Image Size Reducer — Compress to an Exact KB

🟢 Runs Locally — verified: your files are processed in this browser. No uploads.

Type a target size in KB and this image size reducer finds the best possible quality that fits — JPG or WebP output, right in your browser.

Start converting ↓

🔒 100% private & client-side
⚡ No uploads — instant
💰 Free forever, no limits
📦 Batch & ZIP download

Drop, convert, download

Processing happens on your device using Web Workers — your images never leave the browser.

Your converted images will appear here.

How to use this tool

1

Upload your image

Drag and drop a JPG, PNG or WebP image into the upload zone.
2

Set a target size

Type the size you need in kilobytes (for example 50 or 100) and pick JPG or WebP output.
3

Compress & download

Click Compress to size. The tool adjusts quality automatically to land as close to your target as possible.

Format comparison

Setting	Best for
Under 50 KB	Avatars & email attachments
Under 100 KB	Web images & forms
Under 200 KB	Blog posts & product photos
JPG / WebP	Lossy output with adjustable quality

Frequently asked questions

How does compression to an exact size work?

The tool re-encodes your image at different quality levels using binary search, then picks the quality that lands closest to your target size.

Will my image reach exactly the size I type?

It gets very close — usually within 5%. If the original image is smaller than the target, the output may already be smaller than requested.

Is my image uploaded to a server?

No. Everything runs in your browser using Web Workers and the Canvas API — your image never leaves your device.

Which formats can the reducer take?

JPG, PNG and WebP go in; JPG or WebP come out. If the original image is already smaller than the target you type, the output stays at its current size.

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