35 Free Tools · No Login Required

Engineering Made Easy

Simplify your workflow with powerful conversion, encoding, and calculation tools — all in one place, free and instant.
Popular Tools
CRC Calculator
Calculate CRC checksums with 100+ algorithms for data integrity verification
Drone Calculator
Calculate drone thrust, TWR, hover throttle, flight time, and battery C-rating safety. Compare up to 4 motor/battery/propeller configurations side by side.
Time Calculator
Add or subtract hours, days, and more from any date; copy Unix epoch seconds (timestamp). Time difference between two datetimes, work hours with break deduction. 400+ timezones, DST-aware.
3D Rotation Converter
Convert between Quaternions, Euler Angles, and 3×3 Rotation Matrices bidirectionally with interactive 3D visualization
Bezier Curve Editor
Interactive cubic Bezier curve editor with real-time animation preview, 35 easing presets, side-by-side comparison, and code export for CSS, Unity C#, C++, and JavaScript.
Base32 Encoder/Decoder
Encode and decode Base32 data for TOTP, 2FA secrets, and human-readable encoding
Categories
All Tools (35)
3D Rotation Converter
Convert between Quaternions, Euler Angles, and 3×3 Rotation Matrices bidirectionally with interactive 3D visualization
3D Rotation Visualizer
Visualize 3D rotations using Quaternions, Euler Angles, and Rotation Matrices with interactive 3D visualization
ASCII Converter
Convert text to ASCII codes and vice versa with multiple formats
Base32 Encoder/Decoder
Encode and decode Base32 data for TOTP, 2FA secrets, and human-readable encoding
Base64 Encoder/Decoder
Encode and decode Base64 data with support for files and URLs
Bezier Curve Editor
Interactive cubic Bezier curve editor with real-time animation preview, 35 easing presets, side-by-side comparison, and code export for CSS, Unity C#, C++, and JavaScript.
Color Converter
Free online color converter: HEX, RGB, HSL, HSV, HWB, CMYK, and NCol with bidirectional editing. Generate complementary, analogous, triadic, tetradic, and Tailwind-style palettes. WCAG 2.1 contrast vs white/black, color history, one-click copy. Runs in your browser.
CRC Calculator
Calculate CRC checksums with 100+ algorithms for data integrity verification
Cron Expression Parser
Parse Linux (5-field) and Quartz/Spring (6–7 field) cron expressions: human-readable schedule, next N execution times in any IANA timezone, expression builder, presets, and quick reference. Runs locally in your browser.
Drone Calculator
Calculate drone thrust, TWR, hover throttle, flight time, and battery C-rating safety. Compare up to 4 motor/battery/propeller configurations side by side.
Elapsed Time Calculator
Compute the duration between two datetimes in years, months, weeks, days, hours, minutes, and seconds. Supports timezones and DST-aware calculations for planning and log analysis.
Endian Converter
Free online endian converter and byte swap calculator. Convert big endian to little endian with memory layout visualization, C bswap code generator, IEEE 754 float byte order, and htonl/ntohl reference for embedded and network developers
File Hash Calculator
Compute cryptographic hashes for files and text in your browser: MD5, SHA-1, SHA-256, SHA-384, SHA-512, SHA3, Blake2, and more. Drag-and-drop files, hex/base64 output, side-by-side comparison. Nothing uploaded—runs locally with Web Crypto.
Format Converter
Convert between YAML, JSON, and TOML for Docker Compose, Kubernetes, CI/CD, and app config. Validate syntax, preserve structure where possible, and edit in-browser—no upload.
HTML Entity Converter
Encode and decode HTML entities with named, decimal, hexadecimal, and mixed styles; selective modes for essential, extended, or Unicode characters; interactive entity reference. Client-side only.
HTTP Code Generator
Build REST and API HTTP requests visually and export ready-to-run code: cURL, JavaScript fetch/Axios, Python requests, Go, Rust reqwest, Java HttpClient, and more—with headers, query, JSON body, and auth.
