Small free tools

Single-purpose utilities that do one thing without an account, a subscription, or a server round trip. Every one is MIT licensed with the source in the open.

Run in this browser, nothing to install

• Paste a table, get CSV / TSV / Markdown

  Copy a table off any page and paste it here. Merged cells are expanded so every row has the same column count. Nothing is uploaded.

Writing

• Why "unique solution" is not enough for a nonogram puzzle

  A worked five-by-five that has exactly one solution and still needs a guess, and the stronger line-solvable check that catches it.

Reference data

• Longevity Intervention Evidence Ledger

  Every longevity intervention that has entered a registered human trial, one row each: trial registry number, sample size, evidence level, and result direction. Updated quarterly. Not medical advice.

• The longevity research evidence index

  Every checkable claim in the book In My Lifetime?, listed with the level of evidence behind it, from cells in a dish up to a randomised trial, and a link to the source it came from. 113 claims, version 1.0, data cutoff 2026-07-27. Not medical advice.

Chrome extensions

• Table to Excel / CSV / Markdown

  Export any HTML table to XLSX, CSV or Markdown. No row cap, merged cells expanded. source · privacy

• PDF Dark Mode

  Dark mode for any PDF in Chrome, including PDFs served from the web — not only file:// ones. No server, no telemetry. source · privacy

• Smart PDF Rename

  Rename PDFs from what is inside them: title, author, year, arXiv ID, DOI, invoice number. Batch, fully local. source · privacy

• Timezone Convert

  Highlight “3pm EST” on any page, right-click, read your local time in place. DST and CST/IST ambiguity handled. Works offline. source · privacy

• Jump to Recipe

  Instant recipe card from a food blog. Reads the page’s own schema.org data instead of guessing, so it does not break the page. source · privacy

• YouTube Frame Capture

  Screenshot YouTube at full playback resolution without the black-frame problem. Alt+S, PNG or JPEG, Shorts supported. source · privacy