Last week a friend messaged me: “Bro I need to send this Excel spreadsheet as a PDF but I don’t have Office on this laptop. Every site I try either messes up the columns or wants me to pay.” He’d been trying for 30 minutes. Uploaded to three different sites. One stripped the formatting. One put a watermark. One asked for a credit card.
I sent him one link. He had his PDF in under a minute. No signup, no watermark, no broken columns.
This is the thing about Microsoft Office file conversions — they seem simple until you actually try to do them. Word to PDF should be straightforward, right? But then your fonts change. Or your table shifts. Or your PowerPoint slides come out as a single page instead of one slide per page. The problem is that most free converters use open-source rendering engines like LibreOffice. They get close, but “close” isn’t good enough when your boss is waiting for that report.
All 6 Conversion Tools at a Glance
| Conversion | Input | Output | Best For | Link |
|---|---|---|---|---|
| Word to PDF | .doc, .docx | Resumes, contracts, reports, assignments | Convert | |
| PDF to Word | .docx | Editing received PDFs, updating old documents | Convert | |
| Excel to PDF | .xls, .xlsx | Invoices, financial reports, price lists | Convert | |
| PDF to Excel | .xlsx | Bank statements, data extraction, tables | Convert | |
| PPT to PDF | .ppt, .pptx | Sharing slides, handouts, archiving | Convert | |
| PDF to PPT | .pptx | Repurposing PDF content into presentations | Convert |
Why most online converters mess up your files
Here’s what happens behind the scenes. You upload a Word file. The server opens it with LibreOffice or a similar engine. LibreOffice interprets your document differently than Word does — different font metrics, different line spacing calculations, different table layout algorithms. The result looks “almost right” but page 4 becomes page 5, the header font changed from Calibri to something vaguely similar, and the chart shifted left by half a centimetre.
The same thing happens with Excel and PowerPoint. Excel spreadsheets with merged cells, conditional formatting, or multiple sheets? Good luck getting those to look right without the actual Excel engine. PowerPoint with custom fonts, animations stripped down to static slides, embedded videos that just disappear? That’s what open-source engines give you.
The only way to get a perfect conversion is to use actual Microsoft Office. Word converting Word files. Excel converting Excel files. PowerPoint converting PowerPoint files. That’s what ConvertKr does — it runs a Windows server with genuine Microsoft Office installed. Your file goes in, Office processes it, the result comes back. Identical to what you’d get on your own computer with Office installed.
What breaks with other converters (and what doesn’t with ConvertKr)
| Feature | LibreOffice-based tools | Google Drive | ConvertKr (MS Office) |
|---|---|---|---|
| Standard fonts (Calibri, Arial) | Mostly OK | Substituted | Perfect |
| Complex tables | Often shifts | Breaks frequently | Perfect |
| Headers & footers | Usually OK | Sometimes lost | Perfect |
| Page breaks & page count | Can add extra pages | Often wrong | Exact match |
| Charts & graphs | Colours may change | Re-rendered differently | Identical |
| Merged cells in Excel | Sometimes breaks | Frequently breaks | Preserved |
| Conditional formatting | Partially supported | Lost | Preserved |
| PPT slide transitions | Stripped (static) | Stripped (static) | Stripped (static)* |
| Hyperlinks | Sometimes stripped | Usually preserved | Preserved |
*Transitions and animations can’t exist in PDF — it’s a static format. But slide layout, fonts, and visual appearance are preserved perfectly.
Word to PDF
The most common conversion. Resumes, contracts, reports, university assignments — everyone needs this eventually.
ConvertKr Word to PDF handles .doc and .docx files. Upload your file, get back a PDF that looks exactly like it would if you opened it in Word and hit Save As PDF. Fonts preserved. Tables aligned. Headers and footers intact. Page breaks exactly where they should be.
I’ve tested this with a 40-page thesis that had complex tables, footnotes, a table of contents with dotted leaders, and mixed fonts. The PDF was pixel-perfect. Same page count. Same layout. Because it’s actual Word doing the conversion, not a knockoff.
When you’d use this: you’re on a Chromebook, a borrowed laptop, your phone, or any machine without Office installed. Or you’re at work and IT locked down the Save As PDF option (yes, some companies do this).
PDF to Word
The reverse is harder. PDF is a fixed-layout format — it stores characters at specific positions, not as flowing paragraphs. Converting back to Word requires the engine to figure out what’s a paragraph, what’s a heading, what’s a table, and reconstruct the document structure.
ConvertKr PDF to Word uses Microsoft Word’s own PDF import feature. Word is surprisingly good at this — it reads the PDF, analyses the layout, and creates an editable .docx that preserves most of the original structure. Tables come back as tables. Headings come back as headings. It’s not magic — complex layouts with columns and floating images will need manual cleanup — but it’s the best automated result you can get.
When you’d use this: you received a PDF and need to edit the content. A contract where you need to change a clause. A report where the numbers need updating. An old document where the original Word file is lost and all you have is the PDF. Instead of retyping the whole thing, convert it and edit.
Excel to PDF
This is where most free tools completely fall apart. Excel spreadsheets are complex. Multiple sheets, merged cells, conditional formatting, print areas, page breaks, frozen panes, charts — all of this needs to be translated into a flat PDF.
ConvertKr Excel to PDF lets Excel handle the export. It respects your print settings — if you set a specific print area, that’s what gets exported. If you set landscape orientation, that’s preserved. If you have multiple sheets, they all get included. Column widths stay as you set them. Charts render correctly with the right colours and fonts.
When you’d use this: sharing financial reports, invoices, price lists, inventory sheets — anywhere you need to send data that the recipient should see but not edit. PDF ensures the layout stays fixed regardless of what spreadsheet software (or screen size) the recipient uses.
