Free Developer Tools

The small utilities we build for ourselves on every engagement, now free, with no signup. Live tools open in the Toolbox, where compatible tools can chain into each other. Everything runs 100% in your browser; nothing is ever uploaded.

More tools go live as we vet each one. Want a specific one next? Tell us.

Data & JSON

5 tools
JSON Formatter & YAML ValidatorLive

Format, minify, and validate JSON or YAML with syntax highlighting and precise error locations.

Open in Toolbox →
JSON Diff & CompareSoon

Structural diff between two JSON documents: added, removed, and changed keys at a glance.

JSON ↔ CSV ConverterSoon

Convert JSON arrays to CSV and back, with control over columns and nested fields.

JSONPath TesterSoon

Write JSONPath queries and see matches highlighted against your data in real time.

SQL FormatterSoon

Pretty-print and standardize SQL queries across dialects for readable diffs and reviews.

Encoding & Crypto

5 tools
Hash GeneratorLive

MD5, SHA-1, SHA-256/384/512 of text or files, computed locally via the Web Crypto API.

Open in Toolbox →
JWT InspectorSoon

Decode and inspect JWT headers, claims, and expiry, without sending the token anywhere.

Base64 & Encode SuiteSoon

Base64, URL, and HTML encoding/decoding in one place, with binary-safe handling.

Number Base ConverterSoon

Convert between binary, octal, decimal, and hex with live bit-width awareness.

HTML Entity Encoder/DecoderSoon

Escape and unescape HTML entities for safe markup and copy-paste.

Dev Utilities

4 tools
UUID & ULID GeneratorLive

Generate UUID v4 or ULID identifiers in bulk, with formatting options and one-click copy.

Open in Toolbox →
Regex ExplainerSoon

Break a regular expression into plain-English tokens and test it against sample text live.

Cron Expression ExplainerSoon

Translate cron schedules into readable descriptions and preview upcoming run times.

Epoch / Unix Time ConverterSoon

Convert Unix timestamps to and from human dates across time zones and precisions.

Text

3 tools
Text Case & Slug ConverterLive

Convert text to UPPER, lower, Title, camelCase, snake_case, kebab-case, and URL slugs.

Open in Toolbox →
Text DiffSoon

Line-by-line diff between two blocks of text, with additions and deletions highlighted.

Markdown PreviewSoon

Live-render Markdown to HTML as you type, with a copy-ready output pane.

Web & Front-end

2 tools
Color Contrast CheckerSoon

Check foreground/background pairs against WCAG AA and AAA contrast thresholds.

Meta Tag GeneratorSoon

Generate SEO and Open Graph meta tags with a live social-preview snapshot.

AI & LLM

1 tool
Token CounterSoon

Estimate token counts for prompts across common LLM tokenizers before you spend on them.