# How to eSign a PDF: 4 Ways to Sign, Plus Electronic vs Digital Signatures

> Learn how to eSign a PDF by drawing, typing, or uploading a signature, and understand the legal differences between electronic and digital signatures.

**Canonical:** https://trydocsy.com/blog/how-to-esign-a-pdf
**Last updated:** 2026-10-31
**Published:** 2026-10-30
**Privacy:** Runs in your browser; the file is never uploaded.

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Signing a PDF used to mean printing ten pages, scribbling on the last sheet with a ballpoint pen, scanning it back to your computer, and tossing the paper. Electronic signing replaces that paper loop with a few clicks. But not all signatures work the same way under the hood. Placing a signature picture on a page is not the same as locking a document with a cryptographic certificate, and different agreements call for different methods.

## Short answer

To eSign a PDF quickly, open [Sign PDF](https://trydocsy.com/pdf/sign), select your file, and draw your signature or upload an image of it. Place it on the signature line, adjust the size, and download. To type your name as a signature, use [Edit PDF](https://trydocsy.com/pdf/edit). If a document must show tampering or prove who signed, you need a cryptographic digital signature backed by a certificate, not a picture of a signature.

## Four common ways to sign a PDF

When you sign a PDF electronically, you attach your mark to the document to indicate approval. Modern software offers four distinct ways to produce that mark.

1. Draw with a trackpad, mouse, or touchscreen: You use your finger or a stylus to write your cursive signature directly onto the screen. This feels closest to physical pen and paper and works especially well on tablets and mobile phones.
2. Type your name: You type your legal name using your keyboard, and the software applies a stylized script font. It creates a clean, readable result if you lack a stylus or find drawing with a mouse clumsy.
3. Upload a scanned signature image: You sign a blank piece of white paper with a dark pen, take a clear photo or scan, crop it, and upload the image. Software strips the background so only your ink lines appear over the document.
4. Apply a cryptographic digital certificate: Rather than drawing a picture, you apply a cryptographic signature using a digital certificate stored on your computer, smart card, or USB token.

For routine forms like rental leases, permission slips, invoices, and supplier onboarding sheets, the first three methods are standard. The tool prepares the mark and places it onto the page in seconds.

## Electronic signatures versus digital signatures

People frequently use the phrases electronic signature and digital signature as if they mean the exact same thing. In legal and security standards, they refer to two completely different concepts.

*How electronic signatures and cryptographic digital signatures differ*

| Feature | Electronic Signature (eSignature) | Cryptographic Digital Signature |
|---|---|---|
| Definition | Any electronic sound, symbol, or process indicating intent to sign | A mathematical scheme using asymmetric public-key cryptography |
| Visual appearance | Drawn ink, typed script name, or uploaded image | Often displays a certificate seal, signer identity, and timestamp |
| Tamper detection | None built into the mark; relies on external audit logs | Mathematical hash breaks if a single character changes in the file |
| Identity proof | Email address, IP log, or self-declaration | Tied to a certificate from a Certificate Authority (CA) via PKI |
| Typical use | Rental agreements, proposals, NDAs, purchase orders | Documents that must show tampering or a checked identity |
| Tool required | Browser signature tool like Sign PDF or Preview | Adobe Acrobat Pro, smart card reader, or dedicated PKI software |

An electronic signature is a legal category. It encompasses any method you use to agree to a document electronically, whether you type your name into a web form, click an I Agree button, or draw your initials. A digital signature is a specific technical implementation that binds your identity to the file using mathematical encryption.

## How cryptographic digital signatures protect documents

When you sign a PDF with a true digital signature, the signing software calculates a cryptographic hash of the entire document. It then encrypts that hash using your private cryptographic key. The encrypted hash and your public digital certificate are embedded directly into the PDF structure.

When another person opens the signed document in a PDF reader such as Adobe Acrobat Reader, the viewer recalculates the document hash and decrypts the signature using your public key. If the two hashes match, the software displays a green checkmark confirming that the signature is valid and the file has not been altered.

If someone modifies a single dollar amount, adds a sentence, or deletes a page after signing, the recalculation fails. The viewer displays an immediate warning that the document was modified after it was signed. Our companion guide explains [what happens when editing a signed PDF](https://trydocsy.com/blog/edit-signed-pdf) and why tampering breaks certificate validation.

## What laws say about signature validity by country

Electronic signatures carry legal standing across most modern legal systems, but statutes define clear boundaries and specific categories.

