Resize Signature to 10KB

How to use this tool

1. Choose your photograph, or drag it onto the box above. It is cropped to fill 140 × 60 px from the centre — never stretched, so faces keep their proportions.
2. There is nothing to set. This page is already fixed at 140 × 60 px, under 10.0 KB, JPEG.
3. It crops to exactly 140 × 60 px without stretching anything, then adjusts quality until the file fits.
4. Check the output dimensions read exactly 140 × 60 px, then download. If the size limit could not be met at those fixed dimensions, the panel says so rather than quietly shrinking the image.

The 140 × 60 pixel box is close to a 7:3 ratio. Cropping your scan to roughly that shape before uploading gives a much cleaner result than letting a square image be squeezed into it.

Resize Signature to 10KB — the specification

Resize Signature to 10KB: why uploads get rejected

Getting under the limit is the easy half. The 140 × 60 pixel box has to be right as well, and several other things are checked before a human sees the file:

• The scan includes a large white margin, so the mark itself ends up tiny inside the 140 × 60 box. Crop tight first.
• The signature is in capital letters. IBPS and SBI reject block capitals explicitly.
• The background is grey because it was photographed under a lamp rather than scanned. Portals check for a clean white background.
• The file is below the minimum in the permitted range. A file compressed to 3 KB when the rule says 10–20 KB fails just as surely as one at 40 KB.

How it works

Hitting a size limit exactly is a search problem, not a setting. There is no quality value that means “10.0 KB” — how many bytes a given quality produces depends entirely on the picture. So this tool encodes, measures the real file, and adjusts.

Here the dimensions are fixed at 140 × 60 px by the specification, so scaling is not available as a lever. Everything has to come from the quality setting, and the tool reports honestly when the two requirements cannot both be met.

Where the first attempt already fits — as it did on the reference file below, at 6.1 KB — the search stops immediately rather than compressing further for no reason.

The crop, the resize and every encode happen on your own device through the browser’s canvas API. A photograph for an official form is not a file worth handing to someone else’s server, and this page never receives it.

A measured run of this exact preset

Not an estimate: this page’s own code, run against a scanned signature and a 12.2 MP photograph, with every encode recorded. The files and the method are published here.

Step by step

The dimensions here are fixed by the specification (140 × 60 px), so the image cannot be scaled to help. The file size has to come from quality alone.

The first attempt, at quality 0.96, produced 6.1 KB — already inside the 10.0 KB allowance, so no search was needed. One encode and it was done.

Final file: 6.1 KB, using 61.3% of the allowance, with 3.9 KB to spare.

The two inputs do not behave the same way, and the gap is the useful part: the scanned signature finished 2.5× larger than the 12.2 MP photograph under the same settings. Detail costs bytes. If your own file is flat — a scan, a screenshot, a document photographed straight on — expect results nearer the 12.2 MP photograph row.

Who needs Resize Signature to 10KB

Nearly every Indian competitive exam — SSC, IBPS, SBI, RRB, the state PSCs — asks for a scanned signature in a 140 × 60 pixel box within a narrow file-size range. One correctly prepared file usually serves an entire application season.

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Background reading: Photo and Signature Sizes for Every Major Indian Exam