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 PDF — Mahala, yabucala, yeCryptographic

Imisayino ebonakalayo KUNYE nesignitsha yokwenyani ye-cryptographic digital (PKCS#7) — zombini simahla, zombini zalapha, zombini zamkelwe ngokusemthethweni

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% Simahla Ngonaphakade Akufuneki Akhawunti 100% Kwisixhobo Sakho Ukuthinjwa Kokomkhosi

Iifayile azisuki kwisixhobo sakho

Ukuthinjwa kwe-AES-256

Asikwazi ukubona amaxwebhu akho

Akukho mdibaniso ofunekayo

Beka i-PDF yakho apha

okanye

PDF · Akukho kulayishwa — utyikityo & nesitshixo sabucala hlala kwisixhobo sakho.

Utyikitya njani i-PDF Mahala

1. Lahla i-PDF yakho

Tsala i-PDF kwindawo yokulahla ngasentla, okanye ucofe ukukhangela. Umhleli uvula ngokuzenzekelayo ngeCertiification modal ekhethwe kwangaphambili — akukho navigation ngokusebenzisa iimenyu, akukho phendla isixhobo sokusayina.

2. Zoba, chwetheza, okanye ufake isiginitsha yakho

I-modal yeSiqinisekiso inikezela ngeendlela ezintathu kumsayino obonakalayo: zoba ngemouse yakho, i-trackpad, okanye umnwe kwiscreen sokuchukumisa; chwetheza igama lakho kwifonti yotyikityo eyinyani; okanye ulayishe iPNG / JPG yomsayino wakho okhoyo. Zontathu zivelisa iziphumo ezifanayo - khetha nokuba yeyiphi na eyendalo kuwe.

3. Yongeza isizathu, indawo kunye nomhla

Ngokwe-PDF 2.0 spec, i-cryptographic signatures ithwala isizathu sokuzikhethela (umzekelo "Ndim umbhali"), indawo (umzekelo "eBerlin, eJamani"), kunye nemihlaba yomhla. Abaqinisekisi babona oku ecaleni kwemo ye-crypto. Sizizalisa ngokuzenzekela umhla; gcwalisa okuseleyo ukuba umxholo ufuna oko.

4. Beka utyikityo kwaye usayine

Cofa naphi na kwiphepha ukulahla uxande olubonakalayo lomsayino. Tsala ukuze wenze ubungakanani kwakhona. Cofa Gcina. Senza isitshixo esitsha seRSA-2048 + isatifikethi esizityikitye ngokwakho kwisikhangeli sakho, sibale i-SHA-256 hash yoluhlu lwebhayithi yoxwebhu, ipakethe i-PKCS#7 iblobhu yedatha esayiniweyo, kwaye uyifake kwi-PDF. Ifayile esayiniweyo ikhutshelwa ngoko nangoko.

Kutheni le Yeyona Msayini waMahla we-PDF wasimahla

I-100% yendawo - akukho nxaxheba yomncedisi

I-PDF yakho, utyikityo lwakho oluzotyiweyo, isatifikethi sakho esilayishiweyo, isitshixo sakho sabucala — akukho nanye ichukumisa iseva. Thelekisa: Adobe, Smallpdf, iLovePDF, DocuSign, kunye neSejda zonke zilayishe yonke into. Xa uxwebhu luyinkontileka esayiniweyo, i-NDA, ukubuyiswa kwerhafu, okanye ukukhululwa kwezonyango, okubaluleke kakhulu kunayo nayiphi na enye indawo kwiwebhu.

I-cryptography yokwenyani, inqanaba lasimahla

I-Smallpdf kunye ne-iLovePDF zikunika utyikityo olubonakalayo kwimigangatho yazo yasimahla - isikribhuli esibhalwe kwiphepha esingenabungqina be-cryptographic. Leyo yi "signature ye-elektroniki", ibuthathaka ngokusemthethweni. Sikunika PKCS#7 / CMS digital signatures simahla, umgangatho ofanayo Adobe Acrobat Pro isebenzisa (gated ngasemva $15/mo umrhumo apho).

