Compress PDF Online Free

Reduce PDF file size for sharing, uploading and archiving. Compress one PDF or a batch of up to 100 PDFs.

Drop PDF files here or click to select Select up to 100 PDF files PDF only · up to 100 files · 50 MB each · 500 MB total
Reduce PDF size for email, forms and storage. Select one PDF or a batch, compress the files locally, then download the optimized result.

Compress PDF Online Free online

Compress and optimize one PDF or a batch of up to 100 PDF files online. Re-save PDFs with object stream compression directly in your browser and compare total size before and after.

How to use this tool

  1. Select or drop your PDF files.
  2. Review the total size before compression. After processing, compare before, after, and saved size.
  3. Click the download button to create the new file.

Compress PDF guide

Compress PDF is a high-intent tool because users often have a strict file size limit for email, job applications, government portals, school systems or business platforms. A PDF may become large because it contains images, scans, embedded fonts or multiple pages. Compression aims to reduce file size while keeping the document usable.

The page should explain that PDF compression results depend on the source file. A scanned PDF with large images may shrink more than a simple text PDF. A document that is already optimized may not become much smaller. This honest explanation improves trust and reduces confusion when users compare before and after file sizes.

Compress PDF should be linked from Merge PDF, JPG to PDF, PNG to PDF and Image to PDF because those workflows can produce larger documents. It should also link back to PDF Tools and PDF Converter so users can continue editing, converting or organizing files after compression.

Common use cases

  • Reduce PDF size for email attachments.
  • Prepare documents for upload limits.
  • Make scanned PDFs easier to share.
  • Optimize large reports or image-heavy PDFs.

Best practices

  • Start with clear images before creating a PDF.
  • Compress after merging image-heavy files.
  • Check readability after compression.
  • Use image optimization before PDF creation for smaller results.
Explore more tools

Switch between image, Base64, PDF, WebP, and text tools without leaving the toolkit.

Image to PDF Create PDF files from images JPG to PDF Convert JPG images to PDF PDF to JPG Export PDF pages as JPG images Free PDF Tools Merge, split, delete, extract, number and convert PDFs PDF Converter All PDF conversion tools in one place Compress PDF Reduce PDF file size in your browser Merge PDF Combine multiple PDFs into one file Split PDF Extract page ranges from a PDF PDF to Base64 Encode a PDF as Base64, Data URL, JSON or JavaScript JPEG to PDF Convert JPEG images to PDF PNG to PDF Convert PNG images to PDF WebP to PDF Convert WebP images to PDF HEIC to PDF Convert iPhone HEIC photos to PDF Word to PDF Create PDF files from Word content PowerPoint to PDF Prepare presentation files for PDF export Excel to PDF Prepare spreadsheets for PDF export PDF to JPEG Export PDF pages as JPEG images PDF to PNG Export PDF pages as PNG images PDF to Image Choose PDF to JPG or PDF to PNG PDF to WebP Export PDF pages as WebP images PDF to Word Extract PDF text to Word-compatible format PDF to PowerPoint Prepare PDF pages for slide export PDF to Excel Prepare PDF tables for spreadsheet export Delete PDF Pages Remove selected PDF pages Extract PDF Pages Save selected pages as a PDF Reorder PDF Pages Change PDF page order Add Watermark Add a text watermark to PDF Page Numbers Add page numbers to PDF Sign PDF Add a simple text signature PDF Metadata Editor Update PDF title and author Protect PDF Coming soon Unlock PDF Coming soon Rotate PDF Rotate PDF pages online Crop PDF Trim PDF page margins online Image to WebP Convert images to WebP JPEG to WebP Convert JPEG images to WebP WebP to JPEG Convert WebP images to JPEG WebP to PNG Convert WebP images to PNG PNG to WebP Convert PNG images to WebP Optimize Image for Web Compress and resize images locally Image Tools Image conversion and optimization tools Image to Base64 Convert PNG, JPG, SVG and GIF images to Base64 locally Base64 to Image Decode Base64 into an image preview Base64 to PNG Decode Base64 PNG strings and data URLs locally Base64 to JPG Decode Base64 JPG image data in your browser Base64 to JPEG Decode Base64 JPEG strings and preview the image Base64 Decoder Decode Base64 text and preview image data locally Base64 to PDF Decode Base64 PDF data and download a real PDF locally Base64 Image Viewer Preview encoded image data and data URLs PNG Decoder Decode Base64 PNG data online Bytes to Image Convert byte arrays into images Base64 Analyzer Analyze encoded text and Data URIs JSON Formatter Format, beautify and validate JSON locally JWT Decoder Decode JWT header, payload and claims locally URL Encode Encode text for query strings and URLs URL Decode Decode percent-encoded URL text JSON Validator Validate JSON syntax in your browser JSON Beautifier Beautify minified JSON online JSON Minifier Minify JSON into compact output JSON Viewer View and inspect JSON data online JWT Viewer View JWT claims and expiration details JWT Validator Validate JWT structure locally XML Formatter Format XML with indentation XML Validator Validate XML syntax online XML Minifier Minify XML into compact output Text Tools JSON, URL, HTML and Base64 text tools HTML Encode Escape HTML-sensitive characters HTML Decode Decode HTML entities into text
Compress PDF files for sharing and uploads Use this tool when PDFs are too large for email, forms, uploads or storage. Compress one file or a batch of up to 100 PDFs and compare total size before and after.

