File & Document Conversions

Image Resizer

Fast, private, and professional online image resizer. Resize JPG, PNG, WEBP, and AVIF photos by pixels, percentage, or social media presets with 100% browser-based processing.

How to Use Image Resizer

Our Image Resizer is engineered for instant, zero-latency execution directly inside your browser. All computations, file formatting, and dataset transformations take place locally with maximum security and data privacy.

Launch the tool above on your computer, tablet, or smartphone.
Provide input values or drag and drop files into the designated dropzone.
Customize options, metrics, output presets, or quality settings.
Copy results directly to your clipboard or export downloadable files in one click.

Frequently Asked Questions (FAQ)

How do I resize an image without losing quality?

Select 'Resize by Pixels' or choose a high-resolution preset, maintain the original aspect ratio, and select PNG or high-quality WEBP output format. Our high-precision HTML5 canvas bilinear scaling engine minimizes pixelation.

Are my images stored or uploaded to your servers?

No, absolutely not. All image loading, canvas scaling, format encoding, and ZIP batch compression run 100% locally inside your browser memory using Web APIs. Your images never leave your computer.

What image formats are supported for input and output?

Input formats include JPG, JPEG, PNG, WEBP, GIF, BMP, TIFF, and AVIF. You can output resized images as JPG, PNG, or WEBP with custom quality controls.

Can I resize multiple images at once in batch?

Yes! You can drag and drop multiple images at once, apply unified pixel dimensions or social media presets across all photos, and download them individually or as a single compressed ZIP file.

How does the aspect ratio lock work?

When aspect ratio lock is enabled (the chain lock icon), changing either width or height automatically recalculates the other dimension proportionally, preventing stretching or distortion.

What social media presets are available?

We provide built-in dimensions for Instagram Posts & Stories, YouTube Thumbnails & Banners, Facebook Covers & Posts, TikTok, Pinterest Pins, LinkedIn, Twitter/X Headers, WhatsApp, and 4K/Full HD display resolutions.

Can I convert transparent PNGs to JPG with custom backgrounds?

Yes! When converting transparent PNG or WEBP files to JPG, you can specify a custom background color (e.g. white, black, or custom hex) to fill transparent regions seamlessly.

Is this image resizer completely free?

Yes, SmartTools24.net Image Resizer is 100% free with zero watermarks, no sign-ups, and unlimited batch image resizing.