docs: reflect bundled Tesseract on every install surface

- NEW LICENSE_TESSERACT.txt at the repo root: header noting it covers
  the bundled Tesseract OCR binary (Apache 2.0, upstream
  tesseract-ocr/tesseract, copyright Google + contributors) and the
  eng.traineddata from tessdata_best (also Apache 2.0). Clarifies
  DataTools itself remains proprietary. Full canonical Apache 2.0
  license text included.
- README.md + README.es.md (Download section): bumped size estimate
  ~200 MB → ~300 MB, added a short paragraph stating Tesseract OCR
  is bundled (no separate install required), with a link to the new
  license file.
- docs/USER-GUIDE.md + docs/USER-GUIDE.es.md (§1.6 System
  requirements): bumped disk estimate, added a paragraph stating
  Tesseract 5.5 + eng.traineddata ship inside every installer /
  portable / AppImage, with a source-install fallback hint pointing
  developers to DEVELOPER.md.
- docs/DEVELOPER.md: new "PDF Extractor — bundled Tesseract" section
  documenting the runtime layout (sys._MEIPASS / tesseract / …),
  discovery order, source of bytes (build/vendor/tessdata + per-
  platform fetch in make_release.py), version pin, update recipe.
- docs/TECHNICAL.md: new §3.10 "Bundled Tesseract (PDF Extractor
  OCR)" — short version of the discovery order for the build
  pipeline section.
- build/README.md: distribution-outputs paragraph now lists
  Tesseract among bundled deps with the ~250-300 MB estimate; new
  "Tesseract bundling" section: layout diagram, resolver order,
  source of bytes + 5.5.0 pin, update steps, license-file ref.

Out-of-scope gaps noted by the docs sweep:
- docs/FUTURE-TOOLS.md §D still describes Tesseract bundling as a
  high-risk packaging headache; now superseded. Worth a one-line
  "(resolved — bundled as of v1.x)" callout in a future pass.
- USER-GUIDE §2 "What's included" table doesn't list PDF Extractor
  at all (it shipped in b8aff86…967d3f6). Separate gap to close.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

LICENSE_TESSERACT.txt

@@ -0,0 +1,220 @@
+This license applies to the bundled Tesseract OCR binary distributed
+inside DataTools installer artifacts (Windows .exe, macOS .dmg, Linux
+.AppImage) and the corresponding portable .zip downloads.
+
+Tesseract OCR upstream:  https://github.com/tesseract-ocr/tesseract
+Copyright (C) 2006-2024  Google Inc. and the Tesseract OCR contributors
+
+The Tesseract OCR binary is distributed under the Apache License,
+Version 2.0, the full text of which is reproduced verbatim below.
+
+The bundled `eng.traineddata` data file is the "best" English model
+from https://github.com/tesseract-ocr/tessdata_best and is licensed
+under the Apache License, Version 2.0 as well.
+
+DataTools itself is proprietary and is NOT covered by this license;
+see LICENSE.txt at the repository root for DataTools' own license.
+
+================================================================================
+
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README.es.md

@@ -30,7 +30,9 @@ Paquetes precompilados — sin instalar Python, sin permisos de administrador, s
 | **Windows** | `DataTools-X.Y.Z-win-setup.exe` — ejecuta el instalador (por usuario, sin admin). Crea acceso directo en el escritorio + entrada en el menú Inicio. | `DataTools-X.Y.Z-win-portable.zip` — descomprime donde quieras, doble clic en `DataTools.exe`. |
 | **Linux** | `DataTools-X.Y.Z-linux-x86_64.AppImage` — `chmod +x` y doble clic. | El AppImage ya es portable. |
 
