SUNDATA TOOLS

PRACTICAL GUIDES

Understand what happens to your file

These guides explain what each tool changes, what it cannot preserve and how to choose settings for the job.

The smallest file is not always the best result. Use these notes to balance size, readability, editability and privacy.

Image compression & formatsJPG, PNG and WebP, plus a sensible order for reducing sizePDF compressionWhen rasterizing works and what features it removesPDF to OfficeWhat to expect from Word, Excel and PowerPoint outputUS passport photosA practical 2×2 inch checklist35×45mm photosCommon passport and visa photo basicsJapanese passport photosJapanese-language 35×45mm guidance

Written and tested by SunData Service Co., Ltd. Each guide reflects the implemented behavior of SunData Tools and hands-on browser testing. Last updated September 28, 2026.