Is this PDF signer really free?

Yes. 100% free forever — no trial, no premium tier, no per-signature charge, no daily quota. Sign as many PDFs as you want. Ad-supported so it stays free for everyone. Unlike Adobe Acrobat (which gates cryptographic signatures behind a $15/mo subscription), Smallpdf (2 signatures / day free), and iLovePDF (free tier limited) — we give you everything on the free tier.

Do I need an account?

No. No signup, no login, no email, no captcha, no credit card. Open the page, drop your PDF, sign, download.

Is my PDF uploaded to a server?

No. The entire signing happens locally in your browser using the Web Crypto API for RSA keypair generation and PKCS#7 / CMS packaging. Your PDF never leaves your device — there is no server-side copy because we don't have a server for your files.

Is my signature or private key sent anywhere?

No. Your signature image, drawing, or typed name stays in browser memory. If you upload a .p12 / .pfx certificate, it's parsed locally — never transmitted. The generated private key for self-signed certs lives in Web Crypto's non-extractable storage and is discarded when you close the tab.

What's the difference between an electronic signature and a digital signature?

An electronic signature is any visible mark placed on a document — a drawn scribble, a typed name, a photo of a handwritten signature. It looks like a signature but has no cryptographic proof. A digital signature is a cryptographic operation: the document's content is hashed (SHA-256), the hash is encrypted with your private key (RSA-2048), and the result is embedded in a PKCS#7 / CMS structure inside the PDF. Anyone can verify two things from that: (a) the document hasn't been modified since signing, and (b) it was signed by the holder of the corresponding private key. Most legal jurisdictions (EU eIDAS, US ESIGN, most of Asia) recognise digital signatures as legally equivalent to wet-ink signatures; electronic-only signatures sit on weaker footing. Our tool does both — visible AND cryptographic — in a single signing pass, which is what Adobe Acrobat Pro also does, but for free.

How do I sign a PDF for free?

Drop your PDF on the page above. The editor opens with the Certify modal pre-selected. Choose draw / type / upload for a visible signature, then click the page where it should go. Click Save — the PDF is cryptographically signed with your in-browser-generated certificate and downloads. Entirely free, entirely local, no signup. Most competitors gate either the crypto or the no-watermark output; we don't.

How do I add a signature to a PDF?

Same flow. Drop PDF, pick how to produce the signature (draw / type / upload a PNG or JPG of your signature), place it by clicking the page. Our visible signature renders at the exact pixel position you click, with the size you drag to, so it lines up with the signature line on contracts, NDAs, tax forms, etc.

Are PDF signatures legally binding?

In most jurisdictions, yes, with nuance. The EU's eIDAS regulation recognises three tiers: Simple Electronic Signature (SES — e.g. a typed name, accepted but weaker), Advanced Electronic Signature (AES — uniquely identifies the signer, our cryptographic output qualifies), and Qualified Electronic Signature (QES — requires a trust-service-provider-issued certificate, not produced by our tool). The US ESIGN Act (2000) and UETA treat most electronic signatures as legally equivalent to wet-ink. High-stakes contexts (notarised deeds, some courts) may require QES or physical signatures — consult a lawyer if the stakes warrant it. For everyday business use (contracts, NDAs, HR forms, vendor agreements), our cryptographic output is usually sufficient.

What is PKCS#7 / CMS?

PKCS#7 (Public Key Cryptography Standards #7), also known as CMS (Cryptographic Message Syntax), is the standard encoding for digitally signed data that every major PDF viewer understands. When you sign a PDF through our tool, we compute a SHA-256 hash of the document's byte range, encrypt the hash with your RSA-2048 private key, and package the result along with your certificate into a PKCS#7 structure. That blob is embedded inside the PDF's /Sig field. Adobe, Chrome, Edge, Foxit, and macOS Preview all read PKCS#7 signatures natively and show a verification badge — the exact same mechanism Adobe Acrobat Pro and DocuSign use.

Do the signed PDFs work in Adobe Acrobat?

Yes. Our PKCS#7 output is standards-compliant — we tested against Adobe Acrobat Reader DC, Adobe Acrobat Pro, Chrome's built-in PDF viewer, Edge, Firefox's PDF.js, macOS Preview, and Foxit Reader. All show a verification badge. For self-signed certificates (generated in-browser), Adobe shows yellow 'signer unknown' warning — this is the correct behaviour, because self-signed certs have no third-party trust anchor. To get a green badge, upload a .p12 from a trusted Certificate Authority (Digicert, Sectigo, GlobalSign, your organisation's internal PKI).

