Install & activate
Use an approved Release360 download, verify the package, install it, then sign in if your plan or workspace requires identity-bound entitlements.
Official product documentation · DocuSphere360
DocuSphere360 PDF Studio — A KT Group Product
PDF Studio documentation, user manual & help.
Explore verified downloads, Desktop and Cloud workflows, PDF editing, recovery, technical guidance, and the source-level API contract. Some advanced functions require certified releases and integrations, including Numerish eSign, AI assistance and cryptographically governed document revisions.
Windows · macOS · LinuxiOS · AndroidFree · Pro · SovereignRelease360 verified distribution
PDF STUDIO LEARNING CENTRE
Find the right guide.
Start with basic document tasks, learn the three PDF Studio experiences, troubleshoot safely or inspect the developer contract. Each guide distinguishes generally available workflows from features pending release certification.
01 · USER MANUAL
Learn the PDF Studio workspace
Desktop, Cloud, PDF editing, pages, OCR, forms, reusable signatures, version control and AutoSave360.
Read user manual → 02 · HELP & GUIDESFollow guided PDF tasks
Step-by-step recipes for editing, signing, redaction, crash recovery and support troubleshooting.
Open help & guides → 03 · DEVELOPERSUnderstand Studio integration
Seven source-contract endpoints, permissions, draft and version conflicts, security and OpenAPI.
Read API reference → 04 · CONTINUITY & SAFETYRecover supported unfinished work
Local checkpoints, Cloud synchronization limits, missing keys, version reconciliation and customer consent.
View recovery guidance →Start here
Choose what you want to do next.
PDF Studio is designed as a task-oriented workspace. You do not need to learn every module before starting. Open a document, choose the outcome you need, and follow the contextual workflow. Consequential actions such as redaction, signing, protection and governed publication include additional verification steps.
Learn the workspace
Understand File, Edit, View, Pages, Tools, Forms, eSign, AI, Governance and Help without working through every feature first.
Complete a PDF task
Follow short guided recipes for editing, OCR, merge/split, redaction, PDF/A, comparison and signing.
Verify document integrity
Check release signatures, SHA-256 fingerprints, governed versions, evidence and security state before relying on a consequential document.
Use Numerish eSign
Prepare a signing package, add signers, route the request and retain signature evidence with the governed document record.
Get support
Use in-product Help or Numerish AI Support first. If unresolved, hand the conversation and diagnostics to Support360 as a governed support ticket.
Installation guide
Install only from the verified release catalogue.
The PDF Studio product page is the canonical public distribution entry point. Release360 exposes only Production-approved releases and retains version, platform and checksum history. If no release is listed for your platform, do not obtain an installer from another source.
Security rule
Never install a “cracked”, offline-only, repacked or manually keyed copy. A genuine Pro or Sovereign entitlement is identity/workspace-bound and can be revoked when a lease, device or license becomes invalid.
| Platform | Approved distribution | Install flow | Verification |
|---|---|---|---|
| Windows | Numerish Release360 signed installer | Download → verify → run installer → launch | Publisher signature + SHA-256 |
| macOS | Numerish Release360 notarized package | Download → verify/notarization → install → launch | Apple notarization + SHA-256 |
| Linux | Numerish Release360 platform package | Choose certified package → verify → install | Release checksum/signing evidence |
| iOS / iPadOS | Apple App Store when published | Open store listing → install → launch | App Store distribution identity |
| Android | Google Play when published | Open Play listing → install → launch | Play signing/distribution identity |
Open the official Downloads & Releases page
Select your platform on the PDF Studio product page. Older Production releases remain visible in version history for controlled rollback support.
Verify before installation
For direct desktop packages, compare the displayed SHA-256 with the downloaded file and verify the operating-system publisher signature where available.
Install and launch
Use the normal platform installer. Do not disable security controls, certificate checks or network protection as part of installation.
Choose Free or sign in
Free functionality can operate within its published entitlement. Pro/Sovereign users sign in with their Numerish identity so Account/Administration360 and License360 can resolve the purchased workspace entitlement.
Confirm license & workspace
PDF Studio validates plan, user, workspace, device and lease state. A mismatch does not become a valid license merely because a typed key looks syntactically correct.
License & activation
Identity first; license keys are not the root of trust.
License360 resolves entitlements from the purchasing account/workspace and binds allowed use to policy-controlled devices. This is deliberately stronger than “username + password + static key”. Offline use, where permitted, uses bounded signed leases rather than unlimited trust in a local key.
Free
Core approved local PDF capabilities. No paid entitlement may be unlocked by entering an arbitrary key.
