Attest vs Adobe Acrobat Sign

Attest and Adobe Acrobat Sign at a glance

Adobe Acrobat Sign is Adobe's broad e-signature platform. It is included in the Acrobat Standard, Pro and Studio plans, and sold on its own, through Adobe's sales team, as Acrobat Sign Solutions. It offers a wide choice of signer checks, and certified PDFs that Acrobat Reader shows with a blue banner. Attest is built around a different promise: proof anyone can check, on documents only the parties can read. Adobe's details below are from its own pages, read on October 11, 2026; help-center pages are cited through the dated Internet Archive copies listed in the sources.

	Attest	Adobe Acrobat Sign (as published October 11, 2026)
Who can read your documents	Only you and the people you send them to. Every document is end-to-end encrypted in your browser	Adobe: stored data "is encrypted at rest using AES 256-bit encryption", and its document processing service handles "encrypting and decrypting files"
How a signer signs	Approves with a passkey only they control (Face ID, Touch ID, Windows Hello or the device PIN), with no account or password	Opens the agreement from the email, with no account by default. Phone, knowledge-based and government ID checks are metered "premium" methods
What ties the signature to the document	Each signer's own cryptographic signature over the document's fingerprint and their entries	Adobe's certification of the final PDF with a digital signature from its own certificate (PKI): Adobe's, not the signer's
Checking a signed document	Anyone, free, with no account. The open-source verifier is inside every signed copy and checks it against a public blockchain	Acrobat and Acrobat Reader show Adobe's certification as a blue banner
When you stop paying	The signed copy still verifies on its own, even if Attest is gone	After a license ends, Adobe "is under no obligation to retain" agreements, audit reports or other customer data
Prove a fact without the document	Yes: share a zero-knowledge proof that you signed, and the date it was completed	Not offered
Entry price	$5 a month for 20 documents	Acrobat Standard: $24.99 a month, or $14.99 a month on an annual plan billed monthly

Privacy: who can read your contracts

Adobe's Acrobat Sign Security Overview (June 2026) describes two layers: data in transit is encrypted with TLS 1.2 or greater, and stored data with AES 256-bit encryption. It also describes a document processing component that converts files to PDF, encrypts and decrypts them, and renders them for viewing in a browser. So Adobe's service can decrypt your documents, as most e-signature services can.

Attest encrypts every document in your browser before upload, with AES-256-GCM, and locks the key that opens it separately for each person you send it to. Attest stores your document only as ciphertext it can't read, and it is decrypted only in the parties' own browsers. What Attest does see is the information around the document, such as its title and file name, your note, the signers' names and email addresses, and when each step happened.

We compared 21 e-signature services in October 2026, Attest and 20 others, and Attest was the only one that end-to-end encrypts every document, for every signer, by default. It also means Attest can't train AI on your documents: it never has them in readable form.

How people sign

On Acrobat Sign, a signer opens the agreement from the email's Review and sign button, with no account by default. The sender can add checks such as a signing password, a one-time code by email or phone, WhatsApp authentication, knowledge-based questions (for US recipients only) or a government ID with a selfie. Adobe lists phone, knowledge-based, government ID and cloud-based digital signature checks as "premium" methods, "a metered resource that must be purchased prior to use".

On Attest, the signature itself is the signer's own. A signer opens their link and approves with their passkey: a cryptographic key only the signer controls, unlocked with Face ID, Touch ID, Windows Hello or the device PIN. The passkey signs a statement that names the exact document, by its fingerprint, and everything the signer entered, so each signature is tied to that signer and that document. Signers need no account and no password, and they never pay.

Proof that doesn't depend on the vendor

Adobe certifies each final signed PDF and its audit report with a digital signature from its own certificate. Because that certification is compliant with the Adobe Approved Trust List (AATL) program, Acrobat and Acrobat Reader show a blue banner when the file is opened. The audit report records the events, IP addresses or geolocations and the authentication used. After a license ends, Adobe's help center says Adobe "is under no obligation to retain" the customer's agreements, audit reports or other data.

An Attest signed copy carries its own proof, and that proof rests on cryptography and a public blockchain, not on a certificate authority, Adobe's or anyone else's. Every party receives the same sealed PDF: the signed pages, with a "Signed with Attest" stamp on each signature and a seal line at the foot of every page, a certificate of completion, the audit trail up to completion and a "Verify it yourself, without us" page, plus three files attached inside: the original document, the evidence and a standalone open-source verifier. Every completed agreement is anchored on the Horizen public blockchain.

To check it, open the verifier in any browser and drop the PDF on it: no account, no Adobe software, and no Attest service needed. Running in your browser, it checks the original document inside the signed copy against what every signer signed, each signer's passkey signature and entries, Attest's anchored record of the agreement on Horizen, and that nothing was added to the PDF after it was sealed. It also re-makes every page you see from what was signed and compares the result with the copy byte for byte, so pages drawn with anything else fail. Its trust root is pinned: the chain, Attest's registry and the keys it checks against are built into the verifier, never read from the file being checked, and it accepts only anchors from Attest's registered wallets.

Attest put this to the test on a real agreement: with Attest blocked, the verifier inside its signed copy still confirmed it, reading only a public blockchain node, and changing the pages made it fail. The film is on the signing page. For the steps, see how to verify a signed PDF without Adobe.

Proving an agreement without sharing it

When someone has a reason to know that an agreement exists but no reason to read it, such as a lender checking a contract or an investor confirming a deal, Attest's Share proof answers just that. It creates a zero-knowledge proof that you, or you and a named co-signer, signed an agreement completed on a given date. The recipient sees the email addresses involved, the completion date, and that the proof is valid and where its record is anchored, and nothing of the document, its title or its terms. Each proof is verified on zkVerify, and anyone can check it free. Adobe Acrobat Sign does not offer this.

Price at small volume

What you send	Attest	Adobe Acrobat Sign (as published October 11, 2026)
Up to 20 documents a month	$5 a month	Acrobat Standard: $24.99 a month, $14.99 a month on an annual plan billed monthly, or $179.88 a year prepaid
Per document, at 20 a month	25 cents	About 75 cents on Acrobat Standard's annual plan
Cancelling	Cancel any time	Monthly plan: cancel anytime, no fee. Annual plan billed monthly: a fee of up to half the remaining annual commitment after 14 days. Prepaid: no refund after 14 days

Acrobat Pro, Adobe's next individual plan, is $29.99 a month, or $19.99 a month on an annual plan, as published on October 11, 2026. On Attest, the people who sign never pay, on any plan.

Who should choose Attest

• Teams that edit PDFs in Acrobat: keep editing there, and send the finished PDF for signature with Attest.
• Businesses that send confidential contracts, such as offer letters, pricing agreements and NDAs, where the terms should stay between the parties: every Attest document is end-to-end encrypted in the browser.
• Anyone who wants proof that needs no particular reader: the signed copy checks itself in any browser.
• Recipients of a signed document who want to check it independently, for free.

Switching from Adobe Acrobat Sign

No migration is needed: start with your next PDF. Sign in to Attest with your email and set up your signing key with a passkey and a recovery phrase. Upload the PDF you would have sent with Acrobat Sign (up to 8 MB), add your signers and place their fields: signature, initials, date signed, full name or text. Your first 2 documents are free, in total, so you can try it on a real agreement before you pay anything.