Floating window
Keeps clear of your controls.
Every line gathers into one draggable, resizable window that stays off joysticks and buttons. Lock it, and it ignores every touch.
Free and open source, no root needed
Read any screen
in your language.
Screen Translator is a free, open-source Android screen translator for games, manga and visual novels. Tap the floating ball to read text with OCR, translate it and show the result over the original — with offline models or AI on your own PC.
- Works offline
- Runs AI on your own PC
- Apache-licensed
Japanese → Chinese
How it works
One tap. Every part swappable.
Like cells in a living tissue, each stage works on its own. If one provider goes down, the rest keep going.
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Capture
MediaProjection, or Shizuku to skip the prompt each session.
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Read
Text recognition on the phone, on your PC, or in the cloud.
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Translate
LLMs, DeepL, NiuTrans, Google — or models that run offline.
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Show
On each text box, in a floating window, or blended into the art.
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Speak optional
Phone voices, your own voice server, or an online voice.
For people who run their own AI
Your PC does the heavy lifting.
Point the phone at OCR and translation models running on your own computer. Your hardware does the work over your home network — faster than a phone alone, and cheaper than paying a cloud service for every line.
Open, editable prompts
Rewrite the translation prompt for your game, genre or tone. Your edits are kept, never overwritten.
Any OpenAI- or Anthropic-compatible server
Ollama or your own model server: set a base URL and model name, and results stream in as they're generated.
OCR on your desktop
Send screenshots to Umi-OCR or LunaTranslator on your PC for sharper recognition.
Stays on your network
Plain HTTP is allowed only to machines on your home network; anything public must use HTTPS. DeepLX and your own voice server plug in the same way.
Your phone
Captures the screen and shows the translation
Your PC
Umi-OCR
LunaTranslator
Ollama
DeepLX
Voice server
OpenAI-compatible translator
ConnectedBase URLhttp://my-pc.local/v1/
Model[your-local-model]
Prompt template
Translate this game dialogue into natural, casual Chinese. Keep names from the glossary. Keep each line short enough to fit its speech bubble.
Cloud service
Billed for every request, and screenshots leave your home.
Your own PC
Hardware you already own — no per-request bills, nothing leaves your network.
Adapt to screen
Game & manga translation, on your screen.
Adapt to screen picks colors, background and text size for every region. On comics, the bubble detector erases the source text, repairs the background and fits the lettering to each bubble's shape.
Sandship, Chinese to English
Word lookup
Circle a word, get a pocket dictionary.
Pronunciation, part of speech, meanings and example sentences, each with read-aloud.
One-finger control
Long-press for everything else.
An arc menu blooms from the ball: loop, re-pick region, language and preset switches — in whatever order you like.
Triggers
Start it however your hands are busy.
- Tap the ball — whole screen or one word
- Auto — on a timer, or once all the text appears
- Volume keys — hold both, eyes on the game
- Select text in any app, then pick Screen Translator
- Quick Settings — start or stop from the shade
Japanese manga, vertical text included
Reads right-to-left columns, skips furigana and joins sentences split across bubbles.
Names stay consistent
Per-game glossaries and a translation library keep characters and terms the same.
Hear it read aloud
Source, translation or a selected passage, with pause and resume.
Styled your way
Themes, a color picker, outlines, shadows and your own fonts.
More ways to translate
Beyond the live screen.
Batch translation
Pick a stack of images, or share screenshots straight to the app. Tasks keep running after you leave, and you can save translated copies that keep the original layout and fonts.
Input translation
Write in your own language, tap the floating ball, and the text in the input field turns into the language of the game or chat — ready to send.
Extract text only
Select an area and pull out its text without translating it. Copy it anywhere, or have it read aloud.
Translate when stopped
Turn on auto-translate and the app waits for the screen to stop moving, then translates by itself — no more tapping the floating ball for every new line.
Engines
Bring your favorite engine. Or none at all.
Read
On your phone
ML KitPaddleOCRManga OCR
Your PC or the cloud
Umi-OCRLunaTranslatorPP-OCR OnlineBaiduTencentYoudao
Translate
On your phone
ML KitSakuraHy-MT
AI and online services
DeepSeekChatGPTClaudeZhipuOpenAI-compatibleDeepLDeepLXNiuTransGoogle
Speak
On your phone
System voices
Self-hosted or online
Your voice serverVolcengineMiniMaxMiMo
Off by default, and never slows recognition or translation.
Runs on your phone, works offlineYour server or an online service — some may charge
Your screen, your choice
Fully offline, fully self-hosted — or anything in between.
Screenshots can stay on the phone
On-device recognition, translation and voice work with no network at all.
Keys stay encrypted, never exported
API keys, prompts and presets live in encrypted local storage.
Secure outside your home network
Unencrypted connections are allowed only to servers on your own network.
Settings that move with you
Export presets, glossaries and fonts in one bundle — without the keys.
Quick start
Up and running in minutes.
Install
Get the APK from GitHub Releases. Needs Android 8.0 or later.
Set it up
The guide walks you through languages, use case and engine, one page at a time.
Go back to your game
The floating ball rests quietly at the edge of the screen.
Tap, read, listen
The translation appears over the original. Long-press for more.
Next screen, already readable.
Free and open source. No account, no ads, no root.