How do I sign a PDF with a .p12 / .pfx certificate?

In the Certify modal, click 'Use existing certificate'. Upload your .p12 or .pfx file, enter the password if it has one. The certificate is parsed locally — both the public and private key stay in browser memory and are used only for this signing pass. The signed PDF carries your real identity (issuer, subject, validity dates) which any verifier can check against the issuing CA's root store.

What if I just want a visible signature without the crypto?

Pick the 'Visible only' option in the Certify modal. You get a PDF with your drawn / typed / uploaded signature placed on the page — no cryptographic structure, no PKCS#7 embedding. This is equivalent to what iLovePDF and Smallpdf produce on their free tiers. It's legally weaker (just an electronic signature, not an advanced one) but fine for casual use where the other party doesn't need cryptographic proof.

Can multiple people sign the same PDF?

Yes, sequentially. Sign once and download. The recipient opens the signed PDF in our tool, drops it in, and signs again. PDF's byte-range mechanism supports any number of sequential signatures; each new signature covers a byte range that includes the previous signatures, producing a chain of verifiable signatures. (Concurrent multi-party signing — one PDF sent to five people at once — requires workflow software like DocuSign or Adobe Sign; we're a single-user tool, not a workflow orchestrator.)

Does it work offline?

Yes, once the page has loaded. The signing engine runs entirely in your browser — you can disconnect from the internet and keep signing. Great for sensitive documents (NDAs, medical releases, financial agreements) you'd rather process without any network connection active.

Can I sign a PDF on my phone?

Yes. Open the page on your phone's browser, tap Select PDF, tap Draw and trace your signature with your finger on the touchscreen, tap Save. Works on iPhone Safari, iPad, Android Chrome. Touch signing feels natural on iPad Pro with Apple Pencil — comparable to DocuSign's mobile experience but without the subscription.

Can I sign a password-protected PDF?

If the PDF is owner-locked (opens without a password), yes. If it requires a password to open, unlock it first with our /unlock-pdf tool, then sign. Our unlocker is also 100% local — the password never leaves your device.

What about timestamped signatures (RFC 3161 TSA)?

Timestamped signatures add a trusted-time-server stamp to prove WHEN a document was signed, independent of the signer's system clock. They require a network call to an external TSA (Time Stamping Authority) — which breaks our local-only promise. We don't ship timestamping today. If you need it for legal archival / long-term validation (LTV), our tool isn't the right fit; use Adobe Acrobat Pro or a commercial e-signing service. For 99% of personal and small-business signing, non-timestamped signatures plus the date field we embed are sufficient.

Is this the best free PDF signer?

For privacy-first workflows where you don't want your PDF, signature, or private key to touch a server, and where you want cryptographic signatures on the free tier (not gated behind Adobe's $15/mo), we think so — and we explicitly compare ourselves to Adobe, Smallpdf, iLovePDF, DocuSign, and Sejda below. For cross-party signing workflows (send to 5 people, track who signed), you need DocuSign or Adobe Sign. Pick the tradeoffs that match your actual use case.

Sayina i-PDF — Mahhala, Kuyimfihlo, I-Cryptographic

Amasiginesha abonakalayo KANYE namasiginesha edijithali ye-cryptographic (PKCS#7) — kokubili kumahhala, kokubili okwasendaweni, kokubili kuqashelwa ngokomthetho

Drop a PDF and we open it in the editor with the Certify modal pre-selected. Draw your signature with mouse / trackpad / finger, type your name, or upload a signature image. Add reason / location / date fields. Place the visible signature anywhere on the page. We cryptographically sign the output using an in-browser-generated RSA-2048 self-signed certificate (or your own .p12 if you have one). Your PDF, your signature, and your private key never leave your device. No signup, no watermark, no per-signature charge. The only free PDF signer that does real cryptography.

100% Mahhala Phakade Akudingeki I-akhawunti 100% Kudivayisi Yakho Ukubethela Kwebanga Lezempi

Amafayela awalokothi ashiye idivayisi yakho

Ukubethela kwe-AES-256

Asikwazi ukubona amadokhumenti akho

Alukho uxhumano oludingekayo

Beka i-PDF yakho lapha

noma

PDF · Akukho okulayishiwe — isiginesha nokhiye oyimfihlo uhlala kudivayisi yakho.