Izatifikethi ozityikitye ngoko nangoko

Uninzi lokutyikitya okufihlakeleyo lufuna isatifikethi esikhutshwe kwangaphambili. Senza i-RSA-2048 entsha yesitshixo kunye nesatifikethi se-X.509 esizisayinele kwibhrawuza yakho ngeWeb Crypto API — zero setup. Layisha ekhoyo .p12 / .pfx ukuba ufuna intembeko yomntu wesithathu; ngaphandle koko isiqinisekiso esizisayinileyo sanele ukusetyenziswa komntu kunye nokuhamba komsebenzi kwamashishini amancinci.

Iyabonakala + i-cryptographic kwipasi enye

Uninzi lwezixhobo zasimahla ziyakunyanzela ukuba ukhethe enye. Siyazipakisha: utyikityo lwakho olubonakalayo oluzotyiweyo luhlala kwiphepha KWAYE i-PDF iphethe utyikityo olufihlakeleyo olungqina ukuba uxwebhu alutshintshwanga. Zombini kwipasi enye yokugcina.

Ukuqinisekiswa okuzenzekelayo kumthwalo

Shiya i-PDF esayiniweyo kwaye sibonisa ibhena yokuqinisekisa - esebenzayo / engasebenziyo / umkhuphi ongathenjwa - ecaleni kweenkcukacha zesatifikethi somtyikityi. Abakhuphisana badla ngokubonisa umfanekiso wesiginitsha kuphela; kufuneka uyithabathe ngokholo.

Amakhonkco amaninzi

Sayina, thumela kwi-counterparty, basayine kwaye bathumele emva. PDF's byte-range imodeli ixhasa naliphi na inani lemisayino elandelelanayo; Utyikityo olutsha ngalunye lugubungela ezingaphambili, luvelisa ikhonkco elingqinisisekayo. Umhleli wethu uphatha ukutyikitya kwakhona ngaphandle kokwenza utyikityo lwangaphambili lungasebenzi.

Ngenene Mahala, Ngonaphakade

Akukho tyala, akukho nqanaba leprimiyamu, akukho ntlawulo yomsayino ngamnye. Adobe Acrobat Pro yi $15/mo; I-DocuSign Personal yi-$ 15 / mo; I-Smallpdf Pro yi-$12/mo. Bonke bafaka ifayile yakho okanye bafuna umrhumo wokusayinwa kwe-cryptographic. Siyaxhaswa kwaye sisimahla ngonaphakade.

Akukho akhawunti, akukho imeyile

Qalisa ukusayina kwangoko. Akukho kubhaliswa, akukho kubanjwa kwe-imeyile, akukho khadi letyala.

Isebenza ngaphandle kweintanethi

Xa umhleli elayishile ungaqhawula kwi-intanethi kwaye uqhubeke nokusayina. Inkulu kwiikhontrakthi ezinovakalelo, ii-NDA, kunye namaxwebhu omntu wemali.

Imisayino ye-Electronic vs

Isiginitsha yombane (SES — Ilula)

Naluphi na uphawu olubonakalayo kuxwebhu lwedijithali: igama elichwetheziweyo, isicatshulwa esizotyiweyo, umsayino we-inki eskeniweyo, ibhokisi yokukhangela "Ndiyavuma". Ivunywe ngokusemthethweni kwiindawo ezininzi zoshishino lwemihla ngemihla (i-EU eIDAS SES tier, US ESIGN / UETA, UK Electronic Communications Act) kodwa kulula ukukhuphisana ukuba umsayini kamva uyala ukusayina - akukho bungqina obufihlakeleyo bokuba ngubani ovelise uphawu. Indlela yethu "ebonakalayo kuphela" ivelisa oku.

Utyikityo lwe-elektroniki olukwinqanaba eliphambili (AES)

Inqanaba 2 lolawulo lwe-eIDAS ye-EU. Kufuneka (a) lichaze ngokukodwa umtyikityi, (b) libe phantsi kolawulo lomsayini kuphela, (c) libone ukuphazamisana kwangethuba lokusayina, (d) lidalwe kusetyenziswa idatha umtyikityi anokuyigcina phantsi kolawulo lwakhe yedwa. Imveliso yethu ye-cryptographic (i-PKCS#7 ngaphezulu kwe-SHA-256 kunye ne-RSA-2048 kunye nesitshixo sabucala esenziwe ekuhlaleni kwindawo yokugcina i-Crypto yewebhu engatsaliyo) ihlangabezana nazo zone iinqobo - ungabanga ubume be-AES nge-PDF esayinwe apha.

