Why Converting Word to PDF Still Breaks Documents
Converting Word to PDF sounds like it should be lossless. It rarely is. DOCX and PDF are both page-oriented formats, but they describe a page in completely different terms, and the gap between them is where formatting goes missing.
A DOCX file is a ZIP archive of XML that describes intent: this paragraph uses this style, this run is bold, this table has these rows. A PDF describes result: draw this glyph at this coordinate. Getting from one to the other means re-running pagination from scratch. Nothing is copied — everything is recomputed.
The Font Substitution Problem
The single biggest cause of a PDF that "looks wrong" is fonts. If the converter does not have your document's typeface, it picks something else. A different typeface has different character widths, so words wrap in different places, paragraphs grow or shrink, and your three-page document quietly becomes four.
Why Calibri and Cambria Disappear
Word's default fonts are Calibri for body text and Cambria for headings. Both are licensed, and neither can be redistributed with a web tool. Every free converter has to substitute them, and most substitute badly — swapping in a generic sans-serif and letting the layout drift.
There is a correct answer, and it is the one LibreOffice has used for years: substitute a metric-compatible face. Different letterforms, identical advance widths. We cover exactly how that works further down.
What Happens to Your File on a Server
The second problem has nothing to do with layout. Nearly every free converter uploads your document to a machine you do not control, converts it there, and keeps a copy for a while.
Published retention windows: PDF24 one hour, iLovePDF two hours, PDF Candy two hours, Soda PDF twenty-four hours. None of those companies is behaving badly — that is simply how server-side conversion works. But if the document is a signed contract, an unreleased financial report, or a résumé with your home address in it, "deleted within two hours" is a different proposition from "never left my laptop".
You can also strip metadata from your files before sharing them, for the same reason.
What Is a Word to PDF Converter?
A Word to PDF converter reads a .docx file and produces a PDF that reproduces its content as a fixed, portable page. A client-side converter does this inside your browser, so the document is never transmitted to a server.
That second sentence is what separates one Word to PDF converter from another, and it is the part worth paying attention to.
DOCX vs DOC: What's the Difference?
DOCX has been Word's format since 2007. It is a ZIP archive of XML files, which is why a browser can open it at all. DOC is the older binary format — an OLE compound file with no public XML inside.
This tool handles DOCX. If you drop a .doc file, it will tell you so and ask you to open it in Word and use Save As → .docx first. That is a two-click fix, and it produces a far better conversion than any tool guessing at a binary format.
Client-Side vs Server-Side Conversion
Server-side conversion usually runs LibreOffice or a commercial engine on a machine in a data centre. It is very accurate. It also requires your file to make a round trip.
Client-side conversion runs the same job in JavaScript, on your own hardware. It is less accurate on complex layouts, and completely private.
Why Browser-Based Means Private by Default
Privacy here is not a policy — it is an architectural fact. There is no upload endpoint. Open your browser's network tab while you convert and you will see the font files being fetched and nothing else going out. A policy can change; a missing upload cannot.
How to Convert Word to PDF in 3 Steps
Drop your DOCX file
Drag a .docx onto the box above, or click to browse. You can add up to 20 documents at once on desktop, 5 on mobile. Files are read directly from disk into your browser — there is no upload step, so large documents start instantly instead of waiting on your connection.
Read the fidelity report
As soon as a file lands, we open the archive and inspect the raw document XML. Within a second you get a list of what will be preserved exactly, what will be substituted, and what will be simplified — headers, footers, columns, text boxes, footnotes, tracked changes. This appears before you convert, not after you download, so you can still choose your browser's Print to PDF instead if the document needs perfect fidelity.
Convert and download
Pick A4 or Letter, then convert. One document downloads as a PDF; several download as a ZIP. The output contains a real text layer, so you can select, search and copy from it — and so can the applicant tracking systems that read résumés.
What This Word to PDF Converter Preserves — and What It Doesn't
This is the section no other free Word to PDF converter publishes. We think that is strange, because it is the first thing anyone actually wants to know.
Fully Preserved
Paragraphs and heading levels. Bold, italic and underline. Text colour. Left, centre, right and justified alignment. Bulleted and numbered lists, including nested ones. Embedded images. Basic tables, with header rows repeated when a table spans a page break.
Hyperlinks are preserved as real, clickable PDF link annotations — not merely underlined blue text that looks like a link and does nothing.
Preserved with Metric-Compatible Substitution
A metric-compatible font has different glyph designs but identical character advance widths. Because the widths match, every line breaks in the same place and every page breaks in the same place. The document is visually very close and structurally identical.
Calibri → Carlito, Cambria → Caladea
We ship Carlito and Caladea, the open-licensed metric-compatible counterparts to Calibri and Cambria, and this is the same pairing LibreOffice uses. Arial, Times New Roman and Courier New map to Helvetica, Times and Courier, which are metric-compatible by design and built into every PDF reader.
We verify this rather than assume it: our build step compares the advance width of every character between the original font and our subset, and refuses to ship on any mismatch. Current result across all eight faces is zero width differences across 198 characters. The subsets total 551KB, down from 2,996KB, and a typical document downloads about 182KB of font data once.
Fonts with no metric-compatible equivalent — Georgia, Verdana, Segoe UI, corporate typefaces — are reported as reflowing, because they will.
