About

FreeCodeTools is a collection of free online tools for web developers, built by Marko Denic and running since 2019.

It covers the small, everyday jobs that interrupt real work: formatting a JSON response, checking what a cron expression means, converting a Unix timestamp, generating a UUID or comparing two versions of a file. Open a tool, paste your input and get the result.

Free, with no sign-up

Every tool is free for personal and commercial projects. There is no account, no paywall and no usage limit beyond the size limits listed in the FAQ.

Your data stays in your browser

Everything you type or paste into a tool is processed on your device. Read the privacy policy for details.

Code & Text

JSON Formatter: Format, validate and minify JSON.
JSON Viewer: View JSON as a collapsible tree.
JSON to CSV: Convert JSON arrays to CSV.
JSON Escape / Unescape: Escape and unescape JSON strings.
XML Formatter: Format, check and minify XML.
Word Counter: Count words, characters and sentences.
Code Minifier: Minify CSS, HTML and JS code.
Code Beautifier: Beautify CSS, HTML and JS code.
YAML to JSON: Convert YAML to JSON and back.
Diff Checker: Compare two texts and see changes.
Cron Expression Explainer: Explain cron schedules in plain English.

Converters & Generators

Hex Converter: Convert hex, binary, decimal and text.
URL Encoder / Decoder: Encode and decode URLs.
UUID Generator: Generate UUID v4 and v7.
PX to REM Converter: Convert pixels to rem and back.
QR Code Generator: Create QR codes for URLs and text.
Open Graph Generator: Create Open Graph meta tags.
Twitter Card Generator: Create Twitter Card meta tags.
Unix Timestamp Converter: Convert epoch time to dates and back.
Color Converter: Convert HEX, RGB, HSL and OKLCH.
Lorem Ipsum Generator: Generate placeholder text.

Suggest a tool

Missing something you need? Message Marko on X at @denicmarko. Suggestions shape what gets built next.

No claims are made to the accuracy, performance, or uptime of these tools. Use at your own risk.