What this does
Signature uploads are usually tiny (10–50KB) and almost always JPEG or PNG on a white background. Phone photos of paper are the wrong source — too much wood grain and shadow. This page is for flattening a reasonably scanned or cropped signature so a form accepts it.
Photo compressors optimize faces and skies. Signatures are sparse black strokes. You often want PNG for sharp edges, or a small JPEG with little chroma. The 20KB headshot recipe will wreck a signature.
Anyone a bank asked for “signature image max 20KB” or similar.
Signature fields are leftover from paper. The server wants a postage-stamp file. Your phone wants a 12MP texture shot of a desk. Those goals conflict until you crop.
Treat ink like line art. Chroma and film grain are the enemy. If JPEG artifacts ring around the pen, you went too far on quality. Crop smaller before you crush quality again.
When to use it
- A PDF form has a signature field that only takes a small image.
- The scan is 2MB and the portal wants 20–50KB.
- The ink looks fine but the file includes the whole A4 page.
How to
- Crop first. Use any editor to cut away the rest of the page.
- Upload the crop. Drop the tight signature image here.
- Keep it small in pixels. 200–400px wide is usually enough in a PDF field.
- Export. PNG if allowed; otherwise JPEG at a quality that still looks like pen.
Features
- Tight resize. Signatures rarely need more than a few hundred pixels wide.
- Format toggle. PNG for ink, JPEG if the form forbids PNG.
- Local only. Your signature never uploads to us.
Why it helps
- Forms accept the file. Meet the KB cap after cropping, not before.
- Ink stays ink. Avoid the muddy look of over-compressed JPEG on thin lines.
Use cases
- Bank mandate scans. Tiny JPEG slots next to account numbers.
- HR onboarding. E-sign packets that still want a drawn signature image.
Examples
- Phone photo of a sign on paper. Retake on white paper, crop to ink, 300px wide, PNG. Check KB. If still huge, the crop is not tight enough.
Common mistakes
- Photographing the signature at an angle. Crop tightly and shoot straight-on, or scan.
- Heavy JPEG on thin pen strokes. Try PNG if the portal allows it, or higher JPEG quality with a tighter crop.
Tips
- Crop until you only see ink and white paper.
- If the portal allows PNG, use it for signatures. If it requires JPG, keep quality higher than you would for a 20KB face photo and crop harder instead.
FAQ
- Can you extract a signature from a PDF?
- Not on this page. Export or screenshot the signature, crop, then compress.
- Is a photographed signature legally ideal?
- Portals still ask for it. A scan on white paper is cleaner than a wooden-table photo.