Ungasayina kanjani i-PDF Mahhala

1. Beka i-PDF yakho

Hudula i-PDF endaweni yokudonsela phansi ngenhla, noma chofoza ukuze uphequlule. Umhleli uzivula ngokuzenzakalelayo nge-Certify modal ekhethwe kusengaphambili — akukho ukuzulazula kumamenyu, akukho ukusesha ithuluzi lokusayina.

2. Dweba, thayipha, noma layisha isiginesha yakho

I-Certify modal inikeza izindlela ezintathu zokuya kusiginisha ebonakalayo: dweba ngegundane lakho, i-trackpad, noma ngomunwe esikrinini esithintwayo; thayipha igama lakho ngefonti yesiginesha engokoqobo; noma layisha i-PNG / JPG yesiginisha yakho ekhona. Zontathu zikhiqiza umphumela ofanayo ofanayo - khetha ukuthi yikuphi okungokwemvelo kuwe.

3. Engeza isizathu, indawo, nosuku

Ngokwe-PDF 2.0 spec, amasiginesha e-cryptographic anesizathu sokuzikhethela (isb. "Ngingumbhali"), indawo (isb. "Berlin, Germany"), nezinkambu zedethi. Abaqinisekisi babona lokhu eduze kwesimo se-crypto. Sigcwalisa ngokuzenzakalelayo usuku; gcwalisa okusele uma umongo ukubiza.

4. Beka isignesha bese usayina

Chofoza noma yikuphi ekhasini ukuze uwise unxande wesiginesha obonakalayo. Hudula ukuze ushintshe usayizi. Chofoza Londoloza. Senza ukhiye omusha we-RSA-2048 + isitifiketi esizisayinele esipheqululini sakho, sibale i-SHA-256 hash yohlu lwebhayithi yedokhumenti, sihlanganise i-PKCS#7 yedatha esayiniwe, bese siyishumeka kokuthi PDF. Ifayela esayiniwe lilandwa ngokushesha.

Kungani Lesi KuyiSisayini Samahhala Samahhala se-PDF

100% yendawo — akukho ukubandakanyeka kweseva

I-PDF yakho, isiginesha yakho edwetshiwe, isitifiketi sakho osilayishile, ukhiye wakho wangasese — akukho namunye kukho othinta iseva. Qhathanisa: Adobe, Smallpdf, iLovePDF, DocuSign, kanye ne-Sejda konke layisha yonke into. Uma idokhumenti iyinkontileka esayiniwe, i-NDA, imbuyiselo yentela, noma ukukhululwa kwezokwelashwa, okubaluleke kakhulu kunanoma iyiphi enye indawo kuwebhu.

I-cryptography yangempela, isigaba samahhala

I-Smallpdf kanye ne-iLovePDF zikunikeza isiginesha ebonakalayo ezigabeni zazo zamahhala - umbhalo obhalwe phansi ekhasini ongenabo ubufakazi be-cryptographic. Lokho "isignesha ye-elekthronikhi", ebuthakathaka ngokomthetho. Sikunikeza amasiginesha edijithali e-PKCS#7 / CMS mahhala, ukusetshenziswa okufanayo okujwayelekile kwe-Adobe Acrobat Pro (kufakwe esangweni ngemuva kokubhaliselwe okungu-$15/mo lapho).

Izitifiketi ezisheshayo zokuzisayina

Ukugeleza kokusayina okuningi kwe-cryptographic kudinga isitifiketi esikhishwe ngaphambilini. Senza i-keypair entsha ye-RSA-2048 nesitifiketi se-X.509 esizisayinele esipheqululini sakho nge-Web Crypto API — ukusetha iqanda. Layisha ekhona .p12 / .pfx uma ufuna ukwethenjwa okuvela eceleni; ngaphandle kwalokho isitifiketi esizisayinele sanele ukusisebenzisa komuntu siqu kanye nokugeleza komsebenzi wamabhizinisi amancane.

Iyabonakala + i-cryptographic endaweni eyodwa

Amathuluzi amaningi amahhala akuphoqa ukuthi ukhethe elilodwa. Siyawapakisha: isiginesha yakho ebonakalayo edwetshiwe ihlala ekhasini FUTHI i-PDF iphethe isiginesha ye-cryptographic efakazela ukuthi ubani osayinile nokuthi idokhumenti ayizange ishintshwe. Kokubili kupasi elilodwa lokulondoloza.

