Tools Directory
Browse every Execute.Online utility in one indexable directory. Each tool has a dedicated prerendered page with practical usage notes, FAQs, related tools, and privacy-first browser-side processing details.
11 tools
Free online JSON formatter. Format, validate, minify and convert JSON to YAML, XML or CSV instantly. No upload — runs entirely in your browser.
Searches: json formatter, json validator, json beautifier
Convert JSON to TypeScript interfaces, type aliases, or Zod schemas instantly. Handles nested objects, arrays, optional fields, and nulls in your browser.
Searches: json to typescript, json to typescript interface, json to interface online
Convert cURL commands to fetch, axios, or Python requests code instantly. Build and test HTTP requests with headers, auth, and body. Free API tool.
Searches: curl to fetch, curl converter online, http request builder
Free online base converter. Convert text between hex, binary, base32, base58, base62 and more encoding schemes. Instant results in your browser.
Searches: base converter online, hex to text, text to hex
Free online text tools. Count words and characters, convert case, sort and deduplicate lines. Instant browser-side text processing.
Searches: word counter online, character counter, text case converter
Free online Markdown editor with live preview. Write and preview GitHub Flavored Markdown, export to HTML, and check reading time instantly.
Searches: markdown preview online, markdown editor online, markdown to html
Free online CSV converter. Convert CSV to JSON, SQL INSERT statements, HTML table, and Markdown table. Also convert JSON back to CSV. No server upload.
Searches: csv to json online, csv converter online, csv to sql
Free Unix timestamp converter. Convert Unix timestamps to human-readable dates and vice versa. Live current timestamp, timezone support, and relative time.
Searches: unix timestamp converter, timestamp to date, epoch converter
Free online YAML to JSON and JSON to YAML converter. Paste any YAML or JSON and get an instant conversion. Runs entirely in your browser.
Searches: yaml to json online, json to yaml converter, yaml converter online
Complete HTTP status code reference. All 1xx–5xx codes explained with descriptions, use cases, and searchable table. Bookmark this developer cheatsheet.
Searches: http status codes, http error codes list, http 404 not found
Free online number base converter. Convert between binary, octal, decimal, and hex. Visualize IEEE 754 single and double precision floating-point representation.
Searches: binary to decimal converter, hex to decimal converter, number base converter online
6 tools
Free online Base64 encoder and decoder. Encode text or files to Base64 and decode Base64 strings instantly in your browser. Supports URL-safe Base64.
Searches: base64 encoder online, base64 decoder online, base64 encode online
Free online URL encoder and decoder. Encode special characters for safe URL use and decode percent-encoded strings. Includes query string parser.
Searches: url encoder online, url decoder online, urlencode online
Free online HTML entity encoder and decoder. Convert special characters to &, <, > and decode HTML entities back to plain text.
Searches: html encode online, html entity encoder, html decoder online
Free online string case converter. Instantly convert between camelCase, snake_case, PascalCase, kebab-case, SCREAMING_SNAKE, and more naming conventions.
Searches: camelcase to snakecase, string case converter, camelcase converter online
Free online URL slug generator. Convert titles and text to clean, SEO-friendly URL slugs. Handles accented characters, special symbols, and bulk conversion.
Searches: slug generator online, url slug maker, seo slug generator
Free Lorem Ipsum generator. Generate classic, hipster, or corporate placeholder text in words, sentences, or paragraphs. HTML and Markdown output supported.
Searches: lorem ipsum generator, placeholder text generator, dummy text generator
8 tools
Free online regular expression tester. Test regex patterns against strings in real-time, see highlighted matches, and explore common regex patterns.
Searches: regex tester online, regular expression tester, regex debugger online
Free online code formatter and beautifier. Format, minify and prettify JavaScript, TypeScript, CSS, HTML, and JSON instantly in your browser.
Searches: code formatter online, javascript beautifier, css formatter online
Free online diff checker. Compare two texts side-by-side and see differences highlighted. Supports text, code, JSON, and file uploads.
Searches: diff checker online, text compare online, compare two texts
Free online cron expression builder. Create and test cron schedules visually, get plain English descriptions, and see next scheduled run times.
Searches: cron builder online, cron expression tester, cron generator online
Free online SQL formatter. Beautify and format SQL queries with keyword casing options and configurable indentation. Supports SELECT, INSERT, UPDATE, DELETE, JOINs.
Searches: sql formatter online, sql beautifier, format sql online
Free online subnet calculator. Enter CIDR notation to get network address, broadcast, subnet mask, usable hosts, binary representation and more.
