Lang Switcher — бесплатный переключатель раскладки клавиатуры: одно нажатие Pause/Break исправляет слово, набранное не в той раскладке. Windows 10 и 11.
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Keyboard layout switcher that fixes what you already typed: press Pause/Break and the word typed in the wrong layout is retyped in the right one, and the layout switches. Free and open source, Windows 10 and 11, tray program, interface in 66 languages.
Taken from the repository README
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Read the full README ↗По-русски — переключатель раскладки клавиатуры, который исправляет слово, набранное не в той раскладке.
Lang Switcher fixes text typed in the wrong keyboard layout. You meant to type hello, but the
Russian layout was on, so the screen shows руддщ. Press Pause/Break: the word becomes hello,
and the window switches to the English layout. Press it again and you get the original back,
exactly as you typed it. One key, no setup, nothing to learn.
A keyboard layout switcher for Windows 10 and 11 that fixes what is already typed instead of guessing
while you type: a small tray program, free and open source, licensed under MIT OR Apache-2.0, with
the interface in 66 languages.
Program page · Download · Keyboard layout converter · Questions and answers · No Pause/Break key on your laptop?
Status: version 1.4.4; the interface speaks 66 languages (see Languages). What changed in each version is in What's new below and on the Releases page.
Pause/Break retypes them in the other layout, erasing the wrong word first. A
second press goes back, character for character, because the program keeps the keys themselves
and never overwrites them with the result.Pause/Break, and the selection is converted. The
clipboard is put back exactly as it was afterwards, every format of it.Releases are on the Releases page of this repository and on the download page of the site. The installer speaks the language of your Windows.
If the browser or Windows warns you. The program is signed with the author's own certificate, not one from a certification authority, and a new release is still downloaded rarely, so you will see warnings — this is expected:
Every window, step by step: Edge · Chrome · Opera · Yandex Browser · Firefox. You can check the file against the SHA-256 on its release page.
What the installer does with a certificate. Your Windows does not trust the author's
certificate, so the installer creates one of its own on your computer, "Lang Switcher (local)": good
for code signing only, not a certification authority, for 30 years. It signs the program with it,
destroys the private key at once, and puts the public part into the computer's Trusted Root
Certification Authorities. Uninstalling the program removes that certificate. If you would rather
not have it, run LangSwitcher-setup.exe /NOLOCALCERT: you get a copy of the program without the
certificate, which works everywhere except in programs run as administrator.
Windows 10 or Windows 11, 64-bit. No runtime to install, no account, no internet needed to work.
The interface speaks 66 languages — 64 languages, Serbian and Uzbek in both of their scripts: English, Russian, Ukrainian, German, French, Spanish, Portuguese, Italian, Polish, Czech, Turkish, Greek, Hebrew, Arabic, Hindi, Bengali, Urdu, Punjabi, Marathi, Telugu, Tamil, Persian, Gujarati, Thai, Kannada, Odia, Malayalam, Uzbek (Latin and Cyrillic), Nepali, Assamese, Azerbaijani, Khmer, Kazakh, Serbian (Cyrillic and Latin), Uyghur, Bulgarian, Armenian, Lao, Belarusian, Tatar, Georgian, Macedonian, Vietnamese, Dutch, Romanian, Hungarian, Swedish, Albanian, Danish, Finnish, Croatian, Slovak, Norwegian Bokmål, Lithuanian, Slovenian, Bosnian, Latvian, Estonian, Welsh, Maltese, Icelandic, Luxembourgish, Māori and Norwegian Nynorsk; Hebrew, Arabic, Urdu, Persian and Uyghur read right to left. The language list of the settings puts the language of Windows, English, the languages of your keyboard layouts and Russian on top, and the rest by name.
Typing. The program converts between any two Windows keyboard layouts installed on your computer, except layouts with an IME (Chinese, Japanese, Korean), where a character is built from several keys in a candidate window. It was measured on the layouts of Windows 11 for 102 languages — 107 combinations of a language and a script (96, plus 11 smaller scripts): 16 Cyrillic, 45 Latin with letters of their own, 34 with a script of their own (Arabic, Hebrew, Greek, Armenian, Georgian, Thai, the Indian scripts and more) and Fula in ADLaM; then 11 smaller scripts (Cherokee, Javanese, Inuktitut in syllabics and in Latin letters, and others). Azerbaijani, Serbian, Mongolian, Central Atlas Tamazight and Inuktitut are each counted with two scripts.
The finer points:
AltGr, dead keys (two in a row as well: BÉPO ´, ´, o is
ő) and keys that print several characters at once (Arabic لا, Indian conjuncts) are
converted the way Windows itself types them.สวัสดี is 4 letters and 6 code points).
