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.

Ami PDF - Ọfẹ, Ikọkọ, Cryptographic

Awọn ibuwọlu ti o han ATI awọn ibuwọlu oni nọmba cryptographic gidi (PKCS#7) - mejeeji ọfẹ, mejeeji agbegbe, mejeeji ti mọ ni ofin

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% Ọ̀fẹ́ Láìlái Kò Nílò Àkọọ́lẹ̀ 100% Lori Ẹrọ Rẹ Ologun-ite ìsekóòdù

Awọn faili ko fi ẹrọ rẹ silẹ

AES-256 ìsekóòdù

A ko le ri awọn iwe aṣẹ rẹ

Ko si asopọ ti o nilo

Ju PDF rẹ silẹ nibi

tabi

PDF · Ko si ikojọpọ — Ibuwọlu & bọtini ikọkọ duro lori ẹrọ rẹ.

Bii o ṣe le forukọsilẹ PDF fun Ọfẹ

1. Ju PDF rẹ silẹ

Fa PDF sori agbegbe ju loke, tabi tẹ lati lọ kiri lori ayelujara. Olootu ṣii laifọwọyi pẹlu ijẹrisi ijẹrisi ti a ti yan tẹlẹ - ko si lilọ kiri nipasẹ awọn akojọ aṣayan, ko si wiwa fun irinṣẹ iforukọsilẹ.

2. Fa, tẹ, tabi po si rẹ Ibuwọlu

Ilana ijẹrisi nfunni ni awọn ọna mẹta si ibuwọlu ti o han: fa pẹlu asin rẹ, paadi orin, tabi ika lori iboju ifọwọkan; tẹ orukọ rẹ sinu fonti Ibuwọlu gidi; tabi gbejade PNG / JPG ti ibuwọlu rẹ ti o wa tẹlẹ. Gbogbo awọn mẹtẹẹta gbejade abajade ti o han kanna - yan eyikeyi ti o jẹ adayeba julọ fun ọ.

3. Fi idi kun, ipo, ati ọjọ

Fun PDF 2.0 spec, awọn ibuwọlu cryptographic gbe idi iyan (fun apẹẹrẹ “Emi ni onkọwe”), ipo (fun apẹẹrẹ “Berlin, Germany”), ati awọn aaye ọjọ. Awọn oludaniloju wo iwọnyi lẹgbẹẹ ipo crypto. A auto-kun ọjọ; kún ìyókù bí àyíká ọ̀rọ̀ bá béèrè fún un.

4. Gbe ibuwọlu ati ami

Tẹ ibikibi lori oju-iwe naa lati ju igun onigun ibuwọlu ti o han silẹ. Fa lati tun iwọn. Tẹ Fipamọ. A ṣe ipilẹṣẹ bọtini RSA-2048 tuntun + ijẹrisi ti ara ẹni ninu ẹrọ aṣawakiri rẹ, ṣe iṣiro SHA-256 hash ti iwọn baiti iwe, ṣajọ blob data ti PKCS#7 ti o fowo si, ki o si fi sabe sinu PDF. Faili ti o fowo si ṣe igbasilẹ lẹsẹkẹsẹ.

Kini idi ti Eyi jẹ Ami Ami PDF Ọfẹ ti o dara julọ

100% agbegbe - ko si ilowosi olupin

PDF rẹ, ibuwọlu iyaworan rẹ, ijẹrisi ti o gbejade, bọtini ikọkọ rẹ - ko si ọkan ninu rẹ ti o kan olupin kan. Ṣe afiwe: Adobe, Smallpdf, iLovePDF, DocuSign, ati Sejda gbogbo wọn gbejade ohun gbogbo. Nigbati iwe naa ba jẹ adehun ti o fowo si, NDA, ipadabọ owo-ori, tabi itusilẹ iṣoogun, iyẹn ṣe pataki ju ibikibi miiran lọ lori oju opo wẹẹbu.