Ukuqinisekisa okuzenzakalelayo kulayishiwe

Beka i-PDF esayiniwe futhi sibonisa isibhengezo sokuqinisekisa — esivumelekile / esingavumelekile / okhiphayo ongathenjwa — eduze kwemininingwane yesitifiketi somsayini. Izimbangi ngokuvamile zibonisa kuphela isithombe esisayinwe; kufanele ukuthathe ngokukholwa.

Amaketanga aneziginesha eziningi

Sayina, thumela kubalingani, basayine bese bebuyisela emuva. Imodeli ye-byte-range ye-PDF isekela noma iyiphi inombolo yamasignesha alandelanayo; isiginesha entsha ngayinye ihlanganisa ezandulele, ikhiqiza iketango elingaqinisekiswa. Umhleli wethu uphatha ukusayinda kabusha ngaphandle kokwenza isiginesha yangaphambilini ingasebenzi.

Impela Mahhala, Phakade

Akukho sivivinyo, akukho tier ye-premium, akukho nkokhelo yesiginesha ngayinye. I-Adobe Acrobat Pro ingu-$15/mo; I-DocuSign Personal ingu-$15/mo; I-Smallpdf Pro ingu-$12 ngenyanga. Wonke alayisha ifayela lakho noma adinga ukubhalisa ukuze asayine nge-cryptographic. Sisekelwa izikhangiso futhi simahhala kuze kube phakade.

Ayikho i-akhawunti, ayikho i-imeyili

Qala ukusayina ngokushesha. Akukho ukubhalisa, akukho ukuthwebula kwe-imeyili, akukho khadi lesikweletu.

Isebenza ungaxhunyiwe ku-inthanethi

Uma umhleli eselayishile unganqamula ku-inthanethi futhi uqhubeke nokusayina. Ilungele izinkontileka ezibucayi, ama-NDA, nemibhalo yomuntu siqu yezezimali.

Amasiginesha E-elekthronikhi vs

Isiginesha ye-elekthronikhi (SES — Ilula)

Noma yiluphi uphawu olubonakalayo kudokhumenti yedijithali: igama elithayiphiwe, umbhalo odwetshiwe, isiginesha ye-ink emanzi eskeniwe, ibhokisi lokuthikha "Ngiyavuma". Iqashelwa ngokomthetho ezindaweni eziningi zebhizinisi lansuku zonke (isigaba se-EU eIDAS SES, i-US ESIGN / UETA, Umthetho Wezokuxhumana Ngogesi wase-UK) kodwa kulula ukungenela umncintiswano uma osayinileyo ephika kamuva ukusayina — abukho ubufakazi obuyimfihlo bokuthi ubani okhiqize uphawu. Imodi yethu "ebonakala kuphela" ikhiqiza lokhu.

Isiginesha ye-elekthronikhi ethuthukisiwe (AES)

Isigaba 2 somthetho we-eIDAS we-EU. Kumelwe (a) ihlonze ngokukhethekile osayindayo, (b) ibe ngaphansi kokulawula komuntu osayinayo kuphela, (c) ithole ukuphazamisa kwangemva kokusayina, (d) idalwe kusetshenziswa idatha umsayindi angayigcina ngaphansi kokulawula kwakhe yedwa. Okukhiphayo kwethu kwe-cryptographic (i-PKCS#7 nge-SHA-256 nge-RSA-2048 kanye nokhiye oyimfihlo okhiqizwe endaweni ngesitoreji se-Web Crypto esingakhipheki) uhlangabezana nazo zonke izimo ezine — ungafuna isimo se-AES ukuze uthole i-PDF esayinwe lapha.

Isiginesha ye-elekthronikhi efanelekile (QES)

Isigaba 3 somthetho we-eIDAS we-EU. I-AES kanye nesitifiketi esiqeqeshiwe esivela ku-Trust Service Provider (TSP) ohlwini oluthenjiwe lwe-EU, kanye nedivayisi yokudala isiginesha efanelekayo (i-HSM noma i-smartcard). I-QES ilingana ngokomthetho nesiginesha yoyinki omanzi kuyo yonke i-EU. Asikhiqizi i-QES ngoba ukugeleza kwesiphequluli kuphela akukwazi ukuhlangabezana nemfuneko yedivayisi yokudala isiginesha esekelwe kuhadiwe — udinga idivayisi ezinikele yokusayina noma i-HSM yefu. Uma icala lakho lokusebenzisa lidinga i-QES (izinkontileka ezigunyaziwe, izimboni ezithile ezilawulwayo), udinga i-Adobe Sign, i-DocuSign EU Qualified, noma i-TSP yendawo.

