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What Techie Utils does with what you type: 247 of 273 tools run in your browser, what the rest send, and what is stored or counted.

Tools

Encoders & Decoders

  • Base64 — Encode or decode UTF-8 text and URL-safe Base64
  • Base32 — Encode or decode Base32 in the RFC 4648, extended hex and Crockford alphabets
  • Base58 — Encode or decode Base58, and verify the Base58Check checksum an address carries
  • URL Encoder — Percent-encode components or whole URLs
  • HTML Entities — Escape and unescape HTML entities
  • JWT — Read, verify and sign JSON Web Tokens
  • Punycode — Convert internationalised domain names to and from their ASCII form
  • Unicode Converter — Escape, unescape and inspect code points
  • Unicode Inspector — Analyse every character: category, script, block and encoding
  • Number Base Converter — Binary, octal, decimal and hexadecimal, with the bits explained
  • Hex and Text Converter — Text to hexadecimal bytes and back, with a dump
  • Gzip Compressor and Decompressor — Compress and expand gzip, zlib and raw deflate

Structured Formats

  • Structure Converter — Convert between JSON, XML, YAML, TOML, TOON, HCL and CSV
  • String Escaper — Escape a JSON, XML, YAML, TOML or TOON document for embedding, or read one back
  • Structure Formatter — Pretty-print JSON, XML, YAML, TOML, TOON or HCL with a chosen indent
  • Structure Validator — Check JSON, XML, YAML, TOML, TOON or HCL and report structural problems
  • Tree Viewer — Explore JSON, XML, YAML, TOML, TOON or HCL as a collapsible tree
  • Code Generator — Turn a JSON, YAML, XML or other document into TypeScript, Go, C#, Python, Rust and more
  • Schema Generator — Write a JSON Schema, XSD, Avro schema or .proto from a document you already have
  • Schema Validator — Check a document against a JSON Schema, .proto, Avro schema, XSD or RELAX NG
  • Table Viewer — Show the records in a JSON, XML, YAML, TOML or TOON document as a table
  • Structure Compare — Diff two JSON, XML, YAML, TOML, TOON or HCL documents by path
  • Structure Repair — Fix broken JSON, YAML, XML, TOML, TOON, INI, .env, .properties and HCL, listing every repair
  • Structure Minifier — Strip formatting from JSON, XML, YAML, TOML or TOON
  • Path Finder — Select nodes with JSONPath or XPath
  • Protobuf & Avro Decoder — Read protobuf wire bytes and Avro container files without their schema
  • Expression Evaluator — Reduce a JSONPath or XPath match to a single answer

Security & Cryptography

  • Hash Generator — SHA-2, SHA-3, BLAKE and legacy digests, in any encoding
  • MD5 Generator — MD5 digests, with a plain account of what they are still good for
  • HMAC Generator — Keyed message authentication codes
  • Key Derivation — Stretch a passphrase into key material with PBKDF2, scrypt or Argon2id
  • Password Generator — Strong random passwords with an entropy estimate
  • Password Strength — Judge a password by what an attacker would actually try
  • JWK Generator — A JSON Web Key for a JOSE algorithm, with its key set and thumbprint id
  • Key Pair Generator — RSA and elliptic-curve key pairs, generated in this tab and never sent
  • TOTP / HOTP Generator — Two-factor codes, the QR code to enrol with, and why one did not match
  • Text Encryption — AES-256-GCM with a PBKDF2 passphrase
  • Bcrypt Generator — Hash a password with bcrypt, verify one against a hash, or read what a hash is made of

