Signature Resizer — For SSC, IBPS, UPSC, Sarathi, PAN & 25+ More

Every Indian government exam, banking application, and identity portal has its own signature size requirement — and the cost of getting it wrong is the form failing to submit, or worse, the application getting rejected at verification. SSC wants exactly 140×60 px at 10–20 KB. UPSC wants three signatures stacked vertically. Sarathi caps everything at 20 KB. CAT wants 80×35 px. None of the portals offer a tool — you have to figure it out yourself, then meet the spec on the first try because most portals limit upload retries.

Universal signature rules across Indian portals

A few rules apply to almost every portal: handwritten only(no typed signatures, no Word "signature font" — live verification at exam centres will catch a typed signature); black ink is the safe default (works on 100% of portals; blue works only on RRB, Sarathi, JEE, and some state PSCs); plain unruled white A4 paper (notebook lines and watermarks survive compression); full signature, not initials (Sarathi specifically rejects initials); JPEG only(PNG, HEIC, WEBP, PDF all return "Invalid File Format" silently); no capital block letters (auto-rejected because capitals are too uniform across people, defeating uniqueness verification).

Sarathi Parivahan — India's strictest 20 KB cap

The Sarathi/Vahan driving licence portal hard-caps both photo and signature at 20 KB — among the strictest specs in India. The cap dates from the MeitY 2010s storage standard (per-record image weight capped at 20 KB to keep the all-India DL database under 1 TB) and has never been revised despite cloud migration. To get a signature under 20 KB without losing visible quality: sign 4–5 cm wide on white paper, scan or photograph at 200 DPI, convert to grayscale, target JPEG quality around 70%. Maharashtra and Karnataka RTO portals add a 30 KB cap on supporting document scans; UP learner-licence portal occasionally throws errors below 10 KB if the signature is too small to encode meaningfully.

UPSC's triple-signature rule

UPSC is the only major Indian exam that requires three signatures stacked vertically in a single uploaded image. The reason is anti-forgery: three samples let the commission verify natural handwriting variance versus a forged single instance. The file should be named signature.jpg and contain three identical (but naturally varying) signatures one below the other, all in black ink only on plain white background. The image should be 350×350 px or thereabouts, with a file size between 20 and 300 KB.

How to photograph a signature properly with your phone

A phone photo can match scanner quality if done right. Sign on plain white A4 printer paper with a black gel or fine ballpoint pen (0.5–0.7 mm tip) at natural size — 4–5 cm wide is the sweet spot. Place the paper on a flat surface in bright indirect daylight (no flash, no harsh sun, no shadow). Hold your phone directly above the paper, parallel — any tilt causes perspective skew that GATE's aspect-ratio validator catches. Use a scanner app (Adobe Scan, Microsoft Lens, Google Drive scan) — they auto-deskew, auto-crop, and bleach the background to pure white. Export as JPEG with quality 80–90%, then resize with this tool.

Pixels vs centimetres vs KB — understanding the three numbers

Portals quote dimensions in pixels, centimetres, or both — and the conversion depends on DPI (dots per inch). At 96 DPI (web standard), 140×60 px equals about 3.7×1.6 cm. At 200 DPI (NSDL PAN standard), the same 140×60 px is only 1.78×0.76 cm. That's why a signature that “looks right” on screen can fail print verification — the underlying centimetre dimension is too small for the scanner to resolve. KB is a third independent constraint that depends on JPEG compression, unrelated to pixel or centimetre size. This tool handles all three: it resizes to the exact pixel dimension first, then compresses the JPEG to the portal's KB cap.

Live signature vs uploaded signature

The signature you upload at the application stage is a reference template. The signature you sign with wet ink on the exam-day attendance sheet must match it. Significantly different style — for example, you uploaded a careful cursive version but sign with a quick scrawl on exam day — can flag you for disqualification at SSC, IBPS, SBI, RBI, and UPSC. Practice signing the same way you did when you scanned for the application. IBPS interviews and SBI PO interviews also include a live tablet-signature capture in the verification room — your tablet signature should match both your uploaded one and your attendance-sheet one.

What changed in 2025–2026

UPSC live photo upload — UPSC now requires a live webcam photo capture in addition to the uploaded photo, new for the CSE 2026 cycle, to combat fake-candidate impersonation. Signature upload unchanged (still triple-stack JPG). IBPS live photo mandate — IBPS PO/Clerk/RRB forms now block submission until you capture a live photo via webcam or phone camera; affects desktop users without webcams. Signature upload unchanged. DigiLocker eSign expansion — MeitY expanded Aadhaar eSign across many government services in 2025, but no major exam portal has switched to Aadhaar-eSigned signatures yet. Every recruitment form still requires the uploaded handwritten JPG scan.

Free, no signup, no watermarks, no ads inside the tool. Your signature is processed entirely in your browser — it never touches a server.