Multi-FileOptional Resize100% Private

How It Works

1

Upload Images

Drop up to 10 images in any supported format.

2

Choose Output

Select target format, quality, and optional resize.

3

Download

Download each converted file individually.

Frequently Asked Questions

Which image formats are supported?
This tool accepts JPG, PNG, WebP, AVIF, BMP, and GIF as input. You can convert to JPG, PNG, WebP, or BMP output format.
Can I convert multiple images at once?
Yes, you can upload up to 10 images and convert them all at once with the same settings. Each file is processed individually in your browser.
Does the quality slider affect PNG output?
No. PNG is a lossless format, so the quality slider only affects JPG and WebP output. PNG files will always preserve full quality.
Can I resize images during conversion?
Yes. Enable the resize option and specify width, height, or both. If you only specify one dimension, the other is calculated automatically to preserve the aspect ratio.
Are my images uploaded anywhere?
No. All conversion happens in your browser using the Canvas API. Your images stay on your device at all times.
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About Format Converter

What this tool does

This tool converts images between popular file formats such as PNG, JPG, WebP, AVIF, and BMP. The conversion runs entirely inside your browser using the Canvas API, so no file ever leaves your device. You can convert single files or batch-process multiple images at once, and the output respects the original resolution and color space.

Why use this tool

Different platforms and applications require specific image formats. Social media, email clients, and web frameworks each favor their own format for size, quality, or transparency support. Instead of installing desktop software or uploading files to a remote server, you can switch formats instantly while keeping your images private.

How it works

The browser decodes your source image into a raw pixel bitmap, then re-encodes it in the target format using built-in codecs. For lossy formats like JPEG, you can adjust the quality slider to balance file size against visual fidelity. For lossless formats like PNG, the full pixel data is preserved.

Pro tip

Need the smallest file size for web use? Convert to WebP at 80% quality. Most modern browsers support it, and you can cut file sizes by 25-35% compared with JPEG at the same visual quality.

Deep Dive: Related Research

Image Compression Benchmark 2026: 10 Formats Tested Across 1,000 Images

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The Complete Guide to File Formats: Every Format Explained, Compared & Benchmarked (2026)

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Web Performance Format Guide 2026: Images, Fonts, Scripts, and Core Web Vitals

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