SmartTools

Calculate, convert and quickly solve everyday problems: free online tools that run in your browser and never send your data anywhere.

17 tools All tools →

Most used

Base64 Encode and Decode

Convert text and files to Base64 and back, including the URL safe variant.

SQL Formatter

Format and minify SQL queries with dialect awareness: SQL Server, MySQL, PostgreSQL, Oracle and SQLite.

HTML Viewer and Formatter

See how an HTML fragment renders, reformat it, and check its structure and nesting.

Secure Password Generator

Generate strong passwords in your browser, with an entropy estimate and nothing transmitted.

SHA Hash Generator

Compute SHA-1, SHA-256, SHA-384 and SHA-512 of any text, without the text leaving your browser.

Unix Timestamp Converter

Convert between Unix timestamps and readable dates, in your own time zone and in UTC.

New tools

JSON to Classes Generator

Generate C#, TypeScript, Java, Python and Go classes from JSON, with the original names preserved.

ZPL Label Viewer

Preview a ZPL label's layout — positions, text, boxes and rotations — without running a test print.

HTML Viewer and Formatter

See how an HTML fragment renders, reformat it, and check its structure and nesting.

IPv4 Subnet Calculator

From a CIDR address, derive the network, broadcast, usable range, mask and wildcard.

Secure Password Generator

Generate strong passwords in your browser, with an entropy estimate and nothing transmitted.

UUID Generator

Generate random v4 or time-sortable v7 UUIDs, one at a time or in bulk.

Categories

Converters

Conversions between data formats and units.

4 tools

Labels

Tools for label printing and printer command languages.

1 tool

Informatics

Text

Tools to format, convert and analyse text.

4 tools

Encoding

Encoding, decoding and hashing functions.

4 tools

Network

Network diagnostics, IP addressing and DNS.

1 tool

Generators

Generators for identifiers, passwords and test data.

2 tools

Web

Utilities for web development, HTML, CSS and JavaScript.

1 tool