In Notepad of Windows 11 the backspace method goes by the selection, like auto: that field
loses or repeats characters of an insertion after Backspace, and it takes a typed Tamil
consonant with its pulli (க்) off sometimes with one press, sometimes with two. The first press
over a typed word selects it there by its position in the text, not by caret stops: one stop or
three on the Tamil conjunct க்ஷ, and no count is right for both.لا is one key, B, and also two, G and
H) and the word was not typed just now, the program picks the reading that is more probable in
the target language. It has letter statistics for English, French, Spanish and Russian, and since
1.2.0 for Arabic, Persian, Indonesian, Hindi, Tamil and Sinhala.Ctrl of Canadian Multilingual Standard (the only layout of Windows with
such a level, Japanese aside) converts into the same level of a layout that has it; a target
layout without it does not take such a word, and the program sounds a refusal instead.CapsLock, and a character the target layout does not
have is carried over as it is.Where the letter statistics come from: public-domain books of Project Gutenberg (English, French, Spanish, Russian) and the Leipzig Corpora Collection, Universität Leipzig, licensed CC BY (the six languages of 1.2.0; the Sinhala corpus is drawn from Wikipedia, CC BY-SA). Only tables of letter frequencies are in the program, not the texts.
Pause/Break by default. In the settings window you can set another key, alone or with Ctrl,
Alt and Shift (Ctrl+F12, Alt+Shift+K), or a double tap of Shift — two short taps in a
row. No Pause key? Try Fn+Pause, a combination such as Ctrl+F12, CapsLock or the double
Shift.
In the settings file %APPDATA%\Lang_Switcher\config.toml:
[hotkey]
key = "F12"
modifiers = ["Ctrl"] # any of "Ctrl", "Alt", "Shift"; [] for the key alone
trigger = "press" # press, or double_tap (with key = "Shift" only)
Your keystrokes are never written to disk — not to the log, not to the settings, not to temporary files.
Once a day Lang Switcher reads a short news file from the author's site; it sends nothing about your computer. When a new version comes out, the program downloads it from the same site by itself, checks the author's signature and installs it while the computer is idle. A short notice by the tray icon tells you when it has been updated.
A message to the author from the wizard goes to the site only when you press Send yourself — exactly the text you saw before sending; a way to contact you is optional.
How it works, in detail:
https://panda-pishet-kod.dev/langswitcher/news.toml — one GET request
with no parameters. If it does not come, the next try is not before tomorrow. Letters and news
from it can be turned off in the settings file ([letters] feed = false), and, after the first
letter of the feed but not earlier than 90 days after the first start, in the "From the author"
window as well.LangSwitcherUpdate.exe, a scheduled task "Lang Switcher Update" running as the system. It takes
the installer only from the /langswitcher/files/ folder of the same site; its size and SHA-256
must match the ones signed in the news file, and its version must be newer than yours. If the new
version does not start, the previous one comes back.POST request to
https://panda-pishet-kod.dev/langswitcher/feedback, sent only when you press Send or
Retry. It carries the text of the message as it stands in the window, the language of the
interface, the kind of message (a problem or a suggestion), the version of the program, your
contact if you typed one, and a random number of the request so that the site does not file a
repeat twice. The program waits for the answer no longer than 15 seconds. If the site does not
answer, the wizard offers to send the same text by email to [email protected]
or to save it to a file.There is no other network activity. The details are in section 9 of the specification (in Russian).
New in 1.4.4: if the bare grave key is assigned as the language switcher in Windows, as is common in
Thailand, the program treats it as a switcher: the word typed after it converts correctly, the text
around it stays intact, and a second press of the hotkey still brings the original back (it used to
count as a typed character); in Ukrainian, Arabic, Persian and Thai the name of the program and the
download button open the pages of the site in that language; the numeral in the Arabic line under the
news is corrected. Version 1.4.2: the interface quotes in the marks of its language (English, German, Czech, Polish,
Turkish, Portuguese); in Notepad of Windows 11 the backspace method goes by the selection, like
auto, and a typed word is selected by its position, so a Tamil word no longer takes the space
before it or leaves a piece of itself behind; the pair of the configuration file accepts the identifier of a variant of a language
(0x00020422), a layout that is not there is refused with a line in the journal, and the pair looks
at the first 64 layouts of the session; the emergency chord Ctrl+Alt+Shift+F12 no longer reaches
the window under it. Version 1.4.1: a letter the target layout builds from two dead keys in a row is built the way
Windows builds it (French BÉPO ´, ´, o is ő); a word typed on the level of the right Ctrl
of Canadian Multilingual Standard converts into the same level of a layout that has it; in Notepad
with Tamil 99 the replacement no longer lands after the word with nothing erased. Version 1.4.0
added 22 interface languages, 1.3.0 another 30; 1.2.0 brought the Send button of the "Write to
the author" wizard and the letter statistics of six more languages. Since 1.0.0 the program
updates itself.
The tray menu → "Write to the author…" opens a short wizard: it collects what is useful (only what you leave ticked), shows you the whole text, and sends it with Send. Or open an issue in Issues — in English or Russian.
cargo build --release
Before a release build:
cargo clippy -- -D warnings
cargo test
The tests are tied to the developer's machine (exactly two layouts, Russian and US) and are not
expected to pass unchanged elsewhere; this is a decision of the project, not a defect. The release
scripts, the installer and the signing are described in README.ru.md and in the
specification SPEC.md; like the other documents of the project, they are in Russian.
Copyright © 2026 Panda Koder
The source code is available under either of MIT or Apache-2.0, at your option:
LICENSE-MIT, LICENSE-APACHE. Contributions are accepted under
CLA.md; see CONTRIBUTING.md.