Pricing
Capabilities that are rare in one browser PDF tool: your PDF never leaves the browser, quantum-resistant signatures, and remote notary attestation — a different posture from DocuSign, Adobe, or Smallpdf.
Free tier always available. Two paid tiers (Pro + Max), billed monthly or annually. No seats, no contract calls, cancel anytime.
Free
forever
- 15 signed PDFs per month
- Fill, sign, and redact
- Unlimited on-device auto-fill + 25 Claude AI actions/mo
- ‘Signed via AttachKit’ footer
- Saved profile for one-click autofill
- 3 reusable form templates
- Encrypted drafts to resume later
Pro
Most popular$10/month — 2 months free
- Unlimited signed PDFs
- No footer on your signed PDFs
- Bulk send (up to 50 recipients)
- Bulk-fill forms from a CSVDrop a spreadsheet, get one filled PDF per row in a ZIP — still 100% in your browser, nothing uploaded.
- Real-time co-signSign a PDF together over a direct connection — the file never touches our server.
- Phone handoff for touch signing
- Encrypted drafts across all tools
- Unlimited reusable form templates
- 200 Claude AI actions/mo — auto-fill, redact, clause review & drafting
Max
$15.83/month — 2 months free
- Everything in Pro
- 500 Claude AI actions/mo — auto-fill, redact, clause review & drafting
- Quantum-resistant signaturesPasskey-backed and timestamped — future-proofed against quantum attacks. Rare among consumer PDF tools.
- Remote notary attestationA notary records a passkey-bound attestation in a dual-passkey ceremony — a cryptographic record, not a substitute for your jurisdiction’s rules. Mobile notaries keep their fee; no separate Notarize subscription.
- Privileged AI (Counsel Mode)A cryptographic attestation that no third-party AI ever saw your document; processing stays on your device.
- 20-year verifiable archivesSigned PDFs stay provable for decades, even offline, with a PAdES-aligned long-term manifest (strict PAdES-B-LTA / PDF/A on the roadmap).
- Embed verification anywherePaste a 4-line snippet on any site so recipients can confirm a PDF is genuine, offline, with no callback to us.
- Multi-party signingAdd witnesses, co-signers, and “any N of M must sign” approval rules.
- Send so only they can open itThe recipient is the only one who can decrypt — we never hold a readable copy.
- Tamper-evident historyEvery edit is cryptographically linked and attributable, so you can prove what changed and when.
- API accessSign, fill, and verify in bulk from your own scripts and tools.
Stripe payments. Cancel anytime. All prices in USD.
A different category, not a cheaper DocuSign
Incumbents host your document and ask you to trust their servers. AttachKit is built so trust isn’t required — and every signature is provable by anyone, forever, with no callback to us.
Filling, signing, and redaction all run in your browser. Your PDF isn’t uploaded, stored, or readable by anyone at AttachKit.
Signatures are passkey-backed (WebAuthn), timestamped, and tamper-evident — anyone can verify a document offline, with no account and no call home.
Quantum-resistant signatures and PAdES-aligned archives (strict PAdES-B-LTA on the roadmap) are built to stay verifiable for years — even if AttachKit is gone.