Developer tools
Build, debug, and transform — 64 free browser-based utilities, nothing uploaded.
No tools matched your search query.
Request a toolText & Data
Text & Data
JSON Formatter & Validator
Beautify, minify, and validate JSON with instant error locations.
Text & Data
JSONPath Tester
Query JSON data with JSONPath expressions locally in your browser.
Text & Data
JSON Schema Validator
Validate JSON data against a JSON Schema locally in your browser.
Text & Data
Line Filter
Keep or remove matching lines from text locally in your browser.
Text & Data
Markdown Table Generator
Turn CSV-style rows into a Markdown table locally in your browser.
Text & Data
JSON Diff Checker
Compare two JSON documents and inspect changed paths locally.
Text & Data
Email & URL Extractor
Extract unique email addresses and URLs from text locally.
Text & Data
HTML Formatter & Minifier
Format and minify HTML locally in your browser.
Text & Data
CSS Formatter & Minifier
Format and minify CSS locally in your browser.
Text & Data
JavaScript Formatter & Minifier
Format and minify JavaScript locally in your browser.
Text & Data
YAML Formatter & Validator
Validate, format, and convert YAML documents entirely in your browser.
Text & Data
XML Formatter & Validator
Validate XML syntax and pretty-print XML without uploading it.
Text & Data
URL Parser & Query Editor
Inspect URL components and query parameters locally in your browser.
Text & Data
JWT Decoder
Decode JSON Web Token headers and payloads locally without verification.
Text & Data
Regex Tester
Test JavaScript regular expressions against sample text with live match highlighting.
Text & Data
Text Diff Checker
Compare two blocks of text and see line-by-line differences.
Text & Data
Markdown Previewer
Write Markdown on the left, see the rendered HTML on the right.
Text & Data
Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase and more.
Text & Data
Word & Character Counter
Count words, characters, sentences, and estimated reading time.
Text & Data
Text Cleaner & Line Tools
Sort, deduplicate, normalize, and replace text locally in your browser.
Text & Data
HTML to Text Converter
Extract readable plain text from HTML locally in your browser.
Text & Data
Slug Generator
Turn titles and text into clean URL slugs locally.
Text & Data
JSON Escape / Unescape
Escape text for embedding in JSON, or unescape a JSON string literal back to raw text.
Text & Data
JSON Key Sorter
Recursively sort JSON object keys alphabetically for cleaner, diff-friendly output.
Text & Data
JSON to TypeScript
Generate TypeScript interfaces from a JSON document.
Text & Data
JSON Flatten / Unflatten
Flatten nested JSON into dot-notation keys, or rebuild nested JSON from flat keys.
Text & Data
JSON Key Renamer
Rename JSON object keys everywhere they appear, at any nesting depth.
Text & Data
JSON to Markdown Table
Convert an array of JSON objects into a Markdown table.
Text & Data
JSON to HTML Table
Convert an array of JSON objects into an HTML table.
Text & Data
JSON to SQL
Generate SQL INSERT statements from an array of JSON objects.
Text & Data
JSON Mock Data Generator
Generate an array of fake JSON records from a small schema.
Text & Data
SQL Formatter
Format and beautify SQL queries for readability.
Text & Data
HTML Entity Encoder / Decoder
Encode text to HTML entities, or decode HTML entities back to text.
Text & Data
Line Numberer
Add sequential line numbers to text with configurable starting values and separators.
Converters
Converters
CSV to JSON Converter
Convert CSV data to JSON or JSON records to CSV locally in your browser.
Converters
JSON to YAML Converter
Convert JSON documents to YAML and YAML documents to JSON locally.
Converters
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates in any timezone.
Converters
Data Size & Unit Converter
Convert between bytes, KB, MB, GB, TB and more.
Converters
.env to JSON / YAML Converter
Convert a .env file of KEY=VALUE pairs to JSON or YAML.
Converters
XML to JSON Converter
Convert XML to JSON or JSON back to XML entirely in your browser.
Encoding
Encoding
Base64 Encoder / Decoder
Convert text and files to and from Base64, entirely in your browser.
Encoding
URL Encoder / Decoder
Percent-encode or decode URLs and query string components.
Encoding
Hex ↔ Text Converter
Convert text to hexadecimal bytes, or hex back to text.
Encoding
Number Base Converter
Convert a number between binary, octal, decimal, and hexadecimal.
Generators
Generators
Lorem Ipsum Generator
Generate placeholder text locally in your browser.
Generators
Random String Generator
Create cryptographically secure random strings locally.
Generators
QR Code Generator
Generate downloadable QR codes locally in your browser.
Generators
Password Generator
Generate strong, random passwords with configurable length and character sets.
Generators
UUID Generator
Generate v4 UUIDs individually or in bulk.
Generators
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of text.
Generators
HMAC Generator
Compute an HMAC for text using a secret key and SHA-256, SHA-384, or SHA-512.
HTTP & API
HTTP & API
HTTP Status Code Lookup
Look up what any HTTP status code means, with a searchable reference table.
HTTP & API
MIME Type Lookup
Look up the MIME type for any file extension, with a searchable reference table.
HTTP & API
HTTP Headers Parser
Paste raw HTTP request or response headers to see them as a table with plain-language explanations.
HTTP & API
cURL Code Converter
Convert cURL commands to Fetch, Axios, Python, PHP, or Go code entirely in your browser.
HTTP & API
HTTP Request Builder
Build an HTTP request from method, URL, headers, query parameters, and body, then export it as a raw request, cURL command, or fetch() snippet.
DevOps
DevOps
CIDR / Subnet Calculator
Calculate network address, broadcast address, netmask, and usable host range from CIDR notation.
DevOps
Cron Expression Parser
Parse a cron expression and preview its next scheduled run times.
DevOps
.gitignore Generator
Combine common .gitignore snippets for languages and editors into one file.
DevOps
chmod Calculator
Convert Unix file permissions between checkboxes, octal, and symbolic notation.
DevOps
Cron Expression Generator
Build and validate a standard five-field cron expression from individual schedule fields.
DevOps
IP Range Calculator
Calculate the inclusive address count and smallest covering CIDR block for an IPv4 range.
Security
Missing a utility? Request a tool.