Real cryptography, free ipele

Smallpdf ati iLovePDF fun ọ ni ibuwọlu ti o han lori awọn ipele ọfẹ wọn - akọwe kan lori oju-iwe laisi ẹri cryptographic. Iyẹn jẹ “ibuwọlu itanna”, alailagbara labẹ ofin. A fun ọ ni awọn ibuwọlu oni nọmba PKCS # 7 / CMS ọfẹ, boṣewa kanna Adobe Acrobat Pro nlo (ti o wa lẹhin ṣiṣe alabapin $ 15 / mo nibẹ).

Lẹsẹkẹsẹ awọn iwe-ẹri ti o fowo si ara ẹni

Pupọ awọn ṣiṣan ibuwọlu cryptographic beere ijẹrisi ti a ti fun ni iṣaaju. A ṣe ipilẹṣẹ oriṣi bọtini RSA-2048 tuntun ati iwe-ẹri X.509 ti ara ẹni ti o fowo si ninu ẹrọ aṣawakiri rẹ nipasẹ API Crypto Wẹẹbu — iṣeto odo. Po si rẹ tẹlẹ .p12 / .pfx ti o ba ti o ba fẹ ẹni-kẹta igbekele; bibẹẹkọ iwe-ẹri ti ara ẹni ti o to fun lilo ti ara ẹni ati awọn iṣan-iṣẹ iṣowo-kekere.

Han + cryptographic lori ọkan kọja

Pupọ julọ awọn irinṣẹ ọfẹ fi agbara mu ọ lati yan ọkan. A ṣe akopọ wọn: Ibuwọlu iyaworan rẹ ti o han n gbe lori oju-iwe ATI PDF gbe ibuwọlu cryptographic kan ti o jẹrisi ẹniti o fowo si ati pe iwe naa ko ti yipada. Mejeeji ni igbasilẹ igbasilẹ kan ṣoṣo.

Ijerisi aifọwọyi lori fifuye

Ju PDF ti o fowo si ati pe a ṣafihan asia ijẹrisi kan - wulo / aiṣedeede / olufunni ti ko ni igbẹkẹle - lẹgbẹẹ awọn alaye ijẹrisi ibuwọlu naa. Awọn oludije maa n ṣafihan aworan ibuwọlu nikan; o ni lati mu lori igbagbọ.

Awọn ẹwọn ibuwọlu pupọ

Wole, firanṣẹ si ẹlẹgbẹ, wọn fowo si ati firanṣẹ pada. Awoṣe iwọn baiti PDF ṣe atilẹyin nọmba eyikeyi ti awọn ibuwọlu lẹsẹsẹ; Ibuwọlu tuntun kọọkan ni wiwa awọn ti o ṣaju, ti n ṣafihan pq ti o daju. Olootu wa mu tun-buwọlu lai ṣe aifọwọsi ibuwọlu iṣaaju.

Ominira nitootọ, Titilae

Ko si idanwo, ko si ipele Ere, ko si idiyele ibuwọlu kọọkan. Adobe Acrobat Pro jẹ $ 15 / mo; DocuSign Ti ara ẹni jẹ $ 15 / mo; Smallpdf Pro jẹ $12 fun oṣu kan. Gbogbo wọn boya po si faili rẹ tabi beere ṣiṣe alabapin kan fun wíwọlé cryptographic. A ṣe atilẹyin ipolowo ati ọfẹ lailai.

Ko si iroyin, ko si imeeli

Bẹrẹ wíwọlé lẹsẹkẹsẹ. Ko si iforukọsilẹ, ko si gbigba imeeli, ko si kaadi kirẹditi.

Ṣiṣẹ offline

Ni kete ti olootu ba ti kojọpọ o le ge asopọ lati intanẹẹti ki o tẹsiwaju fowo si. Nla fun awọn adehun ifura, NDA, ati awọn iwe aṣẹ inawo ti ara ẹni.

