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Frequently chosen utilities for everyday text, code, data, and digital work.

68 toolsready to launch
Generator Cron Expression Generator Generate standard five-field cron expressions for hourly, daily, weekday, weekly, monthly, or custom schedules. Launch tool Developer Cron Expression Parser Split a standard five-field cron expression into minute, hour, day-of-month, month, and weekday explanations. Launch tool Converter cURL to Go net/http Convert one cURL HTTP request into complete Go net/http code with method, headers, inline body, redirect policy, client timeout, response close, and status checks. Launch tool Converter cURL to PHP cURL Convert one cURL HTTP command into PHP cURL code with method, headers, inline body, redirects, millisecond timeout, execution errors, status checks, and cleanup. Launch tool Converter cURL to Python Requests Convert one cURL HTTP request into Python Requests code with explicit method, headers, inline body, redirect behavior, timeout, and HTTP error handling. Launch tool Converter cURL to Fetch Convert one cURL HTTP request into reviewable JavaScript Fetch code with method, headers, inline body, redirect policy, timeout, and status handling. Launch tool Converter JSON Flatten Flatten nested JSON objects and arrays into reversible $-rooted path-value pairs while preserving empty objects, empty arrays, scalar types, and array indexes. Launch tool Developer JSON Path Finder Find JSONPath-style locations for matching keys or values inside deeply nested JSON without manually tracing the structure. Launch tool Converter JSON Unflatten Rebuild nested JSON objects and arrays from a reversible $-rooted flat path map with collision checks, escaped property names, and strict contiguous array indexes. Launch tool Converter JSON to Pydantic Model Generate Pydantic v2 BaseModel classes from JSON with nested models, Python type hints, nullable options, and Field aliases for JSON keys. Launch tool Calculator AI Token Cost Calculator Calculate estimated LLM input and output cost for one request or a batch using editable prices per million tokens and manual or text-estimated usage. Launch tool Developer AI Token Counter Estimate AI prompt tokens with a transparent English, code, or multilingual heuristic, including a planning range, characters, UTF-8 bytes, words, and detected content profile. Launch tool Converter JSON to OpenAI Function Schema Convert representative JSON arguments into an OpenAI function tool definition for the Responses API or Chat Completions. Launch tool Converter JSON to TypeScript Generate a TypeScript interface from representative JSON objects, arrays and primitive values, with a configurable root interface name. Launch tool Converter JSON to Zod Schema Convert representative JSON into a Zod schema with nested objects, arrays, primitive types, null values, and optional strict object handling. Launch tool Validator MCP Schema Validator Validate the core structure of one MCP tool definition, including its name, description, inputSchema, required fields, outputSchema, and annotations. Launch tool Generator MCP Tool Schema Generator Generate a minimal MCP tool definition and Draft 2020-12 inputSchema from a tool name, description, and representative JSON arguments. Launch tool Developer JSON Lines Formatter Validate and normalize JSON Lines or JSONL data as one compact JSON value per line, with strict blank-record detection and an optional final newline. Launch tool Developer JSON Pointer Tester Resolve an RFC 6901 JSON Pointer against an object or array, including escaped slash and tilde characters, and inspect the selected value. Launch tool Generator CORS Header Generator Generate validated CORS response headers for one origin, methods, request headers, exposed response headers, credentials, and preflight caching. Launch tool Developer XPath Tester Evaluate XPath 1.0 expressions against XML and inspect matched nodes or typed string, number, and boolean results. Launch tool Network TXT Record Lookup TXT Record Lookup retrieves published DNS text records and presents SPF, verification, policy, and other TXT values in a readable report. Launch tool Network Port Checker Test whether a TCP port on a public hostname or IP address accepts a connection and review connection timing and resolved destination. Launch tool Network Reverse DNS Lookup Look up the PTR hostname for a public IPv4 or IPv6 address and verify whether the hostname resolves back to the same address. Launch tool Network SSL Certificate Checker Inspect a public website TLS certificate, validity period, issuer, subject, SAN hostnames, fingerprint, and trust verification. Launch tool Network HTTP Header Checker Inspect HTTP response headers, caching, content metadata, CORS, and common security headers for a public URL. Launch tool Network DNS Lookup Look up DNS records for a domain, including A, AAAA, MX, TXT, NS, CNAME, SOA, and CAA records. Launch tool Seo Redirect Chain Checker Trace HTTP redirects, inspect status codes, detect loops, and identify unnecessary redirect hops. Launch tool Seo Robots.txt Tester & Validator Validate robots.txt syntax, inspect crawler directives, and test whether a URL is allowed for a selected user-agent. Launch tool Seo Sitemap Validator Validate XML sitemap syntax, structure, URLs, duplicates, namespaces, and optional metadata. Launch tool Seo Canonical URL Checker Check a canonical URL for syntax, protocol, fragments, query parameters, normalization issues, and page alignment. Launch tool Seo Hreflang Generator Generate a reciprocal hreflang cluster as HTML link tags and a complete same-site XML sitemap, with normalized locales and optional x-default. Launch tool Generator CSP Policy Builder Build a Content-Security-Policy header with presets, source directives, Report-Only mode, security warnings, and copy-ready HTTP, nginx, Apache and