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Glossary
A PNG file is a lossless image format that preserves transparency and sharp detail. Learn what PNG is used for, when it is better than JPG or PDF, and how to convert or open a PNG.
Glossary
A CSV file is a plain text format that stores data using commas as separators. Learn what a CSV file is, how it differs from Excel, how to open or create one, and when to convert it.
Glossary
Discover whats behind MP3 compression, its rise to a global standard, and how it compares to WAV and AAC for quality and efficiency.
Glossary
Learn what a ZIP file is, what .zip files are used for, and how to open, extract, and create ZIP archives on Windows, Mac, and mobile — including the easiest way to open ZIP files on iPhone.
Glossary
Learn what a HEIC file is, why iPhones use the HEIC image format, how to open HEIC files on Windows or Mac, and how to convert HEIC to JPG or PNG.
Glossary
DOCX files are the universal document format. Learn how to open, view, edit, and convert DOCX without Microsoft Word using free tools.
Knowledge Base
The best e-reader for file-type flexibility depends on your library. Kindle supports Amazon’s AZW and PDF formats, while Kobo, PocketBook, and Onyx Boox handle open standards like EPUB, MOBI, and CBR. For the broadest compatibility, Kobo and PocketBook offer the greatest freedom.
Knowledge Base
JPG and PNG look similar, but they serve different purposes. Learn the real difference in size, quality, transparency, and when to use each format.
Knowledge Base
Learn how to zip and unzip files on Windows, macOS, Android and iOS, when ZIP compression isn’t enough, and how Documents.io can shrink big PDFs, images and videos without installing extra software.
