The ToolShack App Library

Generate highly specific LLM prompts that produce accurate, well-structured documentation for JavaScript, Python, Go, Java, and C# codebases. This tool crafts constrained prompts that force language models to output properly formatted JSDoc, PyDoc, JavaDoc, GoDoc, or C# XML comments without conversational fluff. Perfect for developers who want clean, consistent documentation without manually writing every docstring.

Decode Base64 encoded strings back to their original text format or encode plain text into Base64 format instantly. This free online tool runs entirely in your browser for complete privacy, making it ideal for developers, security professionals, and anyone working with encoded data. No signup required and no data is ever sent to a server.

Encode text to Base64 or decode Base64 strings instantly with this free online converter. Supports both text and file-based conversion with a clean, intuitive interface. All processing happens in your browser for maximum privacy, so sensitive data never touches a server. Perfect for developers embedding assets, encoding API credentials, or working with data URIs.

Generate secure Bcrypt hashes from plaintext passwords or verify if a password matches an existing hash. This free online tool lets you customize the work factor rounds to balance security and performance. All hashing happens locally in your browser using the Web Crypto API, so your passwords are never transmitted over the network. Ideal for developers building authentication systems.

Convert binary code to human-readable text and encode text back to binary instantly. This free online tool is designed for developers, students, and electronics enthusiasts who need quick binary-to-ASCII conversion. All processing runs locally in your browser with no server uploads, ensuring your data stays private. Supports both 8-bit and space-separated binary formats.

Convert text between uppercase, lowercase, title case, camelCase, PascalCase, snake_case, and kebab-case instantly with this free online tool. Perfect for developers normalizing variable names, writers formatting titles, or anyone who needs quick text case transformation. Runs entirely in your browser for privacy, handles special characters and numbers correctly, and supports batch conversion of multiple lines at once.

Convert messy OpenAI conversations.json data exports into beautifully styled, readable HTML chat documents. This tool transforms the raw JSON dump from ChatGPT into clean, searchable, and shareable HTML pages with proper formatting for user and assistant messages. Also supports pasted raw chat text from Claude and Gemini. Everything is parsed locally in your browser for complete privacy.

Convert color formats between HEX, RGB, RGBA, HSL, and HSLA instantly with this free online tool. Perfect for web designers, frontend developers, and UI/UX professionals who frequently work with different color systems. Features an interactive color picker for visual selection and displays all format variations simultaneously. All conversions happen locally in your browser with no data sent to external servers.

Extract a curated color palette from any image with this free online tool. Upload a photo, screenshot, or design mockup and instantly get the dominant colors as HEX codes and CSS custom properties. Perfect for designers creating brand palettes from inspiration images, developers matching UI colors to reference screenshots, or anyone who needs to identify exact colors from visual assets. All processing happens in your browser.

Generate beautiful, harmonious color palettes instantly with this free online tool. Press the spacebar to randomize new palettes, lock colors you love, and export your creation as CSS, JSON, or SCSS variables. Perfect for designers exploring color schemes, developers building design systems, or anyone seeking color inspiration. Features accessibility contrast checks and works entirely in your browser for privacy.

Parse, validate, and convert complex Cron expressions into human-readable text with this free online tool. Perfect for DevOps engineers, system administrators, and developers who need to quickly understand or build scheduled task expressions. Enter a cron expression to see the next 5 run times, get a natural language description, and validate your syntax. Works entirely in your browser for instant results.

Minify and compress your CSS code instantly with this free online optimizer. Remove unnecessary whitespace, comments, line breaks, and redundant characters to reduce file size and improve website loading speed. Perfect for web developers optimizing production assets. All processing happens locally in your browser, so your source code is never uploaded to any server. Results are available with one-click copy.

Instantly convert spreadsheet CSV data into a clean JSON array structure with this free online converter. Paste your comma-separated values or upload a CSV file and get properly formatted JSON output with headers as keys. Perfect for developers importing data into APIs, analysts transforming spreadsheet exports, or anyone working with data interchange formats. All conversion runs locally in your browser for complete privacy.

