Free Online Generators for Developers
Generators for the values developers create every day
A lot of development involves creating values on demand: a fresh identifier, a QR code for a print asset, a strong password for a new account, or placeholder text for a mockup. These generators produce those values instantly, using cryptographically secure randomness where randomness matters (UUIDs, passwords) so the output is safe to use in real systems. Everything is generated on your device — none of it is ever transmitted or stored.
All Generators for Developers
UUID Generator
Generate random UUIDs (v4) and time-ordered UUIDs (v7) online. Bulk generate up to 1000 at once and copy with one click.
UUID v7 Generator
Generate UUID v7 identifiers online (RFC 9562). The first 48 bits encode a Unix millisecond timestamp, so v7 UUIDs sort lexicographically by creation time — dramatically better as a database primary key than v4. Bulk generate up to 1000 and inspect the embedded timestamp for each. 100% local.
NanoID
Generate NanoID strings online — 21 characters, URL-safe alphabet (a-Z, 0-9, -, _), same collision safety as UUID v4 in 40% less space. Bulk generate up to 1000 with custom length. 100% local.
ULID
Generate ULID (Universally Unique Lexicographically Sortable Identifier) strings — 26 characters, 48-bit millisecond timestamp + 80-bit randomness, Crockford Base32. Bulk generate up to 1000. 100% local.
CUID2
Generate CUID2 strings online — a modern, secure, collision-resistant ID format designed for horizontal scale and safe use in URLs, cookies, and databases. 100% local, no dependencies.
Snowflake ID
Generate Twitter Snowflake IDs online — 64-bit integers with 41-bit timestamp, 10-bit worker ID, 12-bit sequence. Preview and inspect how Snowflake IDs are structured. 100% local.
KSUID
Generate KSUID strings online — 27-character Base62, 32-bit UTC timestamp + 128-bit randomness. Time-sortable, human-typeable, no delimiters. Designed by Segment for high-volume event streams. 100% local.
Fake Data Generator
Generate realistic mock test data with 25+ field types (name, email, phone, UUID, address, company, IPv4, date, enum, and more). Output as JSON, JSONL, CSV, SQL INSERT statements, or TypeScript. Seeded, reproducible, and 100% local — a faker.js-style generator that runs entirely in your browser.
Lorem Ipsum
Generate placeholder Lorem Ipsum text by words, sentences, or paragraphs for mockups, wireframes, and design drafts. Free, no signup, runs entirely in your browser.
Password Generator
Generate strong, random passwords with customizable length and character sets. Free, no signup — cryptographically secure via crypto.getRandomValues, runs entirely in your browser.
Random Number
Generate random integers or decimals between any min and max. Batch mode makes lists of N numbers with or without duplicates. Optional cryptographically strong randomness via Web Crypto API. 100% local.
Random String
Generate one or many random strings of configurable length and character set. Toggle uppercase, lowercase, digits, symbols, or a custom alphabet. Optional exclude-ambiguous mode (0/O/1/l/I). Cryptographically strong by default. 100% local.
QR Code
Generate QR codes online for URLs, text, WiFi credentials, and more. Download as PNG or SVG. Everything runs locally.
QR Reader
Decode QR codes from an image, screenshot, or photo — right in your browser. Drop a PNG / JPG / WebP and read the URL, text, WiFi credentials, or vCard behind it. 100% local, no upload.
Gitignore Generator
Generate a .gitignore file by selecting your tech stack — Node.js, Python, Go, Rust, Java, macOS, Windows, VS Code, JetBrains, Docker, and Next.js. Combine multiple templates. Copy or download instantly.
UUID Decoder
Decode any UUID to see its version, variant, and structure. Shows whether it's time-based (v1), random (v4), or time-ordered (v7). Extracts the node identifier. 100% local.
When to use these tools
Use these tools to mint unique IDs for records, produce scannable QR codes for links or Wi-Fi credentials, create a strong password for a new account, or fill a design mockup with realistic-looking text.
Frequently Asked Questions
Are the generated values secure?
Yes. UUIDs and passwords come from the browser's cryptographically secure `crypto.getRandomValues`, not `Math.random`. QR codes are rendered locally and never sent to any server.
What is the difference between UUID v4 and v7?
UUID v4 is fully random. UUID v7 embeds a Unix timestamp in the leading bits, so ids are time-ordered — much better as a database primary key because they preserve insert order.