Tools
Local browser tools for engineering work
Focused utilities for payload inspection, API debugging, compatibility checks, and privacy-preserving data transforms.
Crypto
AES EncryptorEncrypt and decrypt with AES-GCM, AES-CBC, or AES-ECB. Supports multiple paddings and key/IV/input/output encodings.
DES Compatibility ToolDES with CBC, ECB, CFB, OFB, and CTR modes. Supports padding and multiple encodings for key, IV, input, and output.
SM4 Compatibility ToolSM4-CBC and SM4-ECB with configurable padding and encoding support for key, IV, input, and output.
Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 digests. Input supports text, Base64, or Hex encoding.
HMAC GeneratorGenerate keyed digests with HMAC-MD5, HMAC-SHA256, or HMAC-SHA512. Key and message support multiple encodings.
JWT DecoderDecode JWT header and payload locally, with optional HMAC signature verification.
File HashCompute MD5, SHA-1, SHA-256, or SHA-512 digests of a local file.
Key Pair GeneratorGenerate RSA-OAEP or elliptic-curve (ECDSA/ECDH) key pairs and export them as JWK.
Data
JSON FormatterFormat, minify, and validate JSON without uploading it.
JSON DiffCompare two JSON documents and show structural changes.
Base64 TextEncode and decode UTF-8 text as Base64.
Base64 ImageConvert an image file to Base64, or decode Base64 back to an image with auto-detected format.
URL EncoderEncode or decode URL components.
Timestamp ConverterConvert between Unix timestamps and human-readable dates.
URL ParserBreak a URL into protocol, host, port, path, query parameters, and fragment.
Date CalculatorDiff two dates, add a duration to a date, or convert a date to another timezone.
QR Code DecoderDecode QR codes from an image file or a pasted screenshot, entirely in the browser.
Cron ParserParse a standard 5-field cron expression and preview the next run times.
Text
Text DiffCompare two texts line by line and show additions and removals.
Case ConverterConvert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and plain lower/upper case.
String EscapeEscape or unescape strings with backslash sequences like \n, \t, and \uXXXX.
Markdown PreviewWrite markdown on the left and see it rendered live on the right.
Regex TesterTest a regular expression against text and inspect matches and capture groups.
Generator
UUID GeneratorGenerate UUID v4 or time-ordered UUID v7 in bulk, with uppercase and hyphen options.
Password GeneratorGenerate random passwords with configurable length, character sets, and ambiguity filtering.
QR Code GeneratorGenerate QR codes locally with selectable size and error-correction level, and download as PNG.