-Última versión: consulta [GitHub Releases](https://git.invixiom.com/giteadmin/datatools-dev/releases) (o el listado de Gumroad). Cada paquete ocupa ~200 MB descomprimido; al primer arranque la app levanta un servidor local en http://127.0.0.1:8501 y abre tu navegador predeterminado. Nada sale de tu equipo — instalador y portable son idénticos por dentro.
+Última versión: consulta [GitHub Releases](https://git.invixiom.com/giteadmin/datatools-dev/releases) (o el listado de Gumroad). Cada paquete ocupa ~300 MB descomprimido; al primer arranque la app levanta un servidor local en http://127.0.0.1:8501 y abre tu navegador predeterminado. Nada sale de tu equipo — instalador y portable son idénticos por dentro.
+
+**Tesseract OCR viene incluido.** El soporte para PDFs escaneados del Extractor de PDF funciona sin configuración adicional en las tres plataformas — no hace falta instalar Tesseract por separado. Atribución de licencia: ver [`LICENSE_TESSERACT.txt`](LICENSE_TESSERACT.txt).
 
 **Avisos del primer arranque (una sola vez):**
 - **macOS** sin firma: clic derecho → **Abrir** → confirma. (Las compilaciones firmadas se lo saltan.)

README.md

@@ -30,7 +30,9 @@ Pre-built bundles — no Python install, no admin rights, no internet at runtime
 | **Windows** | `DataTools-X.Y.Z-win-setup.exe` — run installer (per-user, no admin). Desktop shortcut + Start Menu entry created. | `DataTools-X.Y.Z-win-portable.zip` — unzip anywhere, double-click `DataTools.exe`. |
 | **Linux** | `DataTools-X.Y.Z-linux-x86_64.AppImage` — `chmod +x`, double-click. | The AppImage is already portable. |
 
-Latest release: see [GitHub Releases](https://git.invixiom.com/giteadmin/datatools-dev/releases) (or the Gumroad listing). Each bundle is ~200 MB unpacked; on first launch the app starts a local server at http://127.0.0.1:8501 and opens your default browser. Nothing leaves your machine — installers and portables are byte-identical inside.
+Latest release: see [GitHub Releases](https://git.invixiom.com/giteadmin/datatools-dev/releases) (or the Gumroad listing). Each bundle is ~300 MB unpacked; on first launch the app starts a local server at http://127.0.0.1:8501 and opens your default browser. Nothing leaves your machine — installers and portables are byte-identical inside.
+
+**Tesseract OCR is bundled.** Scanned-PDF support in the PDF Extractor works out of the box on all three platforms — no separate Tesseract install required. License attribution: see [`LICENSE_TESSERACT.txt`](LICENSE_TESSERACT.txt).
 
 **First-launch warnings (one-time):**
 - **macOS** unsigned builds: right-click → **Open** → confirm. (Signed builds skip this.)

build/README.md

@@ -54,8 +54,11 @@ for buyers (or IT-locked-down machines) that can't run installers:
 | Linux    | `DataTools-<ver>-linux-x86_64.AppImage`| (the AppImage IS the portable)                 |
 
 All six outputs are self-contained: every dependency (Python, pandas,
-streamlit, pdfplumber, the lot) is frozen into the bundle. The buyer
+streamlit, pdfplumber, **Tesseract OCR + `eng.traineddata`**, the lot)
-does not need to install Python, pip, or anything else first.
+is frozen into the bundle. The buyer does not need to install Python,
+pip, Tesseract, or anything else first. With Tesseract bundled, each
+artifact is roughly **250–300 MB** on disk (up from ~120 MB pre-OCR);
+unpacked installs run ~300–400 MB once scratch space is counted.
 
 ## Easy-launch surface
 
@@ -287,6 +290,56 @@ Mac code-signing in CI requires the cert + private key as a GitHub
 secret (encoded with `base64`). Detailed walkthrough belongs in a
 later doc — for v1, sign locally and upload to GitHub Releases.
 
