
tools
Assorted useful tools, almost entirely generated using LLMs
Stars: 892

This repository contains a collection of various tools and utilities that can be used for different purposes. It includes scripts, programs, and resources to assist with tasks related to software development, data analysis, automation, and more. The tools are designed to be versatile and easy to use, providing solutions for common challenges faced by developers and users alike.
README:
Miscellaneous HTML+JavaScript tools built mostly with the help of LLMs.
This collection is an experiment in prompt-driven development with very low stakes.
The colophon lists commit messages and transcripts for every tool.
The code lives in simonw/tools and many tools used the Claude custom instructions described here.
- Social media cropper crop images to 2×1 for social sharing
- Image resize and quality comparison compare JPEG quality settings
- Image to JPEG convert PNG or WebP files to JPEG
- Image to SVG trace bitmap images to SVG paths
- SVG to JPEG/PNG render an SVG to a raster image
- SVG sandbox display decoded SVG files safely
- SVG progressive render watch an SVG draw itself
- BBox cropper draw bounding boxes and read the coordinates
- Mask visualizer inspect JSON masks with bounding boxes
- FFmpeg crop helper generate FFmpeg commands for cropped videos
- TIFF orientation viewer inspect EXIF orientation metadata
- Avatar web component upload and crop avatars in place
- YouTube Thumbnails list thumbnail URLs for a video
- OCR recognize text from images and PDFs in your browser
- PDF OCR run optical character recognition on uploaded PDFs
- Compare PDFs visualize differences between two PDFs
- Render Markdown convert Markdown to HTML using the GitHub API
- HTML preview type HTML on the left and see it rendered on the right
- RTF to HTML inspect RTF clipboard data and convert it to HTML
- Markdown math live preview of Markdown with LaTeX equations
- Footnotes experiment demo linking footnotes to popups
- Reading time calculator estimate how long text will take to read
- Word counter count words across multiple text blocks
-
Text wrap balance nav explore the
text-wrap: balance
property - Navigation for headings generate an ID-based table of contents
- Paste rich text inspect HTML and plain text on your clipboard
- Paste HTML subset see which tags survive HTML sanitization
- Clipboard viewer debug everything stored in your clipboard
- Extract URLs pull a list of links from pasted HTML
- JSON to Markdown transcript convert transcript JSON to Markdown
- JSON to YAML convert between JSON and YAML formats
- YAML Explorer browse YAML documents in a collapsible tree
- JSON schema builder visually design a JSON schema
- Incomplete JSON printer pretty print partial JSON documents
- PHP Deserializer turn serialized PHP into JSON
- SQL Pretty Printer reformat SQL queries for readability
-
Pipfile.lock parser extract dependency versions from
Pipfile.lock
- Timestamp Converter convert Unix timestamps to readable dates
- Timezones compare times across multiple time zones
- Date calculator count days between dates or only weekdays
- Transfer time estimator work out how long file transfers will take
- Token usage calculator summarize LLM token logs by model
- LLM prices redirect quick link to the latest model pricing site
- CSV marker map plot markers on a map from a CSV file
- Species observation map browse recent iNaturalist sightings
- GitHub API write upload text or images directly to a repo
- GitHub issue viewer fetch GitHub issues and comments
- GitHub issue to Markdown turn an issue thread into Markdown
- Zip/Wheel explorer view the contents of Python wheels and zips
- Ares phonetic alphabet convert text to the ARES emergency phonetic code
- Code with Claude 2025 prototype workflow for Claude coding
-
Side panel dialog demo experiment with the HTML
dialog
element - Broadcast channel chat chat across tabs using BroadcastChannel
- Bluesky WebSocket Firehose watch real-time activity on Bluesky
-
Bluesky resolve DID convert a handle like
simonwillison.net
into a DID - Bluesky timeline view a user’s recent posts and replies
- Bluesky thread export save a Bluesky thread to Markdown
- Event planner rough schedule planner stored in localStorage
- Passkeys demo experiment with browser-based passkey authentication
- Haiku generate haikus using Claude Haiku and your webcam
- Chrome Prompt Playground run prompts on Chrome’s Gemini Nano
- Gemini bounding box visualizer visualize bounding boxes returned by Gemini
- Gemini chat client simple chat UI for the Gemini API
- Gemini mask visualizer overlay segmentation masks from Gemini
- Gemini image JSON renderer display images from Gemini JSON output
- Claude Token Counter count tokens for Claude prompts
- OpenAI audio input record and send audio to OpenAI models
- OpenAI audio output generate speech with OpenAI voices
- OpenAI WebRTC demo interact with OpenAI’s real-time audio API
- GPT-4o Gist audio player play audio responses stored on GitHub Gist
- JSON schema builder build JSON schemas with a visual editor
- Arena animated animated chart of the LMSYS Chatbot Arena
- California Clock Change see when daylight saving time changes
- Open Sauce 2025 schedule browse the upcoming conference sessions
- OpenFreeMap demo MapLibre demo with random points in San Francisco
- Progress of the US presidency track days elapsed in the current term
- User Agent display show your browser’s user agent string
- Encrypt / decrypt message share short encrypted messages
- ARIA live regions demo of dynamic page announcements
- Prompts.js small library for nicer JavaScript prompts
- APSW SQLite query explainer explain SQLite queries using APSW
On Observable:
- Blog to newsletter helps turn blog posts into a newsletter
- Convert Claude JSON to Markdown for sharing Claude transcripts
- Hacker News homepage with links to comments ordered by most recent first
For Tasks:
Click tags to check more tools for each tasksFor Jobs:
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