Aspect Frame Generator

Generate matte frames with custom aspect ratios and download them as images.

Aspect Frame Generator

Current Ratio1.778:1
Frame TypeLetterbox
Transparent Area1920×817px
Bar Height131px

Preview

codehelper-matte-1920x1080-ratio-2_35.png
Generating preview...

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

  1. Select the target aspect ratio for the frame (e.g., 2.39:1 for anamorphic cinema).
  2. Enter the resolution of your source media (e.g., 1920×1080).
  3. Preview the frame overlay on the canvas.
  4. 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.

Frequently Asked Questions

What aspect ratio should I use for social media?

Use 1:1 for feed posts, 4:5 for portrait feed posts, 9:16 for Stories, Reels, Shorts and TikTok, and 16:9 for YouTube and landscape video. This tool adds clean frame bars to fit your image or video to any of these ratios without stretching the content.

How do I add cinematic black bars to a video or photo?

Cinematic letterboxing is done by framing your content to a wide ratio such as 2.39:1 or 21:9 and adding bars above and below. Choose the target ratio here and the generator produces the framed result, which is a quick way to give footage or stills a filmic look.

What is the difference between cropping and letterboxing?

Cropping cuts away part of the image to reach the target ratio, losing content at the edges; letterboxing (adding bars) keeps the whole image and fills the remaining space with a solid color. Use cropping when the edges are unimportant and letterboxing when you must preserve the entire frame.

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