Signature Resizer — Under 50 KB

Why form signatures fail at upload

Upload fields that ask for a signature usually cap the file far below what a phone camera produces. A full-width scan of paper can easily be 2–4 MB, while the field may accept only 50 KB or 100 KB. The fix is rarely "compress harder" — a signature is mostly black strokes on white paper, so what actually matters is the pixel area of the scan, not the quality slider. Cropping away empty margins around the ink gives the encoder far fewer pixels to describe, so the same 50 KB budget buys sharper strokes instead of blurry paper.

That is why this page pre-fills a wide 1200 × 400 crop: it matches the shape of a handwritten signature and spends the file-size budget on the ink. If your form specifies different pixels or a different limit, change either value in the editor after upload — the target-size search adapts to whatever you set. For a full walkthrough of the resize step, seeresizing images to exact dimensions; for the underlying mechanics of JPEG quality, the 3-step compression guide explains the trade-offs.

• Crop tight to the ink — empty paper is wasted bytes.
• Scan on a plain background — texture and shadows eat the size budget.
• Check the preview before downloading — broken strokes mean the target is too tight; relax it slightly or use Fit inside.