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Developer tools
Explore developer tools and utilities.
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Tools in this category
JSON Formatter and ValidatorFormat, validate, and minify JSON with readable syntax errors.CSV to JSON ConverterConvert CSV with a header row into JSON objects in your browser.JSON MinifierMinify valid JSON by removing insignificant whitespace.Number Base ConverterConvert integers between binary, octal, decimal, and hexadecimal.Regex TesterTest a JavaScript regular expression against text and list matching substrings.Markdown to HTML (Basic)Convert basic Markdown headings, emphasis, lists, and paragraphs to HTML. Output is intended for inspection; review before publishing.Base64 Encoder & Decoder | Real-Time Base64 Converter OnlineEncode text or a file to Base64 and decode it back, in your browser. Auto names the direction it chose and why. Standard and URL-safe, padding, line wrap.Code Diff Checker - Compare Code Difference Online, No UploadCompare two blocks of code and see every difference highlighted line by line. Side-by-side or inline, ignore whitespace or case. Nothing is ever uploaded.Cron Expression Explainer - Real-Time Cron Schedule VisualizerRead any cron expression in plain English and see its next five real runs. Handles steps, names like MON-FRI, and @daily. Runs in your browser, nothing uploaded.CSS Formatter - Beautify & IndentBeautify and unminify CSS in your browser — one declaration per line, consistent spacing, your choice of indentation. Nothing uploaded, works offline. Free.CSS Minifier - Compress CSSMinify CSS in your browser — strip comments and whitespace and tighten syntax to shrink the stylesheet, with the size saved. Nothing uploaded, works offline. Free.XML Batch Generator from Excel to FoldersAutomate bulk XML file creation from Excel form IDs. Upload XLSX and XML templates to generate structured folders and files entirely client-side for developers.File Hash Generator - MD5, SHA-256, SHA-512 ChecksumGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes for any file instantly and securely in your browser. No data leaves your device. Perfect for integrity verification.JSON Auto Fill Generator | Smart Mock Data PopulatorFill a JSON skeleton with sample data in your browser. Values are chosen from your key names, and your key order, big integers and literals come back unchanged.Hash Generator (SHA-256, MD5, SHA-512) | Developer ToolsHash text or a file to MD5, SHA-1, SHA-256, SHA-384 and SHA-512 at once, in hex or Base64. Paste a published digest to check it. Runs in your browser.HMAC Generator Tool | Compute HMAC-SHA256, SHA512, MD5 OnlineCompute HMAC-SHA256, SHA-512, SHA-384, SHA-1 and MD5 from a message and a secret key, in hex or Base64, and check a signature you were sent. Runs in your browser.HTML Formatter - Beautify & IndentBeautify and indent messy or minified HTML in your browser — clean nesting, your choice of indentation. Nothing uploaded, works offline. Free, no signup.HTML Minifier - Compress HTMLMinify HTML in your browser — remove comments and collapse whitespace to shrink the file, keeping it rendering the same. See the size saved. Nothing uploaded.HTML to Markdown ConverterConvert HTML to clean Markdown in your browser — headings, links, lists, code, and tables mapped to Markdown. Nothing uploaded, works offline. Free, no signup.JavaScript Formatter - Beautify JSBeautify and unminify JavaScript in your browser — consistent indentation and spacing, your choice of style. Nothing uploaded, works offline. Free, no signup.JavaScript Minifier - Compress JSMinify JavaScript in your browser — strip comments and whitespace to shrink the file while preserving behavior. See the size saved. Nothing uploaded, works offline.JSON to CSV Converter - PrivateConvert JSON to CSV in your browser — object keys become the header, each object a row. Flattens nested data, handles Excel delimiters. Nothing uploaded, offline.JSON Validator - Check & Repair JSONCheck JSON against RFC 8259 in your browser. Every problem with the line and column it is on, duplicate keys flagged, and a repaired copy you can take away. Nothing is uploaded.JWT Decoder - Decode JSON Web TokensDecode a JSON Web Token's header, payload, and expiry in your browser. Nothing is uploaded. Note: this reads tokens, it does not verify signatures.Lorem Ipsum Generator - Placeholder Text for DevelopersGenerate high-quality placeholder text instantly with the Randomly.online Lorem Ipsum Generator. Customize paragraphs, sentences, or words for your design layouts.Advanced Password Generator | Secure, Random & CustomizableGenerate highly secure, customizable passwords and passphrases instantly. A client-side, privacy-focused tool with live entropy analysis, bulk generation, and advanced security rules.SQL Formatter - Beautify QueriesBeautify and indent SQL in your browser — clauses on their own lines, tidy keyword case. It never runs your query. Nothing uploaded, works offline. Free.SQL Playground - Practice SQL Online in Your BrowserFree online SQL playground with sample databases. Run real SQL queries in your browser using SQLite. Nothing is uploaded - queries run entirely on your device.Text to Binary Converter - Instant Binary TranslatorConvert text to binary and binary to text instantly with our developer-focused tool. Secure, real-time conversion with character inspection and offline support.Unix Timestamp Converter & Epoch Time CalculatorConvert a Unix timestamp to a date or back, in any IANA time zone. Seconds, milliseconds, microseconds and nanoseconds, detected from the number.Online UUID Generator - Fast, Secure, RFC-4122 CompliantGenerate UUID v4, v7, v1, v3 and v5 in your browser, one or 10,000. Paste one back to read its version, variant and timestamp. Nothing is uploaded.XML Formatter - Beautify & CheckBeautify and check XML in your browser — indent by nesting, catch parse errors, explore a tree. Nothing uploaded, works offline. Free, no signup.