How to resize your signature
- Sign in black or dark blue ink on plain white paper.
- Take a photo or scan it, then crop tightly around the signature.
- Add the image above. It is preset to JPEG, 10–20 KB and 400 px wide — the most common requirement.
- Check the preview is clear, then download.
Different forms ask for different sizes. Just change Max KB and Min KB to match yours — for example 10 and 20, or 4 and 12.
Common signature requirements
| Requirement | What to enter |
|---|---|
| "Between 10KB and 20KB" | Max KB 20, Min KB 10 |
| "Less than 20KB" | Max KB 20, leave Min KB empty |
| "Between 4KB and 12KB" | Max KB 12, Min KB 4 |
| Size in pixels, e.g. 140 × 60 | Set Max width to 140 |
Tips for a clear signature
- Use a thick pen — thin lines can disappear when the image is made small.
- Photograph in daylight without shadows; a clean white background compresses to almost nothing.
- Crop out everything except the signature before uploading.
- Keep the original photo in case the form rejects the first attempt.
Frequently asked questions
How do I make my signature between 10KB and 20KB?
Add your signature image above — it is preset to Max 20 KB and Min 10 KB as JPEG. Download when the preview looks clear.
Why is my signature image too small in KB?
Signatures are mostly white space, so they compress very well — sometimes below a form's minimum. Fill in Min KB and LightenPixel raises the quality or size until it meets the minimum.
Which format should a signature be?
JPG/JPEG is accepted by almost every form. Use it unless the form asks for something else.
Is my signature uploaded anywhere?
No. Everything happens in your browser, so your signature never leaves your device.
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