Awọn Ibuwọlu Itanna vs. Awọn Ibuwọlu oni-nọmba - Kini Nitootọ Dimu Up

Ibuwọlu itanna (SES - Rọrun)

Eyikeyi ami ti o han lori iwe oni-nọmba kan: orukọ ti a tẹ, iwe-kikọ iyaworan, ibuwọlu inki tutu ti a ṣayẹwo, apoti “Mo gba”. Ti idanimọ labẹ ofin ni ọpọlọpọ awọn sakani fun iṣowo lojoojumọ (EU eIDAS SES tier, US ESIGN / UETA, Ofin Ibaraẹnisọrọ Itanna UK) ṣugbọn o rọrun lati dije ti o ba jẹwọ ti o ba sẹ pe fowo si - ko si ẹri cryptographic ti ẹniti o ṣe ami naa. Ipo “han nikan” wa ṣe agbejade eyi.

Ibuwọlu itanna to ti ni ilọsiwaju (AES)

Ilana ilana EU eIDAS 2. Gbọdọ (a) ṣe idanimọ olufọwọsi ni iyasọtọ, (b) wa labẹ iṣakoso atẹlẹsẹ ti olufọwọsi, (c) ṣe iwari fifọwọkan fawabale lẹhin, (d) jẹ ki o ṣẹda nipa lilo data ti olufọwọsi le ṣetọju labẹ iṣakoso nikan wọn. Iṣẹjade cryptographic wa (PKCS#7 lori SHA-256 pẹlu RSA-2048 ati bọtini ikọkọ ti ipilẹṣẹ ni agbegbe ni ibi ipamọ Crypto wẹẹbu ti kii ṣe jade) ni ibamu pẹlu gbogbo awọn ibeere mẹrin - o le beere ipo AES fun PDF ti o fowo si ibi.

Ibuwọlu itanna to peye (QES)

Ilana ilana EU eIDAS 3. AES pẹlu ijẹrisi ti o peye lati ọdọ Olupese Iṣẹ Igbẹkẹle kan (TSP) lori atokọ igbẹkẹle EU kan, pẹlu ohun elo ẹda ibuwọlu ti o peye (HSM tabi smartcard). QES jẹ deede ti ofin si ibuwọlu inki tutu ni gbogbo EU. A ko ṣe agbejade QES nitori awọn ṣiṣan aṣawakiri-nikan ko le pade ibeere ohun elo ẹda ti o da lori ohun elo - o nilo ẹrọ iforukosile iyasọtọ tabi HSM awọsanma. Ti ọran lilo rẹ ba nilo QES ni pataki (awọn iwe adehun ti a ṣe akiyesi, diẹ ninu awọn ile-iṣẹ ilana), o nilo Ami Adobe, DocuSign EU Qualified, tabi TSP agbegbe kan.

Ofin AMẸRIKA (ESIGN / UETA)

Ofin ESIGN Federal ti AMẸRIKA (2000) ati isọdọmọ UETA ti ipinlẹ ṣe itọju awọn ibuwọlu itanna pupọ julọ bi ofin si deede si inki tutu - laisi ero ti EU. Fun ibuwọlu kan lati fi agbara mu: (a) awọn mejeeji gbọdọ gba lati fowo si ni itanna, (b) Ibuwọlu gbọdọ jẹ imomose, (c) awọn igbasilẹ gbọdọ jẹ idaduro. Gbogbo awọn wọnyi ni o wa operational; iṣẹjade wa pade wọn. Diẹ ninu awọn oriṣi iwe kan pato ni a gbe jade (awọn ifẹnukonu, awọn ọran ofin-ẹbi, diẹ ninu awọn ifilọlẹ ile-ẹjọ) - ṣayẹwo ipinlẹ rẹ.

