Compress PDF
Reduce the file size by re-optimizing its content.
How to compress a PDF and reduce its size online
Upload the PDF you want to compress
Drag your file or click to select it. The compressor analyzes the content (text, images or scans) to work out how much the PDF's size can be reduced without losing visual quality.
Let the tool optimize the file
In seconds, the PDF is re-optimized to lower its size. The content isn't rewritten or edited: only the file size is reduced, ideal for attaching to an email or uploading to a website.
Download your compressed PDF
You'll see how much the size has dropped in KB or MB before downloading it. The whole process of compressing your PDF happens in your own browser, without uploading the file to any server.
Why compress your PDFs on PDFDocks?
Most online PDF compressors require you to upload the file to a server for processing, which means your document—quotes, contracts, records, whatever it is—passes through a third party's hands before coming back compressed. On PDFDocks, compression is done with JavaScript, directly in your browser: the file never leaves your device. This has an interesting practical consequence: since you don't need to upload the full PDF to an external server, the process is usually faster, especially with large files, because you save the time spent uploading and downloading over the internet. There's also no waiting queue from other users sharing the same server. The other common question is how much the size can be reduced without it being noticeable: the answer depends on the content. A PDF with many images or scanned documents can be reduced significantly, because that's usually where the file's real weight is; a PDF that's already mostly text has much less compression margin, simply because text takes up little space to begin with.
How much can I reduce a PDF?
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Yes. Your file is never uploaded to a server: compression is performed directly in your browser with JavaScript, so the PDF never leaves your computer at any time.
How much is my PDF file size reduced?
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It depends on the content. PDFs with many images or scanned documents usually reduce significantly, because that's where most of the weight is. PDFs that are almost entirely text have less compression margin, since text takes up little space to begin with.
Is my PDF uploaded to a server when using this tool?
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No. The entire analysis and compression process happens in your own browser, with the file never traveling over the internet at any point.
Can I compress scanned PDFs?
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Yes, no installation needed. It works directly from your browser, on desktop or mobile, without creating an account or downloading additional software.
Will PDF compression cause noticeable quality loss?
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Compression is designed to reduce file size while maintaining acceptable visual quality for most uses (email, uploading to the web, printing). In documents with many images, some quality loss may be noticeable if the compression level is high.
Is there a size limit for compressing a PDF?
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We haven't imposed any artificial limits. Since the process happens in your own browser, you can compress files of any size — the only real limit is the available memory on your device.
Tools
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Combine several PDFs into one file, in any order you like.
Split PDF
Extract specific pages or split your PDF into ranges.
Rotate PDF
Rotate the pages you need, one by one or all at once.
PDF to images
Convert every page into a high-quality PNG image.
Images to PDF
Combine your photos or images into a single PDF document.
Watermark
Add overlay text to every page of your PDF.
Protect PDF
Add a password to restrict access to the file.
Unlock PDF
Remove the password from a PDF if you know it.
Remove pages
Delete the pages you don't need from your PDF document.
Extract pages
Select and save only the pages you need.
Reorder PDF
Freely reorganize, move or rearrange the pages in your document.
Crop PDF
Remove margins or adjust the visible area of the page.
Page numbers
Add page numbering with custom position, style and font.
Fill PDF forms
Detect fields and fill in existing PDF forms.
Sign PDF
Draw your signature and stamp it onto any page of the document.
Scan to PDF
Capture documents from your phone and send them straight into a PDF.
OCR PDF
Turn scanned PDFs into documents with selectable, searchable text.
PDF to Markdown
Extract your PDF's content into editable Markdown text.
Markdown to PDF
Convert a Markdown file (.md) into a PDF document with formatting already applied, without uploading anything to a server.
PDF to Text
Extract text from a PDF and download it as a .txt file, free and without uploading your document to any server.
Word to PDF
Convert Word (.docx) documents into PDF format.
PDF to Word
Extract text from your PDF into an editable Word document (.docx).
Excel to PDF
Turn Excel spreadsheets (.xlsx) into PDF documents.
PDF to Excel
Extract text and tables from your PDF into an Excel spreadsheet (.xlsx).
Compare PDF
Place two versions of a PDF side by side to spot the differences.
Redact PDF
Permanently cover up text or graphics containing sensitive information.
Repair PDF
Attempt to recover and fix damaged or corrupted PDF files.
JPG to PDF
Convert one or several JPG photos into a single PDF document.
PDF to JPG
Convert every page of your PDF into a JPG image.
PNG to PDF
Convert one or several PNG images into a single PDF document.
PDF to PNG
Convert every page of your PDF into a high-quality PNG image.
WEBP to PDF
Convert one or more WEBP images into a single PDF document.
PDF to WEBP
Convert each page of your PDF into a lightweight, high-quality WEBP image.
HEIC to PDF
Convert one or multiple HEIC photos (iPhone format) into a single PDF document.
HTML to PDF
Convert an HTML file into a PDF document, preserving layout and styles, without uploading anything to a server.
EML to PDF
Convert an email (.eml) into a PDF document, including sender, recipient, subject, and message body.
MHT/MHTML to PDF
Convert a web page saved in MHT or MHTML format into a PDF document.
