Developer Tools

Format, validate, convert, and debug code — JSON, XML, YAML, SQL, HTML, JS/CSS, JWT, hashes, and more.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text — instantly, in your browser.

Chmod Calculator

Convert Unix file permission checkboxes to octal and symbolic notation, and back.

Cron Generator

Build a cron expression from simple fields, or describe an existing one in plain English.

CSS Beautifier

Pretty-print minified or messy CSS with proper indentation.

CSS Minifier

Strip comments and whitespace from CSS to shrink file size.

Hash Generator

Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text.

HTML Beautifier

Pretty-print minified or messy HTML with proper tag indentation.

HTML Entity Encode / Decode

Escape & < > " ' for safe HTML, and decode entities back to text — instantly.

HTML Minifier

Strip comments and unnecessary whitespace from HTML to shrink file size.

HTML Viewer

Paste HTML and see a live, sandboxed preview of how it renders.

JSON ⇄ CSV Converter

Convert a JSON array of objects to RFC 4180 CSV, and convert CSV back to JSON.

JSON Compare

Diff two JSON documents and see every added, removed, and changed value.

JSON Formatter

Format, validate, and minify JSON instantly in your browser — no upload, no signup.

JSON to Table

Paste JSON and instantly view it as a readable table — export array data straight to CSV.

JWT Decoder

Decode a JSON Web Token's header and payload — no signature verification.

Markdown Previewer

Write GitHub-Flavored Markdown on the left, see the live rendered HTML on the right — fully in-browser.

Number Base Converter

Convert numbers between binary, octal, decimal, and hex — and see all four at once.

Regex Builder

Build a regular expression by clicking tokens and presets — no syntax memorization.

Regex Tester

Test a regular expression against a string with live highlighted matches.

Robots.txt Generator

Build a robots.txt file with allow/disallow rules and a sitemap URL.

SQL Formatter

Pretty-print messy or minified SQL with proper clause indentation.

Timestamp Converter

Convert Unix timestamps and date strings to ISO, UTC, local, and relative time.

URL Encode / Decode

Percent-encode or decode a URL or query parameter value.

UUID Generator

Generate cryptographically random UUID v4 values, one at a time or in bulk.

XML Formatter

Pretty-print or minify XML, with well-formedness checking.

XML Viewer

Explore XML as a collapsible tree instead of a flat block of text.