Network
Traceroute Visualizer: Map Packet Route & Router Hops
Packet latency and connection drops often occur at intermediate autonomous network hops between your device and the destination…
⚡ 100% Free Online Tools & SaaS Utilities
100% Free Online Tools for Developers, Creators & Students
Blazing-fast, client-side, privacy-first web utilities, network diagnostics, and AI productivity tools without signups or paywalls.
💻
Master Suite
Developer & Cryptography Suite
JSON formatters, Base64 converters, JWT analyzers, URL encoders, and hash generators. 100% private in-browser computation.
Open Developer Suite
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Master Suite
Financial & Wealth Toolkit
PPF calculation, CAGR, compound interest, SIP growth, and loan EMI schedules with interactive charts.
Open Finance Suite
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Master Suite
Network Telemetry Suite
Live traceroute maps, DNS propagation inspection, SSL certificate analyzers, simulated port checks, and bandwidth estimators.
Open Network Suite
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Master Suite
Color Palette & Design Studio
Spacebar color generator (10 colors), live real-world UI mockups, photo color extractor, WCAG 2.1 contrast matrix, and Tailwind scales.
Open Color Studio
Security
Network Port Scanner: Audit Common Ports & Socket Services
Auditing open TCP socket ports helps network administrators identify exposed services, misconfigured firewalls, and server security vulnerabilities. 99tools…
Security
SSL Certificate Checker: Verify Expiration Date & TLS Chain
An expired SSL/TLS certificate triggers severe browser security warnings, destroying organic visitor trust. 99tools SSL Certificate Checker tests…
Developer
HTTP Header Checker: Audit Response Headers & Security Status
Inspect server response codes (200, 301, 302, 404, 500), evaluate HTTP Strict Transport Security (HSTS), Content-Security-Policy (CSP), and…
Network
Domain WHOIS & RDAP Lookup: Check Registrar & Expiry Date
Query authoritative domain registry databases to inspect domain creation history, registration expiry dates, active nameservers, and accredited registrar…
Network
DNS Lookup & Propagation Checker: A, MX, TXT & NS Records
Diagnose domain name resolution, verify Google Workspace or Microsoft 365 mail exchange (MX) records, and audit SPF/DKIM TXT…
Developer
User Agent Checker: Browser Signature & Device Inspector
Every HTTP request sends a User-Agent header specifying the client browser version, rendering engine, and operating system architecture.…
Network
My IP Address Finder: Public IPv4, IPv6 & Geo-Location
Identify your device’s external public internet protocol address, internet service provider (ISP), and autonomous network routing data in…
Network
Bandwidth & Download Time Calculator: Mbps to MB/s Converter
Understanding the difference between megabits per second (Mbps, advertised by internet service providers) and megabytes per second (MB/s,…
Health
BMI Calculator: Body Mass Index & Healthy Weight Range
Body Mass Index (BMI) is a globally recognized biometric indicator used by the World Health Organization (WHO) to…
Utility
Chronological Age Calculator: Exact Years, Months, Days & Hours
Need to verify your exact chronological age for official government filings, competitive examinations, medical forms, or insurance applications?…
Finance
Income Tax Calculator FY 2025-26: Old vs New Regime Comparison
Navigating the differences between the Old Tax Regime and the revised New Tax Regime (Section 115BAC) requires comparing…
Engineering, Guides & Whitepapers
From The 99tools Journal
When AI Agents Start Negotiating With Other AI Agents, Who Is Legally Responsible?
In late 2024 and early 2025, AI agents interacted primarily with humans: drafting replies, summarizing documentation, and answering inquiries. By…
The Best AI Model Isn’t Always the Best Coder: How to Choose an LLM in 2026
When a frontier model claims the #1 spot on general leaderboards like LMSYS Chatbot Arena or MMLU, engineering managers instinctively…
Why AI Agents Fail in Production: Memory, Permissions & Observability Breakdown
Building a working AI agent demo in a Jupyter notebook takes an afternoon: wire an LLM to three function tools,…
Why 99tools?
Engineered for Performance & Zero Friction
Most tool sites are cluttered with slow ads, forced signups, and trackers. 99tools is designed to be the exact opposite.
Instant Local Computation
Base64 encoders, subnet calculators, and formatters execute directly inside your browser with native JS for zero server latency.
Guaranteed Data Privacy
Your sensitive tokens, passwords, and JSON payloads never touch external logging servers. What happens on your machine stays on your machine.
Modern AI & Agent Tools
Stay ahead of technological transitions with our curated Agentic AI guides, prompt visualizers, and autonomous productivity workflows.
Frequently Asked Questions
Everything you need to know about using 99tools and our SaaS solutions.
Are all tools on 99tools really 100% free?
Yes! All calculators, network diagnostics, and developer utilities are completely free to use for both personal and commercial projects without any subscription or credit card requirement.
Do you store or log the data I input into the tools?
No. We prioritize client-side execution. Formatters, Base64 decoders, hash generators, and calculators operate locally in your web browser. Network diagnostics (like WHOIS and Traceroute) only query public records without storing user input.
Can I request a new tool to be added?
Absolutely. Click the "Request a Tool" button in the footer or visit our contact page to suggest calculators, API tools, or SaaS utilities you would love to see.