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https://github.com/simonw/tools

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# tools.simonwillison.net



Miscellaneous HTML+JavaScript tools I have built, almost all with the assistance of LLMs.



This collection is partly **an experiment** in how much it's possible to get done through prompting alone, against projects with extremely low stakes. The prompts I used are linked to from [the commit messages](https://github.com/simonw/tools/commits) for each tool. Most of them used a version of the custom instructions [described here](https://simonwillison.net/2024/Dec/19/one-shot-python-tools/#custom-instructions).



[Everything I built with Claude Artifacts this week](https://simonwillison.net/2024/Oct/21/claude-artifacts/) describes how I built a lot of these.



## Tools



- [OCR](https://tools.simonwillison.net/ocr) for PDF files and images that runs entirely in your browser

- [Render Markdown](https://tools.simonwillison.net/render-markdown) renders Markdown to HTML using the GitHub Markdown API

- [Annotated presentation creator](https://til.simonwillison.net/tools/annotated-presentations) to help turn slides into an annotated presentation

- [Box shadow CSS generator](https://tools.simonwillison.net/box-shadow) generates the CSS for a box shadow with interactive settings

- [Compare PDFs](https://tools.simonwillison.net/compare-pdfs) provides a visual comparison of the pages of two PDF files

- [Image resize and quality comparison](https://tools.simonwillison.net/image-resize-quality) converts an image to JPEGs using a number of different quality settings so you can select the smallest file size that is still usefully legible ([how I built this](https://simonwillison.net/2024/Jul/26/image-resize-and-quality-comparison/))

- [YouTube Thumbnails](https://tools.simonwillison.net/youtube-thumbnails) - paste in the URL to a YouTube video, get back all of the URLs to thumbnail images of different sizes for that video

- [SVG to JPEG/PNG](https://tools.simonwillison.net/svg-render) - turn an SVG file into a rendered JPEG or PNG ([how I built this](https://simonwillison.net/2024/Oct/6/svg-to-jpg-png/))

- [Jina Reader](https://tools.simonwillison.net/jina-reader) - convert any URL to copyable Markdown using the [Jina Reader API](https://jina.ai/reader/)

- [Extract URLs](https://tools.simonwillison.net/extract-urls) - copy a section from a web page to your clipboard, paste it in here and get back a plain text list of all of the linked URLs from that section

- [EXIF Data Viewer](https://tools.simonwillison.net/exif) - view EXIF data for an image

- [MDN Browser Support Timelines](https://tools.simonwillison.net/mdn-timelines) - search for web features and view the browser support timeline pulled from [MDN](https://developer.mozilla.org/)

- [Timestamp Converter](https://tools.simonwillison.net/unix-timestamp) - convert between Unix timestamps and human-readable dates

- [Timezones](https://tools.simonwillison.net/timezones) - select two timezones to see a table comparing their times for the next 48 hours

- [Social media cropper](https://tools.simonwillison.net/social-media-cropper) - open or paste in an image, crop it to 2x1 and download a compressed JPEG for use as a social media card

- [Writing Style Analyzer](https://tools.simonwillison.net/writing-style) - identify weasel words, passive voice, duplicate words - adapted from [these shell scripts](https://matt.might.net/articles/shell-scripts-for-passive-voice-weasel-words-duplicates/) published by Matt Might

- [Navigation for headings](https://tools.simonwillison.net/nav-for-headings) - paste in an HTML document with headings, each heading is assigned a unique ID and the tool then generates a navigation `
    `

    - [JSON to YAML](https://tools.simonwillison.net/json-to-yaml) - convert JSON to YAML, showing different styles of YAML output

    - [YAML Explorer](https://tools.simonwillison.net/yaml-explorer) - nested hierarchy explorer for YAML files, which can be loaded from an external URL and have their expand/collapse state persisted in the URL to the tool

    - [Word Counter](https://tools.simonwillison.net/word-counter) - count words across multiple blocks of text, persisted to localStorage

    - [PHP Deserializer](https://tools.simonwillison.net/php-deserializer) - paste in serealized PHP data, get back JSON
    


    ## LLM playgrounds and debuggers
    


    - [Haiku](https://tools.simonwillison.net/haiku) generates Haikus from your camera using Claude 3 Haiku

    - [Chrome Prompt Playground](https://tools.simonwillison.net/chrome-prompt-playground) is a UI for running prompts through the Google Chrome Canary experimental Gemini Nano LLM and saving the results in local storage

    - [Gemini API Image Bounding Box Visualizer](https://tools.simonwillison.net/gemini-bbox) - run prompts against Google Gemini models that return bounding box co-ordinates and visualize them against the original image, see [this post](https://simonwillison.net/2024/Aug/26/gemini-bounding-box-visualization/) for details

    - [Claude Token Counter](https://tools.simonwillison.net/claude-token-counter) - counts the number of tokens in a Claude prompt

    - [OpenAI audio input](https://tools.simonwillison.net/openai-audio) - record audio through the microphone and send it to OpenAI's audio model

    - [OpenAI audio output](https://tools.simonwillison.net/openai-audio-output) - run prompts against OpenAI that produce audio output and listen to it or download it from the browser
    


    ## Miscellaneous
    


    - [Arena animated](https://tools.simonwillison.net/arena-animated) animates the progression of the LMSYS Chatbot Arena, inspired by [this visualization](https://public.flourish.studio/visualisation/17992181/) by [Peter Gostev](https://www.linkedin.com/posts/peter-gostev_how-companies-llms-compare-over-the-course-activity-7196899934615257090-zilk) (via [Time-Winter-4319 on Reddit](https://www.reddit.com/r/LocalLLaMA/comments/1bp4j19/gpt4_is_no_longer_the_top_dog_timelapse_of/))

    - [California Clock Change](https://tools.simonwillison.net/california-clock-change) - shows when the clocks will next change for daylight saving time in California

    - [Bluesky WebSocket Firehose](https://tools.simonwillison.net/bluesky-firehose) showing a live firehose of Bluesky activity, [described here](https://simonwillison.net/2024/Nov/20/bluesky-websocket-firehose/)

    - [Bluesky resolve DID](https://tools.simonwillison.net/bluesky-resolve) turns a Bluesky ID such as `simonwillison.net` into a DID

    - [Prompts.js](https://tools.simonwillison.net/prompts-js) small JavaScript library enabling `await Prompts.alert("hi")` and `await Prompts.confirm("Continue?")` and `await Prompts.prompt("Enter your name")` 

    - [aria-live-regions](https://tools.simonwillison.net/aria-live-regions) demonstrates ARIA live regions
    


    ## On Observable
    


    On [Observable](https://observablehq.com/):
    


    - [Blog to newsletter](https://observablehq.com/@simonw/blog-to-newsletter) helps me turn my blog into a [newsletter](https://simonw.substack.com)

    - [Weeknotes](https://observablehq.com/@simonw/weeknotes) helps me write my [weeknotes](https://simonwillison.net/tags/weeknotes/)

    - [Convert Claude JSON to Markdown](https://observablehq.com/@simonw/convert-claude-json-to-markdown) for sharing Claude conversation transcripts

    - [Hacker News homepage with links to comments ordered by most recent first](https://observablehq.com/@simonw/hacker-news-homepage)