Just Tool It
Just Tool It / Document Converter
On-device — nothing uploaded

Document Converter

Convert between PDF, DOCX, Excel, HTML, Markdown and plain text. Files stay in this tab — nothing is uploaded.

Drop a document here

or browse from your device — PDF, DOCX, XLSX, XLS, ODS, CSV, TXT, HTML, MD, RTF

All supported conversions

The matrix below shows every conversion this tool can do in your browser, without uploading anything. Conversions are grouped by source family: rich documents, spreadsheets, plain text and PDF.

Why convert documents in your browser?

Most "free online document converters" work by uploading your file to a server, running a conversion there, and emailing you a link. That works — but it leaves a copy of your document on infrastructure you don't control. If that server is breached, misconfigured, or simply careless about cleanup, your contract, payslip, scanned ID or internal report could leak.

This tool sidesteps the problem entirely. Every conversion runs inside this tab, using well-known open-source JavaScript libraries — SheetJS for spreadsheets, mammoth.js for DOCX, pdf.js for PDF text, jsPDF for generating PDFs, and a few smaller helpers. When you close the tab, the file is gone.

How it works (step-by-step)

  1. Drop your file. Click the upload area or drag a document onto it. The "From" format is auto-detected from the file extension — you can override it.
  2. Choose the target format. Pick what you want to convert to. The button stays disabled if the chosen pair isn't supported in the browser, and a hint explains why.
  3. Click Convert & download. The first time you use a particular conversion, the necessary library loads from a CDN (about 100–600 KB depending on the format). Your file is then read, converted in memory, and saved to your downloads folder.

What can’t run in the browser?

Some document conversions genuinely need a server. We don’t list them here because we refuse to silently upload your file. In particular:

  • DOC (legacy binary Word, pre-2007) — needs a server-side converter such as LibreOffice.
  • PPT / PPTX (PowerPoint) as input — no usable browser library can parse slide layouts.
  • ODT / ODP (OpenDocument text / presentations) — likewise no usable browser library.
  • PDF → DOCX / XLSX with layout fidelity — possible only with heavy server-side tools. We do offer PDF → text, HTML and Markdown.

If you need any of these, you’ll need a converter that uploads your file. We’d rather be upfront about it than pretend.

Frequently asked questions

Is my file uploaded to a server?
No. The page itself is downloaded normally, and a small JavaScript library is fetched from a public CDN when you first convert a particular format — but your file is read with the browser File API and processed entirely in this tab. You can confirm by opening DevTools, switching to the Network panel, and clicking Convert & download: no request will carry your file body to any server.
Why is some conversion missing or greyed out?
We only show conversions that work reliably in the browser. Hard cases like legacy .doc, PowerPoint, and PDF-to-Word-with-fidelity require server-side tools we deliberately don’t use. If a "To" format isn’t in the dropdown for your input, it means there’s no good in-browser path for that pair.
How accurate is PDF → text?
Good for PDFs that contain real text (most PDFs exported from Word, web pages, or LaTeX). Poor for scanned PDFs that are really just images — those need OCR, which we don’t do in this tool. If the resulting text file is empty or gibberish, your PDF is almost certainly a scan.
Will tables, formatting and images survive the conversion?
Spreadsheet ↔ spreadsheet conversions (XLSX/XLS/ODS/CSV) preserve cells, rows and sheet names. DOCX → HTML/MD preserves headings, lists, bold/italic, tables and inline images. HTML/MD → PDF and → DOCX preserve text formatting; complex CSS layouts may flatten. PDF → text only extracts text — layout is intentionally discarded.
Is there a file-size limit?
There’s no fixed limit, only your device’s RAM. Most laptops handle documents and spreadsheets up to ~50 MB comfortably. Very large PDFs (hundreds of MB) may be slow or hit memory limits on low-end devices.