LateJan

Encode or decode Base64 strings

Encode and decode RFC 3986 URL components, paths, query strings, and form values while preserving repeated parameters

Convert basic HTML entities or decimal and hexadecimal numeric entities, with safe Unicode decoding

Convert JavaScript code-point escapes, UTF-16 escapes, U+ code-point lists, and HTML numeric entities

Calculate chunked local MD5 checksums for text or files, verify GNU/BSD manifests, and export compatible checksum files

Calculate SHA-1 hashes for text, files, or HMAC workflows

Calculate SHA-256/384/512 hashes for text, files, or HMAC workflows

Encrypt text locally with AES-256-GCM, random salt and IV, authenticated metadata, and legacy-payload compatibility

Generate local HMAC test tokens, strictly validate JWT claims, and verify signatures with HMAC, PEM, JWK, or JWKS keys

Locally inspect PEM/DER certificates and public keys, SANs, validity, algorithms, extensions, and fingerprints

Format and validate JSON/JSONC, inspect structure and precision risks, and extract data with JSONPath or JSON Pointer

Validate with the native parser and safely format or minify XML while preserving namespaces, CDATA, DOCTYPE, and mixed-content semantics

Safely format and compact Standard SQL, PostgreSQL, and MySQL while preserving strings, comments, identifiers, and nested queries

Safely format and compact CSS locally while preserving strings, escapes, comments, functions, and nested blocks

Diagnose and format JavaScript, TypeScript, JSX, and TSX with a local parser, plus lexical-safe JavaScript compaction

Batch-generate monotonic UUID v7 or random UUID v4 values and inspect versions, variants, Nil/Max values, and embedded timestamps

Generate secure passwords or readable passphrases with entropy estimates, constraints, and bulk export

Create text, URL, Wi-Fi, email, SMS, contact, and location QR codes locally with capacity checks, error correction, and SVG/PNG export

Reproducibly generate Lorem, Chinese, or developer placeholder content with exact counts, custom vocabulary, and Plain/HTML/Markdown/JSON export

Convert between timestamp and date

Convert alpha-aware HEX, RGB, and HSL colors, preview compositing, and check WCAG text contrast

Convert data storage and bandwidth, time, temperature, and engineering units with scientific notation, precision controls, and full result tables

Convert signed arbitrary-precision integers across binary, octal, decimal, and hex, with fixed-width two’s complement

Validate standard cron expressions and calculate upcoming run times

Convert octal and symbolic permissions with setuid, setgid, and sticky-bit support

Parse POSIX, Windows CMD, and PowerShell cURL commands into safe Fetch, Axios, and Python Requests code

Reliably convert JSON, CSV, and TSV with type inference, nested values, and formula-injection protection

Safely convert JSON, YAML, and TOML locally with depth limits, sorting, and precise parser errors

Generate TypeScript interfaces, Zod schemas, and Go structs from multiple JSON samples

Compare environment variables, find duplicates and missing references, and generate safe examples or redacted copies

Compare, sort, and bump semantic versions, then evaluate npm-style ranges and prerelease rules

Compare dependency versions and section moves, then generate npm, pnpm, or yarn migration commands

Safely compare text by line with case and whitespace options, line statistics, and unified Patch export

Accurately count multilingual graphemes, code points, UTF-8 bytes, words, sentences, reading time, and frequencies

Convert Unicode text and developer identifiers to camel, snake, constant, dot, path, and other naming styles

Debug JavaScript regexes with captures, locations, replacement previews, performance hints, and code export

Inspect zero-width characters, bidirectional controls, mixed scripts, encodings, and normalization risks

Compress image files

Batch resize image dimensions, aspect ratios, and output formats

Convert image to Base64

Look up IP address info

Query DNS records

Parse User-Agent strings

Calculate IPv4/IPv6 ranges, masks, address counts, and subnet containment

Inspect URL structure, query parameters, and risks; remove tracking parameters or redact sensitive values

Strictly analyze response chains, security headers, caching, CORS, and modern __Host-/Partitioned cookie rules

Build requests with API keys, timeouts, query parameters, headers, and bodies, then safely export response-aware code locally