Dev
24 tools
JSON Formatter
Format, minify and validate JSON with error locating and one-click copy.
Timestamp Converter
Convert between Unix timestamp and datetime; auto-detect seconds/ms and show live current time.
UUID Generator
Batch-generate UUID v4 with dashed/lowercase/uppercase formats; copy all at once.
Hash Calculator
Compute MD5, SHA-1, SHA-256, SHA-512 of text or files, all locally with no upload.
Regex Tester
Test regular expressions online with live match highlighting and capture groups.
QR Code Generator
Generate a QR code from text or URL, with adjustable size and error correction; download as PNG.
Text Diff
Compare two texts line by line, marking added, removed and changed lines; great for config and code.
Cron Parser
Parse each field of a cron expression and compute the next 5 execution times.
JWT Decoder
Decode JWT header and payload; show issued time, expiry and remaining validity.
XML Formatter
Format or minify XML, check tag balance, with escape/unescape and structure stats.
JSON to CSV
Convert a JSON array to CSV, Markdown table or SQL; preview and download.
JSON Key Sorter
Recursively sort JSON object keys alphabetically and re-format for easier diff and reading.
Flex Layout Generator
Visually tune flex parameters with live preview and generate standard CSS; one-click copy.
Grid Layout Generator
Generate CSS Grid layout code visually with custom rows/columns and gap; live preview.
URL Parser
Break a URL into protocol, host, path, query params and hash for debugging and sharing.
Barcode Generator
Generate a barcode (CODE128/39, EAN, UPC and more) locally and download as SVG.
UUID v7 & Random MAC
Generate time-sortable UUID v7 and random MAC addresses (locally administered), for distributed IDs and masking.
JSON Path Extractor
Extract a value from JSON by dot path (e.g. user.name, tags.0), with nested objects and arrays.
JSON Diff
Recursively diff two JSONs, listing added/removed/changed field paths and values; great for API diffs.
CSV Column Extractor
Parse CSV and extract chosen columns by name, export a trimmed CSV; processed locally.
Cron Builder
Compose a cron expression field by field with common presets; complements the cron parser.
Batch QR Generator
Generate QR codes for many entries at once, displayed in a grid, each downloadable; rendered locally.
Random Port Generator
Generate random ports (1024-65535) labeled by class (system/registered/dynamic); local only.
Batch Timestamp Converter
Convert many Unix timestamps to dates at once, auto-detecting seconds/ms; local.