Developer Tools
Everyday utilities for developers. Paste your data, get a result instantly, and nothing is sent to a server.
28 free tools
JSON FormatterFormat, beautify, validate and minify JSON online for free. Find syntax errors with exact line numbers. Runs in your browser, your data is never uploaded.Base64 EncodeEncode text or files to Base64 online for free. Full UTF-8 support, URL-safe option and data URI output. Runs in your browser.Base64 DecodeDecode Base64 to text online for free. Supports UTF-8, URL-safe Base64 and data URIs, and lets you download decoded files.Password GeneratorGenerate strong, random passwords online for free. Choose length, symbols, numbers and letters. Generated securely in your browser and never sent anywhere.Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files online for free. Verify file checksums. Runs in your browser.URL EncodeURL-encode text online for free. Convert spaces and special characters to percent-encoding (%20) for query strings and links. Full UTF-8 support.URL DecodeDecode percent-encoded URLs and query strings online for free. Turn %20 and other escapes back into readable text, with full UTF-8 support.HEX to RGBConvert HEX color codes to RGB online for free, with a live preview. Also shows HSL and CSS values for every color.RGB to HEXConvert RGB color codes to HEX online for free, with a live preview. Also shows HSL and CSS values for every color.CSV to JSONConvert CSV to JSON online for free. Uses the header row as keys, detects numbers, supports comma, semicolon and tab separators. Runs in your browser.JSON to CSVConvert JSON to CSV online for free. Turns an array of objects into a spreadsheet-ready CSV with headers. Nested objects are flattened. No upload.XML FormatterFormat, beautify, validate and minify XML online for free. Get clear error messages for invalid XML. Works with sitemaps, RSS feeds, SVG and config files.Unix Timestamp ConverterConvert Unix timestamps (epoch seconds or milliseconds) to human-readable dates and back. Shows UTC, your local time and ISO 8601. Live current timestamp.UUID GeneratorGenerate UUIDs (GUIDs) online: random version 4 or time-ordered version 7. Bulk generate up to 1,000, with uppercase, no-hyphen and braces options.JWT DecoderDecode JWT tokens to see the header and payload, check expiry dates, and verify HS256/HS384/HS512 signatures. Runs locally: your token is never sent.Regex TesterTest regular expressions online with live match highlighting, capture groups, named groups and flags (g, i, m, s, u). Includes a replace preview.Number Base ConverterConvert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36. Supports very large numbers. Instant results as you type.JSON to YAMLConvert JSON to YAML online for free. Clean, readable YAML for Kubernetes, Docker Compose, GitHub Actions and config files. Validates your JSON.YAML to JSONConvert YAML to JSON online for free. Validates YAML with line numbers for errors. Works with Kubernetes manifests, Docker Compose and CI configs.HTML Entity Encoder / DecoderEncode special characters as HTML entities (< & ") or decode entities back to text. Optional encoding of all non-ASCII characters.Password Strength CheckerCheck how strong your password is and how long it would take to crack. Detects common passwords, keyboard patterns and dates. Runs offline in your browser.JSON to XMLConvert JSON to XML online for free. Arrays become repeated elements, "@" keys become attributes. Pretty-printed, valid XML output. Runs in your browser.XML to JSONConvert XML to JSON online for free. Attributes, repeated elements and text are mapped predictably. Handles SOAP, RSS and config files. No upload.Cron Expression GeneratorBuild and understand cron expressions online. Plain-English explanation, next run times, and presets for hourly, daily, weekly and monthly jobs.URL ParserParse any URL into protocol, host, port, path, query parameters and fragment. Decode and edit query parameters, then rebuild the URL. Free and instant.CSV ViewerOpen CSV files online and view them as a sortable, searchable table. Auto-detects commas, semicolons and tabs. No Excel needed, and nothing is uploaded.SQL FormatterFormat and beautify SQL queries online. Supports MySQL, PostgreSQL, SQL Server, SQLite, Oracle and BigQuery. Uppercase keywords, indentation and minify.HTML to MarkdownConvert HTML to clean Markdown online. Headings, links, images, lists, tables, code blocks and bold/italic are converted. Paste HTML or a rich-text copy.