Create beautiful CSS linear, radial, and conic gradients visually with an intuitive color stop editor. Customize angles, directions, and multiple color stops to generate ready-to-use CSS code instantly. Perfect for web designers, frontend developers, and anyone building visually appealing backgrounds for websites, landing pages, and UI components without writing gradient syntax from scratch.

Generate cryptographic hashes from text or files using MD5, SHA-1, SHA-256, and SHA-512 algorithms instantly. Essential for developers, security professionals, and system administrators who need to verify data integrity, create digital signatures, or hash passwords. All hashing runs locally in your browser with zero data transmission, ensuring complete privacy.

Convert special characters to HTML entities or decode HTML entities back to raw text instantly. Essential for web developers working with dynamic content, preventing XSS vulnerabilities, and ensuring proper character rendering across different browsers and character encodings. Supports named entities like < and numeric Unicode entities with 100% client-side processing.

Minify and compress HTML code by removing comments, whitespace, unnecessary attributes, and redundant tags to reduce file size and improve page load speed. Ideal for web developers and site owners optimizing production websites. The tool preserves all functionality while stripping non-essential characters, with results generated entirely in your browser.

Upload any image and click anywhere on it to extract the exact color at that pixel. Get HEX, RGB, and HSL values instantly with a growing palette of picked colors. Perfect for designers who need to match brand colors from screenshots, developers building UIs from mockups, or anyone who wants to identify a specific color from a photo or design.

Compress and optimize images instantly by reducing file size while maintaining visual quality. Supports JPEG, PNG, and WebP output formats with adjustable quality settings. Perfect for web developers, content creators, and site owners who need faster page loads and lower bandwidth usage without manually configuring complex image optimization pipelines.

Crop images to exact dimensions using an interactive drag-to-select interface. Includes preset aspect ratios for social media profiles, banners, and common print sizes. Ideal for designers, content creators, and developers who need precise image cropping without heavy desktop software. All processing runs locally in your browser with zero server uploads.

Apply professional-grade filters and adjustment effects to your photos directly in the browser. Choose from preset filters like Grayscale, Sepia, Vintage, and Dramatic, or fine-tune brightness, contrast, saturation, and blur manually. Great for social media content creators, bloggers, and anyone who needs quick photo enhancements without installing desktop editing software.

Flip images horizontally or vertically to create mirror effects instantly in your browser. Useful for correcting mirrored selfies, creating symmetric designs, or adjusting product photos for e-commerce listings. Supports all common image formats with one-click flip actions and instant download, all processed locally without any server uploads.

Convert images between PNG, JPG, WebP, GIF, and BMP formats instantly with adjustable quality settings. Perfect for web developers optimizing assets, designers switching between transparent and opaque formats, or anyone needing a specific image format without installing software. All conversions happen locally in your browser for complete privacy and speed.

Resize images to custom dimensions or choose from common presets for social media, web banners, and print sizes. Maintain aspect ratio or stretch to exact pixel dimensions. Perfect for preparing images for Instagram posts, LinkedIn banners, email headers, and web layouts. All resizing happens locally in your browser without uploading to any server.

Rotate images by 90, 180, or 270 degrees or enter a custom angle to fix tilted or sideways photos instantly. Essential for correcting orientation issues from scanned documents, phone camera rotations, or imported media. Works entirely in your browser with no server uploads, supporting all common image formats for instant download.

Convert any image to a Base64-encoded string for embedding directly into HTML, CSS, or JSON files without separate HTTP requests. Useful for inline email signatures, small icon assets, and data URIs in web applications. Processes files entirely in your browser with zero server uploads, ensuring your images remain completely private.

Convert one or more images into a single PDF document with drag-and-drop reordering. Supports PNG, JPG, WebP, and GIF input formats with adjustable page sizes and margins. Perfect for creating photo albums, scanning documents from phone photos, or bundling receipts for expense reports — all processed locally in your browser.

