How to copy a whole line of text on iPhone
iOS has no gesture for selecting a full line in one move — you double-tap a word, then drag two small handles that snap word by word, not line by line. A Copy line button in a keyboard’s own toolbar skips the selecting step entirely, and here is exactly what it does instead.
An address, a tracking number, one line of a poem someone sent you — you want to copy exactly that line and nothing else, and the way iOS makes you do it is double-tap a word to start a selection, then drag two small round handles out to the edges of the line by hand. It works, but it is a worse fight than it should be, especially the moment the line wraps onto a second row or sits right at the edge of what is visible on screen. There is no dedicated gesture for “select this line” anywhere in stock iOS, which is exactly the gap a Copy line button on a keyboard’s own toolbar is built to close.
What iOS actually gives you to select text with
Double-tapping a word selects it and shows two blue handles, one at each end, along with a small menu offering Cut, Copy, Paste and Look Up. From there, dragging either handle extends or shrinks the selection — and it snaps word by word as you drag, not letter by letter, which is fast for grabbing a sentence but useless for stopping precisely at the end of one specific line. A long press elsewhere in the text pops up a magnifying loupe for placing the cursor instead of selecting anything. That is the whole toolkit. Nothing in it is built around the idea of a line as its own unit — a desktop trackpad’s triple-click-for-a-line has no iOS equivalent.
Why one line is the fiddly case, not the easy one
A single word is the easy case — double-tap and you are done. A large block is also fairly forgiving, because overshooting the start or end by a word barely matters against the size of the whole selection. A single line sits awkwardly between the two: you need an exact start and an exact end and nothing past them, on a target that can be a single row of a paragraph that wraps across three. Drag a handle a hair too far and it jumps onto the line above or below, because as far as the selection is concerned that wrapped paragraph is one continuous run of text, not three separate lines stacked on the screen. That is the specific situation the native handles handle worst.
What a Copy line button does instead
A keyboard extension is handed a live connection to whatever text field you are typing in, including the text sitting immediately before and after the cursor — that is how autocorrect and next-word prediction already read your sentence as you type it. A Copy line button uses the same connection differently: instead of drawing a selection on screen at all, it walks outward from wherever the cursor currently sits, backward until it hits a line break or the very start of the text, and forward until the next line break or the end, and treats everything in between as “the line.” One tap copies exactly that span to the system clipboard. No handles, no dragging, no risk of grabbing half of the line above by mistake.
It copies the logical line, not the row your eyes see
One nuance worth knowing before you rely on it: “line” here means the line as text, bounded by an actual line break, not whichever row your narrow screen happened to wrap it onto. If one long sentence wraps across three visible rows, a Copy line button copies the whole sentence, not just the single row the cursor happens to be sitting in. In practice that is usually the more useful behaviour — most people reaching for “copy this line” mean the sentence or list item, not wherever the phone’s screen width happened to break it — but it is worth knowing the button is reading the text, not the screen.
Why this needs Full Access, and what Copy word adds
Writing to the system clipboard from inside a keyboard extension is exactly the thing iOS keeps sandboxed by default, for the same reason covered in a separate guide on this site about Full Access: a keyboard sitting between you and every text field you type in is a genuinely sensitive place to hand clipboard access to without asking. A Copy line button, like a Paste button, only works once Full Access is turned on for that keyboard in Settings → General → Keyboard → Keyboards. A Copy word button is the same idea at a smaller scale — one tap grabs just the word nearest the cursor, which is the faster fix when only one word in a sentence is wrong and a full line is more than you need.
Where Kibo fits
Kibo’s toolbar carries Copy word, Copy line and Paste buttons built on exactly this mechanism, and they are the only place in the app that touches the system clipboard at all. Full Access is off by default, and everything else — typing, every theme, every key sound, every backlight effect, emoji, kaomoji, fancy text and all 30 typing languages — works the same with it left off. Turn it on in Settings → General → Keyboard → Keyboards → Kibo and those three buttons switch from showing a short message to actually reading and writing the clipboard; leave it off and the rest of the keyboard is unaffected either way. It is free to download.
Frequently asked questions
Is there a one-gesture way to select a whole line of text on iPhone?
Not in stock iOS. Native selection is double-tap-a-word followed by dragging handles that snap word by word, with no dedicated “select this line” gesture. A Copy line button on a keyboard’s own toolbar is the one-tap alternative some keyboards build to cover exactly that gap.
Does Copy line copy the visible row or the whole sentence?
The whole logical line — everything between the nearest line breaks before and after the cursor — not just whichever row a narrow screen happened to wrap it onto. A sentence spanning three visible rows still copies as one line.
Does a Copy line button need Full Access?
Yes. Writing to the system clipboard from inside a keyboard extension is exactly what Full Access gates, the same as a Paste button. Turn it on in Settings → General → Keyboard → Keyboards → the keyboard in question.
Try it on your own keyboard
Kibo is a free custom keyboard for iPhone with real mechanical key sounds, a wardrobe of themes and RGB backlight effects. No account, no ads, and it works with Full Access left off.