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

Ẹ̀ya-ara	PDF Ṣatunkọ	Adobe	Smallpdf	iLovePDF	DocuSign	Sejda
Àwọn fáìlì ni a gbé sí ẹ̀rọ-ìṣẹ́?	No — 100% local	Bẹẹni	Bẹẹni	Bẹẹni	Bẹẹni	Bẹẹni
Awọn ibuwọlu cryptographic lori ipele ọfẹ?	Yes — PKCS#7 / CMS	Ti san ($15 fun oṣu kan)	Ti san ($12 fun oṣu kan)	Sanwo	Ti san ($15 fun oṣu kan)	Sanwo
Awọn ibuwọlu ti o han ni ọfẹ?	Yes	Bẹẹni	2 / ọjọ ọfẹ	Ipele ọfẹ lopin	Sanwo	Ipele ọfẹ lopin
Iwe-ẹri ti o fowo si funrararẹ?	Yes — auto	Nbeere agbewọle	Rara	Rara	Rara	Rara
Ṣe igbasilẹ .p12 / .pfx tirẹ?	Yes	Bẹẹni (sanwo)	Rara	Rara	Bẹẹni (sanwo)	Rara
Àkọọ́lẹ̀ wulẹ̀?	Never	Ipele ọfẹ lopin	Imeeli beere	Ipele ọfẹ lopin	Imeeli beere	Ipele ọfẹ lopin
Àmì omi lórí ìjáde?	No	Rara	Rara	Rara	Rara	Rara
Ó ń ṣiṣẹ́ láìsí ìtakùn lẹ́yìn ìfisílẹ̀?	Yes	Rara	Rara	Rara	Rara	Rara
Ṣe idaniloju awọn ibuwọlu ti nwọle?	Yes — auto banner	Bẹẹni	Apa kan	Apa kan	Bẹẹni	Apa kan
Iye owo ọdọọdun fun iforukọsilẹ 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.

Tani Ṣe Ami PDFs Bii Eyi?

Freelancers wíwọlé siwe

Oníbara fi rúgbìn tàbí amúpamọ́ ránṣẹ́. O wole, crypto-stamp, firanṣẹ pada. Ko si ikojọpọ si DocuSign, ko si awọn imeeli “idanwo ọfẹ”, ko si ṣiṣe alabapin Adobe - ati pe ibuwọlu naa lagbara labẹ ofin ju iwe-kikọ JPG nitori pe o ṣe atilẹyin nipasẹ PKCS#7 crypto.

HR ati awọn fọọmu oojọ

Pese awọn lẹta, awọn NDA, awọn apo-iwe lori wiwọ, W-9s, awọn fọọmu idaduro owo-ori. Ni imọlara to pe ikojọpọ si aaye iforukọsilẹ ọfẹ laileto ko yẹ. Wole ni agbegbe, firanṣẹ pada nipasẹ imeeli.

Awọn idasilẹ iṣoogun ati awọn fọọmu HIPAA

Awọn aṣẹ ti o forukọsilẹ fun awọn igbasilẹ iṣoogun, awọn iṣeduro iṣeduro, tabi awọn fọọmu idasilẹ idanwo. Akoonu ti o ni aabo HIPAA ko yẹ ki o gbejade si olupin alejo kan. Awọn ọrọ ibuwọlu agbegbe nikan.

Ifiweranṣẹ ofin

Awọn lẹta ifaramọ, awọn adehun ipinnu, awọn ikede, awọn alaye bura. Nibo ni anfani ti o somọ, iwe ko yẹ ki o fi ẹrọ rẹ silẹ lakoko iforukọsilẹ. Sisan agbegbe wa ṣe itọju iyẹn.

Ohun-ini gidi ati awọn adehun yiyalo

Awọn adehun iyalo, awọn atunṣe iyalo, awọn ifihan ohun-ini. Wole ati pada laisi iforukọsilẹ fun iru ẹrọ ibuwọlu miiran. Awọn ẹlẹgbẹ gba ami-ẹri cryptographically-fidi PDF wọn le ṣii ni eyikeyi oluwo.

Ijoba ati ori fọọmu

Awọn fọọmu IRS (W-9, 1099), awọn ohun elo ijọba, awọn iwe aṣẹ iṣiwa. Ọpọlọpọ awọn ile-iṣẹ gba PKCS # 7 fowo si PDFs. Ibuwọlu agbegbe yago fun ikojọpọ awọn iwe idanimọ ifura.

Awọn onkọwe ati awọn oniwun ẹtọ

Wole iṣẹ oni-nọmba kan lati jẹrisi onkọwe ni aaye kan pato ni akoko. Ibuwọlu PKCS#7 + timestamp ninu PDF ti o fowo si jẹ igbasilẹ ti o tọ, ti a ṣe nipasẹ bọtini ikọkọ rẹ.

