Compress Triple Signature for UPSC — Free, Fast & Private
The UPSC official signature spec
| Format | JPG / JPEG |
|---|---|
| File size | 20–300 KB |
| Pixels | 350 × 350 to 500 × 500 pixels (width × height) |
| Shape | no ratio stated |
| Print size | not stated |
| DPI | not stated |
| Other rules |
|
The official wording
Applicants are required to sign three times (one below the other) on a plain white paper using a black ink.
Source: UPSC Civil Services Examination 2026 — Notice No. 05/2026-CSE, p. 2, Notes 2–3 (04.02.2026) — checked 5 October 2026
Only need the signature under 300 KB, with no pixel rules? Compress image to 300 KB aims at that size alone; the tool on this page also checks the pixels and the lower limit.
The official documents disagree
The OTR FAQ page allows up to 1000 px; the FAQs PDF caps the signature at 500 px. The tool targets 350–500 px, which passes both.
FAQs.pdf Q43: "The resolution of Signature 350-pixel (Width) * 350-pixel (Height) minimum and 500-pixel (Width) * 500-pixel (Height) maximum."
faq.php Q44: "350 pixel (Width) * 350 pixel (Height) minimum and 1000 pixel (Width) *1000 pixel (Height) maximum."
Source: UPSC One Time Registration — FAQs (PDF), Q42–Q43, p. 6 (undated)
Source: UPSC One Time Registration — FAQ page, Q44 (undated)
The Union Public Service Commission takes the signature through One Time Registration, the portal its examinations share. The table above quotes the instruction from the UPSC Civil Services Examination 2026 — Notice No. 05/2026-CSE, and the size and pixel figures from the registration FAQs.
One file, three signatures
This is the detail people miss. UPSC does not want a single signature scanned neatly on its own. It wants your name signed three times, stacked vertically, on one sheet, and that whole sheet becomes one image. Plain white paper, black ink, nothing else on the sheet.
Stacking three wide signatures produces something close to a square, which suits limits that are the same in both directions. At the largest size the instructions allow, 500 × 500 px, each of your three rows gets roughly 166 pixels of height. That is plenty to stay legible, so there is no need to squeeze the rows together.
The defence examinations ask for exactly the same sheet. The UPSC NDA & NA Examination (II) 2026 — Notice No. 10/2026-NDA-II (p. 2, Notes 2–4) says: Applicants are required to sign three times (one below the other) on a plain white paper using black ink and upload the same while filling up the Common Application Form (CAF).
and gives no size of its own, so an NDA or CDS signature is made to the limits on this page.
Two official pages, two pixel ceilings
UPSC publishes its upload instructions twice, as a PDF of frequently asked questions and as an FAQ web page, and they do not agree on the maximum size. The note under the table prints both sentences. The PDF stops the signature at 500 pixels a side; the web page allows a larger image. A file inside the PDF’s window satisfies both, so that is the window the tool works to. Both documents agree on the file-size band, 20–300 KB, and on the same band for the photograph.
The floor is the hard part
Black ink on white paper compresses extremely well. Shrink a stacked signature to 500 pixels and save it as an ordinary JPEG, and the file can easily land under the minimum. Too small is as much outside the band as too large.
The tool reads the floor at 1,024 bytes to the kilobyte, so it aims for at least 20,480 bytes. It reads the ceiling at 1,000, so it stays at or under 3,00,000. If you prepare the file by hand and it comes out too light, raise the JPEG quality or keep more pixels; do not pad the sheet with white space.
Preparing the sheet
- Use plain white paper and a black pen, and sign three times, one below the other — that is all the notice says. Our own advice, not a UPSC rule: leave a little room so the three signatures do not touch.
- Photograph or scan the sheet square-on, in even light, without shadows from your hand or phone.
- Trim to the three signatures. If you want to set the crop by hand, crop the image first; aim for a roughly square result.
- Drop it into the tool above, read the reported pixel size and byte count, and download.
The photograph has its own instructions, a pixel window that starts higher, and a live camera capture on top of the uploaded file. The UPSC photo page covers that file. If you are sitting other examinations this year, a GATE signature is a single strip 2.75 to 3.75 times wider than tall, the opposite shape to this one. The government exams hub lists every page MiniPx has checked against its notice.
Common rejection reasons
A poor-quality photograph or signature (applies to the photo and signature)
You may please note that if the quality of Photograph or Signature is poor, the application is liable to be rejected.
UPSC One Time Registration — FAQs (PDF), Q45, p. 6
Not a reason for rejection: The pixel size of the image, or the colour of the ink (applies to the photo and signature)
UPSC is concerned with identification of a candidate at the Exam Hall based on the images uploaded by the candidate and not to cancel the candidature based on the size or colour of ink used.
UPSC One Time Registration — FAQs (PDF), Q41, p. 5
The same statements, for every exam MiniPx has checked, are on the exam rejection reasons page.
The work happens inside your browser. Your signatures are never uploaded to MiniPx, and the exact size of the result is shown before you save it.