Umsayino wombane ofanelekileyo (QES)

Inqanaba lesi-3 lolawulo lwe-eIDAS ye-eIDAS. I-AES kunye nesatifikethi esiqinisekisiweyo esivela kuMboneleli weNkonzo weTrust (TSP) kuluhlu oluthenjiweyo lwe-EU, kunye nesixhobo sokwenza utyikityo olufanelekileyo (HSM okanye i-smartcard). I-QES ilingana ngokusemthethweni nomsayino we-inki emanzi kwi-EU iphela. Asivelisi i-QES ngenxa yokuba ii-browser kuphela azikwazi ukuhlangabezana nemfuneko yesixhobo sokwenza utyikityo esekwe kwi-hardware — udinga isixhobo sokusayina esizinikeleyo okanye i-HSM yelifu. Ukuba imeko yakho yosetyenziso ifuna i-QES (izivumelwano ezibhalisiweyo, amashishini athile alawulwayo), udinga i-Adobe Sign, i-DocuSign EU Qualified, okanye i-TSP yendawo.

Umthetho wase-US (SIGN / UETA)

Umthetho we-US federal ESIGN Act (2000) kunye nokwamkelwa kwe-UETA karhulumente kuphatha iisignisha ezininzi ze-elektroniki njengezilingana ngokusemthethweni ne-inki emanzi - ngaphandle kweskim se-EU's tiered. Ukuze utyikityo lube nokunyanzeliswa: (a) omabini amaqela kufuneka avume ukusayina ngekhompyutha, (b) utyikityo kufuneka lube ngabom, (c) iirekhodi kufuneka zigcinwe. Zonke ezi ziyasebenza; imveliso yethu idibana nabo. Ezinye iintlobo zamaxwebhu athile ziqingqwe (imiyolelo, imicimbi yosapho-mthetho, ezinye iifayili zenkundla) - khangela imeko yakho.

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

Isimbo	PDF Hlela	Adobe	Smallpdf	iLovePDF	DocuSign	Sejda
Iifayile akhuphiwe kumsebenzi?	No — 100% local	Ewe	Ewe	Ewe	Ewe	Ewe
Utyikityo lweCryptographic kwinqanaba lasimahla?	Yes — PKCS#7 / CMS	Ihlawulwe ($15/mo)	Ihlawulwe ($12/mo)	Ihlawulwe	Ihlawulwe ($15/mo)	Ihlawulwe
Utyikityo olubonakalayo simahla?	Yes	Ewe	2/usuku simahla	Inqanaba lasimahla lilinganiselwe	Ihlawulwe	Inqanaba lasimahla lilinganiselwe
Uzityikitye ngokwakho kwibhrawuza?	Yes — auto	Ifuna ngaphandle	Hayi	Hayi	Hayi	Hayi
Layisha eyakho .p12 / .pfx?	Yes	Ewe (ihlawulwe)	Hayi	Hayi	Ewe (ihlawulwe)	Hayi
I-Account ifunekayo?	Never	Inqanaba lasimahla lilinganiselwe	I-imeyile iyafuneka	Inqanaba lasimahla lilinganiselwe	I-imeyile iyafuneka	Inqanaba lasimahla lilinganiselwe
Uphawu lwamanzi kumkhiphelo?	No	Hayi	Hayi	Hayi	Hayi	Hayi
Isebenza i-offline ngemuva kokusindayo?	Yes	Hayi	Hayi	Hayi	Hayi	Hayi
Qinisekisa imisayino engenayo?	Yes — auto banner	Ewe	Ngokukodwa	Ngokukodwa	Ewe	Ngokukodwa
Iindleko zonyaka zokusayina ngokufihlakeleyo?	$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.

Ngubani osayina ii-PDFs ngolu hlobo?

Abasebenzi abazimeleyo abasayina izivumelwano

Umxhasi uthumela i-SOW okanye umgcini. Uyasayina, isitampu se-crypto, thumela umva. Akukho kufakwa kwi-DocuSign, akukho "ilingo lasimahla" imeyile, akukho Adobe umrhumo - kwaye utyikityo lomelele ngokusemthethweni kune-JPG scribble kuba ixhaswa yi-PKCS#7 crypto.