Compress PDF files for sharing and uploads

Use this tool when PDFs are too large for email, forms, uploads or storage. The tool re-saves and optimizes each document where possible, then shows the total size before and after compression.

How to use this tool

  1. Select or drop one PDF file, or choose a batch of up to 100 PDF files.
  2. Run the compression tool in your browser.
  3. Review the summary showing total size before and after.
  4. Download one optimized PDF or a ZIP archive for batch results.

Related PDF workflows

Compress PDF FAQ

How do I compress PDF files online?

Upload one PDF or select a batch of PDF files, then run the compression tool. The optimized result is downloaded when processing is complete.

Can I compress multiple PDFs at once?

Yes. You can select up to 100 PDF files. Batch output is downloaded as one ZIP archive.

Is PDF compression free?

Yes. You can compress a PDF online for free.

Will compression reduce every PDF size?

Compression depends on the file. Some PDFs are already optimized, while others can become much smaller.

Is my PDF uploaded to a server?

The workflow is browser-based when possible, so documents stay on your device during processing.

Explore more tools

Switch between image, Base64, PDF, WebP, and text tools without leaving the toolkit.

Image to PDF Create PDF files from images JPG to PDF Convert JPG images to PDF PDF to JPG Export PDF pages as JPG images Free PDF Tools Merge, split, delete, extract, number and convert PDFs PDF Converter All PDF conversion tools in one place Compress PDF Reduce PDF file size in your browser Merge PDF Combine multiple PDFs into one file Split PDF Extract page ranges from a PDF PDF to Base64 Encode a PDF as Base64, Data URL, JSON or JavaScript JPEG to PDF Convert JPEG images to PDF PNG to PDF Convert PNG images to PDF WebP to PDF Convert WebP images to PDF HEIC to PDF Convert iPhone HEIC photos to PDF Word to PDF Create PDF files from Word content PowerPoint to PDF Prepare presentation files for PDF export Excel to PDF Prepare spreadsheets for PDF export PDF to JPEG Export PDF pages as JPEG images PDF to PNG Export PDF pages as PNG images PDF to Image Choose PDF to JPG or PDF to PNG PDF to WebP Export PDF pages as WebP images PDF to Word Extract PDF text to Word-compatible format PDF to PowerPoint Prepare PDF pages for slide export PDF to Excel Prepare PDF tables for spreadsheet export Delete PDF Pages Remove selected PDF pages Extract PDF Pages Save selected pages as a PDF Reorder PDF Pages Change PDF page order Add Watermark Add a text watermark to PDF Page Numbers Add page numbers to PDF Sign PDF Add a simple text signature PDF Metadata Editor Update PDF title and author Protect PDF Coming soon Unlock PDF Coming soon Rotate PDF Rotate PDF pages online Crop PDF Trim PDF page margins online Image to WebP Convert images to WebP JPEG to WebP Convert JPEG images to WebP WebP to JPEG Convert WebP images to JPEG WebP to PNG Convert WebP images to PNG PNG to WebP Convert PNG images to WebP Optimize Image for Web Compress and resize images locally Image Tools Image conversion and optimization tools Image to Base64 Convert PNG, JPG, SVG and GIF images to Base64 locally Base64 to Image Decode Base64 into an image preview Base64 to PNG Decode Base64 PNG strings and data URLs locally Base64 to JPG Decode Base64 JPG image data in your browser Base64 to JPEG Decode Base64 JPEG strings and preview the image Base64 Decoder Decode Base64 text and preview image data locally Base64 to PDF Decode Base64 PDF data and download a real PDF locally Base64 Image Viewer Preview encoded image data and data URLs PNG Decoder Decode Base64 PNG data online Bytes to Image Convert byte arrays into images Base64 Analyzer Analyze encoded text and Data URIs JSON Formatter Format, beautify and validate JSON locally JWT Decoder Decode JWT header, payload and claims locally URL Encode Encode text for query strings and URLs URL Decode Decode percent-encoded URL text JSON Validator Validate JSON syntax in your browser JSON Beautifier Beautify minified JSON online JSON Minifier Minify JSON into compact output JSON Viewer View and inspect JSON data online JWT Viewer View JWT claims and expiration details JWT Validator Validate JWT structure locally XML Formatter Format XML with indentation XML Validator Validate XML syntax online XML Minifier Minify XML into compact output Text Tools JSON, URL, HTML and Base64 text tools HTML Encode Escape HTML-sensitive characters HTML Decode Decode HTML entities into text