PDF reduce size
The PDF is a file format that captures a printed document as an electronic image. It is ideal for web usage because it is perhaps the only format helps in reducing the size of the file and hence is easy for web transport. However at times a PDF document has a large size which is not desirable because of the time it takes in uploading and downloading. The only option left then is to reduce the size of these large PDF files which helps in easy transfer.
The factors that affect the size of the PDF are the high resolution images embedded in it, the fonts that are used in the PDF and also how these fonts are used in the document and finally the compression level of the document. Hence in order to reduce the size of the PDF these are the elements one should look to modify. Compressed PDFs help to reduce the file size while maintaining the quality of the original software. Some compression software can also remove text annotations, page labels, bookmarks etc. One other method other than compression, down sampling, can also help reduce a PDF file size by lowering the image resolution.
To reduce the size of a PDF file to the utmost the user should insert the bitmap images in such a way that the dimensions are minimized. The user should also look out for the images of best quality and use black and white images wherever possible. RGB color space is better for compression than CMYK. When color is not needed one could use grayscale. Additionally thumbnails should be turned off since vector based graphics usually work better than bitmap graphics. When it comes to graphics, vector based graphics are best because they take up less space and vector based images look better and can be scaled optimally. The user should also avoid using too many fonts because each additional font takes 40k in getting embedded. It is desirable to subset fonts rather than embedding. Free PDF compressors are available which can be used to reduce the size of the PDF.