Flash Turbo Signerv4.2 · Windows Desktop
Features

Everything a signing desk needs — and nothing it doesn't.

Built as decoupled engines (security, token I/O, signing, appearance, placement, workflow, batch, classification, configuration, logging) so behaviour stays predictable and auditable instead of hiding inside one large script. Tiers are marked where a capability is not on the free edition.

Plug-and-play token detection

Recognises the token families used across Indian DSC issuance and loads the matching PKCS#11 driver automatically.

  • Watchdata ProxKey
  • Feitian ePass & Hypersecu
  • M-Token CryptoID
  • SafeNet eToken
  • InnaIT PKCS#11 (Precision)

Visual signature placement

What you drag is what gets stamped. Position with the mouse, snap to a preset corner, or search the page for text such as “Authorised Signatory”.

  • Any page — last page by default
  • Resize and reposition before signing
  • Text-anchor auto-placement PRO
  • Page-boundary checks

Six professional stamp styles

Match the look of your own letterhead instead of accepting one fixed box. Each style renders only the fields you enable.

  • Professional, Minimal, Standard
  • Adobe Classic, Text Only, Handwritten
  • Toggle name, organisation, date, reason, location
  • Style-specific fonts, colours and border

PIN safety by design

The PIN is handed straight to the token and held in memory for the session only. It is never written to a log line, never sent anywhere, and never stored in plain text.

  • Interactive entry by default
  • Log-redaction filter always active
  • Fernet-encrypted if you opt into cross-restart caching
  • Retry handling for a wrong PIN
  • No PIN in config or history files

Trusted timestamps (RFC 3161)

Switch on a TSA timestamp when a document needs provable “signed at” evidence beyond the local clock. Leave it off and signing stays fully offline.

  • RFC 3161 timestamp embedding
  • Graceful fallback if the TSA is unreachable
  • Only this step ever needs internet

Placement scripts & templates PRO

Save a placement as a reusable .signscript and reload it on the next document, or let a saved template be recognised by fingerprint and re-applied in one click whenever a matching file is opened.

  • Save and load placement scripts
  • Text-anchor placement (“Sign Here”)
  • 999 placements per document
  • No watermark

Batch signing ENTERPRISE

Point the SDPE batch engine at a folder of invoices, statements or certificates and sign the whole set in one run.

  • Multi-document batches from a file list
  • Parallel processing across tokens
  • Progress tracking with checkpoint recovery
  • CSV export of batch results

Smart document classification PRO

An optional classifier reads the document, identifies its type and proposes the matching template and signature slot, so a repetitive desk stops guessing.

  • Document-type detection
  • Template suggestions
  • Reusable signed templates

Built-in verification

Open a signed PDF and confirm it is intact — no upload and no external service. The Verify and Integrity tabs report the signer, certificate chain and timestamp, and flag any change made after signing.

  • Signature validity and coverage checks
  • Signer, certificate issuer and expiry
  • Tamper detection across the document
  • Copyable verification report
Automation

Also fully scriptable — the flash-signer CLI

Every release ships a command-line interface for automation, scheduled jobs and integration into existing document pipelines. It reports what it did with plain ASCII output, so redirected logs never break a run — and it is the same signing engine the GUI uses. 

# 1. Which tokens are plugged in?
flash-signer tokens

# 2. Which certificates can they sign with?
flash-signer certs

# 3. Sign a document (PIN is prompted securely — never passed on the command line)
flash-signer sign "invoice-2026-0417.pdf" \
    --token watchdata \
    --style professional \
    --reason "Approved for payment" \
    --location "Mumbai" \
    --output "invoice-2026-0417-signed.pdf"

# Signed: invoice-2026-0417-signed.pdf
#   Time:    2026-10-02T11:24:07+05:30
#   Elapsed: 3.4s

Styles: professional (default), minimal, standard, adobe_classic, text_only, handwritten. Token brands: watchdata, feitian, mtoken, safenet — or omit the flag and let auto-detection pick. Add --tsa to embed an RFC 3161 trusted timestamp.

What is not in 4.2: the honest limitation list — legacy SHA-1 documents, hot-folder watching, OS trust-store integration and QR/logo stamps — is kept in the FAQ rather than left out of it. Read it here.

What the stamps look like → All six styles rendered on a page, with the fields each one can show. Which tier unlocks what → FREE, PRO and ENTERPRISE side by side — templates, batch signing and watermark rules. Supported tokens → The five brands, their PKCS#11 libraries and Acrobat Reader verification.

Try the free edition on one document.

Install Flash Turbo Signer 4.2, sign one PDF with your own token, then check it in Adobe. No account, no email verification and no internet connection needed.

  • All six stamp styles on every tier
  • PIN never leaves the token driver
  • Windows 10 and 11
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