meta-tag output. Launch tool Developer Regex Tester PRO Test regular expressions with detailed matches, named groups, offsets, line and column positions, execution timing, and highlighted previews. Launch tool Generator Regex Builder Build practical regular expressions from common matching requirements. Launch tool Developer Regex Extractor Extract all regex matches and capture groups from text. Launch tool Developer Regex Replace Replace regex matches with text or capture-group references. Launch tool Developer JSON Viewer View JSON online as a readable tree, pretty-printed document, or flattened JSON path list with value types and depth controls. Launch tool Encode Decode Base64 Decoder Decode standard Base64 online to UTF-8 text or inspect decoded binary bytes as hexadecimal. Launch tool Encode Decode Certificate Decoder Decode one X.509 PEM certificate and inspect subject, issuer, validity, SAN entries, fingerprints, serial number, signature, and key usage. Launch tool Encode Decode PEM Formatter Format PEM certificates and keys, validate matching boundary labels, and wrap Base64 content into standard 64-character lines. Launch tool Generator Password Generator Advanced Generate 1–100 secure random passwords with 8–256 characters, selectable character sets, similar-character removal, and custom exclusions. Launch tool Validator UUID Validator Validate canonical UUID syntax, identify versions 1–8, recognize Nil and Max UUIDs, report the variant, and explain format failures. Launch tool Encode Decode Checksum Calculator Calculate CRC32, MD5, SHA-1, SHA-256, SHA-384, or SHA-512 checksums from exact text and compare deterministic outputs across systems. Launch tool Validator Password Strength Checker Check password strength using length, character variety, repetition, sequences, and common-pattern signals while keeping the result easy to understand. Launch tool Validator BCrypt Verify Verify a plain-text password against a BCrypt hash safely, understand match results, and troubleshoot invalid hash formats without attempting to decode the hash. Launch tool Generator BCrypt Hash Generator Generate a salted 60-character BCrypt password hash, choose cost 4–15, inspect its parts, measure runtime, and verify it immediately. Launch tool Generator SHA512 Generator & SHA256 Comparison Generate a 128-character SHA-512 digest for long text or hexadecimal key material and compare it with SHA-256 calculated from the same bytes. Launch tool Generator SHA256 File Checksum Generator Calculate a SHA-256 checksum for any local file or exact text, then compare it with a published 64-character digest without uploading the file. Launch tool Validator JSON Schema Validator Validate JSON data against a practical JSON Schema subset and receive errors with exact data paths for types, required fields, arrays, strings and numbers. Launch tool Validator OpenAPI Validator Validate the required structure of OpenAPI 3.0 and 3.1 documents supplied as JSON or YAML. Launch tool Validator CSV Validator Validate UTF-8 CSV structure, delimiter choice, quoting, header names and consistent column counts before import or conversion. Launch tool Network URL Parser Split an absolute URL into scheme, host, port, user information, path, query parameters, and fragment. Launch tool Network HTTP Status Code Lookup Look up common HTTP response codes and use detailed guides for 301, 302, 401, 403, 404, 429, 500, 502, and 503 errors. Launch tool Network Query String Parser Parse a complete URL or raw query string into structured, readable JSON without changing the original input. Launch tool Converter Timestamp Converter Convert Unix seconds, milliseconds, microseconds and date-time text to UTC, ISO 8601 and selected timezones. Launch tool Converter JSON to YAML Convert valid JSON objects, arrays and scalar values to readable YAML while preserving nesting, strings, numbers, booleans, null and Unicode text. Launch tool Validator YAML Validator Check a practical YAML subset for indentation, mappings, sequences, duplicate keys, quotes and scalar syntax, with explicit unsupported-feature errors. Launch tool Developer CSV to JSON Convert UTF-8 CSV, TSV, semicolon or pipe-delimited rows to a formatted JSON array with header controls, delimiter detection and empty-value handling. Launch tool Generator UUID Generator Generate cryptographically secure UUID v4 or time-ordered UUID v7 identifiers online, one at a time or in bulk, with canonical, uppercase, brace and compact output formats. Launch tool Validator XML Validator Check whether XML is well-formed and locate syntax errors such as mismatched tags, invalid nesting, broken attributes and multiple root elements. Launch tool Validator JSON Validator Validate JSON syntax online and inspect the document root type, nesting depth, node count, object keys, arrays, objects and scalar values. Launch tool Converter JSON to CSV Convert a non-empty JSON array of objects to CSV with selectable delimiter, header and line-ending options, nested JSON serialization and spreadsheet formula protection. Launch tool Encode Decode JWT Decoder Decode JWT header and payload online, inspect alg/type and time claims, and see expiration status without pretending to verify the signature. Launch tool Developer JSON Formatter Format, beautify or minify JSON online with 2-space, 4-space or tab indentation, optional recursive key sorting, validation, and copy-ready output. Launch tool Encode Decode Base64 Encoder Encode UTF-8 text to standard Base64 online with optional 64- or 76-character line wrapping and canonical padding. Launch tool Encode Decode URL Decoder Decode valid percent-encoded UTF-8 text while preserving literal plus signs for accurate URL-component inspection. Launch tool Encode Decode URL Encoder Percent-encode UTF-8 text for use as one URL component while preserving JavaScript encodeURIComponent-safe characters. Launch tool
Useful answers

