🖼️ Free Browser Tool

Image Format Converter

Convert and resize JPEG, PNG, WebP, AVIF, BMP, GIF images — instantly in your browser, no upload needed.

Output Format
Resize & Quality
Width (px)
Leave blank to keep original
Height (px)
Auto from width (aspect ratio kept)
Quality
Applies to JPEG, WebP, AVIF
🖼️
Drop images here or click to browse
JPEG · PNG · WebP · AVIF · BMP · GIF · TIFF · SVG → PNG
Guide

How to Convert & Resize Images

Four steps — instant results, nothing to install.

1

Choose Format

Pick your output format. WebP and AVIF give the smallest files. PNG is lossless. JPEG is universally compatible.

2

Set Size & Quality

Optionally enter a target width in pixels. Leave blank to keep the original size. Adjust quality for lossy formats.

3

Drop Images

Drag and drop one or more image files. JPEG, PNG, WebP, AVIF, BMP, GIF, TIFF, and SVG are all accepted as input.

4

Download

Click Convert All. Each image is processed instantly in your browser and downloads automatically. Batch jobs run in parallel.

Features

About This Tool

A private, instant image converter using native browser Canvas APIs.

🔒

100% Private

✓ No upload
Your images are never uploaded anywhere. All conversion and resizing happens using the browser's built-in Canvas API — no WebAssembly, no server, no network requests for your files.
⚡

Instant Processing

✓ No download needed
Unlike audio/video tools, image conversion uses native browser APIs. There's no FFmpeg to download — conversion starts the moment you click Convert. A 10-image batch finishes in under a second.
📐

Smart Resizing

✓ Aspect ratio preserved
Set a target width and the height is calculated automatically to preserve the original aspect ratio. Or set both dimensions for an exact crop-free resize. Great for batch-resizing images to a specific width like 1200px for web use.
📦

Batch Conversion

✓ Parallel processing
Drop an entire folder of images. All files are processed in parallel and download automatically. The queue shows a thumbnail, original size, output size, and compression ratio for every file.
🌐

Modern Formats

✓ WebP · AVIF · PNG · JPEG · BMP
WebP delivers 25–35% smaller files than JPEG at equivalent quality. AVIF goes even further — 50% smaller than JPEG — and is now supported in all major browsers. Convert your entire image library to modern formats in one batch.
FAQ

Frequently Asked Questions

Common questions about image conversion.

WebP is the best default for web — excellent quality, ~30% smaller than JPEG, supported in all modern browsers. Use AVIF for even smaller files if your audience is on Chrome or Firefox. Use PNG for logos, icons, or any image with transparency that must be lossless. Use JPEG for maximum compatibility with older systems.

Common web widths: 1200px for full-width blog images, 800px for article body images, 400px for thumbnails, 1920px for hero/banner images. For retina displays, use 2× the display size (e.g. 2400px for a 1200px display slot) and let the browser scale it down.

Yes. JPEG and BMP don't support transparency. Transparent areas are filled with white when converting to these formats. Use WebP or PNG if you need to preserve transparency. AVIF supports transparency but browser encoding support varies.

GIF is supported as input — the first frame is extracted and converted. SVG is supported as input via the browser's built-in SVG renderer, giving you a rasterized PNG/WebP/JPEG at your chosen resolution. Animated GIFs are not supported for output.

No. This tool uses the browser's Canvas API — conversion happens entirely on your device. Your images are never transmitted anywhere. You can disconnect from the internet after loading the page and the tool will still work perfectly.