Tools
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Tool
FFmpeg video crop
— Generate FFmpeg crop commands by uploading a video file and interactively defining a crop area using a draggable overlay. The tool provides both standard and iPhone-compatible FFmpeg command formats that automatically update as you adjust the crop box dimensions and position. This eliminates the need to manually calculate crop parameters for video editing workflows.
Tool
Hacker News Multi-Term Histogram
— Analyze Hacker News stories by searching for multiple terms across a custom time range and visualize the results as an interactive histogram. The tool fetches monthly hit counts from the Hacker News API for each search term, displaying data in a color-coded bar chart, sortable table, and exportable JSON format. Click any bar to view the actual stories matching that term within that month's date range.
Tool
JSON to Markdown Converter
— Convert JSON transcripts from audio into formatted Markdown with speaker names and timestamps. This tool automatically processes JSON data containing speaker names, text, and timestamp information, formatting them into readable Markdown output that can be easily copied and pasted elsewhere. The tool includes instructions for generating the required JSON format using the LLM command-line tool with audio files.
Tool
Reading Time Estimator
— Calculate reading time estimates for any text by pasting or typing content into the input area. The tool displays real-time statistics including word count, character count, and estimated reading duration based on an average reading speed of 230 words per minute. The reading time adjusts dynamically, showing minutes for shorter texts and hours plus minutes for longer content.
Tool
Multi-Tab Sync Chat
— Send chat messages that synchronize instantly across multiple browser tabs using the Broadcast Channel API. Each tab displays messages sent from other tabs with a sync indicator, allowing real-time communication without requiring a backend server. Open multiple tabs of this page to see messages propagate automatically across all instances.
Tool
Transfer time calculator
— Calculate file transfer duration by entering the file size and transfer speed with their respective units. The calculator automatically converts between different measurement units (GB, MB, TB for file size; Mbps, MB/s, KB/s for speed) and displays the estimated transfer time in an easily readable format. Results include a detailed breakdown showing days, hours, minutes, and seconds alongside the calculation parameters.
Tool
Date Calculator
— Calculate the time between two dates with detailed breakdowns and visual representations. This tool displays the total number of days, weeks, business days, and weekend days spanning your selected date range, along with a visual timeline showing where the dates fall relative to today. Use the calculation method options to focus on specific day types such as business days or weekends only.
Tool
Interactive CSS Flexbox Playground
— Experiment with CSS Flexbox properties in real-time using this interactive playground. Adjust container properties like flex-direction, justify-content, and align-items while watching the layout change instantly, then select individual items to customize their flex-grow, flex-shrink, flex-basis, and alignment settings. The dynamically generated CSS code output shows the exact syntax needed to recreate your layout, making it an effective learning tool for mastering flexbox concepts.
Tool
Conference Schedule - ICS File
— Download and view the complete conference schedule for May 22, 2025, in iCalendar format. This page provides access to all 25 events from the San Francisco conference, including keynotes, technical sessions, workshops, and office hours, which can be imported directly into your calendar application. A live preview of the ICS file contents is displayed below the download button for reference.
Tool
Annotated Presentation Creator
— Create annotated presentation slides with alt text and markdown notes. Upload your slide images, add accessibility descriptions and annotations with markdown support, then generate HTML output using customizable templates. The tool automatically saves your work and includes optional OCR functionality to extract text from slides.
Tool
Render JSON from Gemini Image Generation
— Parse and visualize JSON responses from the Google Gemini image generation API, extracting and displaying generated images, text content, and usage metadata in a formatted layout. The tool supports direct JSON input through paste or by loading example datasets, making it useful for testing and inspecting Gemini API outputs including model version information and token usage statistics.
Tool
HTML Live Preview
— Write HTML code directly in the editor pane and see the rendered output update in real-time in the preview pane. The editor supports live preview with debounced updates to prevent excessive rendering, and includes a copy button to save your HTML code to the clipboard. On mobile devices, toggle between the editor and preview views using the dedicated button in the toolbar.
Tool
Bluesky Thread Viewer
— View Bluesky thread conversations with multiple display options including nested thread view, chronological sorting, and media support. This viewer fetches complete discussion threads from Bluesky posts and renders them with color-coded depth indicators, clickable reply relationships, and embedded images and videos. Users can switch between different viewing modes, copy thread text or raw JSON data, and optionally hide non-author replies to focus on the original poster's main conversation.
