How to reduce image size to 20KB
- Choose or drop your photo in the box above — or select several photos at once to compress them all.
- The target is already set to 20KB. Choose JPEG if you are uploading to a form or portal.
- LightenPixel tests quality levels automatically and keeps the sharpest version under 20KB. If your form also has a minimum size, fill in Min KB.
- Check the preview and tap Download image (or Download all for several images).
20KB is a very small limit, often used for signatures and thumbnail photos on official forms. To get there, the image usually needs both lower quality and smaller dimensions — the tool handles both automatically.
Where 20KB images are required
- Scanned signatures on application forms
- Thumb impressions and small ID photos
- Thumbnails and icons
- Forms with strict 10–20KB limits
Tips for compressing to 20KB
- For signatures, sign in black ink on plain white paper and crop tightly around it.
- Set the max width to around 300–400 px for signatures and 200–350 px for small photos.
- Avoid PNG for this size — JPEG gets much smaller.
- If the form also has a minimum size (for example 10KB), set the target to about 18 so you stay inside the range.
Have a bit more room? The 50KB compressor keeps more detail.
Frequently asked questions
How can I compress an image to 20KB?
Add your image — the target is preset to 20 KB — and download. If quality alone can't reach 20KB, the tool also scales the image down.
How do I make a signature under 20KB?
Photograph or scan your signature, crop it tightly, choose JPEG and keep the 20 KB target. Signatures compress very well because they are mostly white space.
Why is my 20KB photo pixelated?
The image is still too large in pixels. Set a smaller max width, such as 300 px, so more of the 20KB is spent on detail.
More free image tools
Reduce size in KBAny size or a KB range
Compress to 100KBFor forms, portals and email
Compress to 50KBPhotos for online applications
Compress to 20KBSignatures and small photos
Resize signature10–20KB signature images
Compress JPEGShrink JPG photos online
Compress PNGKeeps transparency
Compress WebPConvert and shrink to WebP