gImageReader
gImageReader 3.4.3 is a cross-platform graphical interface for Tesseract OCR. It imports images, PDFs, scans, clipboard captures and screenshots, supports batch recognition and region selection, and exports text, hOCR or searchable PDFs.
Import and recognition workflow
gImageReader brings Tesseract's command-line OCR into a graphical workflow for scanned pages, image-only PDFs, screenshots and scanner input. It helps divide regions, process batches, compare text with the source and organize hOCR, but it is not a handwriting-recognition, complex-table reconstruction or perfect-layout tool.
Version and platform coverage
Version 3.4.3 provides Qt 6 Windows x86 and x64 installers and portable packages, while Linux users can choose distribution packages, Flatpak or a source build. The release fixes dictionary mapping, PDF printing, Qt selection behavior and hOCR-tree crashes. The published package set does not include a ready-made macOS build.
Accuracy and data boundaries
Recognition is performed by Tesseract and the selected language data. Rotation, resolution, columns, fonts and region order affect the result. Plain text loses layout; hOCR and searchable PDFs preserve coordinates only approximately and still require proofreading. Software licensing does not change the privacy, copyright or confidentiality requirements of the source documents.
Review date: 2026-08-06.
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gImageReader 3.4.3 installation, multilingual OCR and searchable PDF guide
Install the build and Tesseract language data for the target system, validate orientation, columns and regions on a few clear pages, proofread the result and save the original beside text, hOCR or searchable PDF outputs.
Before you start
- Choose a supported Windows 32-bit or 64-bit build or a Linux package, and test Qt 6 compatibility on older systems before a broad rollout.
- Prepare copies of the source images or PDFs with correct orientation, adequate contrast and clear text edges; keep unique originals untouched.
- Install Tesseract and the required language data. Mixed Chinese and English pages may need both languages, but more languages do not automatically improve accuracy.
Installation steps
- 01
Install the application and OCR engine
Select the Windows x86 or x64 installer or portable package, or a Linux package or Flatpak, then confirm the Tesseract executable, version and language list after launch.
- 02
Import a small sample and set languages
Load two or three representative pages, correct orientation and crop, choose the primary language and page-segmentation mode, and run automatic region detection.
- 03
Verify each output path
Test plain text and hOCR separately, inspect names, numbers, tables and paragraph order, then generate a sample PDF and verify search, copy and print behavior.
Quick start
- 01
Divide recognition regions
Automatic detection can start a single-column page, but columns, captions, headers, footers and tables should be split manually and checked in reading order.
- 02
Recognize and proofread line by line
Compare the result beside the source, use spell checking to find suspicious words, and review names, terms, identifiers and amounts against the image.
- 03
Export while preserving the source
Save text, hOCR or searchable PDF for the intended use, retain the original, language settings and correction notes, and have a second person sample-check important records.
Usage tips
- Version 3.4.3 fixes dictionary mapping, PDF printing, blank Qt selections and hOCR-tree crashes, and moves Windows builds to Qt 6.
- OCR is probabilistic rather than proof of the source text. Compare amounts, dates, identifiers, formulas and footnotes with the page image.
- Process large PDFs in batches to avoid exhausting memory; stabilize language, segmentation and preprocessing parameters before batch application.
- Scans may contain personal or copyrighted information. Restrict source files, temporary directories and exported copies even when processing stays local.
Troubleshooting and uninstall
Why is Chinese or another language missing from the list?
Check the Tesseract data directory and the exact Tesseract instance used by the application, install the matching training data and restart. Portable, system and sandbox packages may read different directories.
Why does a PDF print or export incorrectly?
Confirm version 3.4.3, retest with a few pages and default settings, check that the source is not encrypted or damaged, and inspect disk space and write permissions before splitting complex pages.
- Archive results and recognition parametersKeep originals, final text or PDF, language selections and required hOCR projects, and open the exports independently before clearing temporary work data.
- Remove the app and optional language dataUninstall the application or remove its portable directory; keep shared Tesseract data when another OCR tool depends on it, and delete caches only after checking those dependencies.
Frequently asked questions
Is gImageReader itself the OCR engine?
No. It imports sources, divides regions, calls the recognition engine, supports proofreading and exports. Tesseract and its installed language data determine language coverage and much of the recognition quality.
Why does Chinese text contain many errors?
Check Simplified or Traditional Chinese data, orientation, resolution, contrast, columns and region boundaries. Low-quality compression, decorative or vertical text and complex tables can all reduce accuracy.
Does searchable PDF output change the original page?
The exported PDF usually combines a page image with a text layer, so its appearance may be similar, but coordinates, replacement fonts, compression and page size still need checking. Preserve the original for records.