Simplified or Not Supported
Headers and footers. Multi-column layouts. Floating text boxes. SmartArt and charts. Footnotes and endnotes. Tracked changes and comments. Field codes such as automatic page numbers and tables of contents. Text wrapping around images.
The embedded fonts also cover Latin scripts only, including the extended ranges Turkish and Vietnamese need. Cyrillic, Greek, CJK and Devanagari text is detected and reported rather than rendered as empty boxes.
When to Use the Print-to-PDF Fallback Instead
If your document depends on any of the above, open it in Word or Google Docs and use Print → Save as PDF. That routes through a full layout engine and will beat any browser-based converter, including this one. We would rather tell you that than hand you a broken file.
The Fidelity Contract at a Glance
| Feature | Status | Notes |
|---|---|---|
| Paragraphs and headings | Preserved | Heading levels 1–6 map directly |
| Bold, italic, underline | Preserved | Including nested combinations |
| Bulleted and numbered lists | Preserved | Nesting and numbering retained |
| Hyperlinks | Preserved | Real clickable PDF link annotations |
| Embedded images | Preserved | Scaled to the content width |
| Tables | Preserved | Header row repeats across page breaks |
| Calibri / Cambria | Substituted | Carlito / Caladea — identical widths |
| Arial / Times New Roman | Substituted | Helvetica / Times — identical widths |
| Georgia, Verdana, Segoe UI | Reflows | No metric-compatible equivalent exists |
| Headers and footers | Dropped | Use Print to PDF if you need them |
| Multi-column layouts | Dropped | Content flows as a single column |
| Text boxes, SmartArt, charts | Dropped | Not represented in the output |
| Footnotes and endnotes | Dropped | References are not carried over |
| Tracked changes and comments | Dropped | Accept or reject them in Word first |
| Non-Latin scripts | Reported | Detected and flagged, not silently broken |
What You Can Do With It
Job Applications and Résumés
Almost every job posting asks for a PDF, which makes Word to PDF conversion the last step before you apply, and almost every large employer runs your file through an applicant tracking system that reads the text layer. A converter that rasterises your page produces a PDF that looks fine to you and is completely invisible to the parser. This one writes real text, so your experience section is actually machine-readable.
Signed Contracts and Legal Documents
Contracts are the clearest case for keeping the file local. A draft agreement contains names, amounts and terms that have no business sitting in a third-party queue, however briefly. Converting in the browser removes the question entirely.
Academic Coursework and Theses
Submission portals want PDF, and they usually want it under a size cap. Text-based PDFs are small — a text-heavy thesis often converts to a fraction of the DOCX size. Do check the fidelity report first if your work uses footnotes, since those are one of the features that does not survive.
Confidential Internal Reports
Board packs, incident reviews, salary bands, unpublished results. If your company has a policy about uploading internal documents to external services, a client-side tool sidesteps it, because nothing is uploaded.
Why Privacy Matters for HR and Legal Files
HR and legal documents frequently contain personal data covered by GDPR and similar regimes. Sending them to a converter can constitute a transfer to a third-party processor, with all the paperwork that implies. Processing locally avoids creating the transfer in the first place.
TinyImagePro vs Online Word to PDF Converters
| TinyImagePro | Typical online converter | |
|---|---|---|
| Where conversion happens | Your browser | Their server |
| File uploaded | Never | Always |
| Retention after conversion | Nothing to retain | 1–24 hours |
| File size limit | Your device memory | 15MB–1GB |
| Files per batch | 20 on desktop | Often 1 at a time |
| Daily usage cap | None | 1–2 tasks on free tiers |
| Signup required | No | Often for batch or large files |
| Works offline after first load | Yes | No |
| Tells you what it changes | Yes, before converting | No |
| Complex layout accuracy | Good for text documents | Better — full layout engine |
When You Should Use a Server-Based Converter Instead
We would rather send you somewhere better than have you download something broken. Use a server-side Word to PDF converter, or Word itself, when:
- Your document has headers, footers or page numbers you need. These are structural in DOCX and are not reconstructed here.
- The layout is multi-column, such as a newsletter, brochure or two-column academic paper.
- It relies on text boxes, SmartArt or charts. These carry no equivalent in our output.
- Footnotes carry meaning, as in legal or academic writing.
- The document is not in a Latin script. Our embedded fonts cover Latin, including Turkish and Vietnamese, but not Cyrillic, Greek, CJK or Devanagari.
For those cases, opening the file in Word or Google Docs and using Print → Save as PDF is both free and more accurate than any browser tool. The fidelity report exists precisely so you can make this call before you waste a download.
After You Convert: Compress, Merge, and Share
Reducing PDF File Size for Email
A text-only PDF is usually small. If yours is large, the images inside it are almost always the reason. Shrinking them before conversion works far better than compressing the finished PDF, because the PDF stores whatever resolution you gave it. Run your pictures through our JPEG compressor or PNG compressor first, then convert.
Turning Images Into the Same PDF
Scanned pages, signed sheets and photographed whiteboards can go into a PDF of their own with our JPG to PDF tool, which also runs entirely in your browser.
If you are preparing a document for distribution, it is worth adding a watermark and clearing the metadata from any images it contains — photographs routinely carry GPS coordinates and camera serial numbers that survive being pasted into Word.
Everything above runs on the same principle as this Word to PDF converter: your files stay on your machine. The rest of the set lives on our free PDF tools page, and the image tools are on all our free browser tools.