To compress an image to 20KB: select the image, keep "Any image, 20 KB or less", press Resize & compress and download. If you also need an exact pixel size, pick your exam's signature preset instead.
How to compress Image to 20KB
- Select your image or signature.
- Keep the 20 KB preset, or pick an exam signature preset with a fixed size.
- Press Resize & compress.
- Check the preview and download.
Signatures at 10–20KB
Most recruitment portals ask for a signature between 10 and 20 KB. A clean signature in dark ink on white paper, cropped closely, fits easily and stays sharp. Files get big when they are large phone photos with a cluttered background.
Shrink the pixels, then the KB
A 12-megapixel phone photo can't sensibly fit in 20 KB. GreenPDFs reduces the pixel dimensions first and then the JPEG quality, and picks the sharpest combination under the limit. If your form also fixes the pixel size, use the matching preset in the Photo & Signature Resizer.
Exam presets
Signature presets with fixed sizes: SSC, IBPS, NEET and UPSC.
Why your file stays private
Compress Image to 20KB runs entirely inside your browser. Your file is read from your device, processed in memory and saved back to your device. It is never uploaded to GreenPDFs or anyone else, so you can use it with Aadhaar, marksheets, bank statements and other personal documents. How in-browser processing works.
Frequently asked questions
Why does my signature look blurry at 20KB?
Usually the photo had shadows or a grey background. Take it again in daylight on white paper and crop it closely.
What if the portal also has a 10KB minimum?
Use a signature preset (10–20 KB). It keeps the file above the minimum.
JPG or PNG?
Use JPG for uploads. It is accepted everywhere and is far smaller.
Are my photos uploaded?
No. Resizing and compression happen inside your browser, so your photo and signature stay on your device.