Developer tools

Browse developer tools that run locally in your browser.

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Hash and Checksum Generator
Calculate a SHA-256 file hash, compare an expected checksum, and copy the digest with Web Crypto.
QR Code Generator
Create a Wi-Fi QR code from an SSID, security mode, password, and hidden-network setting, then export PNG or SVG.
URL Parser and Query Inspector
Parse URL query parameters into editable rows, preserve repeated and empty values, rebuild the URL, and copy query or JSON.
JWT Decoder and Claims Inspector
Decode JWT header and payload, inspect claims and expiry, and view diagnostics without verifying signatures.
JavaScript Regex Tester and Replace Preview
Test JavaScript regex flags, capture groups, match ranges, and replacement output against sample text.

Guides

Base64 Encoding vs Encryption — They Are Not the SameBase64 looks encrypted but anyone can decode it in a second. Understand encoding vs encryption vs hashing and stop treating Base64 as security.Convert CSV to JSONTransform CSV into JSON and JSON back into CSV entirely in your browser. Pick a delimiter, control header handling and typing, preview rows and columns, and read a conversion summary without uploading your data anywhere.Convert YAML, JSON, TOML, and XMLMove data between JSON, YAML, TOML, and XML locally. Choose source and target formats, see a summary and warnings, then copy or download the converted output.Create QR Codes for URL, Wi-Fi, and ContactsMake a QR code for a link, Wi-Fi network, or vCard and download it instantly. Choose size and error-correction level — all locally in your browser.Decode and Inspect JWT Tokens SafelySee exactly what's inside a JSON Web Token: issuer, expiry, scopes, and claims. Decode locally and spot expired or suspicious tokens before trusting them.Generate Strong Passwords and TokensA strong password generator that runs in your browser. Create passwords, passphrases, and hex tokens with Web Crypto and never send your secret to a server.