SSL & Certificates

Network & DNS

  • DNS Lookup — Resolve A, AAAA, MX, TXT, NS, CNAME, SOA and CAA records
  • IP Lookup — Resolve addresses and reverse DNS for a host or IP
  • Port Checker — Test whether TCP ports accept connections
  • Nmap Port Scanner — Scan a host's common TCP ports, Nmap style, and see what each open service says it is
  • Ping (TCP) — Measure connection latency with repeated TCP probes
  • What Is My IP — Your public address, and what a browser reveals about you
  • WHOIS — Registry records for a domain, an IP address or an AS number
  • DNS Propagation Checker — The same name asked of resolvers worldwide, and of the zone's own servers
  • Email Authentication Checker — SPF, DKIM, DMARC and MX for a domain, read together
  • Email Header Analyzer — The delivery path, the authentication results, and what a forgery looks like
  • DKIM Lookup — A domain's DKIM keys, for a selector or by trying the common ones, and whether each is worth anything
  • DMARC Lookup — A domain's DMARC policy, and what it actually asks receivers to do
  • Reverse DNS Lookup — The PTR record for an address, and whether it confirms itself
  • IP Blacklist Checker — Whether an address is on the blocklists that actually stop mail
  • Reverse IP Lookup — What an address says about itself: its name, its certificate, its network
  • Traceroute — Every hop between this server and a host, with the time each one took
  • Broadband Speed Test — Download, upload, latency and jitter, measured from this tab
  • HTTP Headers — Grade a site's security headers from A+ to F, see every response header, and get the fix for your server
  • Redirect Checker — Follow a URL's redirects hop by hop, and flag loops, downgrades and temporary redirects doing a permanent job
  • IP Address Converter — Write an IPv4 or IPv6 address as an integer, hex, binary, expanded or mapped form, and see what kind it is
  • MAC Address Lookup — Find the manufacturer behind a MAC address, and see what kind of address it is
  • MAC to IP Converter — Build the IPv6 address a MAC forms with SLAAC, recover the MAC from one, or find a MAC's IP in an ARP table
  • IP to MAC Lookup — Find the MAC address behind an IP: computed for multicast and EUI-64 addresses, or read from an ARP table
  • DNSSEC Checker — Whether a domain's DNSSEC validates, and if not, whether it is the DS, a key, an algorithm or an expired signature

Web Development

Text Tools

  • Markdown Viewer — Read a Markdown file the way it is meant to look, with its contents beside it
  • Markdown to HTML — Convert Markdown to HTML you can paste somewhere, with the rendered page beside it
  • Case Converter — Switch between sentence, camel, snake and other cases
  • Word Counter — Count words, characters, sentences and reading time
  • Text Comparison — Line-by-line diff of two blocks of text
  • Duplicate Remover — Remove, isolate or list duplicate lines
  • Whitespace Remover — Trim, collapse and normalise whitespace
  • Sort Lines — Sort lines alphabetically, naturally, by number or length, reverse them, or shuffle them

Generators

  • UUID Generator — UUID v1 to v7 — generate any version, or read what one encodes
  • ULID / CUID Generator — Sortable, collision-resistant identifiers — and the timestamp inside one
  • Nano ID Generator — Short, URL-safe random identifiers — and what the length actually buys
  • KSUID Generator — Sortable 27-character identifiers with a second of time and 128 bits of randomness
  • TypeID Generator — Type-prefixed identifiers over UUID v7, readable and still a UUID underneath
  • ObjectID Generator — MongoDB's twelve bytes — a timestamp, a process value and a counter
  • Barcode Generator — Draw QR, Data Matrix, Code 128, EAN and more as SVG
  • QR Code Generator — Create scannable QR codes as SVG
  • UPI QR Code Generator — Make a UPI payment QR code that any UPI app can scan to pay you
  • Diagram Studio — Draw architecture, sequence, ER, C4, network and nine other diagrams by dragging shapes and connecting them
  • Random String — Random identifiers from a chosen alphabet
  • Lorem Ipsum — Placeholder paragraphs, sentences or words
  • Fake Data — Synthetic people and companies as JSON, CSV or SQL
  • Random Number Generator — Draw uniformly random integers or decimals in a range, with or without repeats

Date & Time

Images & Files

Colors & Design

Calculators

Analyzers

  • Log Analyzer — Summarise a log: rates, errors, slowest paths and busiest clients
  • HAR Analyzer — A network recording as a waterfall: what was slow, heavy, uncached or failing
  • IDN Homograph Detector — Check whether a domain name is imitating another one
  • Phishing URL Checker — Where a link really ends up, how old the domain is, and which tricks it uses
  • Injection Filter Tester — Standard probes per context, and whether your escaping survived them
  • Stack Trace Analyzer — Read a stack trace or crash in any common language: the cause, your frames, and what it usually means

SEO & Meta