Step by step
- 01
Capture more detail than the final placement needs
A clear source gives the PDF renderer enough information for smooth strokes. Soft focus, motion blur, and shadows cannot be repaired just by increasing pixel dimensions.
- 02
Match the line, not an arbitrary pixel number
PDF pages use their own coordinate system. Resize the placed signature visually so it fits the intended line without covering nearby labels or dates.
- 03
Avoid extreme enlargement
If the ink looks jagged or fuzzy after placement, return to a sharper source instead of stretching a small image further.
- 04
Inspect the exported file
Open the final PDF at normal reading size and zoom in once. Check that thin strokes remain visible and that the signature is not clipped or placed on the wrong page.
Quality matters more than one magic number
- Keep the original high-quality capture.
- Resize the placement non-destructively inside the document.
- Judge the exported PDF, not only the editing preview.
Questions
Is there a standard pixel size for a PDF signature?
No. The right size depends on the page, signature line, source quality, and export settings.
Why does a large image still look blurry?
Its pixels may already contain blur or compression artifacts. Larger dimensions do not restore lost detail.
Should I crop close to the handwriting?
Yes. Removing excess paper makes placement and sizing easier, as long as no ink strokes are clipped.