ATick for Python#

Sign PDFs with confidence

ATick is the standalone PDF digital-signature library for Python — PAdES & CMS signing, USB tokens, the Windows store and Indian eSign, with zero dependencies.

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API reference

import atick

signed = atick.sign_pfx(
    open("doc.pdf", "rb").read(),
    pfx=open("my.pfx", "rb").read(), password="••••",
    style=atick.Style(cn="Aniket Chaturvedi", reason="Approved"),
    placements=[(1, (300, 55, 575, 175))],
    pades=True, timestamp=True, ltv=True,     # PAdES-B-LT
)
open("signed.pdf", "wb").write(signed)

Everything you need to sign PDFs#

Sign anywhere

PFX/P12 or PEM files, USB tokens / smart-cards / HSMs (PKCS#11), and the Windows certificate store — one consistent API.

Signing methods »

Full PAdES

B-B, B-T, B-LT, B-LTA with RFC-3161 timestamps and long-term validation — recognised by Adobe Acrobat as “PAdES Signature Level”.

PAdES levels »

Indian eSign

The complete CCA eSign flow (every API version) — prepare, sign the request, embed the ESP reply (rawrsa / PKCS7 / pkcs7Pdf / pkcs7complete).

eSign guide »

Rich appearance

Logo or CN-on-the-left, the validity mark (? / green tick), distinguished name, custom text, invisible signatures, any date format.

Appearance »

Trust & control

Certification (DocMDP), field-locking (FieldMDP), pre-sign expiry / CRL / OCSP checks, password protection and metadata.

Certification »

Built for scale

A revocation cache makes batch signing ~6× faster, multi-signatory documents stay valid, and every error is a clean Python exception.

Fast signing »

The green tick your readers trust#

ATick draws a verified-signature appearance with a green tick. When the certificate is valid and trusted, Adobe Reader / Acrobat shows “Signed and all signatures are valid.” — the reassurance every signed document needs.

Adobe Reader — signed and all signatures are valid, with the ATick green tick

Why ATick#

	ATick
Dependencies	none — the crypto, PKCS#12/PEM, PKCS#11, image decode, timestamping and LTV are all built in
Install	`pip install atick` — one self-contained package
Interfaces	a Python API and a full `atick` command-line tool
Platforms	Windows, Linux and macOS (the Windows-store picker is Windows-only)
Errors	every failure is a Python `atick.AtickError` you can catch