SSC CGL Signature 4×2 cm in Pixels: 10–20 KB JPG Guide

If you are preparing a signature for an SSC CGL application, one of the most confusing questions is simple:

How many pixels is a 4 cm × 2 cm signature?

The answer is not one universal pixel number.

The applicable SSC CGL application instructions specify the scanned signature in JPEG/JPG format, with a file size of 10–20 KB and image dimensions of about 4.0 cm wide × 2.0 cm high. The instructions also warn against using a blurred signature.

However, centimetres cannot be converted into one fixed pixel size unless a resolution such as DPI or PPI is also chosen.

This distinction is important because many third-party pages publish pixel values without explaining the conversion behind them.

Quick Answer:

CGL signature instructions specify approximately 4 cm × 2 cm, JPEG/JPG and 10–20 KB.

A 4×2 cm image has a 2:1 aspect ratio.

At 300 DPI, 4×2 cm converts mathematically to approximately 472×236 pixels.

That 472×236 value is a technical conversion example, not an SSC-published CGL pixel requirement unless the application itself specifically gives that pixel size.

What Is the SSC CGL Signature Requirement?

For the applicable CGL application instructions, the important signature values are:

• Format: JPEG/JPG
• File size: 10 KB to 20 KB
• Physical dimensions: about 4.0 cm width × 2.0 cm height
• Quality: the signature should not be blurred

These values should be kept separate from specifications used by another SSC examination or another notification.

Do not assume that a signature size used for one SSC application automatically applies to every other SSC form.

Important: The Tool Above Opens with a Different Default

The tool above currently opens with a default profile of:

• 709 × 236 pixels;
• 6 cm × 2 cm;
• JPG/JPEG output;
• a generated JPG safety range below the usual 20 KB upper limit.

That default should not be treated as the CGL requirement simply because it appears first in the tool.

For a CGL form that states approximately 4×2 cm, use the Custom controls or another setting that corresponds to the requirement you are following.

The application instructions are more important than a website preset.

Why 4×2 cm Has a 2:1 Aspect Ratio

The aspect ratio is calculated from width divided by height.

For 4×2 cm:

4 ÷ 2 = 2

So the shape is:

2:1

This means the width should be approximately twice the height.

Any pixel dimensions that represent the same 4×2 shape without distortion should therefore also be approximately 2:1.

How Do You Convert 4×2 cm to Pixels?

To convert centimetres to pixels, you need a resolution value.

The standard mathematical relationship is:

Pixels = centimetres ÷ 2.54 × DPI

For example, if you intentionally use 300 DPI:

Width:
4 ÷ 2.54 × 300 ≈ 472 pixels

Height:
2 ÷ 2.54 × 300 ≈ 236 pixels

So:

4×2 cm at 300 DPI ≈ 472×236 pixels.

472 divided by 236 is exactly 2, so this also preserves the required 2:1 shape.

Is 472×236 Pixels the Official SSC CGL Pixel Size?

No—not unless the application or notification explicitly states that pixel value.

472×236 is the mathematical conversion of approximately 4×2 cm when using 300 DPI.

There is an important difference between:

“This is a mathematically correct conversion.”

and:

“SSC officially requires exactly these pixels.”

Do not treat those statements as the same.

If SSC provides exact pixel dimensions directly in the application, use those exact pixels.

If the official instruction provides centimetres but does not give a pixel value or required DPI, third-party websites should not invent an exact official pixel mandate.

Does SSC CGL Require 300 DPI?

The applicable CGL signature instruction specifies approximately 4×2 cm, JPEG/JPG and 10–20 KB, but it does not make a separate 300-DPI requirement part of that signature specification.

This matters because some SSC notices for other examinations may explicitly mention a resolution value such as 300 DPI.

Therefore, the safest wording is:

300 DPI can be used as a technical conversion reference, but it should not be described as a universal CGL requirement unless the applicable SSC instruction says so.

4×2 cm Pixel Examples at Different Resolutions

The same physical 4×2 cm size produces different pixel dimensions at different resolutions.

Resolution	Approx. 4×2 cm Pixels	Ratio
96 DPI	151 × 76 px	Approximately 2:1
150 DPI	236 × 118 px	2:1
200 DPI	315 × 157 px	Approximately 2:1
240 DPI	378 × 189 px	2:1
300 DPI	472 × 236 px	2:1

These values demonstrate why “4×2 cm in pixels” does not have one answer until a resolution is chosen.