Umthetho wase-US (ESIGN / UETA)

Umthetho we-US federal ESIGN Act (2000) kanye nokutholwa kwe-UETA yesifunda kuphatha amasiginesha amaningi e-elekthronikhi njengalingana ngokomthetho ne-wet-inki - ngaphandle kwesikimu esinezigaba ze-EU. Ukuze isiginesha iphoqelelwe: (a) zombili izinhlangothi kufanele zivume ukusayina ngekhompuyutha, (b) isiginesha kufanele ibe ngamabomu, (c) amarekhodi kufanele agcinwe. Zonke lezi ziyasebenza; okukhiphayo kuhlangana nabo. Ezinye izinhlobo zemibhalo ethile ziqoshwe (izincwadi zefa, izindaba zomthetho womndeni, ezinye izinkantolo) - hlola isimo sakho.

PDF Edit vs Adobe, Smallpdf, iLovePDF, DocuSign, Sejda

Isici	PDF Hlela	Adobe	Smallpdf	iLovePDF	DocuSign	Sejda
Amafayela alayishwa kuseva?	No — 100% local	Yebo	Yebo	Yebo	Yebo	Yebo
Amasiginesha e-Cryptographic esigabeni samahhala?	Yes — PKCS#7 / CMS	Kukhokhiwe ($15/mo)	Kukhokhiwe ($12/mo)	Ikhokhiwe	Kukhokhiwe ($15/mo)	Ikhokhiwe
Amasiginesha abonakalayo mahhala?	Yes	Yebo	2/ngosuku mahhala	Isigaba samahhala sikhawulelwe	Ikhokhiwe	Isigaba samahhala sikhawulelwe
Isiphequluli esizibhalisele ngokwakho?	Yes — auto	Idinga ukungenisa	Cha	Cha	Cha	Cha
Layisha eyakho i-.p12 / .pfx?	Yes	Yebo (kukhokhelwe)	Cha	Cha	Yebo (kukhokhelwe)	Cha
Kuyadingeka i-akhawunti?	Never	Isigaba samahhala sikhawulelwe	I-imeyili iyadingeka	Isigaba samahhala sikhawulelwe	I-imeyili iyadingeka	Isigaba samahhala sikhawulelwe
Uphawu lwamanzi emphumeni?	No	Cha	Cha	Cha	Cha	Cha
Kuyasebenza ngaphandle kwe-inthanethi emva kokulayishwa?	Yes	Cha	Cha	Cha	Cha	Cha
Qinisekisa amasiginesha angenayo?	Yes — auto banner	Yebo	Ngokwengxenye	Ngokwengxenye	Yebo	Ngokwengxenye
Izindleko zonyaka zokusayina nge-cryptographic?	$0	~$180/yr	~$144/yr	~$80/yr	~$180/yr	~$80/yr

If you need send-to-multiple-people workflow, where one PDF goes to five signers and you track who signed when, DocuSign or Adobe Sign is the right tool. For you signing your own documents — contracts you received, vendor agreements, NDAs, tax forms — we cover the exact same cryptographic capability for free, without uploading anything.

Ubani Osayina ama-PDFs Kanje?

Ama-freelancers asayina izinkontileka

Iklayenti lithumela i-SOW noma i-retainer. Uyasayina, isitembu se-crypto, thumela emuva. Akukho okulayishiwe ku-DocuSign, awekho ama-imeyili "esivivinyo samahhala", akukho ukubhaliswa kwe-Adobe — futhi isiginesha inamandla ngokusemthethweni kune-JPG scribble ngoba isekelwa yi-PKCS#7 crypto.

HR kanye namafomu okuqashwa

Izincwadi zokunikezwa, ama-NDA, amaphakethe okugibela, ama-W-9, amafomu okubanjelwa intela. Kuzwela kangangokuba ukulayisha kusayithi lokusayina lamahhala akulungile. Sayina endaweni, thumela emuva nge-imeyili.