Convert JPG and JPEG images to lossless PNG format instantly in your browser. PNG offers transparency support and higher quality retention, making it ideal for logos, icons, screenshots, and images requiring alpha channels. All conversions happen locally with zero server uploads, ensuring complete privacy for your photos and sensitive images.

Minify and compress JavaScript code by removing whitespace, comments, shortening variable names, and eliminating dead code to reduce file size and improve page load speed. Essential for frontend developers deploying production bundles where every kilobyte matters. The tool runs entirely in your browser with no code uploaded to any server.

Format, validate, and beautify JSON data instantly with syntax highlighting and error detection. Converts minified JSON into readable, indented output and provides real-time validation with line-specific error messages. Essential for developers working with APIs, configuration files, and data payloads who need to quickly inspect and clean up JSON structures.

Convert standard JSON arrays into valid JSONL (JSON Lines) format required for AI model fine-tuning. Supports OpenAI Chat format, Legacy Completions format, and raw flattening for flexible data preparation. Ideal for machine learning engineers and AI researchers preparing training datasets without writing custom Python scripts. All processing stays in your browser.

Decode and inspect JSON Web Tokens (JWT) instantly to view the header, payload, and signature sections in a formatted, readable layout. Essential for developers debugging authentication flows, verifying token claims, and understanding JWT structure without installing CLI tools. All decoding happens locally in your browser with zero data sent to any server.

Generate realistic placeholder text for your design layouts and mockups instantly. This free online Lorem Ipsum generator creates professional-quality dummy text in words, sentences, or paragraphs. Perfect for web designers, developers, and content creators who need to fill spaces with natural-looking text without distracting content. Customize the exact quantity of text you need, from a single word to dozens of paragraphs, all generated client-side for complete privacy.

Write markdown and see a real-time rendered HTML preview side by side. This free online Markdown to HTML converter provides a split-pane editor that instantly transforms your markdown syntax into clean, ready-to-use HTML. Perfect for developers, technical writers, and content creators who need to preview formatting as they type. Copy the generated HTML directly or export it for use in blogs, emails, documentation, or web applications — all processed locally in your browser for complete privacy.

Visually build complex Midjourney v6 prompts with an intuitive parameter builder. Set aspect ratios, stylize values, chaos levels, and negative prompts without memorizing confusing syntax commands. This free online Midjourney prompt generator helps AI artists craft precise, optimized prompts that produce stunning results. Whether you are a beginner learning prompt structure or an experienced user fine-tuning parameters, this tool streamlines the workflow and eliminates syntax errors that waste your generation credits.

Generate strong, cryptographically random passwords instantly with this free online password creator. Customize password length from 8 to 128 characters, toggle uppercase, lowercase, numbers, and special symbols to meet any security requirement. Perfect for developers, security-conscious users, and anyone tired of reusing weak passwords. Uses the Web Crypto API for true randomness, ensuring your passwords are resistant to brute-force attacks. Generate unlimited passwords completely free, with zero data transmitted — everything runs locally in your browser.

Reduce PDF file size instantly with adjustable compression levels using this free online PDF compressor. Choose from multiple quality presets to balance file size reduction with visual fidelity. Ideal for sharing documents via email, uploading to websites, or meeting attachment size limits. All compression happens directly in your browser using client-side JavaScript — your PDFs are never uploaded to any server. Fast, private, and completely free with no file size restrictions for everyday use.

Combine multiple PDF files into a single document directly in your browser with this free online PDF merger. Drag and drop to upload, reorder pages by dragging, and merge unlimited PDFs with no file size restrictions. Perfect for consolidating reports, combining contracts, or organizing scattered document pages. Everything processes locally using client-side JavaScript — your sensitive documents never leave your device. No signup, no watermarks, no branding — just a clean merged PDF ready to download instantly.

Split and extract specific pages or page ranges from PDF documents instantly with this free online PDF splitter. Select individual pages or define custom ranges to extract exactly what you need from large PDF files. Ideal for separating chapters, extracting signed pages, or sharing only relevant sections of a document. All processing happens entirely in your browser using client-side JavaScript — your PDFs never leave your device. No signup required, no watermarks, and extracted pages maintain the original quality.