Pro
Purchased user/workspace entitlement, seat/device allowances and advanced PDF, OCR, AI/eSign allowances according to PricingHub/Subscription360.
Sovereign
Enterprise controls, governed revisions, evidence, deployment policy and higher-assurance licensing for regulated estates.
IdentityWho is using PDF Studio?
WorkspaceWhich customer owns the entitlement?
SubscriptionWhat was purchased?
License360What may this device use now?
EvidenceWhat was authorized?
Three connected experiences
Desktop, Cloud and the governed workspace.
Desktop focuses on local PDF workflows; Cloud is designed for browser review and collaboration; the connected workspace binds permissions and revisions to the canonical DocuSphere360 document. The interfaces are related but not interchangeable release promises.
Local PDF work
Open and manage device files with the editing, forms and page operations included in the verified installer. Native durable recovery is pending separately certified integration.
Browser review
Scope authorized documents to a session, inspect previews and review context. Full editor and synchronized server recovery remain dependent on certified integration.
Canonical revisions
Honor tenant ACLs, version IDs, integrity hashes and maker/checker governance. The candidate bridge must be installed and certified before these endpoints can be used.
For the detailed tool comparison, see the platform and edition matrices.
AutoSave360 + Recovery360
Recover the draft, then verify the document.
Supported browser review drafts can be saved as encrypted local checkpoints and offered for restoration after a restart. This is separate from Cloud acknowledgment and from committing a new governed PDF version.
Saved locally
A supported draft reached encrypted browser storage in the original profile. It does not mean it has synced to the server.
Recovery prompt
After reopening, examine the document, draft timestamp and version. Restore only supported data, or explicitly discard it.
Reconcile safely
If the document changed, review the conflict. Never silently overwrite a newer PDF or alter a signature.
Important availability and encryption limits
Browser review-draft recovery was tested in source-stage development; whole-PDF replay, Desktop native journals and Cloud draft synchronization require additional release certification. A local encrypted file alone cannot be decrypted by support without its appropriate key. Clearing browser data or losing keys may make recovery impossible.
User manual
The PDF Studio workspace.
Use the workspace by task. The availability of some commands depends on platform, document state, purchased plan, entitlement and organizational policy.
| Area | Use it for | Typical result |
|---|---|---|
| File | Open, save, Save As, recent files, export and print | Local or governed document output |
| Edit & Annotate | Text edits, highlights, comments, shapes and review markup | Revised working PDF |
| Pages | Insert, delete, rotate, reorder, extract, merge and split | Recomposed PDF |
| Forms | Fill, inspect and process PDF form fields | Completed form |
| OCR | Recognize image-based text and create searchable documents | Searchable PDF |
| Redaction | Mark and permanently apply removal of sensitive content | Redacted derivative/version |
| Protect | Apply permitted PDF security controls and protection policy | Protected PDF |
| Convert / PDF/A | Convert supported content and create archival-format output where certified | Converted or archival PDF |
| Compare | Inspect visual/semantic change between document versions | Difference review |
| Numerish eSign | Prepare recipients, fields, order, send and collect evidence | Signed package/evidence |
| AI | Summarize, extract, explain or assist with authorized PDF tasks | AI-assisted output subject to policy |
| Governance | Create a governed revision, hash, evidence and audit record | Verifiable document version |
| Help | User Manual, Help Guide, Tutorials, About, diagnostics and Support360 | Guidance or support ticket |
Help & guided workflows
Common tasks in a few controlled steps.
The in-app Guided Experience should surface the next best action for the current document. These recipes describe the expected workflow and the point at which an enterprise policy may require confirmation, permission or evidence.
Edit a PDF
- Open the PDF.
- Choose Edit.
- Select content and make changes.
- Save locally or create a governed revision.
Merge or split
- Open Pages/Organize.
- Add files or select ranges.
- Reorder as required.
- Preview and save the result.
OCR a scan
- Open the scanned PDF.
- Choose OCR.
- Select pages/language if offered.
- Review recognized text before relying on it.
Redact safely
- Mark content for redaction.
- Review every mark.
- Apply redactions permanently.
- Save a new governed version when policy requires.
Compare versions
- Choose Compare.
- Select baseline and revised document.
- Review detected changes.
- Export or retain comparison evidence.
Create PDF/A
- Choose Convert/PDF/A.
- Select the certified target profile.
- Resolve reported validation issues.
- Save only after validation succeeds.
Numerish eSign
Prepare, route, sign and retain evidence.
PDF Studio integrates Numerish eSign as a governed workflow rather than treating a drawn signature image as proof. Identity, signer intent, routing, timestamps and resulting document evidence should remain associated with the signature package.
