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# Description of Changes ## Overview This enhancement adds **true PDF text removal** to RedactController. It changes auto-redaction from visual covering to actual text removal. The feature removes text from True PDFs completely while keeping compatibility with other PDF types. ## Features ### 1. True PDF Text Removal - Removes text from PDF structure instead of just hiding it - No impact to manual redaction or other types of PDFs (e.g.: to searchable PDFs or custom encoded PDFs) ### 2. Advanced Content Stream Processing #### How It Works (only high level overview) - Token Processing: Breaks PDF content into small pieces for exact text finding - Font Tracking: Keeps track of fonts and formatting - Text Operators: Finds PDF commands that show text (`Tj`, `TJ`, `'`, `"`) - Position Mapping: Maps text to exact locations for removal - Rebuilds PDF: Rebuilds PDFs without the text, while keeping formatting operators #### No change for other types PDFs - Because the iteration through the PDF for token/text removal and for box placing are two separate completely methods - This means when the there is custom encoded PDF the token/text removal won't find any text to remove (because there is no logic for decoding for, for now) but the box finding methods still reliably finds redacted words and puts a box onto them. So no change. ### 3. Enhanced TextFinder Integration #### Minor Improvements - Page Grouping: Groups found text by page for faster processing ### JUnit tests for both of files. - Added JUnit tests for both files. - Might need future improvement. ### TODOs - Support for additional PDF types besides true PDFs (currently a WIP), e.g.: searchable PDF/custom encoded PDF - Feature to be expected in few weeks (best case scenario, and only if I succeed), sadly that is significantly harder task so only true PDFs for now ### UI - No UI change for now ### Sample files: [Free_Test_Data_500KB_PDF_redacted.pdf](https://github.com/user-attachments/files/21195841/Free_Test_Data_500KB_PDF_redacted.pdf) [lorem-ipsum_redacted.pdf](https://github.com/user-attachments/files/21195842/lorem-ipsum_redacted.pdf) [true-pdf-sample-1_redacted.pdf](https://github.com/user-attachments/files/21195843/true-pdf-sample-1_redacted.pdf) [true-pdf-sample-2_redacted.pdf](https://github.com/user-attachments/files/21195844/true-pdf-sample-2_redacted.pdf) [true-pdf-sample-3_redacted.pdf](https://github.com/user-attachments/files/21195845/true-pdf-sample-3_redacted.pdf) Closes: does not actually close any issues, since it only works with true PDFs --- ## Checklist ### General - [x] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [x] 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) - [x] I have performed a self-review of my own code - [x] 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) ### 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) - [x] 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. --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
Stirling-PDF
Stirling-PDF is a robust, locally hosted web-based PDF manipulation tool using Docker. It enables you to carry out various operations on PDF files, including splitting, merging, converting, reorganizing, adding images, rotating, compressing, and more. This locally hosted web application has evolved to encompass a comprehensive set of features, addressing all your PDF requirements.
All files and PDFs exist either exclusively on the client side, reside in server memory only during task execution, or temporarily reside in a file solely for the execution of the task. Any file downloaded by the user will have been deleted from the server by that point.
