Signature Resizer for Exam and Government Forms
Crop a photo or scan of your signature to the exact pixel size and KB limit your exam or portal asks for, with an ink cleanup that lifts grey paper toward white. Six presets plus a free-form custom size, and a UPSC three-signature stack builder. Everything runs in your browser and your signature never leaves your device.
Drag & Drop your signature here
or
Import from your computer, a public URL, Google Drive, or Dropbox.
JPG, PNG, WebP, HEIC - up to 100MB per file, 100 files per batch
Crop tight to the signature with a small white margin, and keep it level. If you signed on ruled paper, crop so the lines are outside the frame.
Trim to signature finds the darkest region and crops to it. It does not detect handwriting. Check the box it picked before you export, and drag it yourself if it guessed wrong.
Add three signatures to build the stack.
UPSC has required three signatures stacked on white paper and scanned as one image. The exact canvas size is not stated consistently across sources, so the default is editable. Confirm against the current notification PDF before you upload.
Each signature is fitted inside its own band and never stretched. Where a crop does not fill its band the leftover is white, which is invisible against a white canvas.
Width and height accept 60 to 4000 px. The target accepts 1 to 5000 KB. The DPI tag is 300.
Signature specs change with every notification cycle and different sources print different numbers for the same exam. Confirm the exact pixel size and KB limit on your exam's official notification PDF before uploading. Use the Custom preset when your notification says something not listed here.
Width and height accept 10 to 5000 px. The target accepts 1 to 5000 KB. Zero, negative, decimal and empty values are refused rather than guessed at. The crop box locks to the ratio of the width and height you type.
Type the numbers your own notification PDF states. The DPI tag on a custom size is 300, which changes nothing on a pixel-and-KB upload spec.
This looks like a photo of paper rather than a scan. Ink cleanup will help.
Cleans the paper background and darkens the ink. It does not redraw your signature, it cannot rescue a blurred or smudged one, and at full strength it will thin delicate strokes.
It starts off and stays off until you move it. Nothing is ever applied to your pixels without you asking.
This tool cannot check - your responsibility
Sign on plain unlined white paper in black or blue ink and photograph it square on. If you signed on ruled paper, crop so the lines are outside the frame. The tool cannot remove them.
DPI is metadata. On a pixel-and-KB upload spec it changes nothing. It matters only on the two presets stated in millimetres.
Output is always JPEG, because that is what portals accept. Re-encoding strips EXIF and GPS metadata after baking in the camera's rotation tag, which means smaller files and more privacy. This tool does not remove or replace backgrounds, does not verify signatures and makes no automatic compliance claim; it checks what it can and reports the rest honestly.
UCT Tools is not affiliated with, endorsed by or connected to UPSC, SSC, IBPS, SBI, the Income Tax Department or any government body.
Everything runs in your browser. Your signature is never uploaded to our servers and never leaves your device.
This signature resizer crops your signature to the exact pixel size your exam or portal asks for, cleans up the paper behind it, hits the KB range in whichever direction it needs to move, and does all of it inside your browser. Five presets cover UPSC, SSC, banking and PAN, plus a custom size for the notification that says something none of them match.
Signature uploads fail for reasons that photo uploads never do, and the biggest one runs backwards. A signature is a few thousand dark pixels on a field of white paper, so JPEG compresses it to almost nothing. At 140x60 pixels a banking signature lands at two or three KB against a 10 KB minimum. Compressing harder makes it worse. This tool raises quality to reach the floor and reports the number it actually got, and it will not pad the file with meaningless bytes to fake a size that a portal is about to check.
The second problem is the input itself. Almost nobody has a scanner, so the real file is a phone photo of a whole A4 sheet with a signature somewhere in the middle, on paper that photographs grey. Trim to signature finds the darkest region and moves the crop box to it, so you are not dragging a tiny box across a full page. Ink cleanup lifts the paper to pure white and deepens the ink without shifting its hue, so a blue-black pen stays blue-black rather than turning grey. Both are off until you ask for them.
Stack mode handles the UPSC requirement for three signatures on white paper scanned as one image. Load three, crop each one, and the tool composes them onto a single canvas with even bands, fitting each inside its band rather than stretching it. The canvas size is a typed field because published UPSC figures disagree with each other, so the default is a starting point rather than a claim.