HR kunye neefom zengqesho

Iileta, ii-NDA, iipakethi zokukhwela, ii-W-9, iifomu zokubamba irhafu. Kunobuntununtunu ngokwaneleyo ukuba ukulayisha kwindawo yokusayina simahla akulunganga. Sayina ekuhlaleni, thumela nge-imeyile.

Ukukhutshwa kwezonyango kunye neefom ze-HIPAA

Ugunyaziso olusayiniweyo lweerekhodi zonyango, amabango e-inshurensi, okanye iifomu zokukhupha uvavanyo. Umxholo ogqunywe yi-HIPAA akufuneki ulayishwe kwiseva yomntu ongamaziyo. Imiba yokutyikitya yasekuhlaleni kuphela.

Imbalelwano esemthethweni

Iileta zothethathethwano, izivumelwano zokulungisa, izibhengezo, iingxelo ezifungelweyo. Apho ilungelo lincamathele khona, uxwebhu akufuneki lushiye isixhobo sakho ngexesha lokusayina. Ukuhamba kwethu kwendawo kuyayigcina loo nto.

Izivumelwano zokuhlala kunye nerenti

Izivumelwano zokurenta, izilungiso zengqeshiso, ukubhengezwa kwepropati. Sayina kwaye ubuyise ngaphandle kokubhalisa elinye iqonga lokutyikitya. Iqela lifumana i-cryptographically-verified sign PDF abanokuyivula nakuwuphi na umbukeli.

Urhulumente kunye neefomu zerhafu

Iifom ze-IRS (W-9, 1099), izicelo zikarhulumente, amaxwebhu okufudukela kwelinye ilizwe. Ii-arhente ezininzi zamkela i-PKCS#7 esayiniweyo PDFs. Ukusayina kwasekuhlaleni kuthintela ukufaka amaxwebhu esazisi anovakalelo.

Ababhali kunye nabanini malungelo

Sayina umsebenzi wedijithali ukubonisa ubungqina bobubhali kwindawo ethile ngexesha. I-PKCS#7 isiginitsha + isitampu sexesha kwi-PDF esayiniweyo yirekhodi yobungqina ehlala ixesha elide, exhaswe sisitshixo sakho sabucala.

Izigqibo zebhodi yoshishino

Imizuzu yebhodi, izisombululo zemvume, izibonelelo zokhetho lwesitokhwe. Inkxaso yekhonkco labasayini abaninzi ivumela abalawuli basayine ngokulandelelana ngaphandle kokuthumela i-PDF ngelifu lomntu wesithathu.

Ugcino lwamaxwebhu exesha elide

Sayina i-PDF ebalulekileyo namhlanje ngotyikityo lwe-cryptographic. Gcina ekuhlaleni. Kwiminyaka kamva, nabani na onefayile usengaqinisekisa ukuba isayinwe ngumnini wesitshixo sakho sabucala kwaye ayikatshintshwa ukusukela ngoko. (Ngokwenziwa komsebenzi wokuqinisekisa ixesha elide onesitampu esithembekileyo, bona icandelo le-FAQ kwi-LTV.)

Sayina i-PDF kwi-iPhone, Android, Mac, Windows, kunye ne-Chromebook

Umsayini wethu we-PDF usebenza kwisixhobo ngasinye esinebhrawuza yanamhlanje — Windows, Mac, Linux, Chromebook, iPad, iPhone, kunye ne-Android. Kwi-iPad Pro enePencil ye-Apple, ukuzoba isiginitsha yakho kuvakala kanye njenge-DocuSign's app mobile, thabatha umrhumo kwaye ukhuphe ukulayisha. Akukho kufakwa kwe-app, akukho plugins, akukho malungelo olawulo. Emva kokuba iphepha lilayishiwe ungaqhawula kwi-intanethi kwaye uqhubeke nokusayina - yonke into iqhuba kwindawo nge-Web Crypto API.

Isebenza Njani iSayino eSekwe kwiBhrawuza PDF?

