How do I compress a signature under 20 KB or 50 KB?

Pick the preset for your exam, drop in your signature scan, and the tool searches for the highest JPEG quality that fits the target while capping the dimensions. The output appears with a size badge so you can check it against your portal limit before downloading.

Is my signature scan uploaded to a server?

No. Resizing and compression both run on an HTML5 canvas inside your browser, so the file never leaves your device. A clean digital copy of your signature is genuinely valuable to anyone willing to misuse it, which is why it should not go to a free conversion server.

Which exam presets are available?

Six: SSC and IBPS at 18 KB with a 140 by 60 pixel cap, NEET at 90 KB, JEE Main at 90 KB, UPSC at 250 KB with a 1000 pixel cap, CAT and IIM at 70 KB, and a custom option where you set the kilobyte target yourself.

Why are the presets not set to the exact published limit?

Because portals specify a range and reject files at either end. Each preset sits comfortably inside its published window rather than scraping the ceiling, so a few kilobytes of variation between one scan and another does not push you over.

Is hitting the target size guaranteed?

Nearly always, but not guaranteed. The tool binary-searches JPEG quality, then reduces dimensions by 15% and retries if even minimum quality is too large, for up to six rounds. If it genuinely cannot reach the target it says so instead of reporting a false success.

Will compression make my signature illegible?

Signatures compress well because they are mostly flat white with thin dark strokes, which is the easiest case for JPEG. The usual cause of a muddy result is a photograph with a grey or shadowed background, so crop tight to the ink and shoot in even light.

What output format does it produce?

JPEG, which is what government, banking, and university portals almost always require. JPEG is also the only sensible choice for hitting a precise kilobyte target, because its quality setting is what makes a specific size reachable at all.

Do I need to resize before compressing?

No. Each preset caps the dimensions and targets the file size in a single pass, so this tool handles both. Use the separate signature resizer when a portal specifies exact pixel dimensions and says nothing about file size.

Signature Compressor

Compress your signature to an exact file size — SSC, IBPS, NEET, JEE Main, UPSC, CAT/IIM presets or custom. No sign-up needed — works entirely in your...

Files never leave your deviceInstant — no upload waitFree, no sign-up

Select Exam / Portal File Size Limit Preset:

Choose your signature scan to compress or drag & drop100% private — compresses signature to under 18 KB inside browser

or import from

A signature compressor reduces a scanned signature to the file size an application portal accepts. Choose your exam preset, drop in the scan, and the tool caps the dimensions and finds the best quality that fits the kilobyte target in one pass. Everything runs in your browser.

Why portals reject signature uploads

Recruitment and admission portals validate uploads with automated scripts, and a signature over the size ceiling is refused before the form will submit. The error message rarely explains which rule you broke, which is why this turns into a twenty-minute problem on deadline day. What makes it worse is that the fix is not obvious: dragging a quality slider in an image editor is guesswork, because the file size depends on the content of the scan as much as on the setting. Searching for the right quality automatically is the whole point of this tool.

Preset targets by exam

Preset targets sit inside each published range. Specifications change between sessions — always confirm against the current official notification.
Exam	Published signature range	Preset target	Pixel cap
SSC (CGL, CHSL, GD)	10–20 KB, 140×60 px	18 KB	140 × 60
IBPS bank exams	10–20 KB, 140×60 px	18 KB	140 × 60
NEET UG (NTA)	10–100 KB	90 KB	600 × 300
JEE Main (NTA)	10–100 KB	90 KB	600 × 300
UPSC Civil Services	20–300 KB, up to 1000×1000 px	250 KB	1000 × 1000
CAT / IIM	Up to 80 KB, 80×35 mm	70 KB	400 × 175

Mind the minimum as well as the maximum

Most people search for how to get a signature under a limit, but nearly every one of those specifications is a range. SSC and IBPS publish 10 to 20 KB, NTA exams 10 to 100 KB, UPSC 20 to 300 KB. A file below the floor is rejected exactly as firmly as one above the ceiling, so compressing a signature to 6 KB for an SSC form fails validation just as reliably as leaving it at 200 KB. That is why every preset here aims inside its window rather than at the smallest achievable file. Two boards have also revised these numbers between sessions recently, so check the current notification for your exam rather than a figure copied from a coaching blog.

