Two things share one name in daily talk - the signature picture you paste on a PDF, and the DSC digital signature a Certifying Authority issues. They look similar on paper. Legally and technically, they are not the same thing at all, and this page separates them once and for all.
Someone says "just put a digital signature on it" and means three different things in the same week: draw a sign in an app, type a name in a fancy font, or sign with a USB token. The confusion is understandable - and expensive, because tender and filing rejections often say nothing more helpful than "signature not valid". Here is the difference in plain words: what each one is, what each one proves, and how a reader can tell them apart. Once you know this, you will always pick the right one the first time.
A signature image is exactly what the name says - a picture. Whether you drew it with your finger, typed it in a script font or scanned it from paper, the PDF receives a small image (or a text stamp) placed on the signature line. The PDF does not know whose picture it is. It cannot check anything about it.
In law this is used as an electronic signature - evidence that you applied your mark intending to sign. Its weight comes from context: the email trail, the relationship, the fact you sent it. On its own, the picture proves very little, because the identical picture can be lifted out of the file and placed on a completely different document in under a minute.
A Digital Signature Certificate is a digital ID card for signing. A licensed Certifying Authority checks your identity documents first, then issues the certificate - commonly on a password-protected USB token. When you sign, the software computes a hash (a fingerprint) of the document, encrypts it with your private key, and embeds that seal inside the PDF.
Anyone opening the file can then verify two things mathematically: the document has not changed since signing (the fingerprint still matches), and the signature belongs to the certificate holder (your verified identity). That is why governments and tender authorities trust it - it does not depend on believing anyone.
India's Information Technology Act recognises electronic signatures broadly and gives special strength to digital signatures built on the asymmetric crypto system and certificate authorities - DSC signatures sit in the strongest, most clearly defined category, backed by licensed CAs regulated under the Act.
The practical translation: for private, everyday documents, parties can accept an electronic signature by agreement, and courts look at the full evidence. For the long list of government processes - company filings, tax, tenders, provident fund and similar - the rules name the DSC route specifically, and the portal often technically enforces it: an image-signed file simply fails validation at upload.
This thirty-second check tells you instantly what any "digitally signed" file actually contains.
Use the signature image for everyday and internal paperwork: forms a person will read, acknowledgements, applications to private organisations, office approvals. It is free, instant and understood by everyone. Use a DSC whenever the receiving side is a government portal, a tender, a statutory filing, or any instruction sheet that uses the words Digital Signature Certificate - and for high-value contracts where tamper-proofing protects you too.
Choosing wrong in one direction wastes a submission; choosing wrong in the other wastes money. Now you know how to choose right.
Watch the video to see the free signature-image route done properly - and use this page to decide when that route is the right one.
▶️ Watch Full VideoNo. Private parties can agree to accept electronic signatures for their own documents, and many do for speed. The limit is statutory and portal-based work, where the rules themselves specify DSC signing - there, private agreement cannot override the requirement.
No. They are created by completely different processes. A DSC signature is generated at signing time with your certificate and private key; there is no way to upgrade a picture into one afterwards. The document must be signed again, properly, with the DSC.
It is always stronger proof, but it costs money, needs a token and renewal, and is overkill for a leave form. Match the tool to the document: image for everyday reading-by-humans paperwork, DSC where verification, law or value demands it.