- United States: The Electronic Signatures in Global and National Commerce Act (ESIGN Act, 15 U.S.C. 7001) and the Uniform Electronic Transactions Act (UETA) establish that a signature or contract cannot be denied legal effect solely because it is in electronic form. Parties must agree to conduct business electronically, and the system must maintain an accurate record. Section 7003 of the Act lists exceptions, including wills and testamentary trusts, adoption, divorce and other family law matters, and court orders and notices.
- European Union: The eIDAS Regulation (Regulation EU 910/2014) defines three levels: electronic signatures, advanced electronic signatures, and qualified electronic signatures. Article 25 says a signature cannot be refused as evidence solely because it is electronic or falls short of the qualified level. A qualified electronic signature, made with a qualified certificate and a qualified signature creation device, has the same legal effect as a handwritten signature.
- United Kingdom: Section 7 of the Electronic Communications Act 2000 allows an electronic signature to be admitted as evidence.
- India: The Information Technology Act 2000 recognizes electronic records and electronic signatures. Its First Schedule lists documents the Act does not cover, including wills and trusts. That schedule was amended in 2022, so check the current list before you rely on it.

Always check the specific statutory requirements of your jurisdiction and governing regulatory agency before signing high-stakes documents electronically.

## How to sign a PDF in your browser with TryDocsy

When you have a routine document that needs your signature, you can sign it immediately without paying for subscriptions or uploading private files to cloud servers.

1. Open [Sign PDF](https://trydocsy.com/pdf/sign) in your web browser.
2. Drag and drop your PDF file onto the upload area. The file opens locally in your browser memory.
3. Choose Draw Signature to sign with your mouse, finger or stylus, or Upload Image to use a picture of your signature.
4. Place the signature where it belongs on the page and resize it to fit the printed line.
5. If your document requires today's date or typed answers, switch to [Edit PDF](https://trydocsy.com/pdf/edit) or follow our instructions on [how to type on a PDF without form fields](https://trydocsy.com/blog/how-to-type-on-a-pdf).
6. Apply the signature and download. Your signed PDF saves directly to your device.

> **Using a photo of your signature**
>
> Sign clean white paper with a dark pen and photograph it in even light. Sign PDF removes the background from an uploaded signature image, and a clear photo gives it the best result.

## When to use a paid enterprise signature service

Browser-based signature tools are intended for single-party signing where you receive a document, attach your signature, and send it back. They do not handle multi-party signing workflows.

If your business requires sending contracts to multiple external parties in a specific sequence, tracking who viewed the link, keeping audit trails, or storing certificates of completion, a dedicated platform such as Adobe Acrobat Sign or DocuSign is the appropriate tool. If you need to make changes to a document after it has already been signed, read our guide on how to [edit a signed PDF](https://trydocsy.com/blog/edit-signed-pdf). To fix the text before signing, follow [our PDF editing comparison](https://trydocsy.com/blog/how-to-edit-a-pdf).

## Frequently asked questions

**Q: Is a typed name on a PDF legally binding?**
A: It can be. In the United States, the ESIGN Act says a signature cannot be denied effect solely because it is electronic, and a typed name can count when you mean it as your signature. Some documents, such as wills, sit outside that rule. This is general information, not legal advice.

**Q: Can I sign a PDF without printing and scanning?**
A: Yes. You can open Sign PDF in any modern web browser, draw your signature with your mouse or finger, place it on the signature line, and download the finished file immediately. The entire process runs in your browser without paper.

**Q: What is the difference between an electronic signature and a digital signature?**
A: An electronic signature is any visual mark, drawn cursive line, or typed name indicating consent. A digital signature is a cryptographic process using public key infrastructure (PKI) and digital certificates that mathematically seals the document and detects any subsequent alteration.

**Q: Does TryDocsy upload my signed PDF to external servers?**
A: No. TryDocsy processes files client-side using JavaScript and WebAssembly inside your browser tab. Your document and signature image never leave your computer or device.

**Q: Why does my digital signature show a warning in Adobe Acrobat?**
A: Adobe Acrobat displays a warning if the document was altered after signing, if the digital certificate expired, or if the certificate issuer is not part of the Adobe Approved Trust List (AATL).

## Tools used in this guide

- [Sign PDF](https://trydocsy.com/pdf/sign) — Draw or upload a signature and place it on your PDF
- [Edit PDF](https://trydocsy.com/pdf/edit) — Edit the existing text in a PDF — free, no sign-up, no watermark

## Sources

- [FDIC Consumer Compliance Examination Manual: the E-Sign Act](https://www.fdic.gov/consumer-compliance-examination-manual/x-3-electronic-signatures-global-and-national-commerce-act-e) (read October 31, 2026)
- [Cornell Legal Information Institute: 15 U.S. Code 7003, specific exceptions](https://www.law.cornell.edu/uscode/text/15/7003) (read October 31, 2026)
- [EUR-Lex: Regulation (EU) No 910/2014 on electronic identification and trust services (eIDAS)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2014.257.01.0073.01.ENG) (read October 30, 2026)
- [UK Legislation: Electronic Communications Act 2000](https://www.legislation.gov.uk/ukpga/2000/7/contents) (read October 30, 2026)
- [Bar & Bench: analysis of the 2022 amendments to the First Schedule of India's IT Act](https://www.barandbench.com/law-firms/view-point/will-documentation-finally-go-paperless-an-analysis-into-the-recent-amendments-to-the-information-technology-act-2000) (read October 31, 2026)

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