Searches: subnet calculator online, cidr calculator, ip subnet calculator
Free meta tag preview tool. See how your page looks in Google search results, Facebook Open Graph shares, and Twitter cards before you publish.
Searches: meta tag preview, open graph preview, twitter card preview
Free online .env file parser. Parse environment variable files, view values in a table, detect sensitive variables, and export as JSON or shell export statements.
Searches: env file parser, dotenv parser online, parse env file
4 tools
Free online cryptography tools. Generate SHA-256/512 hashes, Bcrypt password hashes, and RSA key pairs entirely in your browser.
Searches: sha256 generator online, bcrypt generator online, rsa key generator online
Free online JWT decoder and encoder. Decode and inspect JSON Web Tokens instantly. View header, payload, claims, and expiry. Encode new JWTs with HS256.
Searches: jwt decoder online, jwt decoder, decode jwt online
Free secure random generator. Generate strong passwords, UUIDs, API keys, WiFi passwords, and random strings with cryptographic randomness.
Searches: password generator online, uuid generator, api key generator
Free online password strength checker. Analyzes entropy, estimated crack time, common patterns, and gives actionable improvement tips. 100% private.
Searches: password strength checker, password strength tester, check password strength online
2 tools
Free online UUID generator. Generate UUID v4, v7, ULID, NanoID, and MongoDB ObjectId instantly. Bulk generate up to 1000 unique IDs.
Searches: uuid generator online, uuid v4 generator, nanoid generator
Free online QR code and barcode generator. Create QR codes for URLs, WiFi, vCard, email and more. Download as PNG or SVG instantly.
Searches: qr code generator online, qr code maker, barcode generator online
1 tools
2 tools
Free online PDF merger. Combine multiple PDF files into one in your browser — no server upload, no file size limits, no account needed.
Searches: merge pdf online, combine pdf files, pdf merger free
Free online image converter. Convert images between PNG, JPG, and WebP formats instantly in your browser. No server upload — full privacy.
Searches: image converter online, png to jpg online, jpg to webp converter
13 tools
Audit AI prompts for goals, context, constraints, output format, success criteria, and agent approval boundaries. Private and browser-based.
Searches: ai prompt optimizer, prompt checker, prompt linter
Split documents into RAG chunks by paragraph, sentence, or word count. Tune overlap, inspect token estimates, and export embedding-ready JSONL.
Searches: rag chunking tool, text chunker for embeddings, document chunking ai
Validate JSONL and chat fine-tuning records line by line. Find malformed messages, normalize valid examples, and download a clean dataset.
Searches: jsonl validator online, fine tuning dataset validator, openai jsonl checker
Convert OpenAPI JSON or YAML operations into strict OpenAI function tools or MCP tool definitions, including parameters and request body schemas.
Searches: openapi to function calling, openapi to openai tools, swagger to ai tools
Validate Model Context Protocol tool definitions, names, descriptions, inputSchema, outputSchema, required properties, and strictness locally.
Searches: mcp tool validator, model context protocol validator, mcp input schema
Compare embedding vectors with cosine similarity, dot product, Euclidean distance, magnitudes, dimension checks, and L2 normalization.
Searches: cosine similarity calculator, embedding vector comparison, vector similarity online
Compare two AI responses using reference coverage, structure, concision, uncertainty, token estimates, and lexical-overlap signals.
Searches: compare llm outputs, llm eval tool, ai response comparison
Redact emails, phones, IPs, JWTs, API keys, passwords, tokens, card-like numbers, and custom terms before sharing context with AI.
Searches: ai data redactor, remove pii from text, redact api keys
Prioritize context blocks, reserve output tokens, fit evidence into a model context window, and see what is included, truncated, or excluded.
Searches: context window calculator, ai context packer, token budget tool
Create reusable AI prompt templates with variables, detect missing values, preview rendered prompts, estimate tokens, and export prompt packages.
Searches: prompt template builder, ai prompt variables, prompt template generator
Free BYOK AI chat client. Use your own API key to chat with GPT-4o, Claude, Gemini, and Groq models — private, no middleman, no data stored.
Searches: byok ai client, openai chat client online, gemini chat client
Free AI token counter and cost estimator for GPT-4o, Claude 3, Gemini, and Groq. Plan your API budget before sending prompts.
Searches: token counter ai, ai token estimator, gpt token counter
Free online audio transcription tool. Transcribe and translate audio files using Whisper AI via Groq. Fast, accurate, 57+ languages supported.
Searches: audio transcription online, whisper ai online, audio to text online