Small utilities for everyday engineering work.

Hash & HMAC

MD5 and SHA-* digests, HMAC, hex or Base64 output, and file hashing.

Base64

Encode or decode Base64 strings and compare results side by side.

Image → data URL

Encode an image file as a Base64 data URL for HTML or CSS.

JWT decoder

Inspect header and payload—verification is not performed.

UUID generator

Generate RFC 4122 version 4 UUIDs with one click.

Unix timestamp

Epoch ↔ ISO, quick offsets from now, and timezone-aware display.

Regex tester

Try a JavaScript regex against sample text with match highlights.

JSON formatter

Prettify or minify JSON with clear error messages.

JSON viewer

Explore JSON as a tree, run JSONPath queries, filter paths, and scroll large arrays.

URL encoder

Encode or decode URL components with encodeURIComponent.

Cron helper

Split a cron expression and see what each field means.

Text & JSON diff

Compare two texts or normalized JSON documents with highlighted line changes.

URL parser

Break a URL into scheme, host, path, query, and hash with quick copy fields.

YAML ↔ JSON

Convert between YAML and JSON with the yaml library and clear parse errors.

curl converter

Turn a simple curl command into fetch, axios, or HTTPie-style snippets (best-effort parser).

Color & contrast

Hex pickers, WCAG contrast, harmony palettes, and dominant colors from an image — all in the browser.

Text case

UPPER, lower, title, sentence, camelCase, snake_case, kebab-case, CONSTANT_CASE, and slugify.

Text counter

Words, characters, lines, and approximate reading time.

Lorem ipsum

Generate placeholder paragraphs for layouts and mocks.

Markdown preview

Render Markdown to sanitized HTML with marked and DOMPurify.

Password generator

Length, character sets, and copy to clipboard.

Number base converter

Convert integers between binary, octal, decimal, and hexadecimal.

QR code generator

Render a scannable QR code from any string.