Questions people ask before using the tools

Clear answers about access, limits, privacy, and choosing the right workflow.

Do I need to install anything to use Trexmi tools?

No installation is required. Open a tool in your browser, provide the requested input, and process the result directly on the page. This makes the tools practical on shared computers and mobile devices as well as on a regular desktop.

Can I use these tools without creating an account?

Most tools can be opened and tested without an account. Registration is useful when you need higher free limits, saved preferences, favorites, or account-based features. Trexmi PRO is intended for larger and more frequent workloads.

How do I find the right tool quickly?

Use the live filter above the tool grid. It searches tool names, descriptions, keywords, and categories immediately. You can then sort the visible results by recommendation, newest, alphabetical order, featured status, or popularity.

Are the tools suitable for professional work?

The tools are designed around focused, repeatable tasks rather than large complicated workflows. They are useful for content preparation, development, data cleanup, office work, quality checks, and other everyday operations where speed and predictable output matter.

What happens when a task is larger than the free limit?

Trexmi shows the relevant limit only when it affects the task. You can split the input into smaller runs, create a free account for higher allowances where available, or use PRO for larger supported inputs and more frequent usage.

Will more trexmi tools be added?

Yes. Trexmi is structured as an expanding tool platform. New utilities can be added to existing categories, while new categories appear automatically in the directory when they contain public tools.