Skip to content
DYNAMB

Signature resizer for online forms

Application forms almost always want the signature as a separate file, smaller than the photograph and often between 10KB and 20KB. This signature resizer hits that band exactly, including the minimum size that trips up so many uploads.

  • No upload — files stay on your device
  • Works offline once loaded
  • Free forever, no signup, no watermark
Drop a photo here, or tap to choose JPG, PNG, WebP or HEIC from your phone — nothing is uploaded
Target file size
Custom target (KB)
Width (px, optional)
Height (px, optional)

{{ note }}

Finding the best quality that fits {{ targetLabel }}…
Result preview Resized photo preview
  • Original {{ sourceSizeLabel }}
  • Now {{ resultSizeLabel }}
  • Saved {{ savedPercent }}%
  • Pixels {{ resultWidth }}×{{ resultHeight }}

Within your {{ targetLabel }} target.

{{ hint }}

How to use this tool

  1. Photograph or scan your signature

    Sign on plain white paper in black or blue ink, then photograph it in good light or scan it. Add that file here.

  2. Pick the size your form wants

    Most forms ask for 10–20 KB. The range preset guarantees the file is above the minimum as well as below the maximum.

  3. Download the signature file

    Check the preview is legible, then download the JPEG and upload it in the signature field of your form.

Questions people ask

How do I resize my signature for an exam form?

Upload a clear photo of your signature on white paper, choose the 10–20 KB range preset, and download the result. The default pixel size of 140×60 matches what most Indian exam portals expect.

My form rejects the file for being too small. Why?

Many portals enforce a minimum size as well as a maximum, so a file compressed to 4KB fails even though it is well under the cap. Use a range preset such as 10–20 KB and the tool pads the file so it sits inside the band.

Is my photo uploaded to a server?

No. The resizing happens inside your own browser using the Canvas API, and this site has no upload endpoint at all. You can switch off your internet connection after the page loads and the tool still works.

Will resizing to a small KB size ruin my photo?

Quality does drop as the file gets smaller, but the tool searches for the highest JPEG quality that still fits your target instead of guessing. The preview shows exactly what you are about to download, so you can judge it before saving.

Can I set the pixel width and height as well as the KB size?

Yes. Enter a width and height and the photo is resized to those dimensions first, then compressed to your KB target. Leave them blank to keep the original proportions.

Does it work on a phone?

Yes. Tapping the drop zone opens your camera or gallery, and the download works the same way it does on a desktop. Most forms are filled on a phone, so the tool is built for that first.

Related tools

Free because it costs us nothing to run: your browser does the work, not our servers. Made by Dynamb Technologies — we build software for businesses.