A method for preparing an electrochromic device, comprising: placing an edge protection material (805, 815; 905, 915) on a portion of an electrochromic film , wherein the electrochromic film comprises an upper side (801a; 901a) and a lower side (801b; 901b), wherein the upper side is offset in lateral direction with respect to the lower side, and wherein respective lateral edges of the upper side and the lower side are offset from one another in a lateral direction, such that a first lateral edge of the upper side is set back laterally with respect to the adjacent lateral edge of the lower side, and a second lateral edge of the lower side is set back laterally with respect to the adjacent lateral edge of the upper side; wherein placing the edge protection material (805, 815; 905, 915) on the portion of the electrochromic film comprises: covering, at the first lateral edge, a portion of the top of the upper side and a portion of the top of the lower side with the edge protection material; and covering, at the second lateral edge, a portion of a bottom side of the upper side and a portion of a bottom side of the lower side with the edge protection material; thereby covering the first lateral edge of the upper side and the second lateral edge of the lower side with edge protection material; surrounding the electrochromic film with first and second interlayers ; interposing the electrochromic film and the interlayers between a first and a second substrate; and pressing the first and second substrate toward each other and thereafter curing by heating the interlayers to fix the electrochromic film between the first and second substrate ; wherein, the edge protection material (805, 815; 905, 915) prevents chemicals in the interlayers from entering into the electrochromic film and is electrically conductive and configured to function as electrodes for the electrochromic film . placing an edge protection material (805, 815; 905, 915) on a portion of an electrochromic film , wherein the electrochromic film comprises an upper side (801a; 901a) and a lower side (801b; 901b), wherein the upper side is offset in lateral direction with respect to the lower side, and wherein respective lateral edges of the upper side and the lower side are offset from one another in a lateral direction, such that a first lateral edge of the upper side is set back laterally with respect to the adjacent lateral edge of the lower side, and a second lateral edge of the lower side is set back laterally with respect to the adjacent lateral edge of the upper side; wherein placing the edge protection material (805, 815; 905, 915) on the portion of the electrochromic film comprises: covering, at the first lateral edge, a portion of the top of the upper side and a portion of the top of the lower side with the edge protection material; and covering, at the second lateral edge, a portion of a bottom side of the upper side and a portion of a bottom side of the lower side with the edge protection material; thereby covering the first lateral edge of the upper side and the second lateral edge of the lower side with edge protection material; covering, at the first lateral edge, a portion of the top of the upper side and a portion of the top of the lower side with the edge protection material; and covering, at the second lateral edge, a portion of a bottom side of the upper side and a portion of a bottom side of the lower side with the edge protection material; thereby covering the first lateral edge of the upper side and the second lateral edge of the lower side with edge protection material; surrounding the electrochromic film with first and second interlayers ; interposing the electrochromic film and the interlayers between a first and a second substrate; and pressing the first and second substrate toward each other and thereafter curing by heating the interlayers to fix the electrochromic film between the first and second substrate ; <EOS>