Every preset carries its own line telling you to check the current notification, and that is not boilerplate. Signature specs shift with each cycle and different sources print different numbers for the same exam. Use the custom preset whenever your notification says something the presets do not.
If your form wants a photograph as well as a signature, exam form photo carries the UPSC, SSC and IBPS presets for both in one place. For the PAN signature specifically, PAN card photo handles it alongside the 25x35mm photo on the same application. The identity document photos have their own pages: passport photo and Aadhaar photo. All of them sit under government photo tools.
When the requirement is a plain number with no exam attached, the simpler tools are quicker. Image resizer sets any width and height, resize image to KB targets a weight, crop image does free cropping with no preset, and DPI changer sets a density on a file you already have. Those live under image resize and DPI tools.
Trim to Signature
Finds the darkest region of a full-page photo and moves the crop box there. It refuses rather than guessing when there is no clear signature to find.
Ink Cleanup That Keeps Hue
Lifts greyish paper to pure white and deepens the ink, scaling all three channels equally so a blue-black pen stays blue-black rather than going grey.
It Fixes the Floor, Not Just the Cap
Signatures compress below their minimum. Quality is raised to reach it and the real figure reported, never padded with junk bytes to fake a number.
UPSC Three-Stack
Three signatures composed onto one white canvas with even bands, each fitted inside its band rather than stretched. Canvas size is editable.
How to Resize a Signature for an Exam Form
Read the notification first. Pixel size and KB range are two separate rules, they differ by exam and by cycle, and both are checked on upload.
1. Sign and Photograph
Plain unlined white paper, black or blue ink, running hand. Photograph it square on in good light. If you used ruled paper, plan to crop the lines out.
2. Pick the Preset
UPSC, SSC, banking or PAN. The crop shape locks to it immediately. Use Custom when your notification states a size none of them match.
3. Trim and Clean
Trim to signature jumps the crop box to the ink. Nudge it if needed, then raise ink cleanup if the paper came out grey rather than white.
4. Check and Download
Read the verified panel for dimensions, size, format and DPI. If the file landed under the minimum, the tool says so with the real number.
Signature Resizer Presets, Exam by Exam
There is no before-and-after slider on this page. Cropping and resizing changes the frame, not the handwriting, so two versions side by side would prove nothing. Here is the reference table instead, and every value is what the tool actually writes.
| Preset | Output | Crop shape | File size rule | DPI tag | Ink cleanup |
|---|---|---|---|---|---|
| UPSC square | 350 x 350 px JPEG |
1:1 locked | Targets 60 KB 20 to 100 KB |
300 | Yes |
| UPSC wide | 400 x 100 px JPEG |
4:1 landscape | Targets 60 KB 20 to 100 KB |
300 | Yes |
| SSC signature | 315 x 157 px 40 x 20 mm |
2.006 landscape | Targets 15 KB 10 to 20 KB |
200 | Yes |
| PAN signature | 354 x 157 px 45 x 20 mm |
2.255 landscape | Targets 45 KB 40 to 50 KB |
200 | Yes |
| Banking (IBPS / SBI) | 140 x 60 px JPEG |
2.333 landscape | Targets 15 KB 10 to 20 KB |
300 | Yes |
| Custom | Any px you type it |
Follows your size | Your KB target | 300 | Yes |
Why the crop shape is a decimal. Every ratio here is the output width divided by the output height, taken from the pixels rather than the millimetres. SSC is cited as 40 x 20 mm, which is exactly 2.000, but at 200 DPI that rounds to 315 x 157 pixels, which is 2.006. Locking the crop to 2.000 would stretch every SSC signature by a third of a percent. Nobody would see it and it would still be wrong. These figures are commonly cited values, not permanent rules, so confirm against your exam's notification PDF, and use the Custom preset when it says something else.
What a Signature Resizer Has to Solve That a Photo Tool Does Not
Every image tool assumes the file starts too big and works downward. A signature breaks that assumption completely. It is a few thousand dark pixels on a field of white paper, and JPEG compresses that kind of content to almost nothing. At 140 by 60 pixels a banking signature lands at two or three kilobytes against a ten kilobyte minimum, and compressing harder only makes the gap worse.