Why 236×79 Pixels Is Not a Direct 4×2 cm Conversion

You may find pages online claiming that 236×79 pixels represents a 4×2 cm signature.

There is a basic mathematical problem with that statement.

4×2 cm has a ratio of:

2:1

But 236×79 pixels has a ratio of approximately:

3:1

Those are different shapes.

A 236×79 image is almost three times wider than it is tall, while a 4×2 cm image is twice as wide as it is tall.

Therefore, 236×79 cannot be a direct proportional pixel conversion of 4×2 cm.

If you force a genuine 2:1 signature into a 236×79 3:1 frame by stretching it, the handwriting shape changes.

What Is 236×118 Pixels?

At approximately 150 DPI:

4 cm ≈ 236 pixels

and:

2 cm ≈ 118 pixels

So 236×118 preserves the 2:1 shape of 4×2 cm.

This does not make 236×118 an official SSC CGL requirement either. It is simply another technically correct 4×2 conversion at a different resolution.

What About 472×236 Pixels?

472×236 is useful because it is approximately 4×2 cm at 300 DPI.

It preserves the 2:1 shape and gives the signature more digital pixel detail than a very small canvas.

If you choose to prepare the 4×2 cm shape using a 300-DPI conversion, 472×236 is mathematically consistent.

Again, treat it as a technical conversion rather than an official SSC pixel mandate unless the form itself provides the same value.

Why You Should Not Use 709×236 for a 4×2 cm CGL Signature

709×236 is approximately a 3:1 canvas.

That corresponds closely to a 6×2 cm shape at 300 DPI.

A 4×2 cm requirement is 2:1.

Therefore, using 709×236 simply because it is the tool's default would change the intended frame shape.

Do not confuse:

• 6×2 cm → 3:1
• 4×2 cm → 2:1

How to Prepare the CGL Signature with the Tool Above

1. Start with the Original Signature Image

Use the clearest source available.

The tool above can accept supported raster images and a suitable single-page PDF and creates the processed result as JPG/JPEG.

Prefer the original phone image or scan over a screenshot or repeatedly compressed copy.

2. Check the Original Preview

After uploading, inspect the signature itself.

Make sure:

• the first stroke is visible;
• the final flourish is visible;
• dots remain visible;
• underlines remain complete;
• the source is not already badly blurred.

3. Let Smart AutoDetect Find the Handwriting

Smart AutoDetect identifies the useful handwriting region and prepares a practical starting frame.

This is particularly helpful for phone photographs containing a large amount of surrounding paper.

Automatic detection should still be checked manually in the Original preview.

4. Correct the Crop When Necessary

If any genuine handwriting is too close to an edge, adjust the crop using the controls available in the Original preview.

Keep a small natural safety margin.

Do not crop so tightly that a dot, underline, loop or finishing stroke disappears.

5. Do Not Leave the 6×2 Default Unchanged

If you are preparing a CGL 4×2 cm requirement, the tool's 709×236 / 6×2 cm default is not the same shape.

Use Custom dimensions that preserve the 2:1 ratio.

6. If Using the 300-DPI Conversion, Enter 472×236

If you intentionally use the 300-DPI technical representation of 4×2 cm, the approximate Custom pixel values are:

• Width: 472 px
• Height: 236 px

This preserves the correct 2:1 ratio.

Remember: this is a mathematically derived example, not a claim that SSC publishes 472×236 as an exact CGL pixel requirement.

7. Set the File-Size Limit Correctly

The applicable CGL instruction specifies 10–20 KB.

Use a maximum file-size setting that keeps the final JPG inside the permitted range.

Do not judge the file by pixels alone.

8. Let the Result Refresh

Whenever you change:

• width;
• height;
• maximum KB;
• crop position;
• rotation;

allow the tool to generate the current result again.

Then inspect the refreshed output.

9. Check the Final Result

Before downloading, confirm:

• the final dimensions are the values you intended;
• the aspect ratio is 2:1 for a 4×2 cm representation;
• the file is JPG/JPEG;
• the final file size is inside the applicable range;
• the signature remains complete;
• the handwriting is not stretched;
• the result is not visibly blurred.

Pixels, DPI and KB Are Three Different Things

One of the main reasons signature-size advice becomes confusing is that three separate measurements are mixed together.

Pixels

Pixels describe the digital width and height of the image.

Example:

472 × 236 pixels

DPI

DPI or PPI is used when relating digital pixels to a physical measurement such as centimetres or inches.

