Sukat · Signature · 20 KB

Compress a signature to an exact 20 KB

UPSC, SSC, IBPS, SBI, RRB — most banking-exam and government-recruitment signature uploads cap the file at 20 KB. Sukat preserves the signature’s edge clarity, drops quality first, and downscales pixels only if quality alone can’t reach 20 KB. All in your browser.

Compress signature to 20 KB now →
Last reviewed: May 2026
A 1.2 MB signature scan reduced to fit under a 20 KB exam-portal limit Animation: you set a 20 KB limit; the signature scan counts down from 1.2 MB through 320 KB, 86 KB, 32 KB and lands at 18 KB, under the limit. YOUR SIGNATURE YOUR LIMIT 20 KB ← banking-exam signature cap CURRENT FILE SIZE 1.2 MB 320 KB 86 KB 32 KB 18 KB binary search · ~7 re-encodes, edges preserved DONE18 KB — under your limit
How to

Compress a signature to 20 KB

Three steps. Most exam portals require JPG output, so Sukat defaults the format dropdown accordingly.

Scan or photograph your signature

Sign on a clean white sheet, then scan or take a well-lit phone photo. Drop the image onto Sukat — JPG, PNG, HEIC, or WebP all work.

Set 20 KB and pick JPG

Type 20 in Maximum File Size and select KB. Pick JPEG — most exam portals require JPG for signatures. Pick PNG only if your portal explicitly asks for it.

Convert and download

Sukat binary-searches for the highest quality that fits under 20 KB. If quality 1 still can’t fit, it downscales pixel dimensions and tries again. The live preview shows the actual output before you click download.

When you need it

Where 20 KB signature uploads matter

Almost every major Indian government recruitment and banking exam enforces a 20 KB signature cap. Where it shows up:

  • UPSC Civil Services & Mains. The UPSC online application enforces a 20 KB JPG signature ceiling for every candidate.
  • SSC CHSL, CGL, MTS, GD. Staff Selection Commission exam portals require a 20 KB JPG signature with a fixed 140×60 aspect window.
  • IBPS PO, Clerk, RRB. Banking-exam signature uploads cap at 10–20 KB depending on the cycle; 20 KB is the safe target for IBPS PO and Clerk.
  • SBI PO, Clerk, Apprentice. State Bank of India online application forms cap the signature at 20 KB JPG.
  • State PSC and railway-board portals. RRB Group D, NTPC, and most state Public Service Commission forms carry forward the same 20 KB ceiling.
  • NEET, JEE, NTA-administered exams. Most NTA test portals require a 10–20 KB JPG signature; 20 KB works for nearly all of them.
Why Sukat

Built for exam-portal signature uploads

Signatures look bad at 20 KB only when the compressor blurs the edges or rounds the curves. Sukat doesn’t.

Hits 20 KB, not “close to” 20 KB

State the cap; the algorithm binary-searches the quality scale, converging in roughly seven re-encodes. The output is under 20 KB at the highest quality that keeps the signature’s edges sharp. One pass, every time.

Edges preserved

Sukat’s WebP / JPEG encoder weights detail toward high-contrast strokes (your signature) and trims whitespace first. The ink stays crisp at 20 KB; the white paper compresses for free.

JPG output by default

Most exam portals require JPG for signatures (some still call it “.jpg only”). Sukat defaults to JPEG. Switch to PNG, WebP, or even ICO from the dropdown if your portal is the exception.

Dimensions held when they can be

A typical 600–800 pixel signature scan usually fits at 20 KB at original dimensions. Sukat drops quality first and only downscales when quality alone can’t reach the cap. The preview shows the actual output before you commit.

Privacy

Your signature never leaves your browser. Compression runs entirely on the Canvas API; no upload, no server, verifiable in airplane mode.

Questions

FAQ

Will my signature stay sharp at 20 KB?

For a typical 600–800 pixel scan, yes — signature ink is high-contrast against white paper, which JPEG and WebP compress very efficiently. A 20 KB output usually preserves the original dimensions with no visible edge blur.

JPG or PNG for an exam-portal signature?

JPG — most Indian exam portals require it (UPSC, SSC, IBPS, SBI, RRB all do). Pick PNG only if your portal specifically asks for PNG (rare). Sukat defaults to JPEG for this reason.

What aspect ratio should the signature image be?

Most portals expect a wider-than-tall signature image (around 3:1 to 4:1). UPSC accepts up to 140×60 pixels; SSC and IBPS are similar. Crop using Sukat’s built-in Crop tool before compressing if your scan has too much whitespace.

Does Sukat preserve signature dimensions at 20 KB?

Yes for the typical 600–800 px signature. Sukat drops quality first; dimensions only shrink if quality 1 still can’t hit 20 KB. The preview shows the actual output dimensions before you click download.

Is my signature uploaded to a server?

No. Compression runs entirely in your browser via the Canvas API. Your signature never leaves your device. Verify by switching to airplane mode after the page loads.

Can I batch-compress multiple signatures?

Yes. Drop several signature images, set 20 KB as the target, and Sukat compresses each independently. Output downloads as separate files or as a single ZIP.
Related tools

Other sizes & related tools

Compress Signature to 10KB — tighter cap for some IBPS / SBI / NTA exam cycles Compress Image to 20KB — same cap for non-signature images Compress Image to 30KB — neighbour for candidate-photo uploads Compress Image to 50KB — common older-portal target Reduce Image Size in KB — pick any custom KB target Image Size Guide — full breakdown by platform and use case

State the cap. Sukat hits 20 KB.

Free, browser-based, no upload, no watermark. Edges preserved, JPG by default, ready for UPSC / SSC / IBPS / SBI / RRB.

Compress signature to 20 KB now →