Image Viewer Guide

What does this tool do

The Image Viewer displays, zooms, rotates, and edits image files from your device. View a single image or a multi-image gallery with thumbnail navigation. Zoom in/out, rotate, flip horizontally or vertically. Adjust brightness, contrast, and grayscale. Download the edited image. Supports JPEG, PNG, GIF, WebP, and SVG. No upload—all processing runs in the browser.

How to use it

1. Load images — Select one or more image files, or drag and drop.
2. Navigate — Use thumbnails or arrows to switch between images in a gallery.
3. Zoom — Use zoom controls or scroll to zoom in and out.
4. Rotate & flip — Rotate 90° or flip horizontally/vertically.
5. Adjust — Change brightness, contrast, and grayscale with sliders.
6. Download — Save the current image (with edits applied) as PNG.

How it works

Images are decoded by the browser's native image decoding. They are drawn to a canvas for non-destructive edits (brightness, contrast, grayscale). Transformations (rotate, flip) are applied via canvas or CSS. The gallery maintains a session limit (e.g. 200 images) to prevent memory exhaustion. Fit-to-screen is the default view mode. SVG may render differently depending on browser support.

All computation runs entirely in your browser. No data is sent to any server.

Use cases & examples

• Photo review — Quick view of photos before uploading.
• Screenshots — View and annotate screenshots.
• Design assets — Inspect and adjust images.
• Batch preview — Scroll through a folder of images.
• Simple edits — Brightness/contrast adjustments.

Example

• Load photo.jpg → Full image, zoom to 100%.
• Apply grayscale → Image displayed in grayscale.
• Rotate 90° → Image rotated; download saves the rotated version.

Limitations & known constraints

• 200-image cap — Session limit to prevent memory issues; most users load fewer.
• Browser decoding — Format support depends on browser (JPEG, PNG, GIF, WebP, SVG).
• Canvas edits — Brightness/contrast applied on export; may lose some precision.
• SVG — Complex SVGs may render differently across browsers.