Image tool

Free Image Converter

Convert images between JPG, PNG and WebP, control compression quality, resize with locked aspect ratio and set the background color when converting transparent PNGs to JPG. Everything runs in your browser only.

1. Upload image & adjust size

Select image file Supported: JPG, PNG, GIF, BMP, WebP
Files are not uploaded anywhere - all conversions happen in your browser only. Animated GIFs will be flattened into a single frame.
Resize (optional) Leave blank to keep original size
Width
Height

2. Choose format, quality and download

Output format Most common web formats
Focus on JPG, PNG and WebP for maximum compatibility and small file size. HEIC / AVIF require external libraries and are not supported here.
Compression quality Used for JPG and WebP only
90%
Higher quality gives a larger file size. For web usage, 75% to 90% is usually a good balance.
Original file
No file selected
Original size
-
Output format & size
-
Estimated size will appear after conversion.

How this browser based image converter works

This tool uses the HTML5 canvas API directly in your browser. When you upload a file, your image is loaded using JavaScript, drawn onto an invisible canvas, and then exported again in the format and size you choose. No files are uploaded to any server, which makes it fast and privacy friendly.

Supported input and output formats

Modern browsers can load most common raster formats. This tool focuses on the formats that designers, developers and content creators use most often:

  • Input: JPEG, PNG, GIF, BMP, WebP (first frame for animated GIFs).
  • Output: JPEG, PNG and WebP using canvas.toDataURL.

Newer formats like HEIC and AVIF require heavy external libraries or server side processing, which goes against the idea of a simple, static and secure conversion utility.

Resizing vs real upscaling

Resizing with the canvas API is perfect for downsizing images, for example when you need smaller versions for a website, blog or e commerce listing. When you reduce the dimensions, you usually get a smaller file and the visual quality often improves a little because noise and minor artifacts become less visible.

Upsizing is a different story. When you increase the width and height of a bitmap image, the browser has to invent new pixels between the old ones. This works for small changes, but large jumps in size will always lead to a softer, more blurry result. For true high quality upscaling you need machine learning based tools that run on powerful servers, which is outside the scope of a simple static site.

Why background color matters for PNG to JPG

PNG and WebP support transparency, while JPG does not. If you convert a logo with a transparent background into a JPG without specifying a background color, different tools may default to black, white or grey. This converter lets you choose the exact color used to replace transparent pixels so your images look correct against the background where you plan to use them.

Optimising for web and performance

Web performance and bandwidth are closely tied to image size. By combining:

  • Conversion to an efficient format like JPEG or WebP.
  • Reasonable compression (for example 80 to 90 percent quality).
  • Resizing to the maximum dimensions actually needed on screen.

you can often cut file sizes by more than half with only a small or even unnoticeable impact on visual quality. The original and estimated file size indicators in this tool give you a quick feel for how your choices affect output size before you upload your images to a website or platform.