# Instant Tools > Free, browser-based online utilities. 27 tools including 6 Gemini-powered features, an LLM cost calculator, prompt/rules linter, JSON-to-Zod/schema inference, llms.txt generator, OpenAPI-to-tool-schemas, Cursor rules, OpenAPI-to-MCP, MCP tool checker, plus a local EXIF viewer. Most non-AI tools process data 100% client-side; files never leave the user's device. Operated by an independent developer. No accounts, no signups, no upload limits. Gemini AI tools route through Google's API for analysis only. No storage. ## AI-powered tools - [LLM Cost Calculator](https://instanttools.io/tools/llm-cost-calculator): Compare OpenAI, Anthropic, Gemini, and DeepSeek API token costs from tokens or pasted text. Cache hits and batch discounts. 100% browser-side. - [Screenshot to Code](https://instanttools.io/tools/screenshot-to-code): Convert UI screenshots to HTML+Tailwind, React+Tailwind, Vue SFC, or vanilla HTML/CSS. Live preview for HTML. Free, no signup. - [Handwriting to Text](https://instanttools.io/tools/handwriting-to-text): AI OCR for handwritten notes, whiteboards, and math. Output plain text, Markdown, or LaTeX. Stronger than basic Tesseract free tools. - [AI Alt Text Generator](https://instanttools.io/tools/alt-text-generator): Generate alt text in SEO, accessibility, social, or decorative modes. Returns plain text, HTML `alt=""`, and Markdown together. - [AI Content Detector](https://instanttools.io/tools/ai-content-detector): Detect whether text was written by AI or a human. Returns probability score, confidence level, key indicators, and reasoning. Works on ChatGPT, Claude, Gemini, and GPT-5 outputs. - [AI Resume Analyzer](https://instanttools.io/tools/ai-resume-analyzer): ATS optimization scoring and feedback. Four preset templates (comprehensive, ATS-focused, content quality, format review). Paste text or upload .txt/.doc/.docx. - [AI Image Analyzer](https://instanttools.io/tools/ai-image-analyzer): Analyze any photo with a customizable prompt. Preset modes for professional profile, LinkedIn photo, dating profile, and headshot review. Drag-drop or paste from clipboard. ## Document tools - [PDF Tools](https://instanttools.io/tools/pdf-tools): Merge multiple PDFs into one, or split a PDF into individual pages. 100% client-side via pdf-lib. - [CSV Cleaner](https://instanttools.io/tools/csv-cleaner): Clean and format CSV files: remove duplicates, trim whitespace, normalize case, select columns. Export as CSV or JSON. - [JSON Formatter](https://instanttools.io/tools/json-formatter): Format, beautify, minify, and validate JSON. Syntax error detection with line numbers. - [Text Diff Checker](https://instanttools.io/tools/text-diff): Side-by-side and unified diff views. Uses the Myers algorithm (same as Git). ## Developer tools - [OpenAPI to MCP Server](https://instanttools.io/tools/openapi-to-mcp): Convert OpenAPI/Swagger specs into Model Context Protocol servers for Cursor and Claude Desktop. TypeScript or Python. Agent readiness score. 100% browser-side. - [OpenAPI to Tool Schemas](https://instanttools.io/tools/openapi-to-tool-schemas): Convert OpenAPI/Swagger into Zod, JSON Schema, OpenAI function tools, and Anthropic input_schema tools. 100% browser-side. - [JSON to Zod & Schema](https://instanttools.io/tools/json-to-schema): Infer Zod validators and JSON Schema from example JSON (optional description/prompt notes). 100% browser-side. - [llms.txt Generator](https://instanttools.io/tools/llms-txt-generator): Generate an llms.txt file for AI crawlers from curated links or a pasted sitemap. 100% browser-side. - [MCP Tool Checker](https://instanttools.io/tools/mcp-tool-checker): Score MCP tools/list, OpenAI/Anthropic tool schemas, or OpenAPI for agent readiness (descriptions, naming, safety, context size). Markdown report. 100% browser-side. - [Cursor Rules Generator](https://instanttools.io/tools/cursor-rules-generator): Generate Cursor .cursor/rules .mdc files, AGENTS.md, CLAUDE.md, and legacy .cursorrules from stack presets. MCP-aware extras. 100% browser-side. - [Prompt & Rules Linter](https://instanttools.io/tools/prompt-rules-linter): Lint system prompts, AGENTS.md, CLAUDE.md, and Cursor rules for clarity, safety, contradictions, and actionability. Markdown report. 100% browser-side. - [Base64 Encoder/Decoder](https://instanttools.io/tools/base64): Encode/decode text or files to Base64. Optional URL-safe variant. Supports data-URI generation for images. - [Hash Generator](https://instanttools.io/tools/hash-generator): Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files. - [UUID Generator](https://instanttools.io/tools/uuid-generator): Generate UUIDs in v1 (timestamp) or v4 (random) formats. Multiple output formats (uppercase, no-hyphens, brackets). - [URL Encoder/Decoder](https://instanttools.io/tools/url-encoder): Percent-encode and decode URL components. ## Image tools - [Image Converter](https://instanttools.io/tools/image-converter): Convert between PNG, JPG/JPEG, WebP, GIF, BMP. Batch conversion supported. Quality control for lossy formats. - [EXIF Viewer & Metadata Remover](https://instanttools.io/tools/exif-viewer): View EXIF (camera, GPS, timestamps), open GPS in Google Maps, strip metadata and download a clean image. 100% local. No upload. - [QR Code Generator](https://instanttools.io/tools/qr-generator): Generate QR codes for text, URLs, WiFi credentials, and vCard contacts. Customizable size, error correction (L/M/Q/H), and download as PNG or SVG. - [Color Palette Generator](https://instanttools.io/tools/color-palette): Generate palettes: complementary, analogous, triadic, monochromatic, or random. Lock individual colors. Copy as HEX, RGB, or HSL. - [Password Generator](https://instanttools.io/tools/password-generator): Generate cryptographically random passwords. Configurable length, character types, exclude-similar/ambiguous options. ## Hub pages - [AI Tools hub](https://instanttools.io/ai-tools): Overview of all AI-powered tools. - [Document Tools hub](https://instanttools.io/document-tools): Overview of PDF, CSV, JSON, and diff tools. - [Developer Tools hub](https://instanttools.io/developer-tools): Overview of encoding, hashing, and ID generation tools. - [Image Tools hub](https://instanttools.io/image-tools): Overview of image conversion, EXIF, QR, and palette tools. - [All Tools](https://instanttools.io/tools): Index of every category. ## Policies - [About](https://instanttools.io/about): Mission and project background. - [Privacy Policy](https://instanttools.io/privacy): What is and is not processed server-side. - [Terms of Service](https://instanttools.io/terms): Acceptable use.