Changing DPI changes the pixel count required to represent the same physical size.

KB

KB describes how much storage the compressed image file uses.

It is affected by:

• JPEG compression;
• pixel dimensions;
• background detail;
• camera noise;
• colour variation;
• image complexity.

Correct pixels do not automatically create the correct KB.

Can Two 472×236 Images Have Different KB?

Yes.

Two JPG files can both be exactly 472×236 pixels while having very different file sizes.

One may contain:

• a simple smooth background;
• a few clean dark strokes.

Another may contain:

• camera grain;
• paper texture;
• shadows;
• many colour variations.

The second image usually requires more compressed data.

This is why pixel dimensions and KB must be validated separately.

Does Increasing DPI Automatically Improve Signature Quality?

No.

Metadata or a higher calculated pixel count cannot recreate handwriting detail that the original image never captured.

If the source is blurred, changing a number to 300 DPI does not make the real pen strokes sharp again.

Use a clear original first.

Do Not Upscale a Tiny Signature Just to Reach 472×236

If your source is an extremely small thumbnail, enlarging it can create pixelation.

The final image may technically have the chosen width and height, but handwriting edges can become blocky.

Whenever possible, start from:

• the original camera photo;
• the original scan;
• a clear PNG;
• a clear WebP;
• a high-quality source PDF.

Why Correct Cropping Matters for 4×2 cm

The 4×2 cm frame is a wide landscape rectangle.

If your source photograph contains an entire sheet of paper, shrinking everything into that small output can make the signature miniature.

Crop the useful handwriting region first.

At the same time, do not crop directly against the ink.

The best frame contains:

• the complete signature;
• a small natural margin;
• little unnecessary distant paper;
• no missing strokes.

Do Not Stretch a 3:1 Signature into 2:1

If you already have an older 6×2 cm or 709×236 image, do not simply squeeze that completed JPG into a 4×2 cm frame.

That can distort the handwriting.

Return to the original source image and prepare the 2:1 crop again.

The handwriting should be fitted proportionally rather than squeezed.

Do Not Stretch a 2:1 Signature to Match 236×79

The same principle applies to third-party pixel recommendations.

If you have a correct 2:1 source and force it into 236×79, the output canvas is approximately 3:1.

Filling that frame by non-proportional scaling makes the signature unnaturally wide.

A technical number is not useful if achieving it requires distorting the handwriting.

What If the SSC Portal Gives Exact Pixels?

If the application portal itself displays an exact pixel width and height, use those values.

Official portal instructions take priority over:

• this article;
• a competitor website;
• a video tutorial;
• an old screenshot;
• a generic preset.

The tool above provides Custom width and height fields for cases where the applicable form gives a different output requirement.

What If the Portal Gives Only 4×2 cm?

If the applicable instruction gives approximately 4×2 cm but no exact pixel dimensions, do not treat a random third-party pixel pair as an official requirement.

You can use a technically consistent 2:1 representation while keeping the required JPG format and file-size range.

For example, 472×236 is a mathematically correct 300-DPI representation.

The important distinction is that the conversion is technical, while the official requirement remains the centimetre measurement stated by SSC.

Should You Use Exactly 10 KB or Exactly 20 KB?

No.

A 10–20 KB requirement is a range.

You do not need to force a clear image to exactly 10 KB or exactly 20 KB.

The final JPG should remain inside the range required by the application while preserving readable handwriting.

Can a Correct 10–20 KB File Still Be Wrong?

Yes.

A 15 KB JPG may still be:

• blurred;
• cropped;
• miniature;
• distorted;
• the wrong dimensions;
• the wrong aspect ratio.

File size is only one validation check.

Why Blur Must Be Checked Separately

Applicable CGL instructions warn against blurred signatures.

A signature may become blurry because:

• the camera did not focus;
• the phone moved;
• the source was too small;
• the image was repeatedly compressed;
• the signature occupied too little of a large photo.

Resizing cannot reconstruct real handwriting detail that was never captured.

If the original source is badly blurred, create a clearer source rather than relying on artificial sharpening.

Why the Tool Preserves the Original Appearance

The tool above is designed to prepare the existing signature rather than cosmetically redesign it.

It preserves the selected original pixels and natural background while performing the required processing.

It does not intentionally:

• whiten the paper;
• replace the natural background;
• change brightness;
• change contrast;
• recolour the handwriting;
• redraw strokes;
• apply artificial sharpening;
• stretch the signature.

