All Developer Tools
Browse our complete collection of 43 free online tools. Search by name or task, filter by category, and switch between a grid, grouped and list view.
- 43tools
- 9categories
- 4new
- Runs in your browser
Age Calculator
Exact age in years, months and days.
API Tester
Send HTTP requests and inspect responses.
Base64 Encoder
Encode and decode Base64 text.
Compare, Merge & Diff
Compare two files side by side and merge changes.
Cron Generator
Build and explain cron schedules.
CSS Minifier
Minify CSS for production.
cURL to Code
Convert cURL to fetch, Axios, Python, Go.
Docker Command Helper
Find the right Docker command for a task.
Dockerfile Linter
Check Dockerfiles for common issues.
Env Formatter
Tidy .env files and convert formats.
Git Command Helper
Find the right Git command for a task.
Hash Generator
SHA-256, SHA-512, SHA-1 and MD5 hashes.
HTML Entity Encoder
Escape and unescape HTML entities.
HTML Formatter
Beautify and indent HTML.
HTTP Header Inspector
Explain and audit raw HTTP headers.
JavaScript Minifier
Minify JavaScript with Terser.
JSON Diff
Compare two JSON documents.
JSON Formatter
Format, validate and beautify JSON.
JSON Minifier
Remove whitespace to shrink JSON.
JSON Schema Validator
Validate JSON against a JSON Schema.
JSON to .env
Convert JSON config into .env variables.
JSON to CSV
Convert JSON arrays to CSV files.
JSON to TypeScript
Generate TypeScript interfaces from JSON.
JSON to YAML
Convert between JSON and YAML.
JSON Validator
Check JSON syntax and find errors.
JSONL Dataset Validator
Validate JSONL fine-tuning datasets.
JWT Decoder
Decode and inspect JWT tokens.
JWT Generator
Sign test JWTs with HMAC.
Markdown Previewer
Preview Markdown and export HTML.
Password Generator
Generate strong random passwords.
Prompt Template Builder
Fill {{variables}} in prompt templates.
Query String Parser
Convert query strings to JSON and back.
Regex Tester
Test regular expressions live.
SQL Formatter
Format and beautify SQL queries.
SQL to JSON
Convert SQL INSERT statements to JSON.
Text Diff Checker
Compare two texts line by line.
Timestamp Converter
Convert Unix timestamps and dates.
Token Estimator
Estimate token counts for LLM prompts.
URL Encoder
Percent-encode and decode URL text.
URL Parser
Break a URL into its components.
UUID Generator
Generate UUID v4 and v7 identifiers.
XML Formatter
Format and validate XML.
YAML Validator
Validate YAML syntax and structure.