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Compress image to 20 KB

A signature or small photo that fits the tightest form box.

PrivateNo uploadsRuns in your browser

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Format
Quality: set to fit the file size
Quick target

What fits in 20 KB

Where 20 KB is asked for

  • Signatures on exam and job application forms (often 10 to 20 KB)
  • Small photo boxes on government and bank forms
  • Scholarship and ID card portals
  • Old systems that only take tiny uploads

How big the picture stays

About 300 to 400 px on the long side for a photo. A signature on white paper can keep 600 px or more, because plain paper takes almost no room.

Phone photo
3.3 MB, 4032 x 2663 px
After
18.5 KB, 390 x 257 px

Tested on a 3.3 MB family photo from a phone: readable, the picture is smaller rather than blurred.

Tip for 20 KB

For a signature, sign in black or dark blue ink on plain white paper and crop close to the ink. It comes out sharper.

Other sizes: 100 KB, 50 KB, 200 KB, 500 KB.

How KB is counted. Here 20 KB means 20,000 bytes. Some sites count 20 x 1,024 = 20,480 bytes (sometimes written KiB). A file under 20,000 bytes passes both.

How to compress an image to 20 KB

  1. Choose photos

    Tap the big button or drop photos on it. You can add many at once, or paste a picture.

  2. It fits 20 KB

    Each photo is made just under 20 KB straight away. The row shows the size before and after.

  3. Check and download

    Zoom in on the before and after to see it is clear, then download one photo or all as a zip.

Good to know

  • Max file size keeps the whole picture and balances pixel size and quality, so the file lands just under the limit and still looks clear. The row shows the quality it settled on.
  • Paper with text, such as a form or certificate, keeps more pixels so the words stay readable, and may be saved in grey for a very small size.
  • Longest side limits the longer edge and keeps the aspect ratio. 0 keeps the original size, and images smaller than the limit are never enlarged.
  • Large photos are processed in the background, so the page stays smooth. SVG files are turned into pixels at their own size.
  • Animated GIF and WebP files are converted as a still image of the first frame.
  • Green output sizes are smaller than the original. Turning a small JPEG into PNG usually makes it larger, because PNG is lossless.
  • The zip is built in the browser and stores the files without extra compression, since the images are already compressed.
  • A file that fails to decode shows the reason on its row. HEIC and RAW files are the usual cause; export them as JPEG from your phone or camera software first.

Where people use it

  • Signature for an exam form

    Shrink a photo of your signature to under 20 KB and keep every stroke readable.

  • Tiny photo box on a form

    Fit a head and shoulders photo into a 20 KB upload limit.

  • Exact pixels and a KB range

    When the form also gives the width and height, use the form photo tool.

    Resize photo and signature in KB for exam and job forms

  • Crop first for a clearer face

    Cut the photo down to your face, then compress it here.

    Crop image online

Why this one

Instead of pushing quality down until the photo turns into blocks, it makes the picture a little smaller and keeps it clear, and paper with writing keeps more pixels.

  • The file lands just under 20 KB, so the form takes it.
  • Writing on paper is spotted and kept sharp.
  • Nothing is uploaded. Your photos stay on your device.

What you can change

  • Target already set to 20 KB
  • Keep the format or switch to JPEG or WebP
  • Longest side limit in pixels
  • Many photos at once, one zip

People find this page by searching

  • compress image to 20kb
  • reduce image size to 20kb
  • signature size 20kb
  • photo below 20kb for form
  • jpg to 20kb
  • resize image to 20kb online
Cite this tool
  • APA
    sdev.in. (n.d.). Compress image to 20 KB online [Web tool]. https://www.sdev.in/tools/compress-image-to-20kb
  • MLA
    "Compress image to 20 KB online." sdev.in, https://www.sdev.in/tools/compress-image-to-20kb.
  • Chicago
    sdev.in. "Compress image to 20 KB online." https://www.sdev.in/tools/compress-image-to-20kb.
  • BibTeX
    @misc{sdev-compress-image-to-20kb,
  title = {Compress image to 20 KB online},
  author = {{sdev.in}},
  howpublished = {\url{https://www.sdev.in/tools/compress-image-to-20kb}},
  note = {Web tool}
}

Questions people ask

How do I compress a signature to 20 KB?

Choose the signature photo. The 20 KB target is already set. Paper with writing is spotted and kept sharp, and turned grey if that keeps the writing readable.

Why does my photo look smaller at 20 KB?

20 KB is very little room for a photo. The tool keeps the face clear by making the picture a bit smaller rather than blurring it. If the form allows more, 50 KB looks much better.

Will my photo still be clear at 20 KB?

Yes, as clear as the size allows. The tool keeps the whole picture and never crops it. It lowers the pixel size a little and keeps the quality in a good range, instead of pushing the quality so low that faces turn into blocks. Zoom in on the before and after to check.

Is the file really under 20 KB?

Yes. It aims just under 20000 bytes, so it passes whether a form counts a KB as 1000 or 1024 bytes. The row shows the exact size before and after.

What happens to a PNG?

A PNG photo cannot get this small and stay clear, so it is saved as JPEG and the row says so. A PNG with see-through parts, such as a logo, stays PNG.

Are my photos uploaded?

No. Everything happens in your browser on your own device. Nothing is sent to a server.

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