Convert PDF pages to high-quality PNG or JPG images instantly with this free online PDF to image converter. Upload a PDF and download individual pages as image files, perfect for sharing specific pages on social media, embedding in presentations, or extracting visual content. Choose between PNG for lossless quality or JPG for smaller file sizes with adjustable quality. All conversion happens entirely in your browser — your PDFs are never uploaded to any server, ensuring complete privacy and security.

Instantly calculate percentages, percentage increases, decreases, and differences with this free online percentage calculator. Whether you need to figure out a tip, calculate a discount, determine what percentage one number is of another, or find the percentage change between two values — this tool handles it all with precision. Features a clean, intuitive interface that shows results in real-time as you type. Perfect for students, professionals, and anyone who needs quick, accurate percentage calculations without a spreadsheet.

Convert PNG images to JPG format instantly with this free online PNG to JPG converter. Reduce file size while maintaining visual quality — ideal for photos and graphics that do not require transparency. Adjust the JPG quality slider to balance between file size and image fidelity. Batch convert multiple PNG files at once for maximum efficiency. All conversion happens entirely in your browser using client-side JavaScript, ensuring your images are never uploaded to any server. Fast, private, and requires no signup.

Convert PNG images to the modern WebP format to significantly reduce file sizes while maintaining excellent visual quality. This free online PNG to WebP converter produces next-generation images that load faster on websites and applications — WebP typically achieves 25-35% smaller file sizes than PNG with comparable quality. Perfect for web developers optimizing site performance, bloggers reducing upload sizes, and anyone looking to save bandwidth. All conversion runs entirely in your browser with zero server uploads for complete privacy.

Reduce your GPT, Claude, and Gemini API costs by compressing your prompts before sending them. This free online AI prompt compressor safely strips out LLM stop words, redundant whitespace, and empty spaces to slash your token footprint without sacrificing model comprehension. Ideal for developers running high-volume API calls, researchers optimizing training data, and anyone looking to cut LLM expenses. Supports both GPT-4 and Claude tokenization models, giving you accurate token counts and cost estimates. All processing happens locally — your prompts never leave your browser.

Secure your PDF files by adding password protection with industry-standard AES-256 encryption using this free online tool. Protect sensitive contracts, financial documents, and private records from unauthorized access by setting a strong password. All encryption happens entirely in your browser using client-side JavaScript — your PDFs are never uploaded to any server, ensuring complete confidentiality. The protected PDF maintains its original formatting and content while requiring the password to open. Simple, fast, and completely private.

Generate custom QR codes instantly with this free online QR code maker. Encode URLs, text, email addresses, phone numbers, WiFi credentials, and vCards into scannable QR codes. Customize foreground and background colors, adjust size, and set error correction levels for reliable scanning. Download high-quality PNG files ready for print or digital use. Perfect for marketers, event organizers, and businesses who need professional QR codes without design software. All generation happens locally in your browser — no data is sent to any server.

Slice massive documents into properly overlapping token arrays for vector databases like Pinecone, Weaviate, or ChromaDB using this free online RAG text chunker. Uses the exact Tiktoken (cl100k_base) algorithm via WebAssembly to count tokens with precision, then splits your text into optimally sized chunks with configurable overlap to prevent context loss. Essential for anyone building Retrieval-Augmented Generation pipelines who needs properly formatted input for embedding models. All processing happens locally in your browser — your proprietary documents never leave your device.

Test, build, and debug regular expressions (regex) instantly with this free online regex tester. Enter your pattern and test string to see real-time match highlighting that shows exactly what your regex captures. Supports JavaScript regex syntax with toggles for global, case-insensitive, multiline, and dotAll flags. Perfect for developers, data analysts, and anyone who needs to validate or refine regex patterns without writing code. Features a clean split-pane interface with instant feedback as you type. All testing happens locally in your browser — no data is sent to any server.

