
Official inline bot: type @wiki and a query in any chat to insert a Wikipedia article card without leaving the conversation. Free, works in every chat, no setup.
Bots you never have to open — type @username and your query directly in any chat's message box, and a ready-to-send result appears instantly.
Inline mode is Telegram's least obvious feature and one of its best: type @ followed by a bot's username and your query right in the message box of any chat, private or group, and a list of results appears above the keyboard — pick one and it sends as if you'd typed it yourself. Nobody else in that chat needs to have the bot installed, and you never open a separate conversation with it.
This list covers the best inline bots for search (Wikipedia, images, GIFs), quick tools (currency conversion, a calculator, text formatting) and creative extras (emoji mashups, channel post building) — all usable from wherever you already are.

Official inline bot: type @wiki and a query in any chat to insert a Wikipedia article card without leaving the conversation. Free, works in every chat, no setup.
Drops a Wikipedia summary card into any conversation just by typing @wiki and a search term.

Official inline image search: type @pic and a phrase in any chat and pick a picture from Yandex results to send instantly. Free, no app switching, 4.5 million monthly users.
Searches Yandex images and sends a picture without leaving the chat — type @pic and a phrase.

Official inline GIF search: type @gif and a mood or phrase in any chat and send an animation in one tap. Free, no app switching, 130 thousand monthly users.
Finds and sends a GIF that matches your mood in one tap, right from the message box.

Official inline bot: type @vid and a phrase to insert a YouTube video with preview into any chat. Free, no downloads, 236 thousand monthly users.
Inserts a YouTube video with a preview into a chat by typing @vid and what you're looking for.

Official inline formatter: type @bold and your text in any chat to send it as bold, italic or monospace without markdown syntax. Free, instant, works everywhere.
Turns plain text into bold, italic or monospace on the fly, with no Markdown syntax to remember.

Telegram's official poll maker: create a question with options, get a shareable poll message with live results for any chat, including channels. Free, no setup, 224 thousand monthly users.
Builds a poll with live results inline, so you never have to leave the chat to set one up.

Telegram's official quiz builder: create multiple-choice quizzes with timers, explanations and media, share by link or inline, and see leaderboards. Free; 1.3 million monthly users.
Also works inline — share a ready-made quiz into any chat by typing @QuizBot without opening the bot first.

Official inline IMDb search: type @imdb and a title in any chat to send a card with poster, year, rating and link. Free, instant way to settle "what was that film" debates.
Type @imdb and a film title to send a poster, rating and year card without opening a browser.

Official Yandex Translate bot: send text and get a translation with automatic language detection, or use it inline in any chat. Free, dozens of languages, strong on Russian.
Translates a phrase inline with Yandex Translate by typing @YTranslateBot before you send a message.

An inline bot that mashes two emoji together into a single custom sticker-style image — type it right inside any chat's message box, no need to open the bot itself.
Mashes two emoji into one sticker-style image right in the message box, no separate app.

A hugely popular post-building tool for channel owners and marketers: design a message with templates, inline buttons and premium emoji, then send it to any chat or channel with one click. Free, over 3.5 million monthly users.
Builds a formatted post with buttons inline, then sends it to any chat or channel in one click — 3.5 million monthly users.

Currency converter in a chat: send "100 usd to eur" or a pair and get the current rate, with inline mode for quick answers in any conversation. Free, English.
Converts a currency pair inline — type an amount like "100 usd to eur" and send the answer as a card.

An inline calculator — type @mathcalcbot and an expression like sin(60)*sqrt(16)/.3 in any chat, and a ready-to-send result pops up without ever opening the bot itself.
An inline calculator — type an expression like sin(60)*sqrt(16)/.3 and send the result without opening the bot.