JSON Formatter
Format and validate JSON with order-preserving pretty print, interactive Tree View, sortable Table View for arrays of objects, YAML export, and compact/minify options—all in your browser. No upload.
JWT Encoder & Decoder
Decode JWT header and payload, verify HS256/HS384/HS512 signatures with your secret, inspect exp/iat/nbf/iss/sub/aud, and encode new JWTs from JSON—all in the browser. No upload; ideal for API auth debugging and learning RFC 7519.
Log Timestamp Sorter
Paste log lines, auto-detect ISO-8601, Unix epoch, and RFC 2822 timestamps, normalize to UTC or local time, sort chronologically, and export. Great for debugging distributed systems—client-side only.
Markdown Editor
Live Markdown preview with GitHub Flavored Markdown: tables, task lists, footnotes, math-friendly layout, table of contents, and HTML export. Ideal for README and docs—runs in your browser.
Number Base Converter
Convert numbers between binary, decimal, hexadecimal, and octal with precision
Password Generator
Create strong passwords and tokens with adjustable length, character sets (upper, lower, digits, symbols), exclude ambiguous characters, and optional pronounceable or passphrase modes—generated locally in your browser.
QR Code Generator
Free QR code generator in your browser: plain text, URL, WiFi (WPA/WPA2/WEP), vCard contacts, mailto, tel, and SMS. Adjust Reed–Solomon error correction (L–H), foreground/background colors, module size, quiet zone, and download vector SVG or PNG. Runs locally in WebAssembly—nothing is uploaded.
Regex Tester
Test regular expressions with live highlighting, capture groups, multiline and dotall modes, and find-and-replace. Built on the Rust regex engine in WebAssembly—private, fast, no server round-trip.
Robot Arm FK/IK Calculator
Robot arm kinematics for learning & practice: FK/IK, DH tables, Jacobian—aligned with cobots, industrial robots, humanoid arms, and AI robotics workflows. Robot programming friendly (CSV export). 2–6 DOF, SCARA, UR/KUKA-style presets, 3D visualization. Runs in your browser.
Text Case Converter
Convert naming conventions for code and docs: camelCase, PascalCase, snake_case, kebab-case, flat case, alternating case, sentence/title case, and more. Batch-friendly, copy results locally.
Text Diff Comparator
Compare two texts or code snippets with side-by-side, inline, and unified diff views. Spot changes for code review, config drift, and documentation—processed locally in your browser.
Time Calculator
Add or subtract hours, days, and more from any date; copy Unix epoch seconds (timestamp). Time difference between two datetimes, work hours with break deduction. 400+ timezones, DST-aware.
TLS Certificate Analyzer
Decode PEM or DER X.509 certificates in the browser: subject/issuer, validity, SAN, key usage, fingerprints, and chain relationships—useful for HTTPS debugging and DevOps. No upload to a backend.
TOTP Generator
Generate RFC 6238 TOTP codes from a Base32 secret: SHA-1/SHA-256/SHA-512, 15/30/60s steps, 6 or 8 digits. otpauth:// QR for authenticator apps, verify with time drift tolerance, optional HMAC debug. Client-side only.
Unit Converter
Convert metric and imperial units for length, mass, temperature, pressure, speed, area, volume, data storage, time, energy, and more. Handy for engineering, travel, and homework—runs locally.
Unix Timestamp Converter
Convert Unix epoch seconds to readable dates and back. ISO 8601 & RFC formats, millisecond-aware input, 400+ IANA timezones, DST-aware. Runs locally in your browser.
URL Encoder/Decoder
Percent-encode or decode URLs and text with UTF-8 support. Encode reserved characters for query strings and APIs; decode for debugging. Runs entirely in your browser.
UUID Generator
Generate cryptographically random UUID v4 values with one click using your browser’s secure RNG and WebAssembly. RFC 4122 compliant, copy to clipboard, no server—ideal for IDs and testing.
XML Formatter & Viewer
Format, validate, minify, and explore XML with expandable tree view, line/column errors, and SOAP/config-friendly editing. All processing stays in your browser.