24 professional developer tools that run entirely in your browser. Format JSON, encode Base64, test regex, decode JWTs, generate hashes — all free, all private. No data ever leaves your device.
Click any tool to start using it instantly. Every tool works in your browser — your code and data never leave your device.
Pretty-print and validate JSON with 2 / 4 space indentation.
Convert JSON arrays to CSV format. Auto-detects columns, proper escaping, download as .csv.
Convert CSV data to a JSON array of objects. Handles quoted fields and commas.
Beautify messy HTML with proper indentation or minify it for production.
Minify HTML by stripping comments, collapsing whitespace. Shows size savings.
Beautify CSS with proper indentation or minify it for production. Strips comments.
Minify CSS by stripping comments, collapsing whitespace, removing trailing semicolons.
Beautify or minify JavaScript code. Strips comments, normalizes indentation.
Minify JS by stripping comments, collapsing whitespace. Shows compression stats.
Encode text to Base64 or decode Base64 back to text. Full Unicode and emoji support.
Encode special characters or decode percent-encoded URLs. Pure browser.
Encode special characters to HTML entities or decode entities back to text.
Generate MD5 hashes from any text. Pure JS RFC 1321 implementation, runs in your browser.
Generate SHA-256, SHA-512 or SHA-1 hashes using the native Web Crypto API.
Generate cryptographically random v4 UUIDs in bulk. Uppercase and no-dash options.
Test regular expressions with live matching, capture groups and match highlighting.
Convert Markdown to clean HTML. Supports headings, bold, italic, links, code blocks, lists.
Convert HTML to clean Markdown. Handles headings, links, images, lists and code blocks.
Decode and inspect JSON Web Tokens. View header, payload, claims and expiration status.
Build cron expressions visually with plain-English descriptions and next-run preview.
Convert JSON data to YAML format with proper indentation. Handles nested objects and arrays.
Convert YAML data to JSON format. Validates YAML syntax and outputs clean formatted JSON.
Format and beautify SQL queries with proper indentation. Supports MySQL, PostgreSQL, SQLite and T-SQL.
Test JSONPath expressions against JSON data. See matched results highlighted in real-time.
Speed kills context-switching. Every time you leave your editor to open a separate JSON formatter or Base64 encoder, you break your flow. Browser-based tools load instantly in a tab — no installs, no package managers, no CLI flags to remember.
Privacy matters for production data. Pasting API keys, JWT tokens, or customer data into random online tools is a security risk. Our tools process everything locally in your browser using JavaScript and the Web Crypto API. Your data never touches a server — ever.
Beyond privacy, browser-based tools work offline once loaded. On a plane, in a cafe with spotty WiFi, or behind a corporate firewall — your JSON Formatter, Regex Tester, and Hash Generator all keep working without interruption.
For teams, shareable URLs mean everyone uses the same tools with zero setup. No "install this CLI" or "brew install that" — just send a link. Our JWT Decoder and URL Encoder are bookmarked by thousands of developers who need them daily.
Format API responses, encode/decode payloads, and inspect JWTs without leaving your browser. Essential tools for every REST and GraphQL workflow.
Beautify messy code for readability or minify production assets to shave kilobytes. Supports HTML, CSS and JavaScript with customizable options.
Generate secure passwords, create cryptographic hashes, produce UUIDs for database keys, and compute HMACs for API authentication signatures.
Convert between popular data formats instantly. Transform JSON to CSV for spreadsheets, CSV to JSON for APIs, Markdown to HTML for publishing, and YAML to JSON for configs.
Why use 10 different websites when one does it all?
Choose from 24 specialized developer tools above — formatting, encoding, hashing, conversion, and more.
Paste JSON, Base64 strings, URLs, regex patterns, JWTs, or any data. Most tools auto-detect input format.
See formatted output, decoded values, matching highlights, or converted data in real-time. No waiting, no server round-trips.
One-click copy to clipboard or download results as a file. Your input is never stored — close the tab and it's gone.
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