14 guides to the formats people ask about most.
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Plain-language explanations of the file formats people wrestle with most, and what actually happens when you convert between them.
Filling the RRB NTPC form (last dates 6 and 13 Nov 2026)? The photo is captured live this year, and the signature band is 30-49 KB — different from bank exams. Here is how to get both right.
Filling the RRB Station Master form (CEN 08/2026, 27 Oct – 25 Nov 2026)? The photo is captured live, and the signature band is 30-49 KB. Here is how to get both right, from the detailed notification.
Since iOS 11 the iPhone saves photos as HEIC. Here is why other devices choke on them, and how to fix it in one step.
A PDF is a picture of a page; a Word file is a description of one. That difference explains every conversion quirk.
Most online PDF tools send your file to a server. Here is how to merge, split, compress and sign a PDF without it leaving your device, and when a full online service is still the better pick.
Four formats cover almost every job. Pick by what the picture is and where it is going, not by habit.
QuickTime MOV and MP4 are near-identical containers, so why does one play everywhere and the other not?
Android Scene Viewer, web AR and most engines want glTF. Here is how the older formats map onto it.
Most converters upload your file to a server. This one never does. Here is how you can check that yourself.
CSV is the universal spreadsheet language and Excel is the universal spreadsheet app. Moving between them is easy — with three traps.
The exact photo and signature sizes exam portals ask for, and how to make them free in your browser — nothing uploaded, no app.
Your file never leaves your device. How in-browser conversion works, why it is safer, and how to check any online tool's privacy claims in ten seconds.
A portal wants your PDF under 100 KB? Here is how to shrink it free in your browser — the file never leaves your device.
Pasting Markdown into Word leaves # and ** everywhere. Here is how to convert the .md file itself into a properly formatted Word document — free, in your browser.
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Every conversion this browser can do. Pairs that would not genuinely work are simply not offered.
Practical, plain-language answers about file formats and the conversions people ask about most.