UnderKb

Compress to a size

Compress an image to KB

Set a kilobyte budget. We drop quality first, then scale pixels if needed. No account.

Comprime una foto a 50, 200 o 500 KB. JPG, PNG o WebP. Sin cuenta.

How to use it

  1. Drop the file

    JPG, PNG, WebP, or GIF (first frame). Free 20 MB. Pro: 50 MB or a ZIP of 20.

  2. Set the budget

    200 KB is solid for web and email. 50 KB for thumbnails.

  3. Download

    Quality first; if it still will not fit, we shrink the long edge.

Why a kilobyte budget beats a quality slider

  • The number is the contract

    Email, LMS, and forms reject files over a cap. A quality slider cannot promise 200 KB.

  • Quality first, then pixels

    We lower JPEG/WebP quality before shrinking the long edge, so you keep resolution until the budget forces a scale.

  • Honest miss

    If a PNG still will not fit, we say so. We do not pretend every screenshot becomes 50 KB.

  • No account

    Upload, download, gone in about 30 minutes. We do not keep a gallery.

Jobs this compressor is for

  • Job application form

    The portal says max 200 KB. Default target. Download and attach.

  • Course upload

    A 12 MP phone photo will not pass. 500 KB is usually enough for a lecture slide.

  • Thumbnail

    50 KB for a card image. Expect a smaller long edge.

Limits

Free uploads up to 20 MB, one file. A Pro key allows 50 MB and a ZIP of up to 20 images (sequential on this 512 MB machine). Animated GIFs keep the first frame. A huge PNG can still miss a tiny budget or time out. Results live in memory about 30 minutes.

FAQ

Can I compress to 200 KB?

Yes. 200 KB is the default. You can also pick 50, 100, 500, or 1024.

Do you store my photos?

The result stays in memory about 30 minutes so you can download it, then it expires.

JPG, PNG, or WebP?

Photos usually hit the budget as JPG or WebP. PNG can stay huge.

Is there an account?

No. Ads may appear around the tool. The file itself is not paywalled.

Can I compress a folder?

Free is one file. A Pro key on /pricing lets you drop up to 20 images and download a ZIP.

What if it still will not fit?

We already dropped quality and scaled the long edge. A dense PNG may miss a tiny cap — try JPG or a larger budget.

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