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Document formats overlap in confusing ways, and picking the wrong tool wastes more time than the conversion saves. Here are the choices people get wrong most often.
Open it and try to select a sentence. If the text highlights, PDF to Word will give you an editable document. If nothing highlights, it is a scan — a photograph of a page with no text inside — and you need OCR PDF instead. That ten-second check saves the most common wasted conversion on the site.
Most mail systems stop at around 20–25 MB, and attachment encoding adds roughly a third on top — so a file that looks safe can still bounce. Compress PDF and Compress PPTX both work on the images inside, which is nearly always where the weight is.
Sign PDF lets you type, draw or upload a signature and place it on the page. Afterwards, run the file through Flatten PDF — otherwise the signature can remain a movable layer that a recipient is able to drag off in some PDF editors.
An .xlsx carries your formulas, hidden columns and other sheets inside it, and hiding a column protects nothing. Excel to JPG sends only the pixels of what was visible, so the workings genuinely do not travel. For a readable but fixed document, Excel to PDF is the better choice.
Rotating in your PDF viewer only changes what you see — nothing is saved into the file. Rotate PDF writes the orientation into the document itself. Do this before running OCR, because recognition accuracy drops noticeably on rotated pages.
Pasting straight from Word carries hundreds of Microsoft-specific style rules that override your theme. Word to HTML emits clean markup instead. Apply Word's built-in heading styles first — text that is merely big and bold becomes a bold paragraph, not a real heading.
Your files
Every tool here asks you to hand over a file, so it is fair to say plainly what happens next.
One honest caveat. Files are processed on a server, not entirely inside your browser. That is what lets the tools run on any device without installing anything, but it does mean your file leaves your computer. For documents under strict confidentiality obligations, desktop software that never uploads anything is the safer choice, and we would rather say so than pretend otherwise.
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The business model
ButDoc is supported by advertising. That is the whole model: no subscriptions, no premium tier, no file-size limits that disappear if you pay, and no watermark you have to buy your way out of at the download step.
We would rather be direct about this up front than let you discover it after uploading a document. Advertising pays for the servers, which is what keeps the tools free for the student converting a thesis and the freelancer merging invoices alike. More about who is behind the site is on our About page.
Questions
No. There is no sign-up, no email required and nothing to install. Open a tool, upload your file, download the result. Because there is no account, there is also no stored file history — keep your own copies.
Free, with no watermark and no paywall before download. The site is funded by advertising rather than subscriptions.
No. Uploads and their results are permanently removed within 60 minutes and there is no backup on our side. Once that window passes the file is genuinely gone, so always keep your original.
Yes. Everything runs in the browser, on iPhone and Android as well as Windows, Mac and Linux. Some tasks — adjusting spreadsheet column widths before converting, for instance — are simply easier on a desktop.
Document formats disagree with each other in ways no converter fully resolves. A PDF stores character positions rather than paragraphs; a plain text file holds no formatting at all; a slide places content on a canvas while a document flows it down a page. Each tool page explains what carries across for that specific conversion and what does not.
Yes — that is how the tools improve. Write to contact us and describe which tool you used, the file's format and rough size, and what you expected versus what you got. Please do not attach the document itself; a clear description is more useful and email is not a secure way to send anything confidential.