Two Trees

Toolkit · 3 tools

Conversion tools

Convert CSV to XLSX, export one XLSX sheet to CSV, turn a single HEIC photo into JPEG, or render Markdown as PDF. Every file is processed locally in your browser.

CSV ↔ Excel

Convert CSV and XLSX spreadsheets locally.

Open tool

HEIC to JPG

Convert a HEIC photo to a JPEG image.

Open tool

Markdown to PDF

Turn supported Markdown text into a PDF document.

Open tool

Choose the conversion that matches the source

The conversion tools change a file’s container or representation without sending it to a processing service. Convert CSV text to an XLSX workbook, export one worksheet to CSV, turn a single HEIC still into JPEG, or render a small Markdown document as PDF.

Pick by task

  • Use CSV ↔ Excel when the data is a single table. CSV to XLSX writes cells as text so leading zeroes and formula-looking values stay intact.
  • Use XLSX to CSV when you need one selected worksheet as portable text. Other sheets are not silently combined.
  • Use HEIC to JPG for a single still photo that other applications cannot open. HEIC sequences, HDR variants and depth data are outside scope.
  • Use Markdown to PDF for headings, paragraphs, lists and code blocks. The PDF core does not fetch external images or render raw HTML.

Formats, metadata and unsupported content

  • Each tool states its file, row, cell and page limits. Large workbooks and long documents should be checked on the device you will use.
  • Imported spreadsheet formulas are never executed. XLSX to CSV uses the selected sheet’s formatted values.
  • HEIC conversion may drop metadata or HDR information, and a still export cannot preserve a multi-image sequence.
  • Markdown conversion rejects unsupported characters or constructs rather than silently replacing them. Inspect the PDF before sharing it.

Common questions

Are converted files uploaded?

No. Parsing, rendering and file creation happen in the browser tab. The source file and the generated output stay on your device.

Does XLSX to CSV preserve formulas?

No. It exports the selected sheet’s cached values as CSV, not live formulas. This is deliberate: a CSV is a plain table and cannot carry spreadsheet formulas safely.

Why did a Markdown character or image disappear?

The PDF renderer supports a documented subset and a bundled font. Unsupported glyphs, external images and raw HTML are rejected or omitted rather than approximated silently.

Processing happens in your browser. Files and pasted contents are not uploaded. No account needed.