Awọn ipinnu igbimọ ile-iṣẹ

Awọn iṣẹju igbimọ, awọn ipinnu ifọkansi, awọn ifunni aṣayan-ọja. Atilẹyin pq ami-pupọ jẹ ki awọn oludari fowo si lẹsẹsẹ laisi dari PDF nipasẹ awọsanma ẹni-kẹta.

Apamọwọ iwe igba pipẹ

Wole PDF pataki kan loni pẹlu ibuwọlu cryptographic ti ontẹ ọjọ kan. Itaja tibile. Awọn ọdun nigbamii, ẹnikẹni ti o ni faili naa tun le rii daju pe o ti fowo si nipasẹ ẹniti o di bọtini ikọkọ rẹ ati pe ko ti yipada lati igba naa. (Fun awọn ṣiṣan iṣẹ-ifọwọsi igba pipẹ ni deede pẹlu awọn ami igba igbẹkẹle, wo apakan FAQ lori LTV.)

Wole PDF sori iPhone, Android, Mac, Windows, ati Chromebook

Ami PDF wa nṣiṣẹ lori gbogbo ẹrọ pẹlu ẹrọ aṣawakiri ode oni - Windows, Mac, Linux, Chromebook, iPad, iPhone, ati Android. Lori iPad Pro pẹlu Apple Pencil, iyaworan ibuwọlu rẹ kan lara ni deede bi ohun elo alagbeka DocuSign, iyokuro ṣiṣe alabapin ati iyokuro ikojọpọ naa. Ko si ohun elo fifi sori ẹrọ, ko si awọn afikun, ko si awọn ẹtọ abojuto. Ni kete ti oju-iwe naa ba ti ṣajọpọ o le ge asopọ lati intanẹẹti ki o tẹsiwaju iforukọsilẹ - ohun gbogbo n ṣiṣẹ ni agbegbe nipasẹ API Crypto Wẹẹbu.

Bawo ni Ṣiṣe-orisun Cryptographic PDF Ṣiṣe Ibuwọlu Aṣàwákiri Ṣe?

Nigbati o ba tẹ Fipamọ, a ṣe ipilẹṣẹ oriṣi bọtini RSA-2048 tuntun ninu ẹrọ aṣawakiri rẹ nipa lilo API Crypto Wẹẹbu (crypto.subtle.generateKey) — bọtini ikọkọ n gbe ni ibi ipamọ ti kii ṣe jade ati pe ko le ṣe okeere. A kọ X.509 ijẹrisi ti ara ẹni pẹlu orukọ ibuwọlu ti o yan. A ti pese PDF pẹlu ṣofo /Sig ibi ipamọ inu aaye /AcroForm kan. A ṣe iṣiro hash SHA-256 ti iwọn baiti ti iwe-ipamọ laisi ibi ipamọ. Hash naa ti fowo si pẹlu bọtini ikọkọ rẹ nipasẹ crypto.subtle.sign (RSA-PKCS1-v1_5 pẹlu SHA-256). A kọ PKCS # 7 / CMS SignedData be ti o ni ibuwọlu, ijẹrisi rẹ, akoko iforukọsilẹ, ati eyikeyi idi/metadata ipo. PKCS # 7 blob jẹ koodu DER ati ifibọ sinu aaye PDF's / Sig. Awọn igbasilẹ faili. Gbogbo oluwo PDF ode oni (Adobe, Chrome, Edge, Foxit, Awotẹlẹ, Firefox) ka ilana PKCS#7 lori ṣiṣi, ṣe iṣiro hash iwe, ṣe idaniloju ibuwọlu lodi si ijẹrisi ifibọ, ati ṣafihan baaji ijẹrisi kan. Gbogbo crypto nṣiṣẹ ninu ẹrọ aṣawakiri rẹ - ko si olupin, ko si ikojọpọ, ko si telemetry.

Awọn ibeere Nigbagbogbo

Bawo ni MO ṣe forukọsilẹ PDF fun ọfẹ?