Prepare
Open the final document, confirm the correct governed version and choose eSign.
Add recipients & fields
Enter the intended signer identities, signing order and required signature/initial/date fields.
Review & send
Check recipients, document version and permissions before sending the signature request.
Complete & verify
Track status, receive the completed package and retain the eSign evidence with the document history.
AI-assisted PDF work
AI assists; document authority remains governed.
AI functions are subject to plan allowance, organizational policy, privacy controls and provider availability. AI output should be reviewed by a responsible user before it becomes part of an authoritative document or decision.
Summarize
Create an overview of selected pages or the current document, subject to permitted processing scope.
Extract & explain
Identify structured information, explain selected content or assist with document understanding.
Governed use
Entitlements, privacy policy, audit/evidence requirements and human review remain authoritative over AI convenience.
Document governance
Edits can become verifiable new versions.
For governed workflows, PDF Studio does not silently replace the authoritative document. It can create a new version, compute integrity evidence and synchronize permitted history into the Numerish document/evidence services.
EditPerform authorized PDF work
VersionCreate new governed revision
SHA-256Fingerprint exact document bytes
EvidenceBind identity and action history
AuditRetain governed traceability
Security & integrity
How to know the software and document can be trusted.
PDF Studio security is layered. Release360 controls what binaries are publicly offered; platform signing/notarization protects installer identity; License360 controls paid entitlement; document SHA-256 evidence protects exact document bytes; governed audit records preserve who did what and when.
Installer integrity
Use only the official product page. Verify the SHA-256 shown by Release360 and the operating-system publisher signature or official store identity.
Tamper & license controls
Paid functionality depends on signed entitlements and bounded leases. Revoked, mismatched or invalid licenses fail closed. Offline mode is not an unrestricted bypass.
Document integrity
Governed versions receive SHA-256 evidence so later verification can detect whether the exact document bytes have changed.
Redaction safety
A visual black rectangle is not a redaction. Use the Redaction tool, apply the redaction, then verify the resulting document before distribution.
Privacy
Local workflows minimize unnecessary transfer. Connected AI/eSign/governance features remain subject to authorized processing, policy and applicable privacy controls.
Diagnostics
Operational errors may produce governed diagnostic events for authorized Observability360 and Numerish operational administration. Support exports should exclude document content unless deliberately authorized.
Troubleshooting
Resolve common problems without weakening controls.
If an instruction tells you to disable networking, certificate verification, antivirus/endpoint protection or licensing services to make a key work, stop. That is not a valid Numerish activation procedure.
My license shows invalid or unavailable.
Confirm that you are signed into the purchasing Numerish identity/workspace, the subscription is active, the device is permitted and the system clock is correct. Reconnect so License360 can refresh the signed entitlement/lease. Do not replace it with a third-party key.
I am offline. Can PDF Studio still work?
Permitted local capabilities may continue according to plan and a valid bounded offline lease. An expired or revoked paid entitlement does not become permanent simply because the device stays offline.
No download is shown for my platform.
That means Release360 has no Production-approved public artifact for that platform/channel. Wait for an approved release; do not obtain an installer from an unofficial mirror.
OCR results are imperfect.
Check source scan quality, language and page orientation. Always review recognized text before using OCR output as an authoritative record.
The application crashed or a workflow failed.
Reopen PDF Studio and use Help → Diagnostics/Support. Record the version, platform, workflow and time of failure. Where authorized, attach a diagnostic bundle to the Support360 ticket.
How do I verify a governed PDF?
Compare the document SHA-256 against its governed evidence record and review version/audit history. A changed hash means the bytes are different, even when the page looks identical.
Developer API
Use a versioned source contract—not guessed endpoints.
The PDF Studio bridge source describes seven operations for session, PDF preview, review comments, revision save and draft recovery. These are not yet registered as active production routes. Authentication, tenancy, key management and write gates must be independently certified.
Help & Support360
Escalate with useful evidence.
Use PDF Studio Help → User Manual / Help Guide / Tutorial for contextual guidance. For unresolved problems, use Numerish AI Support and create a Support360 ticket. Include the application version, platform, workflow, timestamp, error reference and diagnostic bundle where policy permits.
Do not include secrets.
Never send passwords, MFA codes, private signing keys, raw license secrets or unnecessary confidential document contents in a support ticket.
DocuSphere360 PDF Studio
Open Downloads & ReleasesStart from a verified release.
Legal & ownership
A KT Group product.
DocuSphere360 PDF Studio forms part of KT Group's portfolio of digital products and enterprise technology solutions.