So the fix runs in the opposite direction. Quality has to be raised, not lowered, until the file is heavy enough to clear the floor. This tool searches upward past its normal ceiling to do that, and then tells you the quality it settled on. What it will not do is append meaningless bytes to inflate a file to a target. That would satisfy a size check while producing something no honest tool should hand a person filing a government form, and it is the single most common shortcut in this category.
The second problem is the input. Almost nobody filling in an exam form owns a scanner, so the real file is a phone photograph of an entire A4 sheet, taken in whatever light was available, on paper that comes out grey rather than white. Two features exist purely because of that. Trim to signature scans for the darkest region of the frame and moves the crop box there, so you are not dragging a tiny rectangle across a full page. Ink cleanup lifts the paper to pure white and deepens the stroke. Both are off until you ask for them, and both refuse quietly rather than guessing when the input does not support them.
Underneath all of it is a moving target. Signature specifications change with each notification cycle, and different sources print different numbers for the same exam in the same year. That is why every preset carries its own line pointing at the official notification, and why a custom size is a first-class option rather than a fallback. Check the current requirement on the UPSC notifications page or the equivalent for your exam before you upload anything, including anything prepared here.
⚖ Signature Against Photograph: Opposite Problems
| Property | Signature upload | Photograph upload |
|---|---|---|
| Typical orientation | Landscape, or square for UPSC | Portrait |
| Image content | Mostly white, a little ink | Continuous tone throughout |
| Usual failure | File too light | File too heavy |
| Correct fix | Raise quality | Lower quality |
| Head guides useful | No | Yes |
| Ink cleanup useful | Yes | No |
| Which tool | This page | Exam form photo |
The row that matters is the fix. A tool that only knows how to compress will hand you a twelve kilobyte signature against a forty kilobyte minimum and report success, because from its point of view the target was met from below. Reading the result panel rather than trusting the download is the habit worth building, on this site and everywhere else.
🎯 When to Use a Named Preset
Your Notification Matches One
UPSC at 350 square or 400 by 100, SSC at 40 by 20 millimetres, banking at 140 by 60, PAN at 45 by 20. If the numbers on your form match, the preset carries the KB range and the DPI tag with them.
You Want the KB Range Handled
Each preset knows its floor as well as its ceiling. That matters more than the pixel size, because the floor is the rule most tools ignore entirely.
The Spec Is in Millimetres
SSC and PAN are stated in centimetres, so those two presets tag 200 DPI, which is what makes them print at the stated physical size. The rest are pixel specs where the tag changes nothing.
You Want the Shape Locked
The crop ratio is derived from the output pixels, so a landscape signature cannot accidentally be cropped square and then squashed to fit on the way out.
✏ When to Use Custom Instead
The Notification Changed
Specs shift every cycle. Six hardcoded values are stale the moment a new notification lands, so typing the numbers your form actually states is the reliable path.
A State or University Portal
State PSCs, university admissions and recruitment boards each set their own figures, and almost none of them match the national exams. Custom covers all of them.
Sources Disagree
When two guides give different numbers for the same exam, believe the notification PDF and type what it says rather than picking whichever preset looks closest.
You Need an Odd Shape
Custom takes any width, height and KB target within sane limits, and the crop locks to whatever ratio those numbers imply. The rest of the pipeline is unchanged.
✨ What This Tool Does Differently
It Will Not Fake a File Size
When a signature genuinely compresses below its stated minimum, you get the real number and an explanation, not a padded file engineered to slip past a byte count.
Your Signature Stays Yours
Canvas and JavaScript in your own browser. A specimen signature is a security credential, and uploading one to a stranger's server for a resize is a poor trade.
Automation That Refuses
Trim to signature declines when it cannot find a clear dark region rather than cropping noise. An auto-crop that quietly cuts off a surname is worse than none.
The UPSC Stack, Properly
Three signatures composed onto one canvas with each fitted inside its band rather than stretched to fill it, on an editable canvas because the published size is not consistent.