Ju PDF rẹ silẹ si oju-iwe loke. Olootu ṣi pẹlu Ilana ijẹrisi ti a ti yan tẹlẹ. Fa, tẹ, tabi po si Ibuwọlu rẹ. Tẹ oju-iwe naa lati gbe. Tẹ Fipamọ. Ọfẹ, agbegbe, ko si ami omi.

Bawo ni MO ṣe le ṣafikun ibuwọlu si PDF kan?

Sisan kanna - ju silẹ, fa, gbe, fipamọ. "Wọle" ati "ṣe afikun ibuwọlu" ṣe abajade kanna ni ọpa wa.

Ṣe awọn ibuwọlu wọnyi ni ibamu labẹ ofin bi?

Bẹ́ẹ̀ ni ní ọ̀pọ̀lọpọ̀ àgbègbè ìṣẹ́-òfin. Ìwé-ẹrí ìṣirò wa pade àwọn ìtọ́kasí EU eIDAS "Ìbuwọ́lù Ìlàsorí Alárọ̀kẹyìn" àti ní ìtẹlọrùn fún àwọn ìbéèrè US ESIGN / UETA. Fún àwọn ìwé tó fọwọ́ notary àti àwọn ìṣẹ́-àṣà QES pàtó, o nílò ẹ̀rí TSP tí a kò lè ṣẹ̀dá nínú aṣàwákiri — lo Adobe Sign tàbí TSP àgbègbè.

Ṣe PDF mi ti gbejade?

Rara. Iforukọsilẹ ṣẹlẹ patapata ni ẹrọ aṣawakiri rẹ. PDF rẹ, ibuwọlu, ati bọtini ikọkọ ko kan awọn olupin wa.

Kini iyatọ laarin itanna ati awọn ibuwọlu oni-nọmba?

Itanna = eyikeyi aami ti o han (scribble, orukọ ti a tẹ, aworan). Digital = iṣẹ-ṣiṣe cryptographic ti o jẹrisi idanimọ + iduroṣinṣin. A ṣe awọn mejeeji, tolera lori iwe-iwọle Ibuwọlu kan. Pupọ julọ awọn oludije ọfẹ nikan ṣe itanna.

Kini PKCS # 7?

Ifaminsi boṣewa fun data ibuwọlu ni PDFs. Gbogbo oniwo PDF ode oni ka PKCS # 7 / CMS ni abinibi. Ijade wa jẹ ifaramọ pato - ọna kika kanna Adobe Acrobat Pro nlo.

Njẹ PDF ti a fọwọsi yoo ṣiṣẹ ni Adobe?

Bẹẹni. Adobe Acrobat Reader / Pro, Chrome, Edge, Firefox, Foxit, macOS Awotẹlẹ - gbogbo wọn jẹrisi awọn ibuwọlu wa. Awọn iwe-ẹri ti o fowo si ara ẹni fihan ikilọ “aimọ ami-ami” (iwa to pe); po si a .p12 lati kan ti o gbẹkẹle CA fun ijẹrisi-baaji alawọ ewe.

Ṣe Mo le gbejade iwe-ẹri mi ti o wa tẹlẹ?

Bẹẹni. Ninu ilana ijẹrisi mu "Lo ijẹrisi ti o wa tẹlẹ" ati gbejade faili .p12 tabi .pfx rẹ (pẹlu ọrọ igbaniwọle ti eyikeyi). Iwe-ẹri naa jẹ itupalẹ ni agbegbe - ko tan kaakiri.

Njẹ ọpọ eniyan le fowo si PDF kanna?

Bẹẹni, lẹsẹsẹ. Wole ati download. Olugba ṣi i nibi ati ami lẹẹkansi. Ibuwọlu kọọkan ni wiwa awọn iṣaaju - pq ti o daju.

Ṣe MO le fowo si PDF lori foonu mi?

Bẹẹni. Ṣiṣẹ lori iPhone Safari, iPad (paapaa pẹlu Apple Pencil — kan lara bi DocuSign Mobile), Android Chrome. Ya pẹlu ika rẹ.

Ṣe MO le fowo si ọrọ igbaniwọle to ni aabo PDF?

