Online toolbox for developers
20+ everyday tools, ready to use. Everything is processed in your browser; nothing is uploaded.
Recently used
Dev & Debug
JSON Formatter
Format, minify, validate and escape JSON. Big numbers keep their precision, nested JSON strings can be expanded, and errors point to the exact line and column.
Code Beautifier & Minifier
Beautify JavaScript, CSS, HTML, XML and SQL code, and minify CSS, HTML and SQL.
Text Diff Checker
Compare two texts, code, JSON or logs by line, word or character, ignoring case or whitespace if you like, with inline and side-by-side views.
Regex Tester
Test JavaScript regular expressions online: live match highlighting, capture and named groups, replacement, common presets, and automatic timeout for runaway patterns.
Unix Timestamp Converter
Convert Unix timestamps to dates and back. Auto-detects seconds / milliseconds / microseconds / nanoseconds, supports any time zone and DST, and shows the current timestamp.
Encoding
Base64 Encoder / Decoder
Encode and decode Base64 text. Handles UTF-8 (Chinese, emoji), the URL-safe alphabet and optional padding.
URL Encoder / Decoder
Percent-encode and decode URLs, either a whole link or a single component, and break a URL into protocol, host, path and query parameters.
Unicode / HTML Entity / Hex Converter
Convert text to and from \uXXXX escapes, HTML entities (&#x…;) and UTF-8 hex bytes. Emoji are handled correctly.
JWT Decoder
Decode a JWT header and payload, interpret the exp / iat / nbf times and verify HS256 / HS384 / HS512 signatures with a secret. Everything stays local; the token is never uploaded.
Hash Generator (MD5 / SHA)
Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, and compare against a known hash to check a file was not altered.
Generators
UUID / ULID Generator
Generate UUID v4, UUID v7 (time-sortable), ULID and short IDs in bulk using the browser’s secure random numbers, with optional uppercase and no hyphens.
Password Generator
Generate strong random passwords: choose the length and character types, exclude look-alike characters, use the browser’s secure random numbers, and see entropy and strength live. Nothing is uploaded.
QR Code Generator & Reader
Turn text or links into QR codes (adjustable error correction, colors and size; download PNG / SVG) and read QR codes from images. Everything runs locally in your browser.
Text
Word & Character Counter
Count characters, CJK characters, words, lines, paragraphs, sentences and bytes in real time, and estimate the reading time.
Case & Naming Converter
Switch between UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case in one click, for identifiers and text cleanup.
Line Tools (Dedupe / Sort)
Process text line by line: remove duplicates, sort ascending / descending / numerically, reverse, shuffle, drop blank lines, trim, number lines, add prefixes and suffixes.
Markdown Preview & HTML Converter
Live Markdown preview with GFM tables, task lists and code blocks, plus one-click copy or download of the generated HTML. The preview is sanitized.
Image & Color
Image ⇄ Base64 Converter
Convert images to Base64 / data URIs (with ready-made <img> and CSS snippets) and turn Base64 back into an image you can preview and download. Images are never uploaded.
Image Compressor & Converter
Compress images, resize them and convert to JPEG / WebP / PNG right in your browser. Batch processing with live size comparison; images never leave your device.
Color Converter & Picker
Convert between HEX, RGB, HSL, HSV and CMYK, use the color picker and screen eyedropper, and check WCAG contrast against a background color.
Calculators
Converters
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