Static-first tools

Privacy-first online tools that work fast

A static-first collection of browser-side tools for cryptography and developer workflows, built with clear privacy notes and fast static pages.

Open crypto tools Open developer tools Open converters Open calculators Open API page View tool catalog

No signup, no server-side processing for browser tools, and clear limits documented per page.

20production tools

0signup required

100%static shell

5active verticals

Calculators

Use lightweight calculators for VAT, discounts, margins, date differences, and working-day planning directly in your browser.

VAT, Discount, And Margin Calculator

Calculate VAT-inclusive and VAT-exclusive prices, discount effects, markup, and margin percentages.

Date Difference And Working Days Calculator

Calculate day differences and business days between two dates with weekend exclusion options.

Converters

This section will collect practical converters for files, text, encodings, colors, and developer workflows. The first production-ready conversion utility is currently Base64 encode and decode in the crypto section.

Online Converters

A source-first hub for browser-side converters. Production converters will be added only when they meet the new quality and privacy bar.

Base64 Encode And Decode

The first production-ready conversion utility is available now and runs locally in the browser.

Converter Tools

Color Converter

Convert colors between HEX, RGB, and HSL in your browser with a live preview.

Number Base Converter

Convert integers between binary, decimal, hexadecimal, and octal in your browser.

Unit Converter

Convert temperature and length units in your browser with instant results and common engineering scales.

JSON And CSV Converter

Convert JSON arrays to CSV and parse CSV back to JSON locally in your browser.

Developer Utilities

Use small, reliable utilities for everyday developer tasks: UUID/GUID generation, JSON formatting, URL encoding, HTML escaping, timestamps, MIME and CSV checks, regex, token decoding, and integrity helpers.

UUID / GUID Generator

Generate RFC 4122 version 4 UUIDs in your browser with copy-ready output and clear usage notes.

JSON Formatter And Validator

Format, validate, and minify JSON in your browser with clear error messages and copy-ready output.

URL Encoder And Decoder

Encode and decode URL components in your browser, with clear notes about percent encoding and privacy risks in URLs.

HTML Escape And Unescape

Escape and unescape HTML entities in your browser for safer display of text in markup contexts.

Unix Timestamp Converter

Convert Unix timestamps to readable UTC/local dates and convert dates back to timestamps in your browser.

JSON Schema Validator

Validate JSON data against a JSON Schema-like object in your browser with clear limitations.

JWT Decoder

Decode JWT header and payload locally in your browser with explicit warnings about token secrecy and signature verification.

Regex Tester

Test JavaScript regular expressions in your browser with match output and ReDoS warnings.

MIME Sniffer And File Signature Viewer

Inspect file MIME hints and signature bytes in your browser without uploading the file.

SRI Hash Calculator

Generate Subresource Integrity strings for script and style assets using SHA-256, SHA-384, or SHA-512.

CSV Editor And Validator

Validate CSV rows and columns in your browser, preview parsed output, and spot inconsistent records.

UTM Builder And Parser

Build clean UTM links and parse existing UTM URLs in your browser for analytics workflows.

Launch Vertical: Crypto

Use focused crypto utilities for hashing, encoding, random generation, and learning when each primitive is appropriate. The first tools in this section are designed to run locally in the browser whenever possible.

SHA-256 Hash Generator

Generate a SHA-256 hash in your browser. Input stays on your device and is processed with the Web Crypto API.

MD5 Hash Generator With Security Warning

Generate MD5 hashes for legacy checksums and learn why MD5 should not be used for security-sensitive work.

Base64 Encode and Decode

Encode and decode Base64 text in your browser, with clear notes about what Base64 is and is not.

Secure Random Password Generator

Generate strong random passwords in your browser using cryptographically secure random values.

Secure Random Hex Generator

Generate cryptographically secure random hexadecimal strings in your browser for tokens, test data, and identifiers.

Hash Algorithm Comparison

Compare MD5, SHA-1, SHA-256, SHA-512, BLAKE2, and BLAKE3 by security status and practical use case.

File Hash Generator

Generate SHA-256 hashes for local files in your browser without uploading file contents.

Text Tools

Use focused text utilities for counting words, changing case, and preparing content without uploading text to a server.