Signature Resizer

Resize a scanned signature to exact form sizes — 50×20mm or 6×2cm at 300 DPI. Pick a size, upload, download. Free and private.

Your files never leave your device — all processing happens in your browser.
Pre-set to 591 × 236 px (50 × 20 mm) — you can change it anytime.

Drop your image here

or browse files — JPG, PNG, WebP

Output: —

Your resized image is ready

Original
—
Resized
—
Resized image preview

How it works

1

Upload

Scan or photograph your signature on plain white paper, then drop the file into the box above.

2

Resize

Pick your required size from the dropdown (50×20mm or 6×2cm), then hit Resize & download.

3

Download

Check the preview — the signature should sit cleanly inside the box — then download.

Why signatures need exact sizes

Job applications, exam forms and government portals specify signature boxes in millimeters — commonly 50×20mm or 6×2cm. Upload a wrongly-sized signature and the portal either rejects it or squishes it into the box. At 300 DPI, 50×20mm equals 591×236 px and 6×2cm equals 709×236 px — pick yours from the dropdown above.

For the cleanest result, scan on plain white paper at 300 DPI or higher. PNG keeps thin pen strokes crisp; this tool saves PNGs as PNG automatically.

Tips

  • Scan on white paper. A clean white background scans best — avoid ruled notebook paper, the lines survive resizing.
  • PNG keeps strokes crisp. Photograph or scan as PNG when you can; thin pen lines stay sharp instead of JPEG-smudging.
  • Don’t upscale tiny signatures. Enlarging a small signature softens the strokes — scan at 300 DPI or higher to start big.
  • Crop tight first. Trim empty paper around the signature before resizing so it fills the mm box properly.
  • Match the form’s box. Measure the signature box on the form — 50×20mm and 6×2cm look similar but are not interchangeable.

Common uses

  • Job applications — signatures boxes on online recruitment forms.
  • Exam forms — admit cards and answer-sheet declarations with mm specs.
  • Bank & KYC uploads — signature specimens at exact dimensions.
  • Rental & legal agreements — e-sign boxes on document portals.

Frequently asked questions

Which size do I need — 50×20mm or 6×2cm?

Check the form’s instructions. 50×20mm (591×236 px) is the most common; 6×2cm (709×236 px) is slightly wider. Pick from the dropdown above.

JPG or PNG for signatures?

PNG. Thin pen strokes stay crisp in PNG; JPEG compression smudges them. This tool keeps PNGs as PNG.

Can I make the background transparent?

No — this tool resizes only. Scan on white paper; most forms expect a white background anyway.

My signature looks blurry after resize.

It was likely upscaled from a tiny scan. Re-scan at 300 DPI or higher and resize down instead — downscaling stays sharp.

Will the portal accept this file?

The dimensions will match the mm spec exactly at 300 DPI. Portals may also have file-size limits — compress afterwards if needed.