All 28 tools, and how to pick the right one

BuzzKit is a set of twenty-eight free online file tools that run entirely inside your browser tab. Nothing you open here is uploaded to a server, which is the main reason the site exists: the moment a file leaves your device you lose any ability to verify what happens to it. Every tool below processes your file locally, on your own hardware, and the result never travels anywhere you did not send it yourself.

The tools are grouped into four categories, and the difference between them is not just the file type. Each category uses a different underlying technology, and that shapes how fast it runs, how large a file it can realistically handle, and whether it works offline.

How to choose between our free online file tools

Choosing between similar tools is usually the harder question. A few rules of thumb that cover most cases: if you want a file to be smaller, reach for a compressor, not a converter, because changing a container format rarely reduces size on its own. If you need a file to open in a different program, that is a converter job. If you only need part of a file, trim it first and then convert or compress the shorter result, because every tool runs faster on less material and you avoid processing footage you were going to discard anyway.

Order matters more than people expect. Trimming before compressing gives a noticeably better result than compressing then trimming, since the compressor spends its quality budget only on the frames you actually keep. The same logic applies to images: crop or resize before compressing, so the compressor is not preserving detail in pixels you are about to throw away.

Finally, a realistic note on limits. Because the work happens on your device rather than on a server farm, performance depends entirely on the machine you are using. A modern desktop handles large video comfortably. A phone with limited memory may struggle with a long 4K clip, and very large files can exhaust a browser tab's available memory. Where a tool has a practical ceiling, its own page says so plainly rather than letting you discover it halfway through a job.