+## Tesseract bundling (PDF Extractor OCR)
+
+Frozen artifacts ship a per-platform Tesseract binary plus the English
+`eng.traineddata` model so scanned-PDF support in the PDF Extractor
+works out of the box — no separate user install. Source / pip
+developer setups still need system Tesseract on `PATH`.
+
+**Layout inside the bundle**:
+
+```
+DataTools/                  (or DataTools.app/Contents/MacOS/)
+└── tesseract/
+    ├── tesseract           (Linux/macOS binary; tesseract.exe on Windows)
+    └── tessdata/
+        └── eng.traineddata
+```
+
+The runtime resolver (in `src/`, owned by the runtime team) walks:
+
+1. `DATATOOLS_TESSERACT_BIN` env var override.
+2. `Path(sys._MEIPASS) / "tesseract" / "tesseract[.exe]"` — frozen
+   bundles only.
+3. `tesseract` on `PATH`.
+4. Windows well-known paths.
+
+**Where the bytes come from**:
+
+- **Tessdata** — vendored in-repo at `build/vendor/tessdata/eng.traineddata`
+  (sourced from [tessdata_best](https://github.com/tesseract-ocr/tessdata_best)).
+  `datatools.spec` copies it into `tesseract/tessdata/`.
+- **Binary** — fetched per-platform at build time by
+  `build/make_release.py` from pinned upstream URLs. Current pin:
+  **Tesseract 5.5.0**.
+
+**Updating Tesseract**:
+
+1. Bump the version pin and the per-platform fetch URLs in
+   `build/make_release.py`.
+2. If the model schema changed upstream, refresh
+   `build/vendor/tessdata/eng.traineddata` from `tessdata_best` at the
+   matching tag.
+3. Rebuild on each platform (`python build/make_release.py`) and
+   smoke-test a scanned PDF through the PDF Extractor.
+4. Update `LICENSE_TESSERACT.txt` at the repo root if upstream license
+   terms change (Apache-2.0 today).
+
+License attribution for the bundled binary lives at
+`LICENSE_TESSERACT.txt` at the repo root — it must ship alongside any
+binary that contains Tesseract.
+
 ## Common pitfalls
 
 | Symptom | Fix |

docs/DEVELOPER.md

@@ -296,6 +296,37 @@ GUI / CLI handlers: use `format_for_user(exc, context="...")` to render.
 
 All `DataToolsError` subclasses extend stdlib `ValueError` or `OSError` so existing handlers still catch them.
 
