Free Online File Converter

File format incompatibility is one of the most common problems on the internet. You download a WebP image from a website, but your editor only accepts PNG. You screenshot something as a PNG, but the upload form wants JPG. You receive a BMP from a legacy system, but you need it as a modern web format.

ConvertFile solves this by converting images directly in your browser. There is no upload step, no server queue, and no third party handling your files. The HTML5 Canvas API reads your source image, re-encodes it in the target format, and hands you the result. The entire process takes under 2 seconds on most devices.

Most online converters upload your files to a remote server. That means waiting for the upload to finish, trusting the server operator with your data, and hoping they actually delete your files afterward. Some services keep copies for 24 hours. Others do not specify a retention period at all.

Browser-based conversion eliminates these concerns. Your files never leave your device. The conversion runs on your hardware using the Canvas API, so there is nothing to intercept, nothing to leak, and nothing to forget to delete. You can verify this by opening your browser's network tab during conversion — you will see zero outbound file transfers.

ConvertFile uses the HTML5 Canvas API, a browser-native technology designed for image manipulation. When you drop a file into the converter, the following happens:

1. Your browser reads the file from your local disk into memory. 2. The Canvas API decodes the image pixels into a raw bitmap. 3. The bitmap is re-encoded in your chosen output format with the quality level you selected. 4. The encoded file is offered as a download.

No network requests are made during this process. The conversion is limited only by your device's processing power, which is why it completes in under 2 seconds on modern hardware.

Every image format makes a trade-off between file size and visual fidelity. Lossless formats like PNG preserve every pixel exactly, but produce larger files. Lossy formats like JPG discard visual information that the human eye is unlikely to notice, producing much smaller files.

The quality slider in ConvertFile controls this trade-off. At 100%, the output is nearly lossless. At 85-90%, file sizes drop significantly with no visible quality loss for photographs. Below 70%, compression artifacts become noticeable around sharp edges and text. For most use cases, 80-90% is the right setting.

ConvertFile processes every file locally using your browser's built-in Canvas API. No files are uploaded to any server. No data is collected, stored, or shared. You can verify this by disconnecting from the internet after loading the page — the converter continues to work normally.

This architecture means there is no file retention policy to worry about, no data breach risk from server storage, and no third-party access to your images. Your files exist only in your browser's memory during conversion and are released when you close the tab.