About bitlist

bitlist is a privacy-first suite of browser-based tools for developers, creators, and everyday problem solving.

bitlist is a free, privacy-first suite of 40+ browser-based developer tools, converters, and calculators available at bitlist.io. Every tool runs entirely client-side in JavaScript — no account required, no data uploaded to servers. Sensitive inputs like tokens, passwords, API payloads, and financial figures never leave your device.

The platform covers seven categories: network & security (IP lookup, DNS, WebRTC leak test), developer & API tools (JSON formatter, JWT decoder, regex tester, hash generator, cURL converter, cron builder), data encoding (Base64, URL encoder, JSON↔YAML↔CSV↔XML), media & files (image tools, PDF tools, QR code), text & writing (word counter, diff checker, password generator, UUID generator, ASCII art), time & unit utilities (Unix timestamp, unit converter, time difference), and finance calculators (SIP, loan EMI, mortgage, retirement planner, debt payoff).

Core Principles

Privacy-first: All processing happens in your browser. No data is sent to bitlist servers.
No signup required: Every tool is accessible instantly — no account, no email, no paywall.
Practical UX: Clear inputs, instant output, and minimal steps to results.
Reliable output: Strong defaults with controls for advanced users.

Tool Directory

Network & Security

My IP Address — Check your public IPv4/IPv6, ISP name, ASN, and approximate location.
WebRTC Leak Test — Detect if your browser is leaking your real IP through WebRTC, even behind a VPN.
Website Status Checker — Check if a site is up or down from multiple locations.
DNS Lookup — Query A, AAAA, MX, TXT, CNAME, NS, SOA, PTR, SRV, and CAA records for any domain.

Developer & API Tools

JSON Formatter — Beautify, minify, and validate JSON. Safe for sensitive API payloads.
SQL Formatter — Format and beautify SQL queries with proper indentation and keyword casing.
JWT Decoder — Decode JWTs, inspect header/payload/claims, and verify HMAC signatures locally.
Regex Tester — Test and debug regular expressions with real-time match highlighting.
Hash Generator — Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes via the Web Crypto API.
cURL to Code Converter — Convert cURL commands to Python, JavaScript, PHP, Go, and more.
Cron Expression Generator — Build and validate cron expressions with a visual editor.

Data Encoding & Conversion

Base64 Converter — Encode text to Base64 or decode Base64 strings.
URL Encoder / Decoder — Percent-encode characters for URLs or decode URL-encoded strings.
Data Converter — Convert between JSON, YAML, CSV, and XML formats.

Media & Files

Image Tools — Convert, resize, and compress images (JPG, PNG, WebP, GIF) in the browser.
PDF Tools — Merge, split, compress, and convert PDF files.
QR Code Generator — Generate QR codes for URLs, text, and Wi-Fi credentials.

Text & Writing

Word Counter — Count words, characters, sentences, and reading time.
Text Diff Checker — Compare two text blocks and highlight differences line by line.
Password Generator — Generate cryptographically random passwords with configurable options.
UUID Generator — Generate UUID v4 identifiers.
Lorem Ipsum Generator — Generate placeholder text for mockups.
ASCII Art Generator — Convert text to ASCII art banners.

Time & Unit Utilities

Unix Timestamp Converter — Convert Unix timestamps to human-readable dates and back.
Time Difference Calculator — Calculate the difference between two dates or times.
Unit Converter — Convert between units of length, weight, temperature, data, speed, and area.

Finance Calculators

Investment Calculators — SIP, Step Up SIP, Lumpsum, and SWP for mutual fund planning. Supports INR, USD, GBP, EUR, JPY.
Loan Calculators — EMI calculator for personal, car, and business loans.
Mortgage Calculator — Home loan EMI with property tax, insurance, and PMI.
Interest Calculators — Simple, compound, and continuous compounding.
Retirement Planner — Estimate the corpus needed based on monthly expenses and timeline.
Saving Goal Calculator — Calculate monthly savings required to reach a financial goal.
Debt Payoff Calculator — Avalanche and snowball strategies for paying off multiple debts.

Privacy & Trust

All tool processing happens client-side in JavaScript. No user data is transmitted to bitlist servers. IP lookup queries go directly from the user's browser to public APIs (ipify.org). bitlist does not use tracking cookies. No account or signup is required for any tool.

Continuous Improvement

Tool quality is improved continuously based on usage patterns and feedback. Priorities include faster processing, better guidance content, stronger accessibility, and clearer troubleshooting support on every page.