Compress PDF

PDF Compressor — clean up metadata and reduce overhead, right in your browser

This browser-based PDF compressor works by stripping embedded metadata (author, title, creator application, revision timestamps) and re-encoding internal cross-references using object streams — a more compact format that PDF readers parse faster. It runs entirely client-side with pdf-lib: no upload, no server, no account.

What to expect: Typical size reduction is 1–15% for PDFs with rich metadata (documents exported from Word, Acrobat, InDesign, or Google Docs that carry software fingerprints). PDFs that already have minimal metadata may see little or no change. This tool does not re-encode or downsample embedded images — for heavy image compression you need a server-side tool or PDF optimization software such as Adobe Acrobat's "Reduce File Size."

Batch mode processes multiple files in one session. Drop a folder of PDFs, click Compress All, and download results individually or as a single ZIP.

Who benefits most

• Office document exports — Word, Excel, and PowerPoint PDFs embed the author name, company, software version, and revision history. Stripping that metadata can shave 50–500 KB off a typical business document and removes inadvertent metadata disclosure before external sharing.
• Developer and CI pipelines — PDFs generated programmatically often include verbose creator tags and binary padding. Running them through a metadata pass produces leaner files for documentation portals and knowledge bases.
• Email attachments near the limit — If a 24.8 MB PDF keeps bouncing off a 25 MB cap, stripping metadata may bring it just under the threshold without splitting pages or reducing quality.
• Privacy-conscious sharing — Metadata can reveal who created a document, when, and with what software. Cleaning it before forwarding to a client or posting publicly removes those fingerprints.

How to use it

1. Drop one or more PDF files onto the upload area, or click to browse. Each file appears as a card showing the original size.
2. Click Compress All. The tool strips metadata and re-encodes cross-references for each file. The card updates with the new size and the percentage saved.
3. Download individual files or use Download All as ZIP to get everything in one archive.

Practical tips

• For image-heavy PDFs (scans, photo books, design proofs), this tool alone may not make a significant difference. Combine it with PDF Splitter to break the file into pages, reduce images externally, then re-merge.
• Run metadata cleanup before sharing contracts or reports publicly — metadata can expose internal company details and author identities.
• If you only need to strip metadata without caring about size, PDF Metadata Editor gives you field-by-field control.
• Always keep the original file. The compressed version is functionally identical, but it is good practice to archive the source for print or legal purposes.
• For batch workflows, combine with PDF Merger (merge first, then compress the result for a single clean file) or PDF Protector (compress, then password-protect before sending).

Common use cases

• Removing author and software metadata from a Word-exported PDF before sending to a client
• Trimming a 24.8 MB document to slip under Gmail's 25 MB attachment limit
• Cleaning up batch-generated PDFs in a CI/CD pipeline before serving them on a documentation site
• Preparing reports for public posting by stripping internal metadata fingerprints
• Quick size reduction pass on office PDFs before archiving in a document management system

Privacy and browser‑side processing

All processing runs locally in your browser using pdf-lib. Your PDF documents — which may contain contracts, financial statements, and business‑confidential information — never leave your device. No upload, no server round-trip, no account required.

Compress, then share: complete the PDF workflow

Compression is typically the last step before sending — you finalize the document (merge, number, watermark, protect), then compress to reduce the attachment size. It can also be a first step: if a very large PDF is causing browser memory issues during processing, split it first, process each section, then merge and compress the result.

• PDF Merger — Combine multiple PDFs into one document before compressing. Compress the merged result rather than each component separately for best results.
• PDF Splitter — Split an oversized PDF into sections when it's too large to compress in one pass, then compress each section and merge them back.
• Add Page Numbers — Number the pages before compressing. Page numbers are metadata-light and survive both metadata cleanup and rasterized compression.
• Add Watermark — Stamp the document before compressing. Watermarks added as text overlays add minimal file size, while image watermarks compress well in rasterized mode.
• Protect PDF — Encrypt the compressed result before sharing externally. Compression removes metadata; encryption keeps the content private.
• Unlock PDF — Password-protected PDFs need to be decrypted before compression can run. Unlock, compress, then re-protect if needed.
• PDF to JPG — Render specific pages as images instead of compressing. Use this when you only need visual page renders rather than a smaller PDF file.
• PDF to Text — Extract the text content of a PDF when you need it for analysis or copy-paste, and size is not the main concern.

Related searches and tools

People who compress PDFs often also use PDF Merger (combine files before compressing the result), PDF Splitter (break a large PDF into smaller pieces when compression alone is not enough), and Image Compressor (shrink individual images before they go into a PDF). All three run in‑browser with no upload.