Tools that live in your browser
STEPlus Tools is a comprehensive collection of 87 developer and productivity utilities that run entirely in your browser — no servers, no sign-ups, no data ever leaving your device. Format and validate JSON, YAML, XML, and SQL with professional CodeMirror editors. Encode and decode Base64, JWTs, and hashes. Calculate SIP returns, EMIs, income tax, and FIRE numbers with 22 financial calculators. Convert units, currencies, colors, and timezones. Generate passwords, QR codes, UUIDs, and gradients. Build cron expressions, mock APIs, and edit CSVs — all with zero latency and full offline support after first load. Perfect for developers, finance professionals, security teams, and anyone working in restricted environments where data privacy is non-negotiable.
Categories
87
Total tools
11 categories, one destination
From financial calculators to Kubernetes dashboards — every tool organized by purpose.
Storage & Explorer
3S3 Explorer, Google Drive, Dropbox
Linters & Validators
11JSON, YAML, XML, HTML, CSS, JS, SQL & more
Calculators
22SIP, EMI, NPS, Tax, FIRE & 17 more
Converters
8Unit, Currency, Color, Timezone & more
Encoders & Decoders
7Base64, JWT, Hash, UUID, QR, AES-256
Text Tools
7Diff, Counter, Case, RegEx & more
Design & Visual
6Gradients, Shadows, Favicon, SVG
Developer Tools
9Cron, HTTP Codes, Meta Tags & more
Data Tools
3CSV Editor, Faker, SQL ↔ JSON
Privacy & Security
5Passwords, SSL, DNS, Privacy Policy
Cloud & Infra
1Kubernetes Dashboard
Find any tool instantly
Navigate by category or hit ⌘K to search across all 87 tools. Every tool is one click away.
Instant Search
Full-text search across names, descriptions, and keywords. Results ranked by relevance.
Keyboard Shortcuts
⌘K to open search, arrow keys to navigate, Enter to select — never touch your mouse.
Smart Categories
11 color-coded categories with tool counts. Jump straight to what you need.
Related Tools
Every tool page shows similar tools — discover utilities you didn't know you needed.
Your data never leaves
Every tool runs entirely in your browser. No server calls, no tracking, no telemetry. Your data stays on your device — period.
Works Offline
After first load, every tool works without internet. Perfect for air-gapped environments.
AES-256 Encryption
Local storage data encrypted with AES-256 via the Web Crypto API.
Full Transparency
Open your browser dev tools — zero network requests during tool execution.
Most used tools
The tools developers reach for every day — from JSON formatting to password generation.
JSON Linter
Validate, format, and beautify JSON with syntax highlighting
Base64 Encoder
Encode and decode Base64 strings with one click
SIP Calculator
Calculate returns on systematic investment plans
Regex Tester
Test and debug regular expressions with live matching
Color Converter
Convert between HEX, RGB, HSL, and CMYK formats
JWT Decoder
Decode and inspect JWT tokens without any server calls
Gradient Generator
Create beautiful CSS gradients with live preview
Password Generator
Generate strong, customizable passwords with entropy scoring
Cron Builder
Build and validate cron expressions with human-readable output
CSV Editor
View, edit, filter, and transform CSV data in a spreadsheet UI
Built for speed and privacy
Every feature designed with one principle: your data stays on your device.
100% Client-side
Every tool runs in your browser — no data transmission, no server processing whatsoever.
Works Offline
Full functionality after first load. Service workers cache everything for air-gapped use.
CodeMirror 6 Editor
Professional code editor with syntax highlighting for JSON, YAML, XML, SQL, CSS, JS, and more.
Instant Results
Zero latency — results appear as you type with no network round-trips to slow you down.
Always Free
No accounts, no limits, no ads, no premium tiers — just tools that work, forever.
Developer-first
Keyboard shortcuts, keyboard navigation, copy-to-clipboard, dark mode — built for developers.
Three steps, zero friction
No sign-ups, no installations, no configuration. Just open and use.
Open any tool
Navigate by category or hit ⌘K to search — 87 tools organized across 11 categories.
Paste or type your data
Input goes directly into the browser engine — nothing touches a server, ever.
Get instant results
Output appears immediately — copy, download, or continue editing. Zero wait time.
Built for everyone
From solo developers to enterprise security teams — tools that work everywhere, for everyone.
Daily Development
Format JSON, decode Base64, build cron expressions, test regex — everything you reach for daily.
Financial Planning
SIP, PPF, NPS, EMI, income tax, and FIRE calculators for personal and business finance.
Security Audits
Generate strong passwords, decode JWTs, check SSL certificates, and test DNS — without leaking data.
Client Work
Use tools in client environments where data privacy is non-negotiable. Zero data leaves the browser.
Learning & Teaching
Interactive linters, regex testers, and format converters that show results as you type.
Enterprise Compliance
Air-gapped environments, restricted networks, audit-friendly — no external dependencies at all.
Help us improve
Tools gets better with every piece of feedback. Report issues or suggest new tools — we're listening.
Found a bug?
Something not working as expected? Report it with steps to reproduce and we'll prioritize a fix.
Report a bugHave an idea?
Want a new tool or improvement? Share your request and help shape the roadmap.
Request a featureOther products you might like
Explore more tools from the STEPlus ecosystem.
Start using Tools today
87 tools, 11 categories, zero data transmitted. No sign-up needed — just open and start using.