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All 30 Free Online Developer Tools

Every utility on DailyUtil, grouped by what you are trying to do. Format and validate JSON, YAML and XML. Encode Base64, decode JWTs, generate UUIDs and strong passwords. Look up DNS records, IP addresses and hosting providers. Convert timezones, units and currencies, and model salary or loan repayments.

Every tool runs entirely in your browser. Nothing you paste is uploaded, logged or stored on a server — which means they are safe for production API responses, internal config and confidential data. No sign-up, no usage limits, no cost.

Data Formats

Parse, format, validate and explore structured data. Paste a minified API response or a malformed config file and get a readable, colour-coded tree back — with the exact line and reason for any syntax error.

Encoding & Security

Encode, decode and generate credentials without sending anything to a server. Inspect JWT claims, round-trip Base64 payloads, escape URL components, and generate passwords from the browser's cryptographic random source.

Text & Code

Transform, compare and preview text and code. Convert case, clean whitespace, diff two versions line by line, render Markdown with GitHub-flavoured syntax highlighting, or export a document straight to PDF.

Web & Networking

Investigate what is actually running behind a domain. Resolve DNS records, trace an IP to its ISP and ASN, identify a site's hosting provider and CDN, calculate subnet ranges, and build HTTP requests with full header control.

Design

Pick colours and convert between formats. Move between HEX, RGB and HSL with one click and copy the value straight into your stylesheet.

Time & Date

Work with dates, schedules and timezones. Build and explain cron expressions in plain English, convert Unix timestamps, plan meetings across zones, and time anything with a precision stopwatch.

Utilities

Everyday calculators that do the arithmetic properly. Convert between metric, imperial and SI units, and model take-home pay or loan repayments — including ATO-accurate Australian tax, HECS/HELP and superannuation.