Are my resolution calculations transmitted anywhere?

No! All aspect ratio formulas run 100% locally in your browser memory.

Image & Media Tools

Video Aspect Ratio Calculator

Calculate video aspect ratios (16:9, 4:3, 9:16, 1:1).

Media Studio (PDF, Audio, Video & GIF)

Client-Side PDF Toolkit

Click to upload PDF or Images for processing

100% Client-Side PDF processing. No server uploads.

About Video Aspect Ratio Calculator

The Video Aspect Ratio & Dimension Scaler calculates proportional video width and height scaling across standard video aspect ratios (16:9 Landscape, 9:16 Vertical Shorts/Reels, 4:3 SD, 1:1 Square, 21:9 Ultrawide, 2.39:1 Anamorphic Cinemascope).

Step-by-Step Guide

How to Use Video Aspect Ratio Calculator

Step 1

Enter an initial width or height in pixels.

Step 2

Select target aspect ratio from the preset dropdown or enter a custom ratio ($X:Y$).

Step 3

Review computed proportional dimensions and macroblock alignment status.

Step 4

Click "Copy Dimensions".

Industry Scenarios

Practical Use Cases for Video Aspect Ratio Calculator

Rescaling Video Resolutions for Vertical Social Media (9:16 Reels / TikTok)

Calculate exact target pixel dimensions when adapting a 4K 16:9 landscape master (3840x2160) into 1080x1920 or 2160x3840 vertical video formats.

Calculating Anamorphic Letterbox & Pillarbox Padding

Compute precise letterbox bar pixel padding when embedding 2.39:1 Cinemascope widescreen footage into standard 16:9 video containers.

Sample Data & Transformation

Input & Output Examples

Calculating 16:9 Downscale Dimensions from Custom Width

Input Sample:

Source Width: `1440px`, Target Aspect Ratio: `16:9`

Processed Result:

Target Dimensions: `1440 x 810 px` | Exact Ratio: `1.7778:1` | Total Megapixels: `1.17 MP`

Technical Capabilities

Key Features & Performance

✓Standard Ratio Presets: 16:9 (HDTV), 9:16 (TikTok/Reels/Shorts), 4:3 (SD/IMAX), 1:1 (Square), 21:9 (Ultrawide), 2.39:1 (Cinemascope), 4:5 (Instagram Feed).
✓Dual-Axis Locking: lock either Width or Height to calculate the corresponding proportional dimension.
✓Macroblock alignment check: verifies dimensions are divisible by 2, 8, and 16 to prevent video encoder crashes.
✓100% Client-Side memory execution.
✓1-Click Copy dimension pairs.

Technical Glossary

Key Terminology & Definitions

Macroblock Alignment (Mod-2 / Mod-16)

Video compression algorithms partition video frames into $16\times16$ or $8\times8$ pixel macroblocks; dimensions not divisible by 2 or 16 can cause green line encoding glitches.