This is useful when the goal is to change technical formatting without changing the handwriting itself.

Should You Make the Background Pure White?

Do not automatically modify the source only because another website says every signature background must be digitally whitened.

Follow the source-capture or background instruction given by the applicable SSC application.

If a better source is needed, capture the signature correctly rather than using aggressive digital whitening that changes the original image.

Can You Use a Phone Photo?

A clear phone photograph can provide a suitable source for the tool.

For a better result:

1. place the signed paper on a flat surface;
2. use bright, even light;
3. hold the phone reasonably parallel to the paper;
4. tap the signature to focus;
5. keep the complete handwriting inside the source image;
6. leave some natural paper around the edges;
7. avoid heavy digital zoom;
8. use the original image rather than a compressed messaging-app copy.

Can You Use PNG or WebP as the Source?

The tool above can accept supported raster source images such as JPG, PNG and WebP.

The final processed output is prepared as JPG/JPEG.

This is useful when your best original signature happens to be stored in PNG or WebP format.

Can You Use a PDF Source?

The tool above also supports a suitable single-page PDF as an input source.

If a clearer original image is available outside the PDF, the original raster file may be preferable because it avoids an unnecessary conversion step.

Why Local Browser Processing Matters

A handwritten signature is personal information.

The normal processing workflow on SSC Signature Resize runs locally inside your browser.

The selected file does not need to be sent to the website server merely for standard cropping, resizing and compression.

You should still use a trusted device and keep the final JPG securely stored.

For more information, read the Privacy Policy.

Common CGL Signature Size Mistakes

Mistake	Why It Is a Problem	Better Approach
Using 6×2 cm because it is a generic default	Applicable CGL instructions use about 4×2 cm	Use the applicable CGL requirement
Calling 236×79 a direct 4×2 conversion	236×79 is about 3:1, while 4×2 is 2:1	Preserve the 2:1 ratio
Calling 472×236 an official pixel rule	It is a 300-DPI mathematical conversion, not an official pixel mandate unless stated by SSC	Describe it as a technical conversion example
Ignoring KB after fixing pixels	Pixels and file size are separate	Verify the final 10–20 KB JPG
Stretching an old 3:1 signature	Handwriting becomes distorted	Return to the original and prepare a fresh 2:1 crop
Using a blurred original	Resizing cannot restore missing detail	Use a clearer photo or scan
Cropping directly against the ink	Dots and thin strokes may be cut	Keep a small natural safety margin

Complete SSC CGL 4×2 cm Workflow

1. Read the signature instructions shown in the CGL application.
2. Confirm the required JPG/JPEG format.
3. Confirm the required 10–20 KB file-size range.
4. Confirm the approximately 4×2 cm physical dimensions.
5. Start from your clearest original signature source.
6. Upload the source to the tool above.
7. Let Smart AutoDetect identify the handwriting area.
8. Check the complete signature in the Original preview.
9. Adjust the crop if any genuine stroke is too close to an edge.
10. Keep a small natural margin.
11. Do not leave the generic 6×2 default unchanged for a 4×2 requirement.
12. Use a Custom 2:1 output.
13. If using the 300-DPI mathematical representation, use approximately 472×236 pixels.
14. Do not call that pixel value an SSC mandate unless the form itself states it.
15. Set the maximum KB according to the application's limit.
16. Allow the processed result to refresh.
17. Check the final JPG dimensions.
18. Check the final file size.
19. Check that the complete handwriting remains visible.
20. Check that the signature has not been stretched.
21. Check that the result is not blurred.
22. Download the JPG.
23. Open the downloaded file once on your device.
24. Compare it with the CGL application instructions before final submission.

Final Checklist

• The file is JPG/JPEG.
• The final file size is inside 10–20 KB.
• The output uses the 4×2 cm shape required by the applicable CGL instructions.
• The output ratio is 2:1.
• You did not automatically use a 6×2 cm / 3:1 preset.
• You did not treat 236×79 as a direct 4×2 conversion.
• You understand that 472×236 is an approximate 300-DPI conversion, not automatically an official pixel requirement.
• The complete first stroke is visible.
• The complete final flourish is visible.
• Dots and underlines remain complete.
• A small natural safety margin remains.
• The signature is not miniature.
• The signature is not stretched or squeezed.
• The source is not visibly blurred.
• The downloaded JPG has been checked before submission.

Frequently Asked Questions

What is the SSC CGL signature size?