Xa ucofa uGcina, sivelisa i-RSA-2048 entsha yesitshixo kwisikhangeli sakho sisebenzisa iWeb Crypto API (crypto.subtle.generateKey) — isitshixo sabucala sihlala kwindawo yogcino olungenakutsalwa kwaye alukwazi ukuthunyelwa ngaphandle. Sakha isatifikethi se-X.509 esizityikitye ngegama olikhethileyo lomtyikityi. I-PDF ilungiswe ngesibambi-ndawo esingenanto/Sig ngaphakathi kwebala le-/AcroForm. Sibala i-SHA-256 hash yoluhlu lwebyte yoxwebhu ngaphandle kwesibambi-ndawo. I-hash isayinwe ngesitshixo sakho sabucala nge-crypto.subtle.sign (RSA-PKCS1-v1_5 nge-SHA-256). Sakha i-PKCS#7 / CMS SignedData isakhiwo esiqulethe utyikityo, isatifikethi sakho, ixesha lokusayina, kunye nasiphi na isizathu/imetadata yendawo. Iblobho ye-PKCS#7 yi-DER-encoded kwaye ifakwe kwi-PDF's /Sig indawo. Iifayile ezikhutshelweyo. Wonke umbukeli we-PDF wale mihla (Adobe, Chrome, Edge, Foxit, Preview, Firefox) ifunda iPKCS#7 isakhiwo kwindawo evulekileyo, iphinda ibale ihashi yoxwebhu, iqinisekisa utyikityo ngokuchasene nesatifikethi esilungisiweyo, kwaye ibonise ibheji yokuqinisekisa. Yonke i-crypto isebenza kwisikhangeli sakho - akukho seva, akukho kulayisha, akukho telemetry.

Imibuzo ebuzwa qho

Ndiyisayina njani i-PDF simahla?

Beka i-PDF yakho kwiphepha elingentla. Umhleli uvula ngeSiqinisekiso semodyuli ekhethwe kwangaphambili. Zoba, chwetheza, okanye faka utyikityo lwakho. Cofa iphepha ukuze ulibeke. Cofa Gcina. Isimahla, yasekhaya, akukho watermark.

Ndiludibanisa njani utyikityo kwi PDF?

Ukuqukuqela okufanayo — ukuwisa, ukuzoba, indawo, gcina. "Sayina" kwaye "yongeza isiginitsha" ivelisa iziphumo ezifanayo kwisixhobo sethu.

Ngaba ezi zityikityo zibophelela ngokusemthethweni?

Ewe kwezininzi iimantla. Ibukhosi bethu be-cryptographic bufanelana neenqobo ze-EU eIDAS ze-"Advanced Electronic Signature" kwaye linelisile iimfuno ze-US ESIGN / UETA. Kwiminatha yamaxwebhu ashicilelweyo okanye iflow ze-QES ezikhethekileyo udinga isatifikethi esinikezelwe yi-TSP esingenako ukusivelisa kwi-browser — sebenzisa i-Adobe Sign okanye i-TSP yesizwe.

Ngaba i-PDF yam ifakiwe?

Hayi. Utyikityo lwenzeka ngokupheleleyo kwibhrawuza yakho. I-PDF yakho, umsayino, kunye nesitshixo sabucala soze uchukumise iiseva zethu.

Nguwuphi umahluko phakathi kotyikityo lwe-elektroniki kunye nedijithali?

I-Electronic = naluphi na uphawu olubonakalayo (i-scribble, igama elichwetheziweyo, umfanekiso). Idijithali = ukusebenza kwe-cryptographic engqina ubuni + ingqibelelo. Senza sobabini, sibekwe kumsayino omnye. Uninzi lwabakhuphisana basimahla benza i-elektroniki kuphela.

Yintoni i-PKCS#7?

Ukufakwa kweekhowudi okusemgangathweni kwedatha esayiniweyo kwii-PDFs. Wonke umbukeli we-PDF wale mihla ufunda i-PKCS#7 / CMS ngokwemveli. Imveliso yethu ihambelana ngokuthe ngqo - ifomathi efanayo Adobe Acrobat Pro isebenzisa.

Ngaba i-PDF esayiniweyo iza kusebenza kwi-Adobe?

Ewe. Adobe Acrobat Reader / Pro, Chrome, Edge, Firefox, Foxit, macOS Preview - zonke ziqinisekisa utyikityo lwethu. Iziqinisekiso ozityikityileyo zibonisa isilumkiso "somtyikityi ongaziwayo" (ukuziphatha okuchanekileyo); layisha i-.p12 evela kwi-CA ethembekileyo yokuqinisekisa ibheji eluhlaza.

