Compress an Image to 20 KB
20 KB is a common limit for signatures and small photos on application forms. That's tight, so ImageSpark first lowers the quality and then, if needed, the dimensions until the image fits, and shows you the result before you download. Nothing is uploaded.
Your image is processed by your own browser and never uploaded. Many online editors send your photo to their servers and delete it later — this one never receives it at all.
Why use Compress Image to 20 KB
- Quality slider or a target file size such as 100 KB
- Automatic, JPG, WebP or AVIF output
- Before-and-after size comparison
- Offers your original back if the result would be larger
- Runs 100% in your browser — images never leave your device
- Pro: batch-compress up to 100 images in one job
- Custom width and height caps
- Pro batch before/after previews and a keep-original choice
- SVG and ICO input
Popular uses
- Shrinking phone photos before attaching them to an email
- Making product and blog images load faster on your website
- Getting a picture under an upload limit on a job or visa portal
- Saving storage space before archiving large photo folders
Compress Image to 20 KB: frequently asked questions
How do I compress a signature to under 20 KB?
Crop the signature tightly first with Crop Image so there's little empty paper around it, then drop it here with the 20 KB target selected and click Compress Image. Signatures on a white background compress very well.
Why did my photo get smaller in pixels?
Fitting a full photo into 20 KB often isn't possible at its original size without heavy blockiness. ImageSpark reduces the dimensions only when lowering the quality isn't enough, so the result stays as clean as possible.
The form also needs a minimum size in pixels — what then?
Resize the image to the required dimensions first with Resize Image, then compress it here. A plain background and a tight crop make it much easier to meet both limits.
Which format does the form want?
Most forms ask for JPG, which is what ImageSpark saves for photos by default. Check the form's instructions and choose JPG explicitly if it only lists JPG or JPEG.
Are my files uploaded?
No. Your signature and photos are compressed on your own device, so they're never sent to a server.