Fix orientation issues in your PDF documents instantly with this free online PDF rotation tool. Rotate individual pages or entire documents by 90, 180, or 270 degrees to correct upside-down scans, sideways receipts, or misaligned pages. Perfect for cleaning up scanned documents, fixing camera-captured PDFs, and ensuring your documents display correctly on any device. All processing happens entirely in your browser using client-side JavaScript — your PDFs are never uploaded to any server. The rotated PDF maintains its original quality and formatting.

Format, beautify, and organize messy SQL queries online. This tool automatically indents keywords, aligns clauses, and structures your raw or minified SQL into clean, readable code. It supports Standard SQL, PostgreSQL, MySQL, and SQLite dialects. Perfect for developers, database administrators, and data analysts who need to quickly make sense of complex or auto-generated queries. All formatting is performed locally in your browser for complete privacy.

Perfectly format Stable Diffusion prompts with correct weighted syntax for Automatic1111 and ComfyUI workflows. This tool automatically applies keyword emphasis weights using parentheses notation, structures negative prompts, and lets you configure CFG scale and sampler settings visually. Ideal for AI artists and prompt engineers who want to create high-quality SD images without memorizing complex syntax rules. Everything runs in your browser to keep your creative prompts private.

Clean up and optimize your Scalable Vector Graphics (SVG) files safely in your browser. This tool strips unnecessary metadata, removes editor-specific tags, collapses paths, and reduces node counts to significantly shrink file sizes without altering the visual output. Essential for web developers and designers who need lightweight SVGs for faster page loads and smaller bundle sizes. All optimization runs entirely client-side so your vector assets stay private.

Create highly optimized structural AI system prompts iteratively to enhance ChatGPT, Claude, and Gemini outputs. This tool guides you through building prompts with strict guardrails, role definitions, and output constraints using proven prompt engineering techniques. Perfect for developers building AI-powered apps, content creators, and researchers who need consistent, high-quality LLM responses. All prompt construction happens locally in your browser to protect your proprietary strategies.

Compare two text documents or code snippets side by side to find differences instantly. This diff tool highlights additions, deletions, and modifications with clear color-coded markers, making it easy to spot what changed between versions. Ideal for developers reviewing code changes, writers proofreading revisions, or anyone who needs to verify document edits. The entire comparison runs locally in your browser, ensuring your sensitive text never leaves your device.

Convert Unix Epoch timestamps to human-readable dates and back again with this free online converter. It supports both seconds and milliseconds, automatically detects the input format, and displays results in both your local time zone and UTC. Essential for developers debugging API responses, system administrators analyzing logs, and anyone working with time-stamped data. All conversions happen instantly in your browser with no data sent to any server.

Calculate GPT-4, Claude, and Gemini tokens instantly without sending data to a server. This tool uses the official tiktoken algorithm via WebAssembly to count tokens locally in your browser, then displays estimated API costs across major LLM pricing tiers. Perfect for developers optimizing prompts, managing API budgets, and comparing model costs before sending requests. Your text is never uploaded, making it safe for proprietary and sensitive content.

Convert units of length, weight, and temperature instantly with this free online measurement converter. Switch between metric and imperial systems for meters, feet, kilograms, pounds, Celsius, Fahrenheit, and Kelvin with precise calculations. Perfect for students, engineers, travelers, and anyone who needs quick and accurate unit conversions. The tool runs entirely in your browser with no data sent to external servers, ensuring your calculations stay private.

Encode and decode URLs instantly to convert special characters into URL-safe percent-encoded format or reverse the process. This tool handles query parameters, path segments, and full URLs, making it essential for web developers building API integrations, debugging redirects, or working with complex query strings. All encoding and decoding is performed locally in your browser, so your URL data never reaches an external server.

Parse and extract structured data from complex URLs instantly. This tool breaks down any URL into its constituent parts — protocol, hostname, port, path, query parameters, and fragment — and displays them in a clear, organized table. Ideal for web developers debugging routing issues, SEO analysts inspecting URL structures, and anyone who needs to understand the anatomy of a web address. All parsing runs locally in your browser for complete privacy.

