Guides

Longer answers to the file questions a tool button alone cannot settle — which FFmpeg flags actually matter, what a DPI tag does and does not change, why a photo arrives sideways. Each one is written against files we ran ourselves, and where a guide gives a number, that number came from a measurement rather than from another article.

Images and photos

Convert an image to 300 DPI

Set the tag in one step, and see the pixel dimensions a sharp 300 DPI print actually needs.

Favicon sizes

32×32 is one frame inside one of the files — here is the whole set, and why.

EXIF Orientation

The photo is not sideways — one byte tells viewers to turn it, and some of them ignore it.

Documents

How to convert TXT to Word

Get a real .docx out of a plain text file — with the accents, quotes and dashes still intact.

Archives and developer tasks

How to create a tar.gz file

Build one in your browser or with one tar command — plus every tar flag worth remembering.

Convert .tar.gz to ZIP

The ZIP is usually the bigger file — measured, with the reason and the numbers.

Audio and video

MP4 to GIF with FFmpeg

The one-line command bands your colours. Here is the two-pass fix, and what it measures.

Add audio to a video with FFmpeg

The command everyone copies keeps the wrong audio. Here is what it does, measured, and the fix.

Every guide sits next to the tool it describes, and both run entirely in your browser — nothing you open is uploaded to Filesvo.