Cach cat va xoay mot hinh anh
Soat lai lan cuoi 2026-04-27. Mo Crop & Rotate Image de chinh sua trong trinh duyet - tep nguon o lai tren thiet bi cua ban.
Cat dung cach
Cong cu cat hien thi hinh anh o do phan giai goc voi mot hinh chu nhat di chuyen duoc o tren. Keo cac goc hoac canh de xac dinh vung cat. Kich thuoc pixel cua viec cat xuat hien o duoi cung de ban co the khop chinh xac voi kich thuoc muc tieu (1200x630 cho hinh anh Open Graph, 1080x1080 cho bai dang vuong tren mang xa hoi, 4032x2268 cho hinh nen dien thoai 16:9).
Hai che do cat bao quat hau het cac truong hop su dung:
- Cat tu do. Bat ky hinh chu nhat nao. Dung khi ban dang khung mot chu the ma khong co ti le muc tieu.
- Cat khoa ti le. Ti le pho bien nhu 1:1, 4:3, 16:9, hoac mot R:C tuy chinh. Dung khi ban phai dat mot hinh dang cu the (kich thuoc avatar, banner, thumbnail video).
Xoay khong mat chat luong
Xoay mot JPEG 90, 180, hoac 270 do la khong mat neu trinh chinh sua ho tro thao tac dung. JPG luu tru du lieu hinh anh trong cac khoi 8x8 hoac 16x16; xoay vuong goc sap xep lai cac khoi do ma khong giai ma lai cac pixel, vi vay khong mat chat luong. Kich thuoc tep van giu nguyen. Nut Xoay cua cong cu cat dung thao tac nay mac dinh.
Xoay mot goc tuy y (37 do, 5 do) khong phai khong mat tren bat ky dinh dang nao. Cac pixel duoc resample, tep duoc ma hoa lai, va mot phan nho chat luong giam la khong tranh khoi. Luu ket qua; khong xoay lai tep da luu nhieu lan vi moi lan them mot phan nho mat mat.
Flag xoay EXIF - cai bay
iPhone va nhieu may anh hien dai luu tru anh o huong cam bien ngang bat ke ban cam may anh nhu the nao. The Orientation EXIF noi voi cac trinh xem "xoay cai nay 90 do khi hien thi". Cac pixel khong thay doi; xoay la metadata.
Hai van de dieu nay gay ra. Thu nhat, mot so trinh xem cu bo qua the EXIF va hien thi anh nam ngang. Thu hai, neu ban cat mot anh ma trinh xem dang ton trong viec xoay EXIF, toa do cat chay trong he toa do da xoay - cat "tren cung" co the co nghia la cat ben phai thuc su cua du lieu cam bien goc.
Cac cong cu cat hien dai (bao gom cai tren freetoolonline) xu ly viec xoay EXIF mot cach trong suot - nhung gi ban thay la nhung gi ban cat. Neu ban tung thay mot ket qua cat bi xoay khong mong doi, mot khong khop EXIF la thu pham thong thuong. Khac phuc: mo hinh anh trong mot trinh xem ton trong EXIF, xuat lai voi EXIF duoc nung, sau do cat.
Xong? Nen truoc khi gui
Mot anh da cat thuong van lon hon noi den can. Ket hop viec cat voi compress image cho nhan tin hoac tai len web, hoac resize image neu ban cung can co dan ve mot kich thuoc pixel muc tieu. Bo chinh sua hinh anh day du o hub cong cu hinh anh.
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