Tools
Online tools.
Small utilities that run directly in your browser. No installation is needed for converting, previewing, or generating embedded assets.
Online Tools
Data Converters
Convert values between number bases, encodings, and byte formats for firmware work.
Hex, Base64 & Byte Array Converter
Convert UTF-8, Hex, Base64, decimal bytes, C/C++ arrays, Uint8Array, and escaped strings in your browser.
Open toolNastrotek recommendsJSON to C Array/Struct Converter
Convert a JSON object into a C typedef struct and a designated initializer for firmware configs.
Open toolBinary / Bitwise Calculator
Convert decimal, hex, binary, and octal values and run bitwise AND, OR, XOR, shift, and rotate operations.
Open toolColor Picker & Converter
Pick a color and convert it to HEX, RGB, HSL, HSV, RGB565, and decimal, plus generate embedded C code.
Open toolImage Format Converter
Convert PNG, JPG, WebP, and SVG images to PNG, JPG, or WebP with resize and background options.
Open toolJSON & Text Tools
Format, validate, and preview JSON, Markdown, and MDX content.
JSON Formatter & Validator
Validate, format, and minify JSON with precise line/column error reporting.
Open toolPopularMDX Preview Online
Upload an .mdx or .md file and preview the rendered Markdown/MDX content directly in your browser.
Open toolRegular Expression Tester
Test regex patterns against sample text with live match highlighting, capture groups, and a replace preview.
Open toolMarkdown to HTML Converter
Convert Markdown to HTML with GitHub-flavored tables, task lists, and a live preview.
Open toolNewText Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more.
Open toolNewURL Encoder / Decoder
Encode or decode URLs and query strings with percent-encoding, with a component/full-URI mode and form-style +.
Open toolJWT Debugger & Token Generator
Decode a JWT's header/payload, check expiry, verify HS256/384/512 signatures, and generate signed tokens in your browser.
Open toolEmbedded Assets
Generate image, font, and QR code assets ready to embed in firmware.
OLED/TFT Preview & C Array Tool
Convert images to monochrome, grayscale, or RGB565 byte arrays for Arduino, ESP32, OLED, and TFT projects.
Open toolLVGL Font Converter
Create compact LVGL bitmap fonts from TTF, OTF, or WOFF files with ASCII, number, Vietnamese, or custom glyph subsets.
Open toolQR Code Generator
Create QR codes for text, URLs, Wi-Fi, email, phone, and vCards, then export PNG, SVG, or an embedded C array.
Open toolProtocol Parsers
Decode and inspect wireless protocol payloads.