How much smaller will my PDF get?

It varies widely. Files with redundant structure — typical of office-suite exports — can shrink noticeably. Scanned, image-heavy PDFs usually shrink very little, because their size is almost entirely image data and this tool never re-encodes images.

Is there any quality loss?

None. This is a structural optimization, not lossy compression. Text, vector graphics, and images come out exactly as they went in — only the file's internal storage is reorganized.

My scanned PDF barely shrank. What can I do?

For scans, the real weight is in the page images. A lossy route is to convert the pages with PDF to Images, compress them with Image Compress, and rebuild with Image to PDF — but you'll lose any text layer, so run Searchable PDF afterwards if you need the text back.

Why did the metadata disappear from my compressed file?

Stripping the document info fields is part of the optimization. If you need a title or author on the output, add them back afterwards with the Edit PDF Metadata tool.

Compress PDF

Reduce PDF file size. Files are processed entirely in your browser.

Drop PDF files here or browse

Max 100MB per file · Up to 10 files

About Compress PDF

PDF compression matters most for two reasons: you need to email a file that is over the inbox limit, or you are uploading documents to a portal that imposes a size cap. Convertora's compress tool is strictly lossless — it re-saves your PDF with compressed object streams and strips the document metadata, without touching a single pixel of content. Text stays selectable, images keep their exact original quality, and the layout is byte-for-byte identical when rendered.

Because nothing is re-encoded, the savings depend entirely on how wasteful the original file was. PDFs produced by office software, print drivers, or older generators often carry uncompressed structures and bloated metadata, and those can shrink meaningfully. A PDF that is mostly one big scanned image will barely change, because the image data — already the bulk of the file — is left untouched.

Like every Convertora tool, compression runs entirely in your browser. The file is parsed and re-serialized in memory on your own machine; nothing is uploaded, which makes it safe for contracts, financial statements, and anything else you wouldn't paste into a random website.

How to use it

1Drop one or more PDFs into the upload area (up to 10 files, 100 MB each).
2Click Compress. Each file is re-saved with compressed object streams, and the document info fields (title, author, subject, keywords, creator, producer) are cleared.
3Review the result: the tool shows the original size next to the compressed size with the percentage saved. If a file was already optimally stored, it tells you there was no size reduction.
4Download the output. A single file downloads as a PDF with a -compressed suffix; multiple files are bundled into one compressed-pdfs.zip.

What you get

Lossless re-serialization with compressed object streams — no quality settings to second-guess.
Metadata stripping (title, author, subject, keywords, creator, producer) as part of the pass.
Batch mode: up to 10 PDFs at once, delivered as a single zip.
Before/after size comparison so you can see exactly what was saved.

Common use cases

Trