Guides
Plain-English explainers on file formats, how to convert them, and how to keep your files private. Every tool we link to runs in your browser — nothing is uploaded.
Are Online File Converters Safe?
Most online converters upload your files to a server. Here is what that means for your privacy, the real risks, how to check, and the safer browser-based alternative.
HEIC vs JPG
HEIC saves space at the same quality, but JPG opens everywhere. Here is how the two formats compare and when to convert HEIC to JPG.
WebP vs PNG vs JPG
A practical guide to the three most common web image formats — how they compress, when to use each, and how to convert between them.
MP4 vs WebM vs MOV
These three video containers look similar but suit different jobs. Here is how they differ and when to convert one to another.
STL vs OBJ vs glTF
The three most common mesh formats serve very different jobs — 3D printing, general exchange, and the web. Here is how to choose and convert.
How to Compress a PDF for Email
Email attachment limits are usually around 25 MB. Here is how to shrink a PDF to fit — entirely in your browser, with no upload.
How to Make a Favicon
A favicon is the little icon in a browser tab. Here is how to make a proper multi-size .ico from any image, and where to put it.