Aspect Ratio Converter

Convert image aspect ratios (1:1, 16:9, 9:16, etc.) in bulk. Crop, add margins (padding), or fit images instantly for YouTube, Instagram, X (Twitter), TikTok, and more. 100% browser-side, secure, and free.

Your images are processed locally and never sent to our server.
Drag & drop images here or click to select
Supported formats: PNG, JPG, JPEG, WebP, GIF, BMP (Multiple files allowed)

FAQ

What is an aspect ratio?

An aspect ratio is the proportional relationship between an image's width and height, represented as two numbers separated by a colon (e.g., 16:9). Changing it helps images fit correctly on different screens and social media formats without stretching.

What is 16:9 aspect ratio?

16:9 is the universal standard format for high-definition widescreen displays, televisions, and internet video. For example, a 1920x1080 resolution is exactly a 16:9 aspect ratio. It is the recommended ratio for YouTube video thumbnails.

What are the recommended sizes for social media?

Social media networks recommend specific dimensions: YouTube Thumbnails: 1280x720 (16:9); Instagram Square: 1080x1080 (1:1), Portrait: 1080x1350 (4:5), Stories: 1080x1920 (9:16); X (Twitter) Posts: 1600x900 (16:9) or 1200x675; TikTok: 1080x1920 (9:16). Our presets apply these instantly.

What is the difference between Crop, Pad, and Auto Fit?

• "Trim/Crop" scales the image to fully cover the target ratio, trimming overlapping outer areas. • "Add Margins" scales the image to fit entirely within the ratio and fills the remaining space with a chosen background color. • "Auto Fit" scales the image content to fit the target ratio without clipping, adjusting the background width or height accordingly.

Can I use this converter on my mobile phone?

Yes, this tool is fully responsive and optimized for mobile devices. You can import files directly from your smartphone camera roll, adjust cropping with intuitive touch-dragging gestures, and save the converted files instantly.

Are my uploaded images safe?

Absolutely. All image processing (resizing, padding, and cropping) is done entirely on your device using HTML5 Canvas client-side APIs. Your photos are never uploaded or stored on any server, guaranteeing maximum privacy and speed.

About Aspect Ratio Converter

This utility is a high-performance, developer-focused batch aspect ratio converter. It allows you to align multiple images to uniform aspect ratios and specific social media dimensions. Choose between smart cropping (with interactive drag-position adjustments), margin padding, or clean fitting, all processed securely within your web browser.