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  2. Smallpdf.com - Wikipedia

    en.wikipedia.org/wiki/Smallpdf.com

    Smallpdf is a Swiss online web-based PDF software, founded in 2013. [2] It offers free version with limited features to compress, convert and edit PDF documents. [ 3 ] And its paid version offers advanced features like OCR, compress, and more [ 4 ] .

  3. Lossless compression - Wikipedia

    en.wikipedia.org/wiki/Lossless_compression

    The Compression Ratings website published a chart summary of the "frontier" in compression ratio and time. [15] The Compression Analysis Tool [16] is a Windows application that enables end users to benchmark the performance characteristics of streaming implementations of LZF4, Deflate, ZLIB, GZIP, BZIP2 and LZMA using their own data. It ...

  4. Data compression - Wikipedia

    en.wikipedia.org/wiki/Data_compression

    This is the same as considering absolute entropy (corresponding to data compression) as a special case of relative entropy (corresponding to data differencing) with no initial data. The term differential compression is used to emphasize the data differencing connection.

  5. Lossy compression - Wikipedia

    en.wikipedia.org/wiki/Lossy_compression

    Left side of the image is from a low-quality JPEG image, showing lossy artefacts; the right side is from a PNG image. In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used ...

  6. PAQ - Wikipedia

    en.wikipedia.org/wiki/PAQ

    Another feature is PAQ7's ability to compress embedded jpeg and bitmap images in Excel-, Word- and pdf-files. PAQ8A was released on January 27, 2006, PAQ8C on February 13, 2006. These were experimental pre-release of anticipated PAQ8. It fixed several issues in PAQ7 (poor compression in some cases).

  7. Attach or insert files, images, GIFs and emojis in New AOL Mail

    help.aol.com/articles/attach-files-or-insert...

    In AOL Mail, click Compose.; Click the Attach icon. - Your computer's file manager will open. Find and select the file or image you'd like to attach. Click Open.; The file or image will be attached below the body of the email.