CONVERT HTM → PDF (HTM to PDF)
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Ghostscript + QPDFHOW TO CONVERT HTM → PDF
Upload your HTM
Drop the document onto the uploader. We transfer over HTTPS and keep the file in an isolated processing container.
Render with LibreOffice
LibreOffice opens the HTM headlessly and writes it as PDF with styles, tables and images mapped across.
Download the PDF
The PDF is ready to download; typography, pagination and embedded assets match what you saw in the source.
Here is the short version — HTM is a legacy 8.3-filename variant of HTML, identical to .html in content. Hence the need for PDF. If you are staring at a HTM and need a clean PDF, retyping is never the answer — our converter routes the file through LibreOffice in headless mode and pandoc for text formats, which is the same pair of tools professional publishers rely on. Styles, tables, bullets and images all make it across. Context: HTM is a legacy 8.3-filename variant of HTML, identical to .html in content. PDF is Adobe's Portable Document Format, the fixed-layout standard for shareable documents.
Why convert HTM to PDF
HTM and PDF both describe paginated text, but they target different parts of the document life cycle. HTM is usually editable; PDF is usually final. Converting is about moving from editing to distribution (or the other way round) without losing headings, styles, tables or embedded images along the way.
HTM vs PDF — Technical specifications
Side-by-side comparison of the technical details.
HTM
- MIME type
- text/html
- Extension
- .htm
- Standard
- HTML Living Standard (WHATWG)
- Alias of
- .html
- Origin
- DOS 8.3 filename limit
- MIME Type
- text/html
- Category
- Documents & Text
- Full Name
- HTML Document (short)
- Conversion Engine
- PANDOC
- MIME type
- application/pdf
- Extension
- MIME Type
- application/pdf
- Category
- Documents & Text
- Full Name
- PDF Document
- Conversion Engine
- PANDOC
- Current version
- PDF 2.0 (ISO 32000-2:2020)
- Compression
- Flate, LZW, JBIG2, JPEG, JPEG 2000
- Max file size
- ~10 GB (practical); 2^31 bytes (theoretical per object)
- Color models
- RGB, CMYK, Grayscale, Lab, DeviceN, ICC-based
- Standard subsets
- PDF/A, PDF/X, PDF/UA, PDF/E, PDF/VT
| Specification | HTM | |
|---|---|---|
| MIME type | text/html | application/pdf |
| Extension | .htm | |
| Standard | HTML Living Standard (WHATWG) | — |
| Alias of | .html | — |
| Origin | DOS 8.3 filename limit | — |
| MIME Type | text/html | application/pdf |
| Category | Documents & Text | Documents & Text |
| Full Name | HTML Document (short) | PDF Document |
| Conversion Engine | PANDOC | PANDOC |
| Current version | — | PDF 2.0 (ISO 32000-2:2020) |
| Compression | — | Flate, LZW, JBIG2, JPEG, JPEG 2000 |
| Max file size | — | ~10 GB (practical); 2^31 bytes (theoretical per object) |
| Color models | — | RGB, CMYK, Grayscale, Lab, DeviceN, ICC-based |
| Standard subsets | — | PDF/A, PDF/X, PDF/UA, PDF/E, PDF/VT |
HTM vs PDF — Strengths and limitations
What each format does best, and where it falls short.
HTM Strengths
- Identical content to .html in every respect.
- Universally supported by every browser and server.
- 8.3 compatibility for antique DOS/Windows shares.
Limitations
- No real reason to use .htm over .html in 2026.
- Inconsistent with modern naming conventions.
- Mixed extensions within one site confuse static-site generators.
PDF Strengths
- Pixel-perfect fidelity across operating systems, browsers, and printers.
- Embeds fonts, so documents render identically without the reader having them installed.
- Supports digital signatures, encryption, and redaction for legal workflows.
- ISO-standardized (ISO 32000) with multiple validated subsets (PDF/A, PDF/X, PDF/UA).
- Supports both vector and raster content, keeping line art crisp at any zoom level.
Limitations
- Editing is difficult — the format is optimized for display, not mutation.
- Text extraction can scramble reading order in multi-column layouts.
- File sizes balloon quickly when embedding high-resolution images or fonts.
Quality & Compatibility
LibreOffice handles the heavy lifting and maps the overwhelming majority of HTM features to their PDF equivalents. Standard system fonts (Arial, Calibri, Times, Helvetica) transfer exactly; corporate or custom fonts are substituted with the closest available match, which can shift line breaks by a character or two. Inline images embed at original resolution.
Tips for Best Results
- Embed fonts in the HTM before uploading if you use non-system fonts — it guarantees the PDF renders identically on any viewer.
- Check tables, figure captions and page headers after conversion; complex layouts occasionally need a minor nudge in the target application.
- For documents with a table of contents, refresh the TOC field after opening the PDF so page numbers reflect the new pagination.
Frequently Asked Questions
Yes, as long as the fonts are standard (system fonts or common office fonts like Arial, Calibri, Times, Helvetica). Custom corporate fonts survive if they are embedded in the source document; otherwise the conversion substitutes the closest available match, which can shift line breaks by a character or two.
Yes. Inline images are embedded into the PDF at full resolution, editable tables become native PDF tables, and hyperlinks keep their URLs. Complex features unique to HTM — macros, form fields, track-changes — are mapped where an equivalent exists in PDF and flattened into static content otherwise.
All uploads go over TLS, files are processed in isolated containers and both the source and the output are deleted within two hours. No account is required, file contents are never indexed or used for training, and the paid plan adds a signable data-processing agreement for regulated workflows.
HTML Document (short)
Source formatHTM is an alternative extension for HTML files, functionally identical to .html. Common on older Windows systems.
PDF Document
Target formatPDF is the universal standard for sharing documents with consistent formatting across all devices and operating systems. It preserves fonts, images, and layout exactly as intended by the author.
Common Use Cases
Share across platforms
Send PDF files to anyone without worrying about whether they have the right software for HTM.
Embed in documents
Drop PDF output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
PDF often produces smaller files than HTM for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
HTM vs PDF — Typical file sizes
Approximate file sizes for common scenarios.
- Legacy landing page 5-50 KB
- 1-page text-only memo 50–150 KB
- 10-page report with images 500 KB – 2 MB
- Scanned document (per page) 100 KB – 1 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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