Read a PDF and its translation side by side
Open a document, choose a translation path, review each page, and export a side-by-side PDF.
See the stepsmacOS · Direct download and App Store
GrayCat PDF
Read original and translated pages side by side, with OCR, annotations, signatures, merging, compression, and export in the same app.
Direct version 1.0.1 requires macOS 14.0 or later and supports Apple silicon and Intel Macs. It is signed with Developer ID and notarized by Apple. To update the direct edition, download the latest version from this page. Current App Store version: 1.0.1. Download and update on the App Store; availability varies by storefront.
SHA-256 · GrayCat PDF privacy · GrayCat PDF support
Inside the app · 6 screenshots
Bilingual reading, document tools, and batch processing
These screenshots show bilingual reading, OCR and document tools, batch processing, merging, and privacy controls.
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Original and translation, side by side
Task guides
Start with what you need to do
Create a searchable copy of a scanned PDF
Run local OCR and understand what changes when the app redraws each page.
See the stepsTranslation, annotation, and PDF tools
Page-by-page translation
Read the original and translation side by side. Edit results paragraph by paragraph, save automatically, and resume later.
Instant translation
Select text while reading to see a translation and term explanation informed by the current page context.
Two translation paths
Use Apple on-device translation on macOS 15 or later, or connect a supported AI provider, an OpenAI-compatible endpoint, or Ollama running locally.
Reading and page organization
Continuous, single-page, and two-page modes with outline, full-text search, page jumps, thumbnail reordering, and dark mode.
OCR, annotations, and signatures
Make scanned documents searchable, then add highlights, underlines, strikethrough, notes, and handwritten signatures.
Merge, compress, and export
Combine and reorder files, extract pages, create a smaller copy, manage passwords and document properties, and export images, Word, or plain text.
Local document work and optional translation services
PDF files, annotations, signatures, form content, OCR, and other document processing stay on your Mac. GrayCat requires no account and includes no advertising, analytics, or tracking SDKs.
Apple system translation processes text on device. Only after you choose AI translation and confirm the request does the selected text, or the text of the pages you translate, plus page context go directly to your chosen provider or endpoint. The developer runs no relay server and cannot access that content.
API keys stay in this Mac's system Keychain. Read the GrayCat PDF privacy policy for the complete scope, or visit support for common questions.