The applicable CGL application instructions specify a scanned signature in JPEG/JPG format, 10–20 KB, with image dimensions of about 4.0 cm wide × 2.0 cm high.

What is 4×2 cm in pixels?

There is no single pixel answer without choosing a DPI or PPI value. At 300 DPI, 4×2 cm converts mathematically to approximately 472×236 pixels.

Is 472×236 the official SSC CGL pixel size?

It should not be described as an official pixel mandate unless SSC explicitly states that value in the applicable form. It is a mathematical 4×2 cm conversion at 300 DPI.

Is 236×79 pixels equal to 4×2 cm?

Not as a proportional conversion. A 4×2 cm image has a 2:1 ratio, while 236×79 is approximately 3:1.

What is 4×2 cm at 150 DPI?

It is approximately 236×118 pixels, which preserves the 2:1 aspect ratio.

Does SSC CGL require 300 DPI?

The applicable CGL signature instruction specifies about 4×2 cm, JPEG/JPG and 10–20 KB but does not state 300 DPI as part of that specific signature requirement. Use 300 DPI as a conversion reference only when appropriate unless the application explicitly requires it.

Why does the tool above show 709×236 by default?

The current default tool profile corresponds to approximately 6×2 cm, which is a 3:1 shape. A 4×2 cm CGL requirement is 2:1, so the default should not be used blindly.

Can I enter 472×236 in the Custom fields?

If you intentionally want the 300-DPI mathematical representation of a 4×2 cm, 2:1 image, 472×236 is a consistent Custom value. Always compare the final result with the instructions shown by SSC.

Does a 472×236 JPG automatically become 10–20 KB?

No. Pixel dimensions and compressed file size are separate. The final JPG file size must be checked independently.

Should the signature be exactly 20 KB?

No. When the permitted range is 10–20 KB, the file simply needs to remain inside that range.

Can I resize an old 709×236 signature to 472×236?

Using the original source is safer. Directly squeezing a completed 3:1 image into a 2:1 frame can distort handwriting.

Can I use a phone photo?

Yes. Use a clear, focused original image with the complete signature visible and enough natural paper around it for safe cropping.

Can I upload PNG to the tool?

The tool above supports common raster source formats such as PNG, JPG and WebP and prepares the processed output as JPG/JPEG.

Can the tool use a PDF signature?

A suitable single-page PDF can be used as a source. If a clearer original image exists, using the original raster source may be preferable.

Does the tool whiten my signature background?

No. The tool is designed to preserve the selected original pixels and natural background rather than automatically whitening or replacing the source background.

Does the tool sharpen or redraw handwriting?

No. It does not intentionally redraw or artificially sharpen the signature. If the source is badly blurred, use a clearer original.

Is my signature uploaded to the website server?

The normal image-processing workflow is designed to run locally inside the browser, so the selected signature does not need to be sent to the website server for standard resizing and compression.

More SSC Signature Help

Use the SSC Signature Resize tool to prepare the signature from your clearest original source.

You can browse more SSC Signature guides for help with cropping, image quality and upload preparation.

For additional resizing guidance, browse the Signature Resize guides.

For information about browser-based processing, read the Privacy Policy. You can learn more about this independent utility on the About Us page.

Conclusion

The SSC CGL signature requirement becomes easier to understand once centimetres, pixels, DPI and KB are treated as separate measurements.

An approximately 4×2 cm signature frame has a 2:1 aspect ratio.

There is no single universal pixel value for 4×2 cm unless a resolution is selected. At 300 DPI, the mathematical conversion is approximately 472×236 pixels. At another resolution, the pixel dimensions change while the physical 4×2 cm size remains the same.

This is why a third-party value such as 236×79 should not automatically be called a 4×2 cm conversion. Its shape is approximately 3:1, not 2:1.

For the safest workflow, start with the clearest original signature, preserve every handwriting stroke, use a 2:1 crop, choose the dimensions appropriate to the instructions you are following, create the required JPG and verify that the final file remains inside the permitted size range.

The tool above currently opens with a 6×2 cm default, so do not assume that default is correct for a CGL form specifying about 4×2 cm. Use the available Custom settings when another output is required.

Most importantly, treat the SSC application or notification as the final authority. A website tool can perform the technical conversion, but it should not replace the instructions issued for the application you are actually submitting.

SSC Signature Resize is an independent browser-based image utility and is not affiliated with, endorsed by, sponsored by or operated by the Staff Selection Commission or the Government of India.