Tool
RTF to HTML Converter
— Convert Rich Text Format (RTF) documents to HTML with preserved formatting, colors, and styling. Paste RTF content from your clipboard to automatically extract the color table and convert text formatting including bold styling, text colors, and background colors into inline HTML styles. The converter displays the raw RTF data, generated HTML code, and a live preview of the formatted output all in one interface.
Tool
Mask Visualizer
— Visualize bounding boxes and PNG masks from JSON data with support for multiple coordinate system origins. This tool accepts JSON input containing box coordinates and base64-encoded mask images, then displays them overlaid on an interactive canvas with real-time coordinate transformation. The visualization includes detailed information about each item's original and transformed coordinates based on the selected origin point.
Tool
Gemini API Image Mask Visualization
— Use the Gemini API to analyze images and generate segmentation masks with visual overlays. Upload an image and provide a prompt describing what you want to segment, then the application displays bounding boxes and mask visualizations directly on the image canvas. Token usage metrics are provided for each API call, and you can choose from various Gemini model versions including thinking and non-thinking variants.
Tool
Base64 Gzip Decoder
— Decode base64-encoded gzip data to retrieve the original decompressed content. Paste your base64 string into the input field and click the Decode button to process the data. The decoder handles the conversion from base64 format and gzip decompression in sequence, displaying the result or providing detailed error messages if the input is invalid.
Tool
Hacker News thread export
— Export Hacker News discussion threads in a formatted, hierarchical structure by providing a post ID or direct link to the thread. The tool fetches all comments from the specified post and organizes them with numbered paths that show the conversation structure, making it easy to read and copy the entire discussion for archival or sharing purposes.
Tool
Rich Paste to HTML Subset
— Convert rich text content from clipboard into clean, filtered HTML containing only semantic elements like paragraphs, headings, lists, links, and text formatting. Paste formatted content into the editable area to automatically extract and sanitize the HTML, removing unsupported tags and attributes while preserving the document structure and links. The cleaned HTML is displayed in a code editor and rendered in a live preview, with options to copy the code or clear all content.
Tool
Passkey Demo | tools.simonwillison.net
— Experiment with passkey registration and authentication using the WebAuthn API in your browser. This demo allows you to create passkey credentials, authenticate with them, and inspect the underlying protocol responses and data. Stored credentials are maintained locally in your browser's storage, making this a fully client-side implementation for learning how modern passwordless authentication works.
Tool
Lightning Timer
— Track time with Lightning Timer, a full-screen countdown application that displays elapsed seconds in large, easy-to-read format. Click the timer display to start, pause, or reset the countdown, and access the settings icon to configure the total duration and optional warning threshold that triggers a visual color change. The timer supports URL-based configuration for quick setup and displays the remaining time in both the page and browser title bar.
Tool
Avatar Web Component
— Display and edit images with an interactive cropping interface for creating avatars or profile pictures. Users can select images by clicking, dragging and dropping files, or pasting from the clipboard, then crop them to a specified aspect ratio using resizable handles. The final cropped image is automatically exported as a JPEG data URL and can be synced to a designated form input field for seamless integration with web forms.
Tool
Hugging Face Model Storage Checker
— Check the storage size of Hugging Face machine learning models by entering a model URL or repository path. The tool queries the Hugging Face API to retrieve the total storage used by the specified model and displays the result in a human-readable format (MB or GB). Models can be looked up using either their full Hugging Face URL or their model identifier in the format `username/model-name`.
Tool
Incomplete JSON Pretty Printer
— Format truncated or incomplete JSON into readable structures with automatic live formatting as you type. This tool applies consistent indentation and proper spacing to malformed or partial JSON snippets, displays validation status, and allows copying the formatted output to the clipboard with a single click. Example data is available to test the functionality.
Tool
Side Panel Modal with Dialog Element
— Explore a product catalog with interactive item details displayed in a smooth side panel modal. Click any product card to view comprehensive information including category, price, and description, with the option to toggle between modal and non-modal dialog behavior. The interface includes a feedback form within the side panel, allowing users to submit comments about products with a seamless animated experience.
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