Rewrite in place
Proofread, change the tone, or shorten a sentence. The result replaces your selection where you’re writing.
Built-in AI · private on your computer
Your AI runs here.
Your data stays here.
GhostPen runs the AI model directly on your computer. With built-in models, your text, images, and audio stay on your device. Select, rewrite, translate, and keep writing in any app.
✓ Works offline after download✓ No account needed
Free & open source · Linux, Windows & macOS
Your computer · built-in mode
GhostPen✧
New message
Hi Alex,
ive attached the proposal. let me know what you think and we can discuss it tommorow.Thanks,
Sam
GhostPen✧CtrlShiftA Your words stay on this device.
✓ Pasted back · stayed local
Rewriting on your computer…
Everything happens on your computerBUILT-IN MODE
Your selection
Local AI model
Back in your app
Your selection stays on this device.
Interactive walkthrough · sample text · click any step to explore
At home in your everyday apps
Email
Documents
Chat
Browser
Editor
Your computer does the work
Download the model.
Keep the data.
GhostPen can run its own AI model on your GPU or CPU. Once the model is downloaded, built-in editing works offline. Your selected text, clipboard images, and transcribed audio are processed on your machine.
- 01Download a modelOpen Settings → Built-in models and choose one.
- 02Use a Built-in profileThe model runs inside GhostPen, on your device.
- 03Keep writing, even offlineSelect text in any app. The result comes right back.
You can also choose an external AI provider. With an external profile, your requests go to that provider. Choose Built-in to keep processing on your machine.
Inside your computerBuilt-in AI modelYour GPU / CPU✎ Text stays here◎ Audio stays here▧ Images stay here✓ Processed locallyYour data stays on this device
Built-in AI modelYour GPU / CPUSelect · transform · keep writing
See GhostPen at work.
From rough drafts to live captions, these everyday moments can happen on your computer.
Translate in any app
Translate the selected text and keep your conversation going without switching windows.
Your own instructions
Add custom actions or tell GhostPen exactly what you want it to do.
Beyond the keyboard
Speak, listen, read aloud, and read images.
Speak. Polish. Copy.
Dictate, then polish the transcript using your built-in AI profile. The result is ready on your clipboard.
Follow every conversation
Live captions for meetings, videos, and podcasts, transcribed on your computer with Whisper. Meeting mode saves the recording with who said what, a proofread transcript, and a player that follows along.
Hear it read aloud
Select text, or a result, and GhostPen reads it in a natural voice that runs on your computer, in the language of the text.
Turn images into words
Copy an image, extract its text with a built-in vision model, then edit or translate it.
Built-in models
Your own AI, ready when you are.
Open Settings, download a model once, and run it inside GhostPen. No extra server or account is needed. Your built-in model can keep working offline.
Pick the right sizeChoose from Qwen and Gemma models, from 1.3 GB to 6 GB.
Download with confidencePause and resume downloads. Files are checked against published checksums.
Reuse what you haveGhostPen can find models already downloaded by LM Studio or GhostReel.
Runs on your GPU through Vulkan, CUDA, or Metal, and on your CPU when needed.
BUILT-IN MODELS
● LocalChoose your model
Examples from the model catalog
Q
Qwen3.5 2BQuick edits and proofreading
1.3 GBIn useG
Gemma 3 4BWriting and languages
2.5 GBAvailableQ
Qwen3.5 9BMore room for complex work
6 GBAvailableBuilt to feel at home
Small and native.
GhostPen is built with Oriel, Zig, and your system webview. The AI engines are part of the app.
Latest Linux Vulkan AppImage download.
Direct dependencies: Oriel and zigimg.
Desktop platforms: Linux, Windows, macOS.
Extra AI servers needed in Built-in mode.
For your desktop
Make room for your own AI.
Pick your platform and download the latest release directly. Free and open source.
Finding the latest version…Linux
01AppImage, .deb, or .rpm. Vulkan for most GPUs, CUDA for supported NVIDIA cards.
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Windows
02Installer for Windows 10 and 11. Built-in models run on the GPU with Vulkan, or on the CPU.
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macOS
03Disk image for Apple Silicon on macOS 13+. Built-in models run on the GPU with Metal.
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Files are hosted by the GhostPen project. Choose one above to start the download.