Free Online Developer Tools for Web Developers

All processing runs entirely in your browser. No passwords, hashes, encoded strings, JSON, or generated values are sent to any server. The SHA hash generator uses the browser SubtleCrypto API directly. The Base64 encoder, URL encoder, and JSON formatter use native browser functions. The only exception is the IP address lookup tool, which makes a request to an external geolocation API to resolve your public IP.

Yes. Both the password generator and UUID v4 generator use the browser crypto.getRandomValues() API, which draws entropy from system-level sources. This produces values that pass cryptographic randomness tests and are suitable for production use in authentication systems, database primary keys, and session token generation.

The SHA hash generator supports SHA-1, SHA-256, SHA-384, and SHA-512 via the browser SubtleCrypto API. SHA-256 and SHA-512 are the recommended choices for modern security applications. SHA-1 is included for legacy compatibility and verification use cases only. All hashing runs client-side with no data transmitted.

Yes. The JSON formatter and validator handles large JSON payloads. Paste the raw JSON from any API response, and the tool formats it with proper indentation, highlights syntax, and flags any parse errors with a clear error message. It works for minified JSON, nested objects, and arrays of any depth.

Base64 encoding converts binary data or text into a string of ASCII characters using a 64-character alphabet. It is used for embedding binary data in JSON, HTML, and email. URL encoding converts characters that are not safe in a URL into percent-encoded equivalents, such as spaces becoming %20. Use the Base64 encoder for data payloads and the URL encoder for query string parameters and path segments.

Yes. All tools on this page are responsive and usable on phone and tablet. Input fields, copy buttons, and output areas adapt to any screen width. The JSON formatter and Base64 tools handle large text inputs on mobile without performance issues. No app download is required.

The QR code generator converts any URL, text, or string into a scannable QR code image. Common uses include linking physical materials to web pages, sharing Wi-Fi credentials, embedding contact details, and adding quick-access links to printed documents. The QR code is generated entirely in the browser and can be downloaded as an image.

The test data generator creates realistic fake identity records including names, email addresses, phone numbers, addresses, and other common form fields. It is designed for populating test databases, seeding development environments, and UI testing without using real personal data. All generated data is random and fictional.