Free tools
Free tools for readers and writers
Small, fast utilities for people who learn by reading. Send anything to your Kindle, export your highlights and your vocabulary — no sign-up, and the ones that read your files do it inside your browser.
Free in the plain sense: no account, no trial, no credit card, nothing stamped on what comes out. The ones that touch your files — your clippings, your vocabulary database, your notes — run entirely in the browser, so nothing is uploaded and there is nothing for us to keep.
Tools for your Kindle
Get things onto the device, and get what you read back off it: anything you can paste becomes a chaptered EPUB, and your highlights and looked-up words become files you own.
Send anything to your Kindle, turned into a book
Paste text or Markdown — a ChatGPT answer, a report, your notes — and get a chaptered EPUB. Download it, or send it straight to your Kindle.
Your PDFs on your Kindle, as books rather than photographs of pages
Upload a PDF and get an EPUB with reflowable text and real chapters, so the type resizes and the page turns. Download it, or send it straight to your Kindle.
Kindle to PDF: the honest answer, and what to do instead
Wanting a Kindle book as a PDF turns out to mean five quite different things. One of them is genuinely impossible. The other four take about a minute — find yours below.
Export your Kindle highlights, organized by book
Upload My Clippings.txt and get your highlights and notes organized by book — Markdown for Obsidian, CSV for Excel, or a Notion import. Nothing is uploaded.
Turn your Kindle vocabulary into Anki flashcards
Turn your Kindle's vocab.db into Anki flashcards that keep each word's original sentence, or into a clean CSV. It all runs in your browser.
Turn your ChatGPT conversations into a book for your Kindle
Paste a ChatGPT, Claude or Gemini conversation and get an EPUB with one chapter per question. Download it, or send it straight to your Kindle.
Your Deep Research reports, on your Kindle instead of a browser tab
Turn a Deep Research report (ChatGPT, Gemini, Claude) into an EPUB with chapters and a table of contents. Paste the Markdown or upload the .docx.
Take your Notion pages to your Kindle, turned into a book
Upload your Notion export ZIP and get an EPUB with one page per chapter. Download it, or send it straight to your Kindle. The ZIP stays in your browser.
From your Obsidian vault to your Kindle, no plugins
Pick several .md notes and get an EPUB with one note per chapter, ready for your Kindle. No plugin to install; your notes stay in your browser.
Tools for writing
The two small ones we kept reaching for while building Sapiens: how long a text takes to read, and what a title looks like as a URL.
Word counter, with characters, sentences and reading time
Count words, characters and sentences as you type, and see how long the text takes to read. Everything runs locally — your text never leaves the browser.
Slug generator, for URLs that read like their title
Turn any title into a clean, URL-safe slug — lowercase, hyphens, accents folded away. Copy it with one click.
Like the tools? Wait until it writes you a course.
These are free because they're the easy part. The product turns a topic into a course you'd actually read — and sends it to the same Kindle.