Developer tools.
Zero friction.
Format JSON, generate UUIDs, decode tokens, convert Base64 and compute hashes. Fast, practical utilities running right in your browser.
Explore tools
48 tools available
Generators
UUID v4 Generator →
Generate secure random UUID v4 identifiers instantly in your browser. No sign-up, no server upload, and one-click copy.
GeneratorsUUID v1 Generator →
Generate Gregorian timestamp UUID v1 values locally with randomized node data.
GeneratorsUUID v3 Generator →
Generate deterministic UUID v3 identifiers from DNS, URL, OID, X.500 or custom namespaces.
GeneratorsUUID v5 Generator →
Generate repeatable UUID v5 identifiers using SHA-1 and a namespace plus name.
GeneratorsUUID v6 Generator →
Generate reordered Gregorian time-based UUID version 6 identifiers in your browser.
GeneratorsUUID v7 Generator →
Generate Unix timestamp-based version 7 UUIDs with secure random data and export them in bulk.
GeneratorsUUID v8 Generator →
Generate UUID version 8 samples using random custom bits and correct RFC variant bits.
GeneratorsNil UUID →
Copy the standard all-zero Nil UUID constant in canonical, GUID or URN form.
GeneratorsMax UUID →
Copy the standard all-one Max UUID constant for boundary testing and examples.
GeneratorsUUID Validator & Decoder →
Validate UUIDs and GUIDs, inspect hexadecimal and decimal forms, version, variant and timestamps.
GeneratorsBulk UUID Generator →
Generate, copy and export up to 1,000 UUIDs at once with custom output format, quotes and separators.
GeneratorsGUID Generator →
Create uppercase GUIDs with braces for .NET, SQL Server, Windows and C# code.
GeneratorsULID Generator →
Generate 26-character ULIDs locally with timestamp and secure random bits, bulk export and one-click copy.
GeneratorsNano ID Generator →
Generate secure URL-safe Nano ID-style identifiers with configurable character length and bulk export.
GeneratorsRandom Hex Generator →
Generate secure random hexadecimal bytes online with uppercase option, batch generation and export.
GeneratorsRandom Number Generator →
Generate uniformly sampled random integers from a chosen safe-integer range using Web Crypto, with batch and JSON export.
GeneratorsQR Code Generator →
Generate QR codes for URLs or text privately in your browser. Customize size, margin, correction level, foreground and background; export PNG or SVG.
GeneratorsLorem Ipsum Generator →
Generate customizable Lorem Ipsum placeholder text by paragraphs, sentences or words. Copy it or download as a TXT file, entirely offline in your browser.
GeneratorsFake Data Generator →
Generate synthetic names, reserved-domain emails, usernames, sample locations and dates in JSON or CSV. Choose fields and export locally.
GeneratorsRandom Color Generator →
Generate random colors and palettes, preview swatches, inspect WCAG contrast ratios, copy HEX/RGB/HSL and export CSS or JSON.
Data & JSON
JSON Formatter →
Format, validate and minify JSON locally in your browser. Helpful parse errors, indentation and one-click copying.
Data & JSONJSON Minifier →
Minify valid JSON in your browser, remove unnecessary whitespace, copy or export compact JSON without sending data to a server.
Data & JSONJSON Tree Viewer →
Explore nested JSON interactively as an expandable tree with objects, arrays, primitives and path labels, entirely in your browser.
Data & JSONJSON Diff Checker →
Compare two JSON documents by values, see added, removed and changed paths, and export differences locally.
Data & JSONJSONPath Tester →
Test common JSONPath expressions against JSON data in your browser. Supports properties, array indices, wildcards and recursive descendant search.
Data & JSONJSON ↔ YAML Converter →
Convert JSON to YAML and YAML to JSON in the browser with validation, clear errors and download options. No server upload.
Data & JSONJSON ↔ CSV Converter →
Convert arrays of JSON objects to CSV and CSV with headers back to JSON, with quoting, delimiter options and downloads.
Data & JSONJSON to TypeScript →
Generate a TypeScript type alias from JSON examples with nested objects, arrays and union types, locally and privately.
Data & JSONJSON Schema Validator →
Validate JSON data against a draft 2020-12 JSON Schema entirely in your browser, with detailed property errors and no remote input upload.
Data & JSONXML Formatter & Validator →
Validate XML syntax, format nested tags or compact formatting whitespace locally with browser DOMParser and XMLSerializer.
Data & JSONXML ↔ JSON Converter →
Convert XML to a practical JSON representation and convert JSON root objects back to XML, with explicit attribute and text mapping.
Data & JSONSQL Formatter →
Format and indent SQL queries online with PostgreSQL, MySQL, SQLite, SQL Server and Oracle dialect options. All processing is local.
Data & JSONCSV Table Viewer →
View CSV data as a searchable, sortable table with pagination and JSON export. Supports quoted fields and several delimiters.
Data & JSONMarkdown Preview →
Preview Markdown locally with headings, task lists, tables, links and code blocks. Copy or download Markdown without uploading your text.
Data & JSONYAML Validator →
Validate YAML 1.2 with duplicate-key checks, detailed line errors, and formatted YAML output entirely in your browser.
Encoding
Base64 Encoder / Decoder →
Encode and decode UTF-8 text with Base64 in your browser. Unicode-ready and never sent to a server.
EncodingURL Encoder & Decoder →
Encode and decode URL components, complete URIs and form-style text locally. Supports Unicode, percent encoding, and plus-as-space form decoding.
EncodingQuery String Builder →
Parse and construct query strings with editable parameter rows, duplicate keys, blank values and fragments entirely in your browser.
EncodingHTML Entities Encoder & Decoder →
Encode and decode HTML5 named and numeric character references locally, including ampersands, quotes, Unicode, and HTML special characters.
EncodingUnicode Converter →
Convert Unicode text to U+ code point notation or UTF-8 hex bytes and back, preserving accents and emoji in the browser.
EncodingHEX ↔ Binary Converter →
Convert hexadecimal bytes to 8-bit binary groups and binary bytes back to HEX, with strict input checks and optional spacing.
Security
JWT Decoder →
Decode JWT headers and payloads locally, including Base64URL fields. Inspection only: JWT signatures are not verified.
SecuritySHA-256 Hash Generator →
Compute the SHA-256 hexadecimal digest of UTF-8 text privately with the browser Web Crypto API.
SecuritySecure Password Generator →
Generate random strong passwords in your browser with configurable length, symbols, numbers and uppercase letters. No tracking or server upload.
SecurityRandom Passphrase Generator →
Generate memorable randomized passphrases locally with adjustable word count, capitalization, separators and an optional digit.
SecuritySHA-512 Hash Generator →
Calculate a SHA-512 hash of UTF-8 text locally with HEX, Base64 or Base64URL output. No input is sent to servers.
SecuritySHA-1 Hash Generator (Legacy) →
Calculate legacy SHA-1 digests for file and integration compatibility. Collision resistance is broken; never use SHA-1 for new security designs.
SecurityHMAC Generator →
Generate keyed HMAC-SHA-256 or HMAC-SHA-512 signatures locally using Web Crypto, UTF-8 or HEX keys, and HEX/Base64 output.