What is an Aspect Frame Generator?

An aspect frame generator is a tool that creates matte-style frame overlays: the black bars you see in cinematic videos that create a letterbox or pillarbox effect. These frames are used in video production, photography, social media content creation, and UI mockups to simulate different screen formats or add a cinematic look to footage.

CodeHelper's Aspect Frame Generator lets you choose from common cinema aspect ratios, set a custom resolution, and download a transparent PNG overlay ready to use in your video editor or image editor.

Common Use Cases

Letterboxing: Add black bars top and bottom to simulate a 2.39:1 or 21:9 cinematic frame on 16:9 footage.
Pillarboxing: Add bars to the sides to center 4:3 or 1:1 content on a wider display.
Social Media Frames: Create consistent frame overlays for Instagram, TikTok, or YouTube content.
UI Mockups: Use matte frames to present app screenshots in a specific device aspect ratio.

How to generate a matte frame

Select the target aspect ratio for the frame (e.g., 2.39:1 for anamorphic cinema).
Enter the resolution of your source media (e.g., 1920×1080).
Preview the frame overlay on the canvas.
Download the PNG with a transparent center to overlay on your media.

Whether you are a videographer adding cinematic bars, a photographer creating consistent Instagram crops, or a designer building UI mockups, this free aspect frame generator delivers precise results instantly.

Aspect Frame Generator