📋 Everything the Tool Does
- ✓ Six presets covering UPSC square and wide, SSC, PAN, banking and a fully custom size
- ✓ Crop ratio derived from the output pixels, so nothing is ever stretched to fit
- ✓ Trim to signature, which moves only the crop box and refuses when it cannot find clear ink
- ✓ Ink cleanup that scales all three colour channels equally, so the pen colour survives
- ✓ A hint suggesting cleanup when the paper reads grey, which never turns it on for you
- ✓ UPSC three-signature stack mode with even bands and an editable canvas size
- ✓ Quality lowered toward a ceiling and raised toward a floor, whichever the file needs
- ✓ DPI written into the JFIF header and verified by reading the finished bytes back
- ✓ JPG, PNG, WebP and HEIC input at up to 100 MB per file, decoder fetched only when needed
- ✓ Batch processing with a filmstrip switcher, ZIP download, re-run and per-item retry
🔢 Step by Step
- Sign it properly before you photograph it Plain unlined white paper, black or blue ink, running hand rather than block capitals. Ruled paper is the most common avoidable problem, because no tool can remove the lines afterwards.
- Photograph square on, in good light Hold the phone parallel to the paper rather than at an angle. A skewed photograph gives a skewed signature, and the crop box cannot rotate the content back for you.
- Pick the preset, then trim Selecting a preset locks the crop shape. Trim to signature then jumps the box to the ink, and you nudge it from there rather than dragging across a whole page.
- Clean up only if it needs it A clean scan needs nothing. If the paper came out grey, raise the cleanup slider until the background goes white, then stop. Pushed to full it will thin delicate strokes.
- Read the result before you upload Check the dimensions and the file size against your notification. If the tool says the file landed under the minimum, that is information you need before the portal tells you.
⚙ Technical Notes and Honest Limits
No handwriting detection, no signature verification, and no claim that a file will be accepted. What follows covers the three pieces of this pipeline that behave unlike anything else on the site, and the one limitation people most often hope has been solved.
JPEG spends its bytes on detail, and a signature has almost none. Most of the frame is one flat colour, so the encoder describes it in very little data and the finished file lands far below the minimum a portal expects. The tool handles this by probing maximum quality first: if that is still under the floor, it searches between its normal ceiling and absolute maximum for the largest encode it can produce, and reports the raised quality on the result. When even maximum quality cannot reach the floor, it says so plainly and offers the file anyway, because your portal may well accept it. The alternative, appending filler bytes, would produce a technically compliant file that is quietly dishonest, and this tool does not do it.
It scans the decoded image for pixels below a luma threshold, builds the bounding box that contains them, adds a small margin, and expands that box to satisfy the preset's locked aspect ratio. It moves the crop box only. Your image is never altered, and you can drag afterwards. Two guards stop it doing damage: if the detected region covers almost the whole frame, or if too few pixels are dark enough to be a signature, it leaves the box alone and tells you to crop manually. A blank sheet, a dark photograph or a page of printed text all fall into one of those cases. It finds ink, not handwriting, and it has no idea whether what it found is your name.
Two operations, one slider, and at zero nothing is touched. Pixels below a luma threshold are scaled toward black with all three colour channels scaled by the same factor, which is what keeps a blue-black pen blue-black instead of turning it grey. Pixels above a second threshold become exactly pure white, lifting photographed paper off its natural grey. Midtones between the two thresholds are never modified, and both ends ramp over a window proportional to the slider so antialiased stroke edges do not develop a hard staircase. The cost is real at high settings: thin strokes and the light ends of a flourish sit in the same tonal range as dirty paper, so pushing the slider to full can erode them. Raise it until the background is white, then stop.
Three things this tool genuinely cannot do, so they are worth getting right before you photograph anything. Ruled lines cannot be removed: they sit in the same tonal range as the ink, so any filter aggressive enough to erase them takes parts of your signature with it. Crop them outside the frame instead. Skew cannot be corrected: a photograph taken at an angle produces a signature that leans, and rotating in ninety degree steps does not fix a five degree tilt. Hold the phone parallel to the page. And a blurred or smudged signature cannot be sharpened into a clean one; the information is not in the file to recover.
💡 Real Situations This Solves
A portal rejecting a signature for being under the minimum size. The image looks fine, the dimensions are right, and compressing it further, which is what every other tool offers, moves it further from the target rather than closer.
A UPSC application on the last evening before the deadline, needing three signatures stacked on one sheet, with no scanner and no printer to lay them out on paper first.