How the target size is reached

Two stages, and the second is the one that matters for a phone photo. First the toolbinary-searches the JPEG quality at the preset dimensions, narrowing the range each time to converge on the best quality that still fits. If even the lowest quality is still too large, itreduces the dimensions by 15% and searches again, up to six rounds. Being straight about the edge case: if it still cannot reach the target it gives you the smallest result it managed and tells you, rather than claiming a success it did not achieve.

Scanning a signature that compresses cleanly

Sign in black or dark blue on plain unlined white paper. Most portals require it and the contrast compresses better.
Crop tight to the ink so the available bytes describe your handwriting rather than empty paper.
Use even light. Shadows and a grey background add detail the encoder has to spend bytes on.
Avoid lined or textured paper, which adds noise across the whole image.
Check the size badge against both ends of your portal's published range before uploading.

Why this runs on your device

A handwritten signature is the mark used to authorise bank instructions, loan agreements, and identity documents. Uploading one to a free compression site leaves a stranger's server holding a clean copy indefinitely, and during application season those sites receive millions of them. Everything here happens on a canvas in your own browser, so there is no upload, no remote copy, and nothing to request deletion of afterwards. Keep your original scan somewhere private too, rather than in a shared photo library.

The rest of the application

If your portal specifies exact pixel dimensions instead of a file size, thesignature resizer handles those presets. For the passport-style photograph that sits alongside the signature, use resize image to 20KB or thepassport photo maker. The exam tools hubcollects everything else these forms ask for, including theage limit calculator for checking eligibility.

Frequently Asked Questions

How do I compress a signature under 20 KB or 50 KB?
Pick the preset for your exam, drop in your signature scan, and the tool searches for the highest JPEG quality that fits the target while capping the dimensions. The output appears with a size badge so you can check it against your portal limit before downloading.
Is my signature scan uploaded to a server?
No. Resizing and compression both run on an HTML5 canvas inside your browser, so the file never leaves your device. A clean digital copy of your signature is genuinely valuable to anyone willing to misuse it, which is why it should not go to a free conversion server.
Which exam presets are available?
Six: SSC and IBPS at 18 KB with a 140 by 60 pixel cap, NEET at 90 KB, JEE Main at 90 KB, UPSC at 250 KB with a 1000 pixel cap, CAT and IIM at 70 KB, and a custom option where you set the kilobyte target yourself.
Why are the presets not set to the exact published limit?
Because portals specify a range and reject files at either end. Each preset sits comfortably inside its published window rather than scraping the ceiling, so a few kilobytes of variation between one scan and another does not push you over.
Is hitting the target size guaranteed?
Nearly always, but not guaranteed. The tool binary-searches JPEG quality, then reduces dimensions by 15% and retries if even minimum quality is too large, for up to six rounds. If it genuinely cannot reach the target it says so instead of reporting a false success.
Will compression make my signature illegible?
Signatures compress well because they are mostly flat white with thin dark strokes, which is the easiest case for JPEG. The usual cause of a muddy result is a photograph with a grey or shadowed background, so crop tight to the ink and shoot in even light.
What output format does it produce?
JPEG, which is what government, banking, and university portals almost always require. JPEG is also the only sensible choice for hitting a precise kilobyte target, because its quality setting is what makes a specific size reachable at all.
Do I need to resize before compressing?
No. Each preset caps the dimensions and targets the file size in a single pass, so this tool handles both. Use the separate signature resizer when a portal specifies exact pixel dimensions and says nothing about file size.