PDF to Excel
You get a bank statement as a PDF. Or a government report full of tables. Or a supplier price list in PDF format. You need that data in a spreadsheet so you can sort it, filter it, add formulas, actually work with it.
ConvertKr PDF to Excel extracts the tabular data from the PDF and puts it into an Excel file. It uses Word as an intermediate step — Word reads the PDF structure, and then the data is exported to .xlsx format. For clean, well-structured PDF tables, the result is very usable. You’ll likely need to clean up some formatting, but the data is there and ready to work with.
When you’d use this: any time you’re staring at a PDF full of numbers you need to analyse. Bank statements, annual reports, product catalogues, academic data sets. Beats typing it all out manually.
PowerPoint to PDF
You built a presentation and need to share it with someone who doesn’t have PowerPoint. Or you want to distribute slides as a handout. Or you need to archive a presentation in a format that won’t change over time.
ConvertKr PowerPoint to PDF converts .ppt and .pptx files. Each slide becomes a page in the PDF. Fonts, colours, shapes, images, charts — all preserved exactly as they appear in PowerPoint. Animations and transitions obviously don’t survive (it’s a static PDF), but the visual layout is identical.
When you’d use this: sharing presentation content without requiring PowerPoint. Sending slides to a client as a PDF attachment. Creating printable handouts from a presentation. Archiving important presentations.
PDF to PowerPoint
ConvertKr PDF to PowerPoint takes a PDF and converts each page into a PowerPoint slide. Useful when someone sends you slides as a PDF and you need to edit them, or when you want to use content from a PDF in a presentation.
The result gives you editable slides. Text is selectable and editable. Images are preserved. It won’t be a perfect reconstruction of the original .pptx (PDF doesn’t store slide master information, animations, or transitions), but it gives you a solid starting point to build from rather than recreating every slide from scratch.
When you’d use this: you received presentation content as a PDF and need to build on it. Or you want to repurpose pages from a PDF report into a slide deck.
ConvertKr vs Other Converters — Full Comparison
| Feature | ConvertKr | Adobe Acrobat | iLovePDF / Smallpdf | Google Drive | LibreOffice |
|---|---|---|---|---|---|
| Conversion engine | MS Office | Adobe | LibreOffice | LibreOffice | |
| Price | Free | ~$13/month | Free (limited) / $9/month | Free | Free |
| Signup required | No | Yes | Yes (for full access) | Yes (Google account) | No (desktop install) |
| Formatting accuracy | Identical to Office | Excellent | Good for simple files | Fair | Good |
| Word to PDF | Yes | Yes | Yes | Yes | Yes |
| PDF to Word | Yes | Yes | Yes | Yes | Limited |
| Excel to PDF | Yes | No | Yes | Yes | Yes |
| PDF to Excel | Yes | Yes | Yes (paid) | No | No |
| PPT to PDF | Yes | No | Yes | Yes | Yes |
| PDF to PPT | Yes | Yes (paid) | Yes (paid) | No | No |
| Daily usage limit | Unlimited | Unlimited (paid) | 1-2 files free | Unlimited | Unlimited |
| Watermarks on free tier | Never | N/A (paid) | Some tools add them | No | No |
| Works on mobile | Yes | Yes (app) | Yes | Yes (app) | No |
Privacy
One concern with any online converter: what happens to your files? With ConvertKr, your file is uploaded, converted on a dedicated Windows server, and the result is sent back. Files are automatically deleted within 60 seconds of conversion. No files are stored permanently. No account is needed, so there’s no profile tracking your conversion history.
If your files are extremely sensitive (legal documents, medical records, financial data with personal information), the safest option is always to convert locally using installed software. For everything else, a quick online conversion is practical and convenient.
When to use which tool
| You need to… | Use this | Why |
|---|---|---|
| Send a document that must look perfect | Word to PDF | Recipient sees exactly what you see |
| Edit text in a received PDF | PDF to Word | Make changes, convert back to PDF |
| Share a spreadsheet as a fixed layout | Excel to PDF | No one can accidentally edit the numbers |
| Extract data from a PDF table | PDF to Excel | Sort, filter, and add formulas to the data |
| Share slides without needing PowerPoint | PPT to PDF | Everyone can open a PDF |
| Edit slides you received as a PDF | PDF to PPT | Get editable slides instead of fixed pages |
FAQ
Are the conversions really free?
Yes. No premium tier, no usage limits, no watermarks. ConvertKr makes money through ads, not subscriptions.
What’s the file size limit?
50MB per file. That covers the vast majority of documents. If your file is larger, try compressing it first (if it’s a PDF) or reducing image sizes in the source document.
Do I need to create an account?
No. No signup, no email, no login. Upload, convert, download.
Can I convert multiple files at once?
Currently one file at a time. Batch conversion is on the roadmap.
Will my fonts be preserved?
Yes, because the conversion uses actual Microsoft Office which has access to standard Windows fonts. If your document uses a very uncommon custom font that isn’t installed on the server, it may substitute — but for standard business documents (Calibri, Arial, Times New Roman, etc.), it’s perfect.
Does it work on mobile?
Yes. The website works in any mobile browser. Upload from your phone’s files, get the converted file back. No app needed.
What about password-protected files?
You’ll need to remove the password before converting. For PDFs, you can use ConvertKr’s PDF unlocker. For password-protected Word/Excel/PPT files, you need to open them and remove the password in Office first.
Need to convert a file? Pick your tool: Word to PDF | PDF to Word | Excel to PDF | PDF to Excel | PPT to PDF | PDF to PPT