Free Developer Tools
A growing collection of free, fast, browser-based tools. No signup, no ads, no limits.
JSON
JSON Formatter with Parse Error Positions
Format, validate, and beautify JSON with syntax highlighting
JSON to TypeScript Converter
Convert JSON to TypeScript interface and type definitions
JSON to Zod Schema Generator
Generate Zod validation schemas from any JSON object
JSON to YAML Converter
Convert JSON objects to clean, readable YAML format
YAML to JSON Converter
Parse YAML and convert it to formatted JSON with validation
Encoding
Base64 Encoder and Decoder with UTF-8 Support
Encode plain text to Base64 or decode Base64 back to text
URL Encoder and Decoder for Query String Values
Encode or decode URLs and URI components instantly
HTML Entity Encoder and Decoder with Numeric Entities
Encode or decode HTML entities in text
JWT Decoder with Readable exp and iat Claims
Decode and inspect JWT tokens without verification
Network
cURL to Fetch Converter
Convert cURL commands to JavaScript fetch() calls instantly
cURL to Axios Converter
Convert cURL commands to Axios request code in seconds
HTTP Headers Viewer
View HTTP response headers for any URL
User-Agent Parser
Parse and decode user-agent strings
Screen Resolution Tester
Test and display current screen resolution details
Converter
Unix Timestamp Converter with Milliseconds
Convert Unix timestamps to human-readable dates and vice versa
ENV to JSON
Convert .env files to JSON format
ENV to Docker Compose
Convert .env files to docker-compose environment snippet
Query String to JSON
Parse URL query strings into JSON objects
JSON to Query String
Convert JSON objects to URL query strings
CSV to JSON Converter with Semicolon and Tab Delimiters
Convert CSV data to JSON array format
JSON to CSV Converter with Headers from Every Key
Convert JSON arrays to CSV format
Formatter
Text
Slug Generator
Generate URL-friendly slugs from any text
Text Case Converter with camelCase and snake_case
Convert text between different cases
Text Diff Checker with Line Numbers on Both Sides
Compare two texts and highlight differences
JavaScript Regex Tester with Capture Groups
Test regular expressions with real-time matching
SEO
Meta Tag Generator
Generate HTML meta tags for SEO
OpenGraph Tag Generator
Generate OpenGraph meta tags for social sharing
robots.txt Generator
Generate robots.txt files for search engine crawlers
sitemap.xml Generator
Generate XML sitemaps for search engines
Canonical Tag Generator
Generate canonical link tags to prevent duplicate content
FAQ Schema Generator
Generate FAQPage structured data (JSON-LD) — no longer a Google rich result
HowTo Schema Generator
Generate HowTo structured data (JSON-LD) — Google retired the rich result in 2023
Breadcrumb Schema Generator
Generate BreadcrumbList structured data (JSON-LD) — desktop-only in Google since 2025
Export
Markdown Preview with Split Pane and Shareable Link
Render Markdown as a shareable preview page
Code to Image
Convert code snippets to beautiful images via canvas
JSON Visual Tree
Visualize JSON data as an interactive tree
Text to File
Download text as .txt, .md, or .json files
OG Image Generator
Generate Open Graph images using Satori in Next.js
HTML to Video Converter
Convert HTML with CSS animations into a downloadable MP4 video — rendered frame-by-frame entirely in your browser.
AI
llms.txt Generator
Generate llms.txt files for LLM crawler guidance
ai.txt Generator
Generate ai.txt files for AI bot permissions
AI Content Chunking Preview
Preview how AI models chunk your content
AI Readability Score
Calculate rule-based readability scores for your content
Content
Heading Structure Analyzer
Analyze the heading hierarchy of your content
Keyword Density Checker
Analyze keyword frequency and density in text
Internal Linking Suggester
Suggest internal linking opportunities from your content
Entity Frequency Counter
Count and analyze entity frequencies in text
Passage Extractor
Extract key passages optimized for featured snippets
Content Word Statistics
Get detailed word and reading statistics for your content
Image
Image to Base64
Convert images to Base64-encoded data URIs
Base64 to Image
Convert Base64 strings back to downloadable images
Image Resizer with Locked Aspect Ratio
Resize images client-side with custom dimensions
Image Cropper
Crop images with a visual selection tool
Image Format Converter
Convert images between PNG, WebP, and JPEG formats
Image Color Palette Extractor
Extract dominant colors from any image
Favicon Generator
Generate favicons in multiple sizes from an image
SVG Optimizer with Metadata Stripping and Live Preview
Optimize SVG files by removing unnecessary data
SVG to JSX
Convert SVG markup to JSX-compatible React components
SVG to Icon
Convert any SVG into a reusable icon — recolor it, make it inherit text color with currentColor, and export as a React component, clean SVG, or data URI
Blur Placeholder Generator
Generate blurred placeholder images for next/image
Frequently Asked Questions
Quick answers to common questions
Are TechLogHub's free developer tools really free?
Yes. The 65+ free tools on TechLogHub run directly in the browser with no signup, no account, and no payment required. Free tools are a permanent part of the platform, not a trial.
Does TechLogHub store data entered into the free tools?
No. The free tools run client-side in the browser. Data entered into a tool is processed locally and is not sent to or stored on TechLogHub servers.
Will the TechLogHub free tools always stay free?
Yes. The free tools are a permanently free part of TechLogHub. No tool is a limited trial or a teaser for a paid version.
Do the TechLogHub tools work offline?
An internet connection is needed to load each tool page. Once loaded, processing happens locally in the browser, so a brief connection drop does not interrupt work in progress.
Can the free developer tools be browsed by category?
Yes. Tools are grouped into categories — formatters, converters, generators, encoders, and more — so the collection can be browsed by type instead of searching one tool at a time.
How to suggest a new free tool for TechLogHub?
Tool suggestions are welcome through the contact form. Suggestions that describe the use case and the input/output expected are the easiest to evaluate and build.
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