Generate v1 (timestamp-based) and v4 (random) UUIDs instantly with this free online tool. Create single UUIDs or batch-generate multiple unique identifiers at once for database primary keys, API tokens, session IDs, and distributed system references. The tool uses the Web Crypto API to ensure cryptographically secure randomness for v4 UUIDs. All generation happens locally in your browser, so your identifiers are never stored or transmitted externally.

Convert images to WebP format or export WebP files to PNG and JPG with this free online converter. WebP offers superior compression compared to traditional formats, reducing file sizes by up to 35% while maintaining visual quality. This tool provides adjustable quality settings and supports batch conversion of multiple files. Perfect for web developers optimizing site performance and designers preparing assets for modern web delivery. All conversions run locally in your browser.

Convert WEBP images to PNG format instantly with this free online converter. The conversion is completely lossless, preserving the original image quality and transparency while producing universally compatible PNG files. Ideal for designers, developers, and content creators who need to convert modern WebP assets for use in tools or platforms that do not yet support the WebP format. All conversion is performed locally in your browser for total privacy.

Count words, characters, sentences, and paragraphs in your text instantly with this free online analysis tool. It provides real-time statistics as you type, making it perfect for writers meeting word limits, students working on essays, social media managers crafting posts, and SEO professionals optimizing content length. The tool runs entirely in your browser, so your text content is never sent to any server or stored anywhere.

Format, beautify, and validate XML data with this free online tool. It automatically adds proper indentation, line breaks, and syntax highlighting to messy or minified XML strings, making them readable and easy to debug. The tool also validates your XML and reports errors with line numbers for quick fixes. Essential for developers working with configuration files, API responses, or SOAP services. All formatting runs locally in your browser to keep your data private.

Compare two text snippets side by side and instantly highlight every addition, deletion, and modification with clear color-coded markers. This free online diff checker uses a reliable LCS algorithm to find the longest common subsequence, producing accurate and readable comparisons. Ideal for developers reviewing code changes, writers proofreading document revisions, or anyone verifying edits across two versions. The entire comparison runs locally in your browser, ensuring sensitive text never leaves your device.

Generate a complete set of favicon files for your website from a single image or text input. This free online favicon generator creates all required sizes — 16x16, 32x32, 48x48, 192x192, and 512x512 — and packages them into a downloadable ZIP archive with an auto-generated HTML snippet for your head tag. Ideal for web developers and designers who need professional favicons without installing desktop software. All image processing happens entirely in your browser using the Canvas API — your source image never leaves your device.

Convert JSON arrays of objects into clean, properly escaped CSV files instantly with this free online converter. Handles nested objects by flattening them into dot-notation column headers, supports custom delimiters (comma, semicolon, tab), and generates downloadable CSV files ready for Excel, Google Sheets, or any data analysis tool. Perfect for developers, data analysts, and anyone who needs to export structured JSON data into spreadsheet format. All conversion happens entirely in your browser — your data never leaves your device.

Convert between CSS units instantly with this free online converter. Switch between pixels, rem, em, percentages, viewport width, viewport height, and more with real-time calculations. Set your root font size to get accurate rem conversions, and see the viewport-responsive equivalent for each value. Essential for web developers and designers building responsive layouts who need to quickly translate between unit systems. All conversions happen locally in your browser with zero data upload.

Simulate how your designs appear to people with different types of color vision deficiency using this free online accessibility tool. Test any color against 8 types of color blindness — protanopia, deuteranopia, tritanopia, achromatopsia, and more — to ensure your interfaces are accessible to everyone. Choose colors via the color picker or paste hex, RGB, or HSL values. Essential for UX designers, frontend developers, and anyone building inclusive digital products. All simulation happens locally in your browser with zero data upload.

Check color contrast ratios for WCAG 2.1 accessibility compliance. Test foreground and background color combinations against AA and AAA standards with live preview. All processing happens in your browser.