Developer Tools

Compare text online: Compare two texts, configs, or code versions, see differences line by line and word by word, and copy them as a Unified Diff. Runs entirely in your browser.

Encode and decode text in Base64, including a URL-safe variant and clear error messages, entirely in your browser.

Generate and verify Bcrypt hashes—entirely in your browser, with an adjustable cost factor.

Build Unix/Linux file permissions using checkboxes to get an octal value and symbolic notation, or decode them in reverse — including setuid/setgid/the sticky bit and a ready-to-copy chmod command.

Build Cron expressions using a form, with plain-language explanations and a preview of upcoming execution times—all in your browser.

Convert Unix timestamps (seconds, milliseconds, microseconds, and nanoseconds) to a readable date and back — with a live ticker, ISO 8601/RFC 2822, and relative time, entirely in your browser.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files and compare checksums. Runs entirely in your browser.

Format, minify, and validate JSON with syntax highlighting, error messages, and downloads, entirely in your browser.

Decode, edit, and re-sign JSON Web Tokens, including signature verification for HS256/HS384/HS512 and RS/PS/ES verification with a public key, entirely in your browser.

Generate strong, random passwords directly in your browser — nothing is stored or transmitted.

Test regular expressions live against the native JavaScript engine—with match highlighting, capture groups, and replace mode, all in your browser.

Create robots.txt using a rule editor or per-bot settings, including GPTBot, Google-Extended, and more.

Create a sitemap.xml from a list of URLs, with duplicate and domain checks, lastmod and an automatic sitemap index from 50,000 addresses. Runs in your browser.

Generate an Ed25519 or RSA key pair directly in your browser, optionally with a passphrase. The private key never leaves your device.

Generate version 1, 4, 5, and 7 UUIDs individually or in bulk, with customizable formatting, entirely in your browser.

Validate, format, minify, and automatically repair XML (unescaped characters, missing tags, missing declaration)—100% in your browser, without uploading.

Check YAML syntax and format it consistently or convert it directly to JSON. Supports multiple documents separated by `---` (e.g., Kubernetes manifests), with precise line and column error messages. Runs entirely in your browser.

Password Checker: Check your password's strength, cracking time, and pattern warnings. Runs entirely in your browser; nothing is transmitted.

Encode and decode URLs and text online: compare encodeURIComponent, encodeURI, and form encoding, with a query parameter table and UTM link builder. Runs entirely in your browser.

Convert JSON to CSV and CSV to JSON: flatten nested objects, detect delimiters, create Excel-ready CSV with BOM, and preview JSON and CSV files as tables. Runs entirely in your browser.

Convert dates and times between any number of time zones, with automatic detection of your time zone, daylight saving time support, and notices when the date changes. Entirely in your browser.

Searchable list of common HTTP status codes from 100 to 526: meanings of 404, 403, 500, 502, and 503, common causes and fixes, with nginx and Apache examples. Runs entirely in your browser.

Create Apache .htaccess and .htpasswd files online: 301 redirects, HTTPS, password protection with bcrypt, WordPress rules, error pages, caching, GZIP, and hotlink protection. Runs entirely in your browser.

Write Markdown online with a live preview: GitHub READMEs and Discord messages, tables from Excel, and PDF or HTML export. Entirely in your browser.

Format, beautify, and minify SQL online for MySQL, MariaDB, and PostgreSQL, with indentation and keyword casing. Runs entirely in your browser, with no uploads.

Try all 36 values of the CSS cursor property with your mouse, filter by use case, and copy the declaration. Includes a test area and runs in your browser.

Format, indent, and beautify HTML and CSS online with automatic language detection. Runs entirely in your browser, with no uploads.

Prepare large SQL dumps for phpMyAdmin: compress them as .sql.gz or split them at statement boundaries into parts under 2 MB, with import fixes for DEFINER, CREATE DATABASE, and MySQL 8 collations. Runs in your browser, with no upload.

Minify and reduce JavaScript, CSS and HTML online, with before-and-after size comparisons including gzip. Runs entirely in your browser, with no upload.

Create Nassi–Shneiderman diagrams online according to DIN 66261: use a block builder or pseudocode, switch to a program flowchart, and choose from 9 exam templates with PNG, SVG, and PDF export.

Create program flowcharts online according to DIN 66001: use automatic layout, a block builder, or pseudocode; switch to a Nassi–Shneiderman diagram; and choose from 9 exam templates with PNG, SVG, and PDF export.

Number base converter: Convert hex to decimal, binary to decimal, and back, plus octal and any base up to 36. Includes step-by-step calculations, two's complement, and clickable bits.