Ndingasifaka isatifikethi sam esele sikhona?

Ewe. Kwi-Certify modal pick "Sebenzisa isatifikethi esikhoyo" kwaye ulayishe ifayile yakho ye-.p12 okanye .pfx (enegama lokugqitha ukuba likhona). Isatifikethi sicazululwa ekuhlaleni - ayisokuze isasazwe.

Ngaba abantu abaninzi banokusayina i-PDF efanayo?

Ewe, ngokulandelelanayo. Sayina kwaye ukhuphele. Umamkeli uyivula apha kwaye asayine kwakhona. Isiginitsha ngasinye sigubungela ezo zangaphambili - ikhonkco eliqinisekisiweyo.

Ndingasayina i-PDF kwifowuni yam?

Ewe. Isebenza kwi-iPhone Safari, iPad (ingakumbi nge-Apple Pensile - ivakalelwa njenge-DocuSign Mobile), Android Chrome. Zoba ngomnwe wakho.

Ndingasayina igama eliyimfihlo elikhuselweyo PDF?

Ewe ukuba ivalwe nguninikazi, hayi ukuba ivalwe ngumsebenzisi. Ukuba ivalwe nguninikazi, ukusayina kusebenza ngokuqobo. Ukuba ivalwe ngumsebenzisi (igama lokugqithisa lifuneka ukuvula), vula nge /unlock-pdf kuqala. Zombini izixhobo zisebenza endaweni yokugcina.

Ngaba iyasebenza ngaphandle kweintanethi?

Ewe, xa umhleli elayishile. Injini yokusayina isebenza kwibrawuza yakho.

Kuthekani ngemisayino yesitampu sexesha (RFC 3161)?

Ayixhaswa okwangoku - izitampu zexesha zifuna umnxeba womnatha oya kwi-TSA yangaphandle eyophula isithembiso sethu sasekhaya kuphela. Ukuqinisekiswa kwexesha elide (LTV) ukuhamba komsebenzi, sebenzisa i-Adobe Acrobat Pro okanye inkonzo yokusayina yorhwebo.

Ngaba umntu oqinisekisayo uya kusibona isatifikethi sam endizisayinileyo njengesisebenzayo?

Hayi — baya kubona isilumkiso se-"umtyikityi akaziwa" kuba izatifikethi ezizityikitizhileyo azixhunyaniswanga kwi-CA ephezulu ethembekileyo. Isimemo ngokwaso SI sebenzisa ngokwe-cryptographic — yeyindlela yokufuna ukuthembeka kwesithathu ukufuna. Ukusetyenziswa komntu kuyenela; ukusetyenziswa kwezomthetho/kwezentengiselwano, layisha ifayile .p12 evela kwi-CA ethembekileyo.

Ngaba umamkeli angahlela i-PDF esayiniweyo?

Hayi — ukuba bayahlela, isimemo se-cryptographic siyaphuka kwaye naliphi na uqinisekisi ubona "isimemo asisebenzi, uxwebhu lwaguqulwa emva kokusayina". Le yayingoqobo inxalenye yophuhliso lwesimemo sedijithali esenza ukuba sibe nentsingiselo yomthetho.

Ngaba utyikityo lwam luya kuba ne-watermark?

Hayi. I-PDF yakho esayiniweyo iqulethe kanye utyikityo lwakho — akukho "Sayinwa ngeFreeTool" izitampu, akukho ntengiso, akukho ntengiso. Into oyisayinayo yiyo ethunyelwayo.

Ngaba kukho umda wobungakanani befayile?

Akukho mda wokwenziwa. Imemori yesixhobo yeyona isilingi kuphela.

Ngaba lo ngoyena msayini we-PDF wasimahla?

Ewe — kwiflow zomsebenzi ezikumgangatho wemfihlo nokufikelela kwizimemo ze-cryptographic kwinqanaba lwamahhala, sicinga kunjalo. Kumsebenzi we-workflow wamahlelo amaninzi (thumela kumtyikityi abahlanu, landelela isimilo), i-DocuSign okanye i-Adobe Sign yizixhobo ezifanelekileyo — uhlobo olukahlukeneyo.

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: 2026-07-15