Formatters, hashes, tokens, regex and the daily grind of building software. There are 43 of them here, and every one runs inside your browser — no upload, no queue, no account.

Everything in this category

.env to JSON — Convert environment-variable files into JSON, and back again.
Base32 Decoder — Decode Base32 back to text, ignoring padding, spaces and case.
Base32 Encoder — Encode text as Base32 — the encoding used for TOTP secrets and case-insensitive identifiers.
Base64 Decoder — Decode Base64 back to readable text, URL-safe input included.
Base64 Encoder — Encode text to Base64, with a URL-safe option.
Bitwise Calculator — AND, OR, XOR, NOT and shifts on two numbers, shown in every base.
Cron Expression Parser — Explain a cron schedule in plain English and preview the next run times.
CSS Minifier — Strip comments and whitespace from CSS and see the saving.
cURL to Fetch Converter — Paste a curl command and get the equivalent JavaScript fetch call.
File Hash Checker — Verify a download by checking its MD5, SHA-1 and SHA-256 — without uploading it.
Hash Generator — Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
Hex to Text Converter — Turn hexadecimal bytes back into readable text, whatever separators they arrived with.
HMAC Generator — Sign a message with a secret key using HMAC-SHA256, 384 or 512.
HTML Entity Decoder — Turn HTML entities back into the characters they represent.
HTML Entity Encoder — Escape characters so HTML renders them as text instead of markup.
HTML Minifier — Remove comments and collapse whitespace in HTML markup.
HTML to Plain Text — Strip every tag and get just the readable text out of HTML.
IP Subnet Calculator — Work out network, broadcast, mask and usable host range from CIDR notation.
JSON Diff — Compare two JSON documents by structure rather than by line, so formatting never shows up as a change.
JSON Formatter — Pretty-print, validate and tidy JSON with the indentation you prefer.
JSON Minifier — Strip every unnecessary space from JSON and see how much you saved.
JSON to TypeScript — Turn a JSON sample into TypeScript interfaces you can paste straight in.
JSON Validator — Check JSON for errors and get the exact line and column of the problem.
JWT Decoder — Decode a JSON Web Token to read its header and payload — locally, always.
MD5 Hash Generator — Produce the MD5 checksum of any text, instantly.
Number Base Converter — Convert numbers between binary, octal, decimal, hex and any base up to 36.
Query String Parser — Break a URL into its parts and list every query parameter.
Random String Generator — Generate random IDs, tokens and keys from an alphabet you choose.
Regex Escape — Escape a literal string so it can be dropped into a regular expression safely.
Regex Tester — Test a regular expression against sample text and see every match highlighted.
SHA-256 Hash Generator — Produce a SHA-256 hash of any text using the browser’s own crypto.
SQL Formatter — Break a long SQL statement onto readable lines with consistent keywords.
SQL IN Clause Builder — Turn a pasted list into a ready-to-run SQL IN clause.
String Escaper — Escape or unescape text for JSON, JavaScript, CSV and shell arguments.
Text to Hex Converter — Show text as its hexadecimal bytes, in whichever layout you need.
Tool Builder — Write your own DuckyTools tool, watch it run, and download it as one self-contained HTML file.
Unicode Character Inspector — Break text into code points and see what each character really is, byte for byte.
Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates, both ways.
URL Decoder — Turn percent-encoded text back into readable characters.
URL Encoder — Percent-encode text for safe use in URLs and query strings.
User Agent Parser — Read a user-agent string, or inspect your own browser’s.
UUID Generator — Generate cryptographically random version-4 UUIDs in bulk.
XML Formatter — Indent XML into a readable tree and check that it parses.