Bytes is the default measurement use k for kilobytes and m for megabytes.
For example, after:5 finds all messages sent or received on or after May 5, 2019. after: finds messages sent on or after a date, which is typed as YYYY/MM/DD.For example, in:drafts finds all messages in your Drafts folder. Anywhere includes the Spam and Trash folders. in: searches in the folder you specify, such as Drafts, Inbox, Chats, Sent, Spam, and Trash.For example, filename.doc finds all messages with. You can include file name extensions to restrict your search to certain file types. filename: searches within file names of attachments.has:attachment searches for messages that have files attached to them.is:unread, is:read, and is:important find messages marked as such for Priority Inbox.For example, has:yellow-star returns messages with a yellow star, has:yellow-bang finds messages with a yellow exclamation mark, has:purple-question searches for messages with a purple question mark, has:orange-guillemet finds messages with two orange forward arrows, and has:blue-info returns messages with a blue i. You can specify the color of a star or other mark using has. is:starred searches for starred messages.
has:nouserlabels searches for messages that have no labels except those that Gmail uses by default.has:userlabels searches for emails that have any labels except those used by default (those that don't include labels such as inbox, trash, and spam but including smart labels).For example, label:toodoo-doll finds all messages labeled toodoo doll. When using this, replace whitespace characters in label names with hyphens. label: searches for messages assigned a label.For example, bcc:heinz finds all messages that you sent with in the Bcc field. bcc: searches for addresses and names in the Bcc field.For example, finds all messages that were sent to as a carbon copy. For example, finds all messages sent directly (not via Cc or Bcc) to cc: searches for recipients in the Cc field. to: searches the To line for names and addresses.For example, from:heinz finds all messages from along with those from For example, from:me finds all messages you sent using any Gmail address you set up. from: searches for sender name and email address.For example, subject:bahamas finds all messages with bahamas in the subject line.