A photograph of a full A4 page where the signature occupies a small patch in the middle. Cropping that by hand to an exact ratio on a phone screen is fiddly enough that people give up and submit the whole page.
A state PSC form specifying a size no national exam uses. Six presets do not help; a box to type the numbers into does, and it takes the same KB handling as the named ones.
🧰 Related Image Tools
Built for Everyone in India
Anyone whose application is blocked on a signature upload that is the wrong shape, the wrong weight, or on paper that photographed grey.
FAQs - Signature Resizer
What size should a signature be for an exam form?
▼It depends entirely on the exam. UPSC is commonly cited at 350 by 350 or 400 by 100 pixels, SSC at 40 by 20 millimetres which is 315 by 157 pixels, banking exams at 140 by 60, and PAN at 45 by 20 millimetres. Those figures shift with each notification cycle and different sources disagree, so check your notification PDF and use the custom preset if it says something else.
Why is my signature file below the minimum size?
▼Because a signature genuinely compresses that small. It is a few thousand dark pixels on a field of white paper, and JPEG spends its bytes on detail, so the finished file often lands far under the stated floor even at maximum quality. The fix is to raise quality rather than compress further. This tool does that automatically and reports the quality it settled on.
Can I make the file bigger to meet a minimum size?
▼Only honestly. The tool raises JPEG quality as far as it can, which genuinely adds data to the file, and reports the result. It will not append meaningless filler bytes to inflate a file to a target. That would pass a byte count while producing something no honest tool should hand you, and if the floor still cannot be reached the tool says so and offers the file anyway.
How do I get a signature from a photo of a full page?
▼Use Trim to signature. It scans the image for the darkest region, builds a bounding box around it, adds a small margin and moves the crop box there, expanded to match the preset's shape. Your image is not altered and you can drag afterwards. If it cannot find a clear dark region it leaves the box alone and tells you to crop manually rather than guessing.
What does the ink cleanup slider actually do?
▼Two things, and at zero it changes nothing. Dark pixels are scaled toward black with all three colour channels scaled equally, so a blue-black pen stays blue-black rather than turning grey. Near-white pixels become pure white, which lifts photographed paper off its natural grey. Midtones between the two are left alone, and pushed to full it can thin delicate strokes.
Can this tool remove the lines from ruled paper?
▼No, and no tool can do it reliably. Ruled lines sit in the same tonal range as your ink, so any filter aggressive enough to erase them removes parts of the signature too. Crop so the lines fall outside the frame instead, or sign again on plain unlined white paper. This is the single most common avoidable problem with signature uploads.
What is the UPSC three-signature stack and how does it work?
▼UPSC has required three signatures on plain white paper, scanned as one image. Stack mode takes exactly three files, lets you crop each one, and composes them onto a single white canvas with even bands, fitting each inside its band rather than stretching it. The canvas size is a typed field because published figures are not consistent, so confirm against the current notification.
Which ink colour should I use for a signature upload?
▼Black is specified most often, with blue accepted by many portals. The requirement comes from the notification rather than from any general rule, and it varies by exam. The tool preserves whatever colour you signed with rather than converting it, so the choice stays yours. It cannot tell you which colour your form wants.
Does the DPI setting matter for a signature?
▼Usually not. Most signature specs are stated as pixels and kilobytes, and on an upload the DPI tag changes nothing at all. It matters on the two presets stated in millimetres, SSC and PAN, where the 200 DPI tag is what makes the file measure the stated physical size when printed. Those two carry it for that reason.
Is it safe to upload my signature to an online tool?
▼On this page nothing is uploaded. Everything runs through the Canvas API inside your own browser, so the file is never transmitted, queued or stored, and you can disconnect after the page loads and it still works. That matters here more than on an ordinary image, because a specimen signature is a security credential in its own right.
What if my exam is not one of the presets?
▼Use Custom. Type the width, height and KB target your notification states, and the crop locks to whatever ratio those numbers imply while the rest of the pipeline works exactly as it does for a named preset. State PSCs, universities and recruitment boards each set their own figures, and a custom size is the reliable answer for all of them.
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Get Your Signature Upload Accepted
Six presets, trim to signature, ink cleanup and the UPSC three-stack. Honest numbers in both directions. Free, no sign-up, and nothing leaves your device.
Resize My Signature