Bẹ́ẹ̀ ni tí ó ba di mọ́ nípasẹ̀ oní-rẹ, rárá tí ó bá di mọ́ nípasẹ̀ olùmúlò. Tí ó bá di mọ́ nípasẹ̀ oní-rẹ, ìbuwọ́lù ń ṣiṣẹ́ tààrà. Tí ó bá di mọ́ nípasẹ̀ olùmúlò (nílò ọ̀rọ̀ àṣírí fún ṣíwọ́), tu sílẹ̀ nipasẹ̀ /unlock-pdf ní àkọ́kọ́. Àwọn ẹrọ méjèjì ṣiṣẹ́ lọ́kọ̀ọ̀kan.

Ṣe o ṣiṣẹ offline?

Bẹẹni, ni kete ti olootu ti kojọpọ. Enjini fawabale nṣiṣẹ ninu ẹrọ aṣawakiri rẹ.

Kini nipa awọn ibuwọlu igba akoko (RFC 3161)?

Ko ṣe atilẹyin sibẹsibẹ - awọn akoko akoko nilo ipe nẹtiwọọki kan si TSA ita ti o ṣẹ ileri agbegbe-nikan. Fun ifọwọsi igba pipẹ (LTV) ṣiṣan iṣẹ, lo Adobe Acrobat Pro tabi iṣẹ iforukọsilẹ iṣowo.

Njẹ oludaniloju yoo rii ijẹrisi ti ara ẹni ti o fowo si bi wulo?

Rárá — wọn yóò rí ìkìlọ̀ "ẹni tó fi ìdámọ̀ sí kò mọ̀" nítorí àwọn ẹ̀rí tí ara rẹ fọwọ́ sí kò wà ní aṣẹ nínú ẹwọn CA ìpilẹ̀ tí a gbáralé. Ìbuwọ́lù fúnra rẹ̀ N wúlò nínú ìṣirò — ó jẹ́ ìfẹnukò ìdámọ̀ tó nílò ìgbẹ́kẹ̀lé àdájọ́-kẹta. Fún ìlò ara ẹni, ó tó; fún ìlò ọfin/òwò, gbé fáìlì .p12 kan láti CA tó ní ìgbẹ́kẹ̀lé.

Njẹ olugba le ṣatunkọ PDF ti a fowo si bi?

Rárá — tí wọn bá ṣe àtúnṣe rẹ, ìbuwọ́lù ìṣirò fọ́ àti olùmójútó èyíkéyìí rí "ìbuwọ́lù kò wúlò, ìwé àtúnṣe lẹ́yìn ìbuwọ́lù". Èyí jẹ́ gangan ohun-ìní ìdáwọ́le-ìbàjẹ́ tó mú àwọn ìbuwọ́lù àgbàyanu ní ìmọ̀-ọ̀fọ̀ ofin.

Ṣe ibuwọlu mi yoo ni aami omi kan?

Rara. PDF rẹ ti o fowo si ni awọn ibuwọlu rẹ gangan - ko si awọn ontẹ “Ṣiṣe pẹlu FreeTool”, ko si ipolowo, ko si upsell. Ohun ti o fowo si ni ohun ti n firanṣẹ.

Ṣe opin-iwọn faili kan wa?

Ko si aropin atọwọda. Iranti ẹrọ jẹ aja nikan.

Ṣe eyi jẹ ami ami PDF ọfẹ ti o dara julọ bi?

Bẹ́ẹ̀ ni — fún àwọn ìṣẹ́-àṣà tó kọ́kọ́ sí ìpamọ́ àti fún gbígba àwọn ìbuwọ́lù ìṣirò lórí ipele ọ̀fẹ́, a rò bẹ́ẹ̀. Fún ìṣètò ìṣẹ́-àṣà ọ̀pọ̀-àdúgbò (fi ránṣẹ́ sí àwọn olùfọwọ́sí 5, tọ̀ ọ́ sí ipò), DocuSign àtàbí Adobe Sign ni àwọn ẹrọ tó tọ́ — ìjọba mìíràn.

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