Developer & Data

Clean header-based standard comma-separated CSV locally with explicit rules and an auditable result summary.

Convert between CSV and top-level flat JSON arrays with header validation, error hints, and local copy.

Compare two standard JSON values locally in your browser, ignoring object key order while keeping array order significant.

Format, minify, and validate JSON, with TypeScript, Go, Java, Python, and C# code generation.

Convert JSON keys between 9 naming styles: camelCase, snake_case, PascalCase, kebab-case & more with depth control

Validate JSON data against JSON Schema with field paths, error reasons, and validity status.

Convert between JSON and YAML with indentation control, multi-document YAML, and syntax error hints.

Validate single or multi-document YAML locally in the browser and only emit normalized YAML for a controlled safe subset.

Convert XML and JSON text both ways locally with a fixed mapping profile while explicitly blocking namespaces, mixed content, and unsafe structures.

Parse a single IPv4 CIDR locally in your browser and compute the normalized subnet, mask, wildcard mask, network, broadcast, and usable endpoint range.

Batch-aggregate IPv4 / IPv6 CIDRs, IP ranges, and single IPs locally in your browser. Auto-buckets v4/v6, merges adjacent and containing blocks into the minimum CIDR list. Supports set subtraction (A − B), 8 export formats (CIDR / range / netmask / wildcard / CSV / JSON / nginx / iptables), line-level error diagnostics, and normalization warnings. Accepts flexible delimiters including newline, comma, full-width, space, tab, and semicolon.

Parse IPv6 addresses locally in your browser: canonicalize, classify, CIDR compute, equal-length subnet split, EUI-64 round-trip, and batch validation. Includes Teredo decoding and .ip6.arpa reverse DNS generation.

Parse cron expressions into human readable schedules to reduce timer configuration errors.

Parse cURL commands into method, URL, headers, and body for API tooling reuse.

Parse raw HTTP header text into key-value structures for debugging.

Look up HTTP status codes with descriptions, usage scenarios, confusion pairs, and related codes

Browse magic bytes signatures for common file formats with search, category filters, and drag-and-drop file identification

Test regex patterns with match highlighting, capture groups, replace preview, and code snippets.

Convert regex patterns into railroad diagrams with bilingual structural explanation, common presets, and SVG/PNG export

Check whether versions satisfy semver ranges to assist dependency upgrades.

Parse full URLs or raw query strings locally in your browser, preserve duplicate keys, empty values, and flag params, then rebuild the output explicitly.

Parse user agent strings and identify browser, operating system, and device details.

Calculate Shannon entropy with log₂/ln/log₁₀ bases, normalized entropy, randomness gauge, and per-character contribution breakdown

Capture and display keyboard event properties in real time, including key, code, keyCode, modifiers, and composition events

Look up MIME types and file extensions with bidirectional search, category filters, and one-click copy

Look up 140+ common network ports with category and protocol filters, security risk annotations, and one-click copy

Convert between geohashes and coordinates locally in your browser with smart detection, precision 1-12, bbox details, neighbour cells, parent prefixes, GeoJSON/WKT output, and batch conversion.

Visualize sign-magnitude, ones' complement and two's complement for integers with 8/16/32/64-bit widths, dec/bin/hex I/O, step-by-step derivation, color-coded bit grid and boundary presets

Encode and decode text with standard and URL-safe Base64, including UTF-8 and Unicode support.

CRC-8/16/32/64 Checksum Calculator with 24 algorithms, text/hex/file input

Compute XOR/BCC and Sum8/Sum16-BE/LE checksums with text/hex/Base64 input, configurable init value, byte range, step-by-step trace, verification and batch mode

Compute ISO 1155 LRC (Longitudinal Redundancy Check) with text/hex/Base64 input, step-by-step trace, verification and batch mode for Modbus ASCII and serial protocol debugging

Convert UTF-8 text, hex, Base32, Base32hex, Base64, and Base64url locally in your browser with strict rules.

Convert conservative .env, INI, and Java properties text locally in your browser and block unsafe mappings explicitly.

Search common HTML entities and copy named entities, decimal refs, hex refs, CSS escapes, and JS escapes

Convert between Unix timestamps and dates

Look up code points, encodings & names for any character

Translate between text and Morse code with audio playback, signal visualization, and reference chart

Caesar and Vigenère cipher encrypt/decrypt with brute-force, crib filtering, chi-squared ranking, frequency analysis, IC, Kasiski auto-crack, and Tabula Recta

ROT47 cipher for ASCII printable characters with 0-93 shift, self-inverse detection, brute-force attack, and ASCII frequency analysis

Escape & unescape strings locally for JSON, JavaScript, Java, HTML, XML, SQL, and CSV

Percent-encode and decode URL parameters or text with Chinese, emoji, and special character support.

Client-side HTTP Basic Auth encoder and decoder with real-time Base64, Authorization header, curl, and fetch snippets — supports UTF-8 and reverse decoding

Client-side Punycode / IDN encoder and decoder with auto-direction, full-URL and email support, per-label breakdown, homograph advisory, and UTS #46 nontransitional processing

Convert text to ASCII art with 300+ fonts, layout controls, code comment wrapping, and one-click export

Visually calculate Linux/Unix file permissions with setuid/setgid/sticky special bits, common presets, and 3-way octal↔symbolic↔checkbox sync

Nano ID & ULID unified generator with 6 alphabet presets, collision probability calculator, ULID timestamp decode, UUID↔ULID conversion, Client-side computation

Generate robots.txt rules, sitemap declarations, and common crawler directives.

Generate static badges with local preview, then copy Shields-compatible URLs, Markdown, HTML, and SVG

Generate XML sitemaps locally from either full URLs or same-site paths, with optional changefreq, priority, and lastmod fields, then copy or download the result.

Generate UUID v4 in batch with format options

Generate random MAC addresses in batch with four formats, case toggle, unicast/multicast & UAA/LAA control, custom OUI prefix, and vendor presets

Client-side computation batch sequence generator with Simple mode (prefix+start+step+padding+suffix), DSL templates ({n:04} {ALPHA} {ROMAN} {cn} {CN} {date:YYYY-MM-DD} {rand:6}), Date mode, 9 output formats (TXT/CSV/JSON/TSV/SQL/Markdown), BigInt big-number support, fixed-point decimals, Chinese numerals & financial uppercase, Excel column letters, Roman numerals, shuffle, presets, up to 100k rows, mobile-first UI

Convert XML and JSON text both ways locally with a fixed mapping profile while explicitly blocking namespaces, mixed content, and unsafe structures.

Beautify and minify JavaScript, CSS, HTML, and shell code with configurable indentation

Turn code snippets into beautiful syntax-highlighted images with theme switching and PNG export

Auto format SQL statements with indentation and line breaks for better readability.

Pretty print or minify XML content to inspect structure and troubleshoot parsing issues.