WhatsApp will not let you send an empty message, and it will not let you send a message made only of spaces either. The send button stays greyed out because WhatsApp trims whitespace from both ends of your input and then checks whether anything remains. An invisible Unicode character solves this, because it looks like nothing but does not count as whitespace.
Which invisible character works
The most reliable choices are the Braille Pattern Blank (U+2800) and the Hangul Filler (U+3164). Both render as empty space, but Unicode classifies them as letters, not as spaces, so WhatsApp’s trim check leaves them alone and the message sends. The Braille Blank is the most widely compatible across apps, while the Hangul Filler is also popular for game usernames. Zero-width characters such as U+200B sometimes work, but WhatsApp strips them in some versions, so they are a poor first choice for this job. Ordinary spaces, tabs, and line breaks will not work, no matter how many you type.
Steps to send a blank message
First, copy one invisible character from a generator or a character reference. Your clipboard will look empty, and that is expected: the character is there, you just cannot see it. Second, open WhatsApp and go to the chat where you want to send the message. Third, long-press the message box and choose Paste. The send button should become active even though the field still looks empty. Fourth, tap send. The recipient sees an empty message bubble with a timestamp and nothing inside it. On most devices the bubble looks slightly smaller than a normal text bubble.
What the recipient sees, and what can go wrong
Most recipients see a clean empty bubble. On very old devices, a tiny dot or box may appear instead of a blank, because the device lacks that character in its fonts. If that happens, try the other character: switch from Braille Blank to Hangul Filler or back again. Sending many blank lines in a row also works as a spacing trick in group chats, but use it sparingly; a wall of empty bubbles annoys people fast and can look like spam to moderators.
Other uses for invisible text
The same characters create blank display names and statuses in some apps, and blank lines in bios. Each app has its own rules, though: some strip invisible characters from usernames, some reset blank display names during cleanups, and some, like Instagram, still require at least one visible character in a username. Test one character in the exact field you care about before you rely on it, because a trick that works in WhatsApp messages may fail in a profile name.
A note on manners
Blank messages are fun for a prank or a pause in a conversation, but they carry no information, so the recipient cannot tell whether you meant anything by them. Keep them to friends who will get the joke, avoid them in work chats and customer conversations, and never use invisible characters to hide text meant to deceive someone, such as disguising a link or a name. Used lightly, it is a harmless trick; used to mislead, it is a different matter entirely.
Blank names, bios, and spacing tricks
Beyond WhatsApp messages, invisible characters have a few other playful uses, each with its own limits. Some games and apps accept an invisible character as a display name, producing a blank name in a player list, though many platforms now block this or reset blank names during cleanups, so a blank name may not last. In bios and status lines, a line of invisible characters can create visual spacing between sections, pushing text apart in a way normal line breaks sometimes do not. The same technique can separate blocks in a long group message, giving readers a visual pause. Test each use in the exact app and field you care about, because behaviour varies widely: a character that sends fine in WhatsApp may be stripped from a username field, and a blank status that works today may be reset by the app tomorrow. Keep a copy of the character saved in your notes so you can reapply it quickly if it is removed.
Try it free right here
Use the free Invisible Text Generator — Copy & Paste Blank Characters (ㅤ) below, right on this page. It runs in your browser and needs no sign-up. You can also open the full tool here: Invisible Text Generator — Copy & Paste Blank Characters (ㅤ).