search⌘KtranslateENexpand_moreupload_fileConvert

Sign PDF Online Free

Sign it here. No printer, no scanner, no account.

Draw your signature with a mouse or finger, or type your name in a handwriting style. Then click the page where it belongs. The PDF is signed in your browser and kept on your device.

drawDrawkeyboardTypeshort_textInitials

×Sign here with your mouse or finger

undoUndodeleteClear

Initial every page (bottom corner)

ink

pen

lockYour signature stays on this device. Nothing is sent to a server.

tenancy-agreement.pdf · p. 3/3draw a signature first

12. SignaturesBy signing below, both parties agree to the terms set out in sections 1 to 11 of this agreement, including the deposit, rent schedule and notice period.

Tenant signature

Landlord signature

Date

13 October 2026

size

eventAdd today’s date

upload_fileOpen a PDFdrawCreate a signature to continuedownload ·

~/electronic-vs-digital

A picture of your signature isn't the same as a digital signature.

This tool adds an electronic signature: your mark, placed on the page. A digital signature adds a certificate that proves who signed and locks the file. Edit the signed document below to see what each one can detect.

after signing, someone changes…editNothingcurrency_poundThe rent figureevent_busyThe notice period

Monthly rent: £1,150
Notice period: 2 months

drawElectronic signaturewhat this tool makes

check_circleSigned document, unchanged

Shows intent to sign, and is accepted for most everyday agreements. It can’t prove the text wasn’t edited afterwards, so keep your own copy.

verified_userDigital signaturecertificate-based

verifiedSignature valid, document unchanged

Uses a certificate from a trusted provider. Any change breaks it, and the signer’s identity is verified. Needed for some legal and government filings.

~/what-a-digital-signature-actually-signs

Change one character, and the maths says no.

A digital signature doesn’t sign a picture of your name; it signs a fingerprint of every byte. Below, your browser made a real ECDSA P-256 key pair when the page loaded and signed the clause text. Pick an edit in the section above and the page verifies the edited text against that signature.

Signed bytes vs. bytes now75 bytes signed

4. Rent. GBP 1,150 per calendar month.11. Notice. 2 months written notice.

SHA-256 signedcb3f56b92af567ae712c3329a842ac4e70c777007240e8fb849ebd499489bbdc

SHA-256 nowcb3f56b92af567ae712c3329a842ac4e70c777007240e8fb849ebd499489bbdc

ECDSA signature45fb0e45399e72f815b8e7819a40ca530458f79ffbd3338b8812b7844f4d3ad7… (r ‖ s, 64 bytes)

public key xtmjJj_rDJ3Cok94ew4-W_jI5ub5UreGslmanXkSHLqU

first change atnone: bytes identical

verifiedValid. The text matches what was signed, so crypto.subtle.verify() returns true. Only the holder of the private key could have produced this signature.

How a PDF holds the signature

/Type /Sig/Filter /Adobe.PPKLite/SubFilter /ETSI.CAdES.detached/ByteRange [0 18420 26614 3118]/Contents <45fb0e45399e72f815b8e781…000000> % 8194-byte hole/M (D:20261012234125Z)

/ByteRange lists the two stretches of the file that are hashed: everything except the hole that will hold the signature itself. A real PDF wraps the signature in a CMS container with the signer’s certificate chain (PAdES); this demo stops at the raw ECDSA step, so the download above is visibly signed but not certificate-signed.

~/before-you-send

Five things that get a signed PDF sent back.

Tick off each one as you check it. These are the reasons landlords, HR teams and banks most often return a document.

0 of 5 checked

check_box_outline_blankEvery signature field is filledContracts often have a signature, a printed name and initials on earlier pages.check_box_outline_blankThe date is on itMany forms are invalid undated. Use the date button above.check_box_outline_blankIt’s the final versionSigning a draft means signing again later. Check the version number or footer.check_box_outline_blankYour name matches your IDBanks compare the printed name with official documents.check_box_outline_blankNothing was asked for in inkSome organisations still require a wet signature; if so, print instead.

~/is-it-valid

For most everyday paperwork, yes. For some documents, no.

Laws in the US, UK and EU generally accept electronic signatures for ordinary agreements. A few document types still need wet ink, a witness or a certified digital signature. This is general information, not legal advice: check with whoever asked you to sign.

homeTenancy agreementsusually fineMost landlords and agents accept e-signed leases.

workJob offers & NDAsusually fineStandard practice in HR.

receipt_longInvoices & quotesusually fineAn e-signature on acceptance is common.

account_balanceBank & mortgage formsdependsMany accept it; some require their own signing platform.

gavelWills & deedsoften notOften need wet ink and witnesses in person.

publicCourt & government filingsoften certifiedMay require a qualified digital signature.

~/reference

Signature levels, and the standards behind them.

Legal weight differs by country; this is a summary from general knowledge of eIDAS, ESIGN/UETA and UK law, not legal advice.

LevelWhat it isDetects edits?Example

Simple electronicthis toolAny sign of intent: a typed name, a drawn image, a click.NoThis tool, email sign-off

Advanced (AdES)this toolUniquely linked to the signer and to the data; any change is detectable.YesPlatform-signed PDFs

Qualified (QES)this toolAdvanced, plus a qualified certificate and secure device; equal to handwriting in the EU.YesSome EU filings

PAdES-LTVthis toolPDF signature with embedded revocation data so it can be validated years later.YesArchived contracts

Wet ink + witnessthis toolHandwritten on paper, often with a witness present.Only physicallyWills, some deeds

Timeline

1976Diffie and Hellman describe public-key cryptography and digital signatures.

1977RSA makes digital signatures practical.

1992ECDSA is proposed; it later enters FIPS 186.

1999The EU Electronic Signatures Directive is adopted.

2000The US ESIGN Act gives e-signatures legal effect.

2001PDF 1.3 and Acrobat 5 support signature fields with /ByteRange.

2009ETSI publishes PAdES (TS 102 778) for long-term PDF signatures.

2016eIDAS replaces the directive, defining simple, advanced and qualified signatures.

2019The Law Commission confirms e-signatures can validly execute most documents in England and Wales.

2021Researchers publish shadow attacks that change signed PDFs’ visible content.

~/other-pdf-tools

Before and after signing.

PDF tools people use alongside this one.

call_mergeMerge PDFCombine the signed contract with its schedules into one file.contract.pdf + annex.pdfarrow_forwardcontract-full.pdf content_cutSplit PDFSend only the signature page back, if that’s all they need.tenancy.pdf · 3 pparrow_forwardpage-3.pdf compressPDF compressorMake the signed file small enough to email.signed.pdf · 9 MBarrow_forward1.4 MB

Sources

[1]Electronic signatures (eIDAS)EU rules on electronic and qualified signatures.European Commission ↗[2]ESIGN ActUS federal law on electronic signatures.US FDIC ↗[3]Electronic execution of documentsThe Law Commission’s view for England and Wales.Law Commission ↗[4]ETSI EN 319 142: PAdESPDF advanced electronic signature profiles.ETSI ↗[5]FIPS 186-5: Digital Signature StandardECDSA and the P-256 curve used in the lab.NIST ↗[6]W3C: Web Cryptography APIcrypto.subtle.sign and verify.W3C ↗