × 510 px
100 KB	102,400	≈ 950 × 720 px
200 KB	204,800	≈ 1350 × 1010 px
500 KB	512,000	≈ 2130 × 1600 px

How the presets in this category work

Each preset below fills in a ready-made value, so you can skip typing it. Open any of them, add your photo, and the editor shows the settings already applied. You can still change every value before downloading: the preset is a starting point, not a lock.

If your exact value does not exist as a preset, use this page to enter your own. The result is processed in your browser with Lanczos-3 resampling for scaling, and is never uploaded.

How to resize an image in KB

Add your image. Select a photo or drag it onto the box above. JPG, PNG, WebP, AVIF, HEIC and BMP files are accepted, and the file stays on your device.
Enter your size. Type the width and height you need and choose the unit. The aspect-ratio lock keeps the proportions unless you turn it off.
Download the result. Click resize and save the file.

Related presets

Nearby sizes in this category

More in this category: Resize Image to a Target File Size. For several photos at once, use the bulk image resizer.

Frequently asked questions

How is a KB defined here?▼

The tool uses 1 KB = 1,024 bytes. Some systems use 1,000 bytes, so leave a small margin under a strict limit.

Why does the result sometimes end up well below my target?▼

The tool looks for the highest quality that fits. Small differences in quality can change the file by several KB, so the result may land slightly under the limit rather than exactly on it.

Can I change the preset values after opening the editor?▼

Yes. A preset only pre-fills the width, height, unit or target size. Every field stays editable, so you can start from the closest preset and adjust it.

Is my image uploaded anywhere?▼

No. ResizeAny decodes, resizes and re-encodes your picture inside your browser tab, so a photo you prepare for a KB resize never leaves your device. You can confirm this in your browser's developer tools: the Network tab shows no upload request while you work.

Looking for a different size or format?

Explore over 1,500+ curated presets for social media, print, and strict file sizes.

Back to Presets Directory

Choose Image(s) or Drag & Drop Here