Signature guide
How to scan or photograph a signature for online forms
Signature uploads fail for predictable reasons: lined paper, faint ink, huge empty margins, glare, and file sizes above a 20 KB cap. A good signature image is simply dark strokes on a clean white field at the exact wide dimensions the portal requests.
You do not need specialized equipment. A careful phone photo or flatbed scan, followed by a tight crop and gentle compression, is enough for most exam, recruitment, and banking forms.
Write for the camera
Sign on plain unlined white paper with a dark blue or black pen. Press firmly enough for continuous strokes. Avoid pencil and light gel pens that disappear after JPG compression.
Sign larger than the final upload box. It is easier to shrink a clear signature than to enlarge a tiny one without blur.
Scan or photograph correctly
For photos, place the paper flat, shoot from directly above, and use even light without a harsh flash hotspot. Keep the phone parallel to the page so the signature is not skewed.
For scans, use a modest resolution that still shows clean edges—extremely high DPI files only make compression harder later. Save or export a lossless or high-quality original before editing.
Crop for wide signature boxes
Most portals use a wide, short frame such as 140 x 60 pixels. Crop so the full signature sits horizontally with a small white margin on all sides. Do not rotate the signature on a diagonal to fill space.
Remove table texture, other handwriting, and printed letterheads from the frame. Extra background noise increases file size and distracts reviewers.
Contrast and compression
If strokes look grey, increase contrast before final export so ink becomes clearly darker than the paper. Then resize to the required pixels and compress under the KB limit.
Zoom to 100% after download. Loops and end strokes should remain connected. Speckled or broken lines mean you need a cleaner source or milder compression.
Privacy note
Your signature is sensitive. Prefer tools that process the image in the browser, download the result locally, and upload it only to the official portal that requested it. Avoid posting signature images on public chat threads.