Browser File Tools

A file does not have to leave your computer just because you open it in a web page. Browsers can read a file you select, process it in memory, and offer a download. But that depends on how the particular tool is built; check its processing notes before using sensitive files.

Keep the original

Work on a copy when you can. Image conversion may discard metadata; PDF operations may change signatures; text conversions can alter encoding. After downloading a result, open it with another program and check that it still contains what you expected.

Watch the size

A large file can use much more memory than its size on disk, especially when decoded as an image or converted to Base64. If the tab slows down, try a smaller input instead of assuming the output is ready.

Related tools

• Base64 File — Turn any file into a Base64 data string, or decode one back to a file.
• Zip Builder — Bundle several files into a zip archive in the browser, with a choice of compression level.