Free online developer tools
Browse practical DevTools for JSON formatting, PDF and image conversion, API testing, OpenAPI mock data, SEO audits, QR codes, hashes, JWT decoding, cron expressions, token counting, regex testing, and social preview checks.
49 tools
All Tools
49 utilitiesData Transformation
- essential
JSON Formatter
Format and beautify your JSON data with syntax highlighting and compression and download it.
Open tooldata Image to JSON
Convert images to JSON format for data extraction and analysis.
Open tooldata- new
PII Redactor
Find and redact personal data in JSON or CSV, keeping relationships intact so the data still joins.
Open tooldata Sheet to JSON
Convert .xlsx or .csv files to JSON. Perfect for transforming spreadsheet data into structured formats.
Open tooldataJSON to CSV/XLSX
Convert JSON data into CSV or Excel format for analysis and portability.
Open tooldata- new
HTML to PDF
Convert HTML content into downloadable PDF documents for reports or printing.
Open tooldata - new
PDF to Markdown & JSON
Extract a PDF's text as Markdown, or a structured JSON report with layout and OCR hints.
Open tooldata - new
Document to Markdown
Convert Word (DOCX, DOC), Excel (XLSX, CSV), PowerPoint (PPTX), OpenDocument, RTF, EPUB, and PDF files into clean Markdown.
Open tooldata - new
HAR Analyzer
Upload HTTP Archive files to inspect request timing, status codes, domains, transfer sizes, and web performance bottlenecks.
Open tooldata - new
JSON Schema Visualizer
Visualize your JSON schema structure as a diagram or rendered HTML.
Open tooldata Text Diff Viewer
Compare two text inputs and visually highlight their differences.
Open tooldata- essential
JSON to TypeScript
Generate TypeScript types from JSON data.
Open tooldata - essential
Image Compressor
Compress images to reduce file size and improve loading times.
Open tooldata - new
Image Converter
Convert images to different formats with ease.
Open tooldata - new
Text to PDF
Convert text to PDF with ease.
Open tooldata - soon
YAML to JSON and vice versa
Convert between YAML and JSON formats quickly and easily.
in progressdata - soon
CSV Column Extractor
Extract specific columns from CSV files for analysis or filtering.
in progressdata - soon
Merge Multiple JSONs
Combine multiple JSON objects into a single structured output.
in progressdata
Developer Utilities
- new
Learn Anything
Generate an interactive lesson from any topic with concepts, examples, visual explanations, progress tracking, and quick quizzes.
Open toolutility - essential
Token Counter
Count tokens and estimate costs for various OpenAI models with real-time pricing.
Open toolutility - essential
Zod Generator
Generate Zod schema from interface or type.
Open toolutility Base64 Encoder/Decoder
Encode or decode Base64 strings and files for web, APIs, or cryptographic use.
Open toolutility- new
Secret Scanner
Scan code, config and logs for leaked API keys and credentials using provider patterns and entropy.
Open toolutility Hash Generator
Generate hash values for strings or files using various algorithms.
Open toolutilityJWT Decoder
Decode and inspect JWT tokens to view header, payload, and signature info.
Open toolutility- essential
QR Code Generator
Generate QR codes from text or URLs for sharing or scanning.
Open toolutility Regex Tester
Test regular expressions and preview matches in real-time.
Open toolutilityUnix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
Open toolutility- new
Cron Expression Generator
Generate cron expressions with ease and convert them to human-readable format.
Open toolutility - essential
UUID Generator
Generate random UUID v4 identifiers for unique references or database keys.
Open toolutility - essential
SEO Analyzer
Analyze your website's SEO, performance, and accessibility with Google Lighthouse integration.
Open toolutility - soon
Code Formatter
Format and beautify your code with support for multiple languages.
in progressutility
Visual Creation
- essential
Chart Generator
Generate beautiful charts from data and export as image, you can have multiple charts in one image.
Open toolvisual - new
SVG Animator
Convert lucide svg to animated svg
Open toolvisual - new
Indian Map
Generate interactive choropleth maps for India using our Choropleth Map Tool.
Open toolvisual Color Palette
Generate color palettes from a single color
Open toolvisual- new
Open Graph Image Generator
Design a 1200x630 og:image from ten templates, preview it on WhatsApp and Telegram, then download it or host it behind a URL.
Open toolvisual - new
Social Card Preview
See how a link unfurls on WhatsApp, Telegram, X, Facebook, LinkedIn, Slack, Discord and Google, and fix the tags.
Open toolvisual - new
Table Manager
Import, edit, and manage your data effortlessly — supports JSON, CSV, and web table scraping with powerful editing tools. Maximum 25 rows per page for large files
Open toolvisual Markdown Preview
Preview markdown content in real-time.
Open toolvisual- soon
Markdown to HTML
Convert markdown text to HTML. Useful for previews and CMS rendering.
in progressvisual - soon
Image to Base64
Upload an image and get its Base64-encoded string instantly.
in progressvisual - soon
Lorem Ipsum Generator
Generate placeholder text for UI mocks, wireframes, or demos.
in progressvisual
API Development
- essential
Email Validator
Validate email addresses for correct syntax and domain existence to ensure deliverability.
Open toolapi - new
API Test Simulator
Test API endpoints and measure latency, response time, and error rates.
Open toolapi - new
API to Models
Convert your API responses or OpenAPI/Swagger specifications into TypeScript types, Zod schemas, and Prisma models with a single click.
Open toolapi - essential
Webhook Tester
Simulate webhook calls with presets, retries, headers, signatures, and more.
Open toolapi Phone Validator
Validate and format phone numbers in international standard (E.164).
Open toolapi- new
OpenAPI Explorer
Browse an OpenAPI or Swagger spec, resolve refs, validate it, and generate realistic mock payloads.
Open toolapi