+## PDF Extractor — bundled Tesseract
+
+Frozen builds (installer / portable .zip / AppImage) ship Tesseract OCR inside the bundle so scanned PDFs work without a separate system install. Source / `pip` developer environments still resolve Tesseract from `PATH`.
+
+**Runtime layout (frozen bundles)**:
+
+| Resource | Path |
+|---|---|
+| Tesseract binary | `Path(sys._MEIPASS) / "tesseract" / "tesseract"` (Linux/macOS), `…/tesseract/tesseract.exe` (Windows) |
+| Tessdata directory | `Path(sys._MEIPASS) / "tesseract" / "tessdata"` |
+| English model | `Path(sys._MEIPASS) / "tesseract" / "tessdata" / "eng.traineddata"` |
+
+**Discovery order** (PDF Extractor runtime):
+
+1. `DATATOOLS_TESSERACT_BIN` env var (override — explicit path to a `tesseract` binary).
+2. Bundled path under `sys._MEIPASS` (frozen bundles only — falls through to step 3 otherwise).
+3. `tesseract` on `PATH` (developer setups, source checkouts).
+4. Windows well-known locations (`C:\Program Files\Tesseract-OCR\tesseract.exe`, etc.).
+
+**Where the bytes come from**:
+
+- **Tessdata** is vendored at `build/vendor/tessdata/eng.traineddata` — the "best" English model from [tessdata_best](https://github.com/tesseract-ocr/tessdata_best). PyInstaller's spec copies it into `tesseract/tessdata/` inside the bundle.
+- **Tesseract binary** is fetched at build time by `build/make_release.py` — per-platform download URLs are pinned in that script. The current pin is **Tesseract 5.5.0**.
+
+**To update Tesseract**:
+
+1. Bump the version pin + the per-platform fetch URLs in `build/make_release.py`.
+2. If upstream changed the `eng.traineddata` schema, refresh `build/vendor/tessdata/eng.traineddata` from `tessdata_best` at the matching tag.
+3. Rebuild on each platform (`python build/make_release.py`) and smoke-test a scanned-PDF run through the PDF Extractor before tagging the release.
+4. Update `LICENSE_TESSERACT.txt` at the repo root if the upstream license terms change (Tesseract is Apache-2.0 today).
+
 ## Tests
 
 ```bash

docs/TECHNICAL.md

@@ -122,6 +122,17 @@ Tag a release → 3 platform artifacts upload to GitHub Releases. Manual: copy t
 
 `demo/streamlit_app.py` → Streamlit Community Cloud. Configure deployment in Streamlit UI. Custom domain via CNAME (verify policy at deploy time). Fall back to $5/mo VPS if rate limits / branding constraints hit.
 
+### 3.10 Bundled Tesseract (PDF Extractor OCR)
+
+Frozen builds ship Tesseract 5.5 + `eng.traineddata` inside the PyInstaller bundle so scanned PDFs work without a separate install. Per-platform binary URLs pinned in `build/make_release.py`; tessdata vendored at `build/vendor/tessdata/eng.traineddata`. License attribution in `LICENSE_TESSERACT.txt` at the repo root.
+
+**Discovery order at runtime** (see `docs/DEVELOPER.md` for the full Path layout):
+
+1. `DATATOOLS_TESSERACT_BIN` env var override.
+2. Bundled path under `sys._MEIPASS / "tesseract" /` (frozen bundles only).
+3. `tesseract` on `PATH` (source / pip developer environments).
+4. Windows well-known locations.
+
 ## 4. Libraries
 
 | Purpose | Library |

docs/USER-GUIDE.es.md

@@ -103,7 +103,9 @@ La ventana del lanzador queda abierta en segundo plano. Cerrarla detiene el serv
 
 - Windows 10/11 (64 bits), macOS 11+, Linux moderno (2020+).
 - Navegador moderno (Chrome, Edge, Firefox, Safari, últimos 3 años).
-- ~400 MB de espacio libre en disco (el paquete ocupa ~200 MB; el resto es espacio de trabajo para CSV grandes).
+- ~500 MB de espacio libre en disco (el paquete ocupa ~300 MB; el resto es espacio de trabajo para CSV grandes).
+
+**OCR para PDFs escaneados viene incluido** — Tesseract 5.5 y el modelo en inglés `eng.traineddata` vienen dentro de cada instalador / portable / AppImage. La ruta de extracción de PDFs escaneados del Extractor de PDF funciona sin configuración adicional; no hace falta instalar nada por separado. (Quien ejecute desde un checkout con `pip install -r requirements.txt` sigue necesitando Tesseract del sistema en el `PATH` — ver [DEVELOPER.md §PDF Extractor — bundled Tesseract](DEVELOPER.md#pdf-extractor--bundled-tesseract) (solo en inglés).)
 
 Matriz de soporte completa: [REQUIREMENTS.md](REQUIREMENTS.md) (solo en inglés).
 

docs/USER-GUIDE.md

@@ -103,7 +103,9 @@ The launcher window stays open in the background. Closing it stops the server
 
 - Windows 10/11 (64-bit), macOS 11+, modern Linux (2020+).
 - Modern browser (Chrome, Edge, Firefox, Safari, last 3 years).
-- ~400 MB free disk space (the bundle itself is ~200 MB; the rest is working scratch space for large CSVs).
+- ~500 MB free disk space (the bundle itself is ~300 MB; the rest is working scratch space for large CSVs).
+
+**OCR for scanned PDFs is bundled** — Tesseract 5.5 + the English `eng.traineddata` model ship inside every installer / portable / AppImage. The PDF Extractor's scanned-statement path works out of the box; no separate install required. (Developers running from a `pip install -r requirements.txt` checkout still need system Tesseract on `PATH` — see [DEVELOPER.md §PDF Extractor — bundled Tesseract](DEVELOPER.md#pdf-extractor--bundled-tesseract).)
 
 Full numbered support matrix: [REQUIREMENTS.md](REQUIREMENTS.md).