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WMF → PDF
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Fast, secure WMF to PDF conversion. No registration required.
WMF is a raster image format with its own balance of compression, colour depth, and software support. That is why users land on this page looking for a PDF copy. Need your WMF as a PDF? Upload the image; we emit a document with the WMF placed on page 1 at an appropriate size. Multi-image WMF uploads produce multi-page PDF output — one image per page. Context: WMF is a raster image format with its own balance of compression, colour depth, and software support. PDF is Adobe's Portable Document Format, the fixed-layout standard for shareable documents.
Windows Metafile
Source formatWMF (Windows Metafile) is a legacy Windows vector graphics format.
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.
Why convert WMF to PDF
A PDF carries metadata (author, date, title) that images lack. Document management systems index on those fields; sending a bare WMF means losing all that context by the time the file lands in search.
HOW TO CONVERT
WMF → PDF
Provide the WMF
Drag-and-drop an image up to 25 MB on the free tier. PNG, JPG, HEIC and WebP sources all work.
Wrap into PDF
We emit a PDF document with the image placed on a page, optional filename caption and preserved resolution.
Retrieve the output
Click to download; the PDF opens in any reader, prints consistently and can be signed digitally.
Common Use Cases
Share across platforms
Send PDF files to anyone without worrying about whether they have the right software for WMF.
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 WMF 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.
WMF vs PDF — Strengths and limitations
What each format does best, and where it falls short.
WMF Strengths
- Native Windows vector format.
- Efficient for line-art and diagrammatic images.
- Preserved in Office clipboard workflows.
Limitations
- Windows-only — poor Mac and Linux support.
- 2005 security vulnerability eroded trust.
- 16-bit coordinates in original WMF limit canvas size.
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.
WMF vs PDF — Technical specifications
Side-by-side comparison of the technical details.
WMF
- MIME type
- image/wmf
- Extension
- .wmf
- Container
- Sequence of GDI drawing records
- Successors
- .emf (1993), .emf+ / .emfx (2000)
- Related spec
- [MS-WMF] (Microsoft Open Specifications)
- MIME type
- application/pdf
- 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 | WMF | |
|---|---|---|
| MIME type | image/wmf | application/pdf |
| Extension | .wmf | — |
| Container | Sequence of GDI drawing records | — |
| Successors | .emf (1993), .emf+ / .emfx (2000) | — |
| Related spec | [MS-WMF] (Microsoft Open Specifications) | — |
| 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 |
WMF vs PDF — Typical file sizes
Approximate file sizes for common scenarios.
WMF
- Simple clipart 5-50 KB
- Detailed vector drawing 50-500 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
- Full-color magazine (48 pages) 10–40 MB
Quality & Compatibility
DPI metadata from the WMF is used to compute the image's on-page size in the PDF. A 300-DPI photo of a 4x6 receipt lands as a 4x6-inch image on the page; override with "fit to page" in Advanced if you want it to fill the page instead.
Tips for Best Results
- Multi-page PDF beats zipping many single-page PDFs for email attachment and most portal uploads.
- Set page size (A4 / Letter / custom) in Advanced to match the destination printer's default, avoiding margin surprises.
- For high-resolution scans, output a larger PDF rather than downscaling — the document management system can render at any zoom.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Minimally. When the image encoding carries directly into the PDF (JPEG into PDF for example), pixels are stream-copied and quality is bit-exact. When re-encoding is required, we use high-quality defaults that are visually indistinguishable from the source on typical viewing conditions.
Uploads run over HTTPS, files are processed in isolated containers, and both the source WMF and the PDF output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
Yes. Upload multiple images (or a ZIP) and the pipeline produces a multi-page PDF with one image per page, ordered by filename. Advanced options control page size, orientation per page and whether captions are inserted.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
A4 portrait by default — the global mainstream. Switch to Letter or any custom dimensions in Advanced. You can also select "match image" so the PDF page size tracks the WMF aspect ratio exactly, eliminating white margins for custom printing.
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
PDF/X: The Complete Guide to Print-Ready PDF Standards
Complete guide to PDF/X standards: X-1a vs X-3 vs X-4 differences, required elements, OutputIntent and FOGRA39 profiles, TrimBox/BleedBox page geometry, ink coverage limits, Ghostscript conversion commands, and VeraPDF validation.
Read guidePDF/A: The ISO Standard for Long-Term Document Archival
Complete guide to PDF/A archival format: PDF/A-1/2/3/4 conformance levels, prohibited features, font embedding requirements, Ghostscript conversion, VeraPDF validation, and industry use cases.
Read guidePDF Format: Complete Technical Guide to Portable Documents, Forms, Signatures & Encryption
Learn PDF (Portable Document Format): Document structure, object types, cross-reference table, content streams, compression, encryption, digital signatures, form fields.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.