[tomasr78]

Problem

The example already makes the thumbnail in one pdf -> jpg call, but:

• its comment still described the old chain ("extracting first page from PDF and then converting it to JPG using chaining") and linked https://www.convertapi.com/pdf-to-extract. pdf -> extract is now the AI data-extraction converter (spec).
• ScaleImage and ScaleProportions are not pdf -> jpg parameters (spec) and the API ignores them. The 300x300 request came back 300x388 for test.pdf (US Letter), byte for byte the same as without them.

Change

• The comment describes and links only https://www.convertapi.com/pdf-to-jpg.
• ScaleImage and ScaleProportions are dropped. FitToSize keeps the thumbnail inside 300x300 with its aspect ratio: 231x300.

Verification

dotnet build Examples/CreatePdfThumbnail/CreatePdfThumbnail.csproj: build succeeded, 0 warnings.

The example hard-codes "api_token" and a Windows relative path, so I ran a copy of this Program.cs with only those two lines changed: the token from an environment variable and an absolute path to Examples/TestFiles/test.pdf. .NET SDK 10.0.401, production API, 2026-11-06. $TMPDIR is the local temp folder:

$ dotnet run
The thumbnail saved to $TMPDIR/test.jpg

test.jpg is 231x300 px, 8,858 bytes.

Seen while running it, not changed here: the examples reach TestFiles with either ..\..\..\ or ..\..\..\..\, and this one uses three levels. From the build output folder bin\Debug\net10.0, only the four-level form reaches Examples\TestFiles.

Only the example changes, not the library, so there is no CHANGELOG entry.

The thumbnail examples of the other SDKs are fixed in ConvertAPI/convertapi-library-python#61, ConvertAPI/convertapi-library-php#72, ConvertAPI/convertapi-library-ruby#42, ConvertAPI/convertapi-library-java#56, ConvertAPI/convertapi-library-node#123.

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🟢 Approval recommended

No active review issues are reported for the PDF thumbnail example’s sizing and documentation updates.

No open issues 🎉

What changed in this PR

Updates the PDF thumbnail example to use supported sizing parameters and accurately describe its direct PDF-to-JPG conversion.

Changes:

• Replaces unsupported ScaleImage and ScaleProportions parameters with FitToSize to preserve aspect ratio within 300×300 pixels.
• Corrects the comment and removes the obsolete PDF extraction link.

File	Description
Examples/​CreatePdfThumbnail/​Program.cs	Corrects the conversion comment and updates thumbnail sizing parameters.

_{Review effort: Balanced}