# Description of Changes
This pull request adds support for converting PDF files to PDF/X format
in the frontend, alongside the existing PDF/A conversion. The changes
include UI updates, translation strings, configuration, and processing
logic to enable PDF to PDF/X conversion using the same backend endpoint
as PDF/A, with appropriate user options and warnings.
**PDF/X Conversion Support:**
- Added a new `ConvertToPdfxSettings` component for configuring PDF/X
conversion options, including output format selection and digital
signature warnings.
(`frontend/src/core/components/tools/convert/ConvertToPdfxSettings.tsx`)
- Updated the conversion settings UI to display PDF/X options when
converting from PDF to PDF/X.
(`frontend/src/core/components/tools/convert/ConvertSettings.tsx`)
**Configuration and Processing Logic:**
- Extended conversion constants and parameters to recognize PDF/X as a
target format, map it to the PDF/A backend endpoint, and ensure correct
file naming and processing behavior.
(`frontend/src/core/constants/convertConstants.ts`,
`frontend/src/core/hooks/tools/convert/useConvertOperation.ts`,
`frontend/src/core/hooks/tools/convert/useConvertParameters.ts`)
- Ensured that PDF/X conversions are processed separately per file,
similar to PDF/A.
(`frontend/src/core/hooks/tools/convert/useConvertOperation.ts`)
**UI and Translation Updates:**
- Updated translation strings to include PDF/X options, descriptions,
and warnings. (`frontend/public/locales/en-GB/translation.toml`)
<img width="366" height="998" alt="image"
src="https://github.com/user-attachments/assets/b28fa095-9350-4db2-a0b5-bddcf003fa46"
/>
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---
## Checklist
### General
- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings
### Documentation
- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)
### Translations (if applicable)
- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)
### UI Changes (if applicable)
- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)
### Testing (if applicable)
- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.
---------
Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
