Local processing
Files used by the browser tools stay in this browser. Usage counts do not include their contents.
Opselith
Build scripts, prepare Microsoft 365 migrations and handle everyday admin tasks.
Local browser toolsNo account requiredDoes not connect to Microsoft 365
COMMAND CENTER
All tools →What do you need to do?
Search for what you need to do, or choose a tool below.
Quick tasks
MIGRATION WORKSPACEBefore, during and after your Microsoft 365 migration.
Open Migration Workspace →BEFORE Check readiness and the domain.MIGRATION DAY Follow the move in order.AFTER Review differences and migration reports.
OPSELITH PRO30 days €7.99 · 1 year €59.99
Extra PowerShell, Packs and migration tools · One-time · No automatic renewal · Sales are not open yet.
See what Pro adds →PowerShell BuilderBuild and review PowerShell scripts for everyday admin tasks, then run them in your own PowerShell session.
Open PowerShell Builder →PowerShell Script CheckerCheck a script locally for common risks and legacy commands.
Check a PowerShell script →CSV ToolkitClean and transform CSV or TSV files locally.
Open CSV Toolkit →CSV DoctorDiagnose and repair broken CSV files locally.
Open CSV Doctor →More tools
Microsoft 365 Error HelpGet a short explanation and next steps for common admin errors.
Check an error →Data ConverterConvert CSV, JSON, XML, YAML and TSV locally.
Open Data Converter →List CompareFind missing, matching and duplicate values in two lists.
Open List Compare →Migration Mapping ValidatorMatch users between the old and new Microsoft 365 environments.
Open Mapping Validator →Password GeneratorCreate passwords and passphrases locally.
Open Password Generator →Naming BuilderBuild consistent Microsoft 365 naming rules.
Open Naming Builder →JWT DecoderInspect JWT headers and claims locally.
Open JWT Decoder →Admin workflowsStep-by-step admin tasks.
Choose a workflow
Pick a task and work through it step by step.
Pro previews · 8 packs Migration, security and governance
Pro is not for sale yet.Preview the scope now. Pro Pack access follows the eligible Opselith Pro or tester key you use. Paid Pro access ends when the key expires.Browse Pro Pack guides →
PowerShell by platformFind scripts for Active Directory, Entra, Exchange and more.7 platforms
POWERSHELL BY PLATFORMBrowse PowerShell scripts by platform.
Open PowerShell Builder →Continue workingView recent →
PinnedView pinned →
HOW IT WORKS
Find the task. Configure it. Review the result.
01
FindSearch or choose the admin task.
02
ConfigureEnter only what the task needs.
03
ReviewCheck the output before you use it.
PRINCIPLESPrivate by design.
Private by design.
Clear by default.
Opselith keeps the main task simple. Working files stay in your browser for the core tools, and deeper technical details stay available when you need them.
No account layer
Open a tool and start. No profile, onboarding or consent flow.
Transparent output
You can see and review the script or converted data before you use it.
Focused scope
Each tool solves a specific administrative task without feature clutter.
ABOUT OPSELITH01 02 03
A workbench for everyday admin work.
Opselith is an independent browser-based IT administration toolkit for PowerShell, Microsoft 365 migration preparation and focused local admin tools. About Opselith →
What it is
Scripts, migration prep and browser tools.
Who it is for
IT admins and support.
How it helps
Prepare, validate, review.
04 · BOUNDARIES
What it does not do.
Does not connect to Microsoft 365No hidden uploadsNo automatic runsManual checks stay manual
FEATUREDUseful scripts.
Useful scripts.
Ready when you are.
Explore a PowerShell script worth using, then open it directly in the Builder.
FEATURED SCRIPT
Export inactive AD users
Quickly identify enabled Active Directory users whose last logon is older than your chosen threshold. Read-only, intermediate level and designed for recurring directory hygiene.
ROADMAP
What is being improved now.
The current release makes guided admin work easier to resume, review and move between workflows and PowerShell.
LIVE
PowerShell 147
The library now includes 147 guided PowerShell scripts across Active Directory, Entra ID, Exchange Online, Teams, Intune, SharePoint and migration work.
92 Free · 55 ProCURRENT
Migration Workspace
Check before the move, follow migration day and review the result in one local project.
Pre-checks · Migration day · Reports · After checksNEXT
Deeper migration guidance
Add more migration checks and vendor-ready workflows only where they save real admin work.
Driven by real migration needsLATER
Feedback-driven improvements
Search patterns, tester feedback and real usage will continue to guide where Opselith needs more depth.
Usage and tester feedbackBUILT FOR
Technical teams that value clarity.
System administratorsPowerShell · Passwords · CSV
Microsoft 365 adminsEntra · Exchange · Migrations
Security teamsJWT · Audits · Naming
Support engineersConvert · Clean · Validate
Opselith is independent.Feedback and voluntary support help improve the tools.
FAQ
Common questions.
A few practical answers before you start.
Are the PowerShell scripts free?
The PowerShell Builder includes 92 free scripts at no cost, plus 55 Pro scripts that are visible for preview. Public Pro sales are not open yet. Planned one-time access is 30 days for €7.99 or 1 year for €59.99, with no automatic renewal. Existing tester or Pro keys can still be used where access is provided.
Can I use Opselith with sensitive IT data?
The core browser tools are designed for local processing and do not require uploading working files to an Opselith processing server. Always follow your organization's data-handling policy.
Does the PowerShell Builder connect to Microsoft 365?
No. Free scripts are generated locally in your browser. Pro scripts are generated securely after server-side Pro license validation. It does not connect to Active Directory, Microsoft Entra ID, Exchange Online, Teams, Intune or SharePoint Online on your behalf.
What platforms does the PowerShell Builder cover?
The published library covers Active Directory, Microsoft Entra ID, Exchange Online, Microsoft Teams, Microsoft Intune and SharePoint Online, with more Microsoft 365 administration coverage planned.
More questions (4)
Are Pro scripts visible before I buy Pro access?
Yes. Pro scripts are visible in the library so you can discover what is available, inspect their purpose and review their requirements. Pro access is required to generate the actual Pro script.
Does Opselith send my files or generated scripts to a server?
The browser tools are designed for local processing, and usage analytics do not include file contents, generated content or input data. Free PowerShell scripts are generated locally. For Pro generation, only the configuration values required by the selected template are sent to Opselith after license validation; Opselith does not connect to your Microsoft 365 environment.
Can I review a script before I run it?
Yes. The Builder shows the script purpose, permissions, compatibility, inputs and generated output so you can review the result before running it. Opselith does not run the generated script for you.
What is included with Opselith Pro?
Pro Preview currently covers 55 Pro PowerShell scripts plus the advanced migration, security and governance Packs. Pro licensing is handled through the secure Opselith licensing flow, while the Pro source remains server-side rather than being shipped to the public browser bundle.
START
Open the toolkitGet the job done.
Pick a tool and get started. No account needed.
Was this useful?One click. No email.
⌘K