Free online tools

21+ tools for developers and creators. Every tool runs in your browser — no upload, no signup, no telemetry.

Developer tools

6 tools

Format, encode, and inspect data the way developers actually do.

Beautify, minify, and validate JSON instantly in your browser. 100% client-side, zero server upload.

Cryptographic Hash Generator & File Checksum Suite

Calculate SHA-256, SHA-512, SHA-384, SHA-1, MD5, and HMAC signatures for text and local files in your browser. 100% private Web Crypto execution.

JWT Decoder & Security Inspector

Decode JSON Web Tokens (JWT) Header, Payload, and expiration status in your browser. 100% client-side memory parsing, zero telemetry, RFC 7519 compliant.

Cron Expression Generator & Parser

Build, parse, and validate cron schedule expressions with human-readable natural language translation, visual field picker, and upcoming execution timeline.

Regex Tester & Visualizer

Test, debug, and visualize regular expressions in real time. Zero-knowledge client-side evaluation with capture groups and presets.

cURL to Code Converter

Convert cURL command lines into JavaScript (Fetch, Axios), Python (Requests, HTTPX), Go, Rust, and PHP. Zero server logging.

Encoders & decoders

2 tools

Move data between encodings — Base64, URL, percent — without leaving the browser.

Base64 Encoder & Decoder

Encode and decode Base64 strings with UTF-8 safety, URL-safe mode, and MIME/PEM line formatting. 100% client-side.

URL Percent-Encoder & Parameter Inspector

Percent-encode and decode URLs adhering to RFC 3986. Switch between encodeURI and encodeURIComponent, inspect query parameters, and handle UTF-8 characters.

Generators

2 tools

Spin up passwords, UUIDs, and other identifiers with cryptographic randomness.

RFC 4122 & RFC 9562 UUID / GUID Generator

Generate cryptographically secure RFC 4122 v4 and RFC 9562 v7 time-ordered UUIDs in bulk. Formats include standard, no-hyphen, and braces.

NIST SP 800-63B Strong Password & Passphrase Generator

Generate cryptographically secure random passwords, memorable Diceware passphrases, and PINs following NIST SP 800-63B guidelines. Shannon entropy and crack time estimator.

Image tools

4 tools

Create and tweak images for web, print, and mobile.

QR Code Generator & Vector Styler

Generate standards-compliant ISO/IEC 18004 QR codes for URLs, Wi-Fi, vCard contacts, and text. Download vector SVG & 2X HD PNG.

Image Compressor & WebP Converter

Compress and convert JPEG, PNG, and WebP images client-side. Live byte-savings preview, custom quality, and zero server upload.

Color Picker & Palette Studio

Convert colors across HEX, RGB, HSL, HSV, OKLCH, and CMYK with live WCAG 2.1/2.2 contrast ratio analysis, tonal scales, and color harmonies.

SVG to PNG Converter

Convert SVG vector graphics to high-resolution PNG images instantly in your browser. Customizable dimensions, Retina/4K scaling, and background color.

Text tools

4 tools

Manipulate text — case, count, placeholder, transform.

Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences, or words. Perfect for UI mockups, graphic design, and typesetting.

Text Case Converter

Convert text between 12 standard cases: camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and more.

Word & Character Counter

Real-time word count, character count, sentence volume, reading/speaking times, and SEO title/description limit meters.

Text & Code Diff Checker

Compare two texts, code snippets, or JSON files with side-by-side and unified diff views. 100% in-browser, no upload.

Converters

3 tools

Convert between units, formats, and markup — length, mass, temperature, Markdown, and more.

Universal Unit Converter

High-precision unit converter supporting Length, Mass, Temperature, Volume, Time, and Digital Storage compliant with BIPM SI and IEC standards.

Markdown to HTML Converter

Convert Markdown to clean, sanitized HTML with live dual-pane preview, GFM tables, task lists, reading time metrics, and one-click .html export.

Unix Timestamp & Epoch Converter

Convert between Unix timestamps and human-readable dates with real-time ticking clock, global multi-timezone matrix, millisecond auto-detection, and Year 2038 health audit.