Homepage: https://stirlingpdf.com
All documentation available at https://docs.stirlingpdf.com/
Features
- 50+ PDF Operations
- Parallel file processing and downloads
- Dark mode support
- Custom download options
- Custom 'Pipelines' to run multiple features in a automated queue
- API for integration with external scripts
- Optional Login and Authentication support (see here for documentation)
- Database Backup and Import (see here for documentation)
- Enterprise features like SSO (see here for documentation)
PDF Features
Page Operations
- View and modify PDFs - View multi-page PDFs with custom viewing, sorting, and searching. Plus, on-page edit features like annotating, drawing, and adding text and images. (Using PDF.js with Joxit and Liberation fonts)
- Full interactive GUI for merging/splitting/rotating/moving PDFs and their pages
- Merge multiple PDFs into a single resultant file
- Split PDFs into multiple files at specified page numbers or extract all pages as individual files
- Reorganize PDF pages into different orders
- Rotate PDFs in 90-degree increments
- Remove pages
- Multi-page layout (format PDFs into a multi-paged page)
- Scale page contents size by set percentage
- Adjust contrast
- Crop PDF
- Auto-split PDF (with physically scanned page dividers)
- Extract page(s)
- Convert PDF to a single page
- Overlay PDFs on top of each other
- PDF to a single page
- Split PDF by sections
Conversion Operations
- Convert PDFs to and from images
- Convert any common file to PDF (using LibreOffice)
- Convert PDF to Word/PowerPoint/others (using LibreOffice)
- Convert HTML to PDF
- Convert PDF to XML
- Convert PDF to CSV
- URL to PDF
- Markdown to PDF
Security & Permissions
- Add and remove passwords
- Change/set PDF permissions
- Add watermark(s)
- Certify/sign PDFs
- Sanitize PDFs
- Auto-redact text
Other Operations
- Add/generate/write signatures
- Split by Size or PDF
- Repair PDFs
- Detect and remove blank pages
- Compare two PDFs and show differences in text
- Add images to PDFs
- Compress PDFs to decrease their filesize (using qpdf)
- Extract images from PDF
- Remove images from PDF
- Extract images from scans
- Remove annotations
- Add page numbers
- Auto-rename files by detecting PDF header text
- OCR on PDF (using Tesseract OCR)
- PDF/A conversion (using LibreOffice)
- Edit metadata
- Flatten PDFs
- Get all information on a PDF to view or export as JSON
- Show/detect embedded JavaScript
📖 Get Started
Visit our comprehensive documentation at docs.stirlingpdf.com for:
- Installation guides for all platforms
- Configuration options
- Feature documentation
- API reference
- Security setup
- Enterprise features
Supported Languages
Stirling-PDF currently supports 40 languages!
| Language | Progress |
|---|---|
| Arabic (العربية) (ar_AR) | |
| Azerbaijani (Azərbaycan Dili) (az_AZ) | |
| Basque (Euskara) (eu_ES) | |
| Bulgarian (Български) (bg_BG) | |
| Catalan (Català) (ca_CA) | |
| Croatian (Hrvatski) (hr_HR) | |
| Czech (Česky) (cs_CZ) | |
| Danish (Dansk) (da_DK) | |
| Dutch (Nederlands) (nl_NL) | |
| English (English) (en_GB) | |
| English (US) (en_US) | |
| French (Français) (fr_FR) | |
| German (Deutsch) (de_DE) | |
| Greek (Ελληνικά) (el_GR) | |
| Hindi (हिंदी) (hi_IN) | |
| Hungarian (Magyar) (hu_HU) | |
| Indonesian (Bahasa Indonesia) (id_ID) | |
| Irish (Gaeilge) (ga_IE) | |
| Italian (Italiano) (it_IT) | |
| Japanese (日本語) (ja_JP) | |
| Korean (한국어) (ko_KR) | |
| Norwegian (Norsk) (no_NB) | |
| Persian (فارسی) (fa_IR) | |
| Polish (Polski) (pl_PL) | |
| Portuguese (Português) (pt_PT) | |
| Portuguese Brazilian (Português) (pt_BR) | |
| Romanian (Română) (ro_RO) | |
| Russian (Русский) (ru_RU) | |
| Serbian Latin alphabet (Srpski) (sr_LATN_RS) | |
| Simplified Chinese (简体中文) (zh_CN) | |
| Slovakian (Slovensky) (sk_SK) | |
| Slovenian (Slovenščina) (sl_SI) | |
| Spanish (Español) (es_ES) | |
| Swedish (Svenska) (sv_SE) | |
| Thai (ไทย) (th_TH) | |
| Tibetan (བོད་ཡིག་) (bo_CN) | |
| Traditional Chinese (繁體中文) (zh_TW) | |
| Turkish (Türkçe) (tr_TR) | |
| Ukrainian (Українська) (uk_UA) | |
| Vietnamese (Tiếng Việt) (vi_VN) | |
| Malayalam (മലയാളം) (ml_IN) |
Stirling PDF Enterprise
Stirling PDF offers an Enterprise edition of its software. This is the same great software but with added features, support and comforts. Check out our Enterprise docs
🤝 Looking to contribute?
Join our community: