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Image Format Converter

Convert images between PNG, JPEG, and WebP formats instantly in your browser.

About this tool

Image format conversion is essential for web developers, designers, and content creators who need to optimize images for different platforms and use cases. PNG works best for graphics and transparency, JPEG excels at photographs, and WebP offers superior compression for modern browsers. This tool eliminates the need for desktop software or online services by converting images instantly in your browser, keeping your data private and avoiding upload limits.

Simply drag and drop your image or click to select a file, then choose your target format from the options. The conversion happens entirely on your device—no server upload, no processing delay, no file size restrictions. Once ready, download your converted image with a single click. The tool automatically preserves image quality while compressing for efficient storage and faster web delivery.

Developers love this tool for optimizing website assets before deployment, while photographers and social media managers use it to prepare images for different platforms. Whether you're reducing file size for email, creating thumbnails, or ensuring compatibility across browsers, this format converter works on desktop and mobile devices with no installation or account required.

Frequently Asked Questions

Code Implementation

# Convert between image formats using Pillow
# pip install Pillow

from PIL import Image
import os

def convert_image(input_path: str, output_path: str, format: str = None,
                  quality: int = 85, optimize: bool = True) -> None:
    """
    Convert an image to a different format.
    format: "JPEG", "PNG", "WEBP", "BMP", "TIFF", "ICO", "GIF"
    quality: 1-95, applies to JPEG and WebP
    """
    img = Image.open(input_path)
    output_format = format or os.path.splitext(output_path)[1].lstrip(".").upper()
    if output_format == "JPG":
        output_format = "JPEG"

    # JPEG requires RGB (no alpha)
    if output_format in ("JPEG",) and img.mode in ("RGBA", "P", "LA"):
        background = Image.new("RGB", img.size, (255, 255, 255))
        if img.mode in ("RGBA", "LA"):
            background.paste(img, mask=img.split()[-1])
        else:
            background.paste(img.convert("RGBA"), mask=img.convert("RGBA").split()[-1])
        img = background

    save_kwargs = {}
    if output_format == "JPEG":
        save_kwargs = {"quality": quality, "optimize": optimize, "progressive": True}
    elif output_format == "WEBP":
        save_kwargs = {"quality": quality, "method": 6, "lossless": False}
    elif output_format == "PNG":
        save_kwargs = {"optimize": optimize, "compress_level": 6}
    elif output_format == "ICO":
        # ICO supports multiple sizes in one file
        save_kwargs = {"sizes": [(16, 16), (32, 32), (64, 64), (128, 128)]}

    img.save(output_path, format=output_format, **save_kwargs)
    print(f"Saved: {output_path}")

# Batch convert an entire folder
import glob

def batch_convert(input_pattern: str, output_format: str, quality: int = 85):
    for path in glob.glob(input_pattern):
        base = os.path.splitext(path)[0]
        ext = output_format.lower().replace("jpeg", "jpg")
        out = f"{base}.{ext}"
        convert_image(path, out, format=output_format, quality=quality)
        print(f"Converted: {os.path.basename(path)} -> {os.path.basename(out)}")

# Examples
convert_image("photo.jpg", "photo.png")                    # JPEG -> PNG
convert_image("photo.jpg", "photo.webp", quality=80)      # JPEG -> WebP
convert_image("graphic.png", "graphic.jpg", quality=90)   # PNG -> JPEG
convert_image("logo.png", "favicon.ico")                   # PNG -> ICO (favicon)

# Batch: convert all PNGs to WebP
batch_convert("./images/*.png", "WEBP", quality=80)

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