# Image Compressor to Size

> Compress a JPG, PNG, or WebP image to an exact target file size in KB. Iteratively re-encodes until the result fits.

URL: https://uttir.com/image-compressor-to-size
Categories: image-tools, file-tools, converters
Privacy: Your image never leaves the browser. Compression happens locally in JavaScript.

## About

Most image compressors let you pick a quality, but not a target size. This one does the opposite: you pick a size (e.g. 100 KB), and the tool iteratively re-encodes the image at decreasing quality until the result fits.

It runs entirely in your browser. The image never touches a server, so you can compress sensitive photos without uploading them. Supports JPG, PNG, and WebP output, and can also reduce dimensions if quality alone is not enough.

## How to use

1. **Choose an image** — JPG, PNG, or WebP, up to 25 MB.
2. **Set a target size** — In kilobytes. Common: 100 KB for email, 50 KB for avatars, 20 KB for thumbnails.
3. **Pick output format** — WebP usually gives the smallest file at a given quality.
4. **Click Compress** — The tool re-encodes iteratively and shows the result.

## Examples

### Compress a 4 MB photo to 200 KB

A real use case: shrinking a phone photo to attach to an email.

Input:

```
4 MB JPG → 200 KB target
```

Output:

```
~120 KB JPG, quality ~0.45, no resize needed
```

## FAQ

### How does it work?

It uses binary search on the JPEG / WebP quality setting. Each iteration re-encodes the image, measures the byte size, and narrows the quality range until the result is just under your target. If quality alone cannot get there, it reduces dimensions by 10% and retries.

### What if my image is already smaller than the target?

The tool will tell you. It does not upscale or add fake data — the original is already optimal for that target.

### Is WebP always smaller?

Almost always, at the same visual quality. The exceptions are small icons and very simple graphics, where PNG can be smaller. The tool lets you pick.

### Does it upload my image?

No. The compression runs in your browser using JavaScript. The file is never sent to a server.

## Related tools

- [Image Compressor](https://uttir.com/image-compressor) — Shrink image file size with quality and format control, and see the savings before you download.
- [Image Resizer](https://uttir.com/image-resizer) — Resize images to exact pixel dimensions with optional aspect-ratio lock.
- [WebP Converter](https://uttir.com/webp-converter) — Convert JPG or PNG images to modern WebP for much smaller files.
- [JPG to PNG](https://uttir.com/jpg-to-png) — Convert JPG images to lossless PNG — entirely in your browser.

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For the full HTML page with the live tool, visit https://uttir.com/image-compressor-to-size.
This file is the markdown rendering at https://uttir.com/image-compressor-to-size.md. See https://uttir.com/llms.txt for a site-wide summary.