VSDX → PNG renders each Visio page as a crisp image with white paper behind it, which is what Confluence, Jira and slide decks want when nobody else has Visio.
From real runs
| Element | Result | What happens |
|---|---|---|
| One image per page | Kept | The 13-page process document came back as a ZIP of 13 PNGs named page-1 to page-13; a single-page architecture map came back as one PNG with no archive. |
| Pixel size | Changed | Pages render at 144 DPI: a 21.5 × 16.5 inch architecture map became 3096 × 2376 pixels and an A4 portrait page 1191 × 1684. Use width when a wiki column needs a fixed size. |
| Line work and connectors | Kept | Thin connector lines and arrowheads stay sharp because PNG is lossless; the routed lines between ring diagrams were still one pixel clean at 144 DPI. |
| Labels | Changed | Shape text becomes pixels in the substitute font. Nobody can search or copy a server name out of the image, so keep the PDF for reference copies. |
| Mixed page sizes | Kept | In the four-page plan the A4 cover rendered at 1191 × 1684 pixels and the large planning sheet at its own, far larger size; small pages are not padded out to the big one. |
| Theme-only shapes | Lost | Shapes that are missing in the PDF step are missing from the image too; the PNG is a picture of the converted page, not of what Visio shows. |
| Background | Changed | Every page is opaque white. A Visio page with no fill does not become a transparent PNG. |
The 13-page process document came back as a ZIP of 13 PNGs named page-1 to page-13; a single-page architecture map came back as one PNG with no archive.
Pages render at 144 DPI: a 21.5 × 16.5 inch architecture map became 3096 × 2376 pixels and an A4 portrait page 1191 × 1684. Use width when a wiki column needs a fixed size.
Thin connector lines and arrowheads stay sharp because PNG is lossless; the routed lines between ring diagrams were still one pixel clean at 144 DPI.
Shape text becomes pixels in the substitute font. Nobody can search or copy a server name out of the image, so keep the PDF for reference copies.
In the four-page plan the A4 cover rendered at 1191 × 1684 pixels and the large planning sheet at its own, far larger size; small pages are not padded out to the big one.
Shapes that are missing in the PDF step are missing from the image too; the PNG is a picture of the converted page, not of what Visio shows.
Every page is opaque white. A Visio page with no fill does not become a transparent PNG.
We converted our Microsoft Visio sample (233 KB) with Office engine → Image engine on 2026-10-20. It took 3.9 s and produced a 180 KB PNG file, 23% smaller than the input. The engine raised 3 warnings, listed below.
Input · sample.vsdx · 233 KB
ZIP with 64 parts
Output · sample.zip · 180 KB
ZIP with 4 page images (sample-page-1.png … sample-page-4.png)
LibreOffice and pdftoppm
soffice --headless --convert-to pdf diagram.vsdx && pdftoppm -png -r 144 diagram.pdf pageAsking soffice for png directly writes only the first page at 96 DPI. Going through PDF gives every page.
The HTTP API and the MCP server run the exact engine this page uses (Office engine → Image engine); the response carries the same warnings the web converter shows. Check support first with GET /api/v1/pairs?from=vsdx&to=png.
curl -X POST https://filetypeconverters.com/api/v1/convert \
-H "Authorization: Bearer $FTC_API_KEY" \
-F "file=@input.vsdx" -F "from=vsdx" -F "to=png" \
-F 'options={"width":0}' \
--output output.png| Key | Applies to | Type | Default |
|---|---|---|---|
| width | Writing PNG | number | 0 |
| height | Writing PNG | number | 0 |
| fit | Writing PNG | contain · cover · fill | contain |
| quality | Writing PNG | number | 90 |
| background | Writing PNG | string | #ffffff |
| stripMetadata | Writing PNG | boolean | true |
Neither renders .vsdx attachments inline without a plugin. Convert to PNG, set width to the column width you use, and attach the image; keep the .vsdx next to it for whoever edits the diagram later.
Your drawing has more than one page and each page is a separate image. The ZIP keeps them in tab order; use max_pages 1 if you only want the first page.
Large sheets give large images: a 32 × 22.8 inch planning page renders at roughly 4600 × 3300 pixels at 144 DPI. Set width to cap it, or lower dpi.