gImageReader
Desktop GUI that runs the Tesseract OCR engine over images and PDFs.
Opens the vendor's own site.
Jobs covered
Open a task to see exactly what the vendor documentation supports.
OCR
Browse all ocr toolsrecognising text in images and PDF documents with gImageReader, which the project describes as a Gtk and Qt front end to tesseract-ocr, importing images and PDFs from disk, scanning devices, the clipboard and screenshots, defining the recognition area manually or automatically, processing multiple images and documents in one go, and recognising to plain text or to hOCR with the recognised text displayed next to the image for post-processing including spell checking
Convert
Browse all convert toolsgenerating a PDF from hOCR recognition output, either as a reconstructed document or as the source image with an invisible selectable text layer; not arbitrary input or output conversion
Where your files are processed
No server involved
Installed desktop application linking against a locally installed Tesseract. No service, no upload, no account.
It is a desktop application, so recognition runs on the machine that installed it, and its architecture is local rather than a service. That is the documented design and not an audit: this review did not capture traffic, and dependency downloads, network storage and the packaging on a given distribution are outside what it establishes.
What it does
A desktop graphical front-end that drives the Tesseract OCR engine. It imports images and PDFs from disk, a scanner, the clipboard or a screenshot, lets you define recognition areas manually or automatically, and shows the recognised text beside the page.
Output can be plain text, hOCR, or a searchable PDF generated from hOCR, with a spellcheck step before export. Recognition runs against your own Tesseract installation.
Best for
Linux and Windows users who want a visual, batch-friendly way to run Tesseract over scans and image-only PDFs without memorising command-line flags.
Worth knowing
Graphical only, with no command line or API of its own, so automation means scripting Tesseract directly. There is no macOS build, no redaction and no general PDF editing, and OCR quality plus available languages depend entirely on which Tesseract version and language data you install separately.
The Tesseract library version is tied to the build or package you install, and installing a different executable on its own does not necessarily change the OCR engine the application links against. Graphical only is what the project documents; the absence of a documented API is not proof that every command-line capability is absent.
Details, and where each comes from
Vendor statements, our own reading of their pages, and the things nobody has established yet, each answered separately. Where we have not confirmed something it says so rather than guessing, and a row nobody has established is greyed out.
- Versions covered
- Windows · Linux
- Website
- github.com
- Requires an account
- No
- Watermark on the free tier
- No
- Maximum file size
- Not verified
- Batch processing
- Yes
- Data residency
- Not verified
- Open source
- Yes
- Self-hostable
- Yes
- Licence
- GPL-3.0
- Redaction
- No redaction feature
- Programmatic access
- None
- Last availability check
- Responded in 419 ms 21 October 2026
Checked automatically by our own runner, not reported by the vendor. 100% of our last 30 checks got a response.
What the redaction verdict rests on
From the vendor's own documentation, read 22 September 2026. Not tested by us.
What that does not establish
The vendor’s own site was read on 22 September 2026 and contains no mention of redaction, sanitisation, blackout or whiteout. Absence from a vendor’s own material is not proof that a feature does not exist - it may be undocumented, or on a page the reading did not reach - but for a NEGATIVE claim it is the strongest evidence available, and it is weaker than a positive quote.
Recorded as such rather than presented as certainty.
What the vendor says
Claims are labelled rather than repeated as fact. Where we have checked something ourselves, it says so and shows when. Checked means we read the vendor's own page and it says what we recorded - not that we tested the behaviour, unless the note says we did.
-
“gImageReader is a simple Gtk/Qt front-end to tesseract-ocr.”
Checked by us - the source says this Read 22 September 2026
Confirmed verbatim: the sentence is the README's opening description. It is a scope statement and a modest one - gImageReader is a front-end, so the OCR is Tesseract's and the accuracy is Tesseract's, which is a useful division for a reader choosing between them.
Tesseract.js, verified in this batch, wraps the same engine for the browser and is equally explicit that it does not modify the recognition model. So the index now records three ways of reaching Tesseract - this desktop front-end, the browser wrapper, and the engine itself - with each saying where the boundary lies.
Standing: Re-read and matched byte for byte
Check it yourself: the source, the SHA-256, and how we checked
- From
- the text a browser renders
- SHA-256
- 3f6f2370090f9d6f0947f542597787bfd8736cf9b360ee7bb47baae6c24ed426
How we checked
Re-verified verbatim on 2026-09-22: https://github.com/manisandro/gImageReader re-rendered in headless Chrome with scripts/render-page.mjs and the claim's wording found in the rendered text. Originally verified on 2026-09-21. sourceHash is the SHA-256 of the re-rendered text, held as rv-github-com-manisandro-gImageReader-1d65499e.txt.
Each claim is quoted from the vendor's own pages. This section describes what we have and have not checked - it is not a judgement about anyone.
Sponsorship is distribution, not an endorsement or a promise of search rankings, AI citations, traffic, or sales. This listing is a free entry, compiled from published sources.
Related reading
- Which PDF tools keep your file on your machine - what we count as processing on your own device.
- Open source PDF tools, and what their licences require - what open source does and does not tell you.