Ukukhishwa kwezokwelapha namafomu e-HIPAA

Izigunyazo ezisayiniwe zamarekhodi ezokwelapha, izimangalo zomshwalense, noma amafomu okukhishwa kokuhlolwa. Okuqukethwe okumbozwe yi-HIPAA akufanele kulayishwe kuseva yomuntu ongamazi. Izindaba zokusayina zendawo kuphela.

Izincwadi ezisemthethweni

Izincwadi zokuthembisana imali, izivumelwano zokukhokha, izimemezelo, izitatimende ezifungelwe. Lapho ilungelo linamathiselwe khona, idokhumenti akufanele ishiye idivayisi yakho ngesikhathi sokusayina. Ukugeleza kwethu kwendawo kuyakugcina lokho.

Izivumelwano zezindlu nezindawo zokuqasha

Izinkontileka zokuqasha, izichibiyelo zokuqashisa, ukudalulwa kwezakhiwo. Sayina futhi ubuyisele ngaphandle kokubhalisa enye futhi inkundla yokusayina. Inkampani esebenzisana nayo ithola i-PDF esayiniwe eqinisekiswe ngokuyimfihlo futhi angayivula kunoma yisiphi isibukeli.

Uhulumeni kanye namafomu entela

Amafomu e-IRS (W-9, 1099), izicelo zikahulumeni, imibhalo yokuthuthela kwelinye izwe. Ama-ejensi amaningi amukela i-PKCS#7 esayiniwe PDFs. Ukusayina kwasendaweni kugwema ukulayisha umazisi obucayi.

Ababhali nabanikazi bamalungelo

Sayina umsebenzi wedijithali ukuze ufakazele ubunikazi ngesikhathi esithile. Isiginesha ye-PKCS#7 + isitembu sesikhathi ku-PDF esayiniwe iyirekhodi elihlala njalo, elisekelwa ukhiye wakho oyimfihlo.

Izinqumo zebhodi lebhizinisi

Amaminithi ebhodi, izinqumo zemvume, izibonelelo zokukhethwa kwesitoko. Ukusekelwa kochungechunge lwabasayini abaningi kuvumela abaqondisi basayine ngokulandelana ngaphandle kokudlulisela i-PDF ngefu lenkampani yangaphandle.

Ingobo yomlando yedokhumenti yesikhathi eside

Sayina i-PDF ebalulekile namuhla ngesiginesha ye-cryptographic enesitembu sosuku. Gcina endaweni. Ngemva kweminyaka, noma ubani onefayela usengaqinisekisa ukuthi lisayinwe umnikazi wokhiye wakho oyimfihlo futhi alikaze lishintshwe kusukela ngaleso sikhathi. (Ukuze uthole ukugeleza kokusebenza kokuqinisekisa kwesikhathi eside okunezitembu zesikhathi ezithenjwayo, bheka isigaba se-FAQ ku-LTV.)

Sayina i-PDF ku-iPhone, Android, Mac, Windows, kanye ne-Chromebook

Isisayini sethu se-PDF sisebenza kuwo wonke amadivayisi anesiphequluli sesimanje — Windows, Mac, Linux, Chromebook, iPad, iPhone, ne-Android. Ku-iPad Pro ene-Apple Pencil, ukudweba isiginesha yakho kuzwakala njengokungathi ncamashi nohlelo lokusebenza lweselula lwe-DocuSign, khipha okubhalisile bese ususa okulayishiwe. Akukho ukufakwa kohlelo lokusebenza, awekho ama-plugin, awekho amalungelo okuphatha. Uma ikhasi selilayishiwe unganqamula ku-inthanethi futhi uqhubeke nokusayina - yonke into isebenza endaweni nge-Web Crypto API.

Ngabe Kusebenza Kanjani Ukusayina Okusekelwe Kusiphequluli I-Cryptographic PDF?

Uma uchofoza u-Londoloza, sikhiqiza ibhangqa yokhiye entsha ye-RSA-2048 esipheqululini sakho sisebenzisa i-Web Crypto API (crypto.subtle.generateKey) — ukhiye oyimfihlo uhlala endaweni yokugcina ekhiphekayo futhi awukwazi ukuthunyelwa ngaphandle. Sakha isitifiketi esizisayinele se-X.509 esinegama olikhethile lokusayina. I-PDF ilungiswa ngesibambi sendawo /Sig esingenalutho ngaphakathi kwenkambu ye-/AcroForm. Sibala i-SHA-256 hash yobubanzi bebhayithi yedokhumenti singafaki isimeli. I-hashi isayinwe ngokhiye wakho oyimfihlo nge-crypto.subtle.sign (RSA-PKCS1-v1_5 nge-SHA-256). Sakha isakhiwo se-PKCS#7 / CMS SignedData esiqukethe isiginesha, isitifiketi sakho, isikhathi sokusayina, nanoma yisiphi isizathu/imethadatha yendawo. I-PKCS#7 blob ifakwe ngekhodi nge-DER futhi ishumekwe kunkambu ye-PDF's /Sig. Ifayela liyalandwa. Sonke isibukeli sesimanje se-PDF (Adobe, Chrome, Edge, Foxit, Preview, Firefox) sifunda isakhiwo se-PKCS#7 lapho sivuliwe, sibuyisela i-hashi yedokhumenti, siqinisekise isiginesha ngokumelene nesitifiketi esishumekiwe, futhi sibonisa ibheji yokuqinisekisa. Yonke i-crypto isebenza esipheqululini sakho — akukho seva, akukho okulayishiwe, akukho telemetry.

imibuzo ejwayelekile ukubuzwa

Ngisayina kanjani i-PDF mahhala?

Beka i-PDF yakho ekhasini elingenhla. Umhleli uvula ngemodi yesitifiketi ekhethwe kusengaphambili. Dweba, thayipha, noma layisha isiginesha yakho. Chofoza ikhasi ukuze ulibeke. Chofoza Londoloza. Imahhala, indawo, ayikho i-watermark.

Ngiyengeza kanjani isiginesha ku-PDF?

Ukugeleza okufanayo — wisa, dweba, beka, gcina. "Sayina" futhi "engeza isiginesha" kukhiqiza umphumela ofanayo ethuluzini lethu.

Ingabe lawa masignesha ayabophezela ngokomthetho?

Yebo emawundeni amaningi okunquma amacala. Imiphumela yethu ye-cryptographic ifihlekile ngokuvumelana ne-EU eIDAS "Advanced Electronic Signature" futhi inelisekisa izidingo ze-US ESIGN / UETA. Ngamaxwebhu abhalwe ngu-notary noma izinqubo ze-QES eziqondene, udinga isitifiketi esikhishwe yi-TSP esingakwazi ukukivelisa ku-browser — sebenzisa i-Adobe Sign noma i-TSP kazwelonke.

Ingabe i-PDF yami ilayishiwe?

Cha. Ukusayina kwenzeka ngokuphelele esipheqululini sakho. I-PDF yakho, isiginesha, nokhiye oyimfihlo awulokothi uthinte iziphakeli zethu.

Uyini umehluko phakathi kwamasignesha kagesi nawedijithali?

I-elekthronikhi = noma yiluphi uphawu olubonakalayo (ukubhala, igama elithayiphiwe, isithombe). Idijithali = ukusebenza kwe-cryptographic okufakazela ubunikazi + ubuqotho. Senza kokubili, sinamathiselwe kuphasishi yesiginesha eyodwa. Izimbangi eziningi zamahhala zenza i-electronic kuphela.

Yini i-PKCS#7?

Umbhalo wekhodi ojwayelekile wedatha esayiniwe kuma-PDFs. Zonke izibukeli zesimanje ze-PDF zifunda i-PKCS#7 / CMS ngokwemvelo. Okuphumayo kwethu kuthobelana ncamashí - ifomethi efanayo Adobe Acrobat Pro isebenzisa.

Ingabe i-PDF esayiniwe izosebenza ku-Adobe?

Yebo. Adobe Acrobat Reader / Pro, Chrome, Edge, Firefox, Foxit, macOS Preview — konke kuqinisekisa amasiginesha ethu. Izitifiketi ozisayinayo zibonisa isexwayiso "somuntu osayinayo ongaziwa" (ukuziphatha okufanele); layisha i-.p12 evela ku-CA ethembekile ukuze kuqinisekiswe ibheji eluhlaza.

Ngingakwazi ukulayisha isitifiketi sami esikhona?

Yebo. Ku-Certify modal khetha "Sebenzisa isitifiketi esikhona" bese ulayisha ifayela lakho elithi .p12 noma .pfx (nephasiwedi uma ikhona). Isitifiketi sicutshungulwa endaweni - asikaze sidluliselwe.

Ingabe abantu abaningi bangasayina i-PDF efanayo?

Yebo, ngokulandelana. Sayina futhi ulande. Umamukeli uyayivula lapha aphinde asayine. Isiginesha ngayinye ihlanganisa ezangaphambili - iketango eliqinisekiswa.

Ngingakwazi ukusayina i-PDF efonini yami?

Yebo. Isebenza ku-iPhone Safari, iPad (ikakhulukazi nge-Apple Pencil — izwakala njenge-DocuSign Mobile), Android Chrome. Dweba ngomunwe wakho.

Ngingakwazi ukusayina i-PDF evikelwe ngephasiwedi?

Yebo uma ikhiyiwe ngumshumeli, cha uma ikhiyiwe umsebenzisi. Uma ikhiyiwe ngumshumeli, ukusayina kusebenza ngqo. Uma ikhiyiwe umsebenzisi (iphasiwedi iyadingeka ukuvula), yivule nge /unlock-pdf kuqala. Zombili izithuluzi zisebenza endaweni eyodwa.

Ingabe isebenza ungaxhunyiwe ku-inthanethi?

Yebo, uma umhleli eselayishile. Injini yokusayina isebenza esipheqululini sakho.

Kuthiwani ngamasiginesha anesitembu sesikhathi (RFC 3161)?

Akusekelwa okwamanje - izitembu zesikhathi zidinga ucingo lwenethiwekhi oluya ku-TSA yangaphandle ephula isithembiso sethu sasendaweni kuphela. Ukuze uthole ukugeleza komsebenzi wokuqinisekisa isikhathi eside (i-LTV), sebenzisa i-Adobe Acrobat Pro noma isevisi yokusayina yezentengiso.

Ingabe oqinisekisayo uzobona isitifiketi sami esizisayinele njengesivumelekile?

Cha — bazobona isexwayiso sika "umphathi ongaziwa" ngoba izitifiketi ezizisayinele zona aziboshelelwa kuzincele ze-CA zesizinda esithembekile. Isimpawu ngokwaso I-ngcwele i-cryptographically — isicelo sabantu sidinga ukwethembeka kwesithathu. Ukusetshenziswa komntu kuyenela; ukusetshenziswa kwezomthetho/kwezohwebo, layisha ifayela .p12 evela ku-CA ethembekile.

Ingabe umamukeli angakwazi ukuhlela i-PDF esayiniwe?

Cha — uma behlunga, isimpawu se-cryptographic sizofa futhi naliphi na iqinisekisi libona "isimpawu asisebenzi, uxwebhu lwaguqulwa ngemuva kwesayinwa". Lokhu yilona khona ukuvimbela ukwephulwa okwenza izimpawu zedijithali zibe nencazelo yezomthetho.

Ingabe isiginesha yami izoba ne-watermark?

Cha. I-PDF yakho esayiniwe iqukethe ncamashi isiginesha yakho — azikho izitembu zokuthi "Isayinwe ngeFreeTool", azikho izikhangiso, azidayisi. Okusayinayo yikho okuthunyelwayo.

Ingabe ukhona umkhawulo kasayizi wefayela?

Awukho umkhawulo wokwenziwa. Inkumbulo yedivayisi iwusilingi kuphela.

Ingabe lesi isisayini samahhala se-PDF esingcono kakhulu?

Yebo — ngezinqubo zomsebenzi eziqondene nobumfihlo nanokuthola izimpawu ze-cryptographic emazingeni amahhala, sicabanga kunjalo. Ngokuphathwa kokuphathwa kwenqubo yezinhlangothi eziningi (thumela kubabhalisi abahlanu, landelela isimo), i-DocuSign noma i-Adobe Sign yizithuluzi ezifanele — uhlobo olukahlukene.

About this tool: PDF Edit is built by a small independent team who were tired of PDF tools that required accounts, uploaded files to servers we didn't control, and gated cryptographic signing behind subscriptions. Everything here runs in your browser — your PDF, your signature drawing, and your private key stay on your device. The signing engine uses the Web Crypto API for RSA key generation and hashing, and produces PKCS#7 / CMS signatures that validate in every modern PDF viewer. Free forever, ad-supported.

Last updated: 2026-05-13