Developer Tools
Format, validate, encode and decode — JSON formatter, JWT decoder, Base64, hash & UUID generators and more.
free tools · no sign-up · works in your browser
Random Number Generator
Generate random numbers within any min–max range, with options for uniqueness and how many to produce.
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text by paragraphs, sentences or words for mockups and designs.
Unix Timestamp Converter
Convert a Unix epoch timestamp into a human-readable date and time.
JWT Decoder
Decode a JSON Web Token to inspect its header and payload claims. Decoding happens locally — your token never leaves the page.
SQL Formatter
Format messy SQL — uppercase keywords, clause-per-line layout and indented conditions — instantly and locally.
Password Generator
Create strong, random passwords with control over length, numbers, symbols and uppercase. Generated locally — never sent anywhere.
Strong Password Generator
Generate hard-to-crack passwords up to 64 characters with full symbol and entropy control.
Random Token / API Key Generator
Generate secure random tokens and API-key-style strings using the browser's crypto API.
UUID Generator
Generate random version-4 UUIDs (GUIDs) one at a time or in bulk, with optional uppercase and no-dashes formats.
Random String Generator
Generate random alphanumeric strings of any length for IDs, tokens and test data.
HTML Minifier
Minify HTML by removing comments and collapsing whitespace between tags.
MD5 Hash Generator
Generate an MD5 hash from any text or string.
JSON to TypeScript Converter
Paste JSON, get a TypeScript interface — field types inferred automatically, nested objects included.
Hash Generator (MD5, SHA-1, SHA-256, SHA-512)
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes of any text instantly in your browser.
CSS Minifier
Minify CSS by stripping comments and whitespace — paste stylesheet, copy the smaller output.
SHA-256 Hash Generator
Generate a secure SHA-256 hash of any input text.
URL Query String Parser
Parse the parameters out of any URL or query string into clean, readable JSON — repeated keys become arrays.
Developer tools: which one fits the job
These tools cover the small tasks that interrupt real work: generating values, inspecting tokens and hashes, and tidying code.
Generating values
Password Generator is the everyday choice for account passwords; Strong Password Generator allows longer passwords with finer control over symbols. For machine credentials, Random Token / API Key Generator produces key-style strings, and UUID Generator gives standard identifiers for database rows or test fixtures. These draw from the browser's cryptographic random source rather than a simple random function.
Inspecting and hashing
JWT Decoder shows a token's header and payload so you can check its claims, such as the expiry time. It does not verify the signature, so a token that decodes cleanly is not proof that it is genuine. Hash Generator (MD5, SHA-1, SHA-256, SHA-512) computes several digests at once. Use SHA-256 for integrity checks and keep MD5 for legacy checksums; neither should be used on its own to store passwords.
Tidying code
SQL Formatter makes a one-line query readable before a review. CSS Minifier strips comments and whitespace for production; keep the readable original in your repository, because minified code is hard to edit.
Everything runs locally in your browser, which matters here: tokens, keys and queries you paste are not sent to a server.