Compress PDF using JavaScript
Compress and reduce a PDF file size by up to 90%
Compress PDF features
The Compress PDF JS module by ConvertAPI is a tool that allows for the compression and reduction of PDF file sizes by up to 90%. This JS module optimizes PDF quality by compressing text, graphics, images, subsetting fonts, and optimizing document structure. It offers various parameters for customization, including compression presets, color and grayscale image compression, and options to remove elements like bookmarks, annotations, forms, and embedded files from the PDF. The JS module also provides options for optimizing the PDF for web viewing and preserving the PDF/A standard.
ConvertAPI JavaScript library install
ConvertAPI provides a JavaScript module that allows you to perform a Compress PDF conversion with just a few lines of code.
First, install the convertapi-js@~1.1 package from npm:
NPM package >
npm i convertapi-js@~1.1
If you are interested in our old version of non-module JavaScript library you can find it here.
Authenticate your JavaScript library
Next, obtain your secret key by signing up for a free account. Once you sign up, you'll receive 250 free conversions instantly! Grab your authentication secret from the account dashboard, and authenticate the ConvertAPI JavaScript library like this:
import ConvertApi from 'convertapi-js'
let convertApi = ConvertApi.auth('secret_or_token')
Compress PDF using JavaScript in no time!
Once you have your authentication in place, simply copy-paste this pdf to compress conversion code snippet into your JavaScript project. Compress PDF documents using JavaScript with no effort at all!
Try the conversion online - no coding required!
You can try out advanced conversion parameters and test the conversion result online using our interactive demo tool. This tool will produce the same conversion output as if you were using the library from your solution, and it will auto-generate the code snippet for you!
Try for FREE!Conversion parameters
Password
String
Sets the password to open protected documents.
Presets
Collection
Choose compression level from presets. If preset is selected all other compression options are ignored.
Values: none text archive web ebook printer
ColorImageCompression
Collection
Color image compression algorithm.
Values: none jpg jpx zip
ColorImageQuality
Integer
Color image compression quality. The parameter applies only to JPX and JPG compressions.
ColorImageDownsample
Bool
Enable Bicubic image downsampling and decreases the number of pixels in the color image which in turn makes the file smaller.
ColorImageThresholdDpi
Integer
Threshold in DPI to activate color images resampling. ColorImageDownsample property must be enabled.
ColorImageResampleDpi
Integer
Color image resolution in DPI after Bicubic resampling. ColorImageDownsample property must be enabled.
GrayscaleImageCompression
Collection
Grayscale image compression algorithm.
Values: none jpg jpx zip
GrayscaleImageQuality
Integer
Grayscale image compression quality. The parameter applies only to JPX and JPG compressions.
GrayscaleImageDownsample
Bool
Enable Bicubic image downsampling and decreases the number of pixels in the grayscale image which in turn makes the file smaller.
GrayscaleImageThresholdDpi
Integer
Threshold in DPI to activate grayscale images resampling. GrayscaleImageDownsample property must be enabled.
GrayscaleImageResampleDpi
Integer
Grayscale image resolution in DPI after Bicubic resampling. GrayscaleImageDownsample property must be enabled.
MonochromeImageCompression
Collection
Monochrome image compression algorithm.
Values: none jbig2 jbig2l fax zip
MonochromeImageQuality
Integer
Monochrome image compression quality. The parameter applies only to jbig2 and jbig2l compressions.
MonochromeImageDownsample
Bool
Enable Bicubic image downsampling and decreases the number of pixels in the monochrome image which in turn makes the file smaller.
MonochromeImageThresholdDpi
Integer
Threshold in DPI to activate Monochrome images resampling. MonochromeImageDownsample property must be enabled.
MonochromeImageResampleDpi
Integer
Monochrome image resolution in DPI after Bicubic resampling. MonochromeImageDownsample property must be enabled.
RemoveBookmarks
Bool
Remove bookmarks from the PDF file.
RemoveAnnotations
Bool
Remove text annotations from the PDF file.
RemoveForms
Bool
Remove PDF forms from the PDF file.
RemovePageLabels
Bool
Remove page labels from the PDF file.
RemoveLayers
Bool
Removes hidden layers and flatten visible ones.
RemoveArticleThreads
Bool
Remove article threads from the PDF file.
RemoveTaggedInfo
Bool
Remove tagged information from the PDF file.
RemovePageThumbnails
Bool
Remove page thumbnails from the PDF file.
RemoveDuplicates
Bool
Remove duplicate fonts and color profiles from the PDF file.
RemoveAlternateImages
Bool
Removes alternate images and leave only the one for on-screen viewing.
RemoveNamedDestinations
Bool
Remove named destinations from the PDF file.
RemoveEmbeddedFiles
Bool
Remove embedded/attachments files from the PDF file.
RemovePieceInformation
Bool
Remove piece information dictionaries like Adobe Illustrator or Photoshop private data.
UnembedBaseFonts
Bool
Specifies whether to remove the base fonts from the PDF file.
SubsetEmbeddedFonts
Bool
Output PDF should only contain font characters utilized in the original document, and any unused glyphs from all fonts in the document should be removed.
CreateObjectStreams
Bool
Create object streams in the PDF file. An object stream represents a stream that contains a sequence of PDF objects. This allows a greater number of PDF objects to be compressed. Property compatible with Acrobat 6/PDF v1.5 and later.
Optimize
Bool
Optimize page content streams in the PDF file.
LzwToFlate
Bool
In streams that use LZW encoding, use Flate instead.
Linearize
Bool
Linearize PDF file and optimize for fast Web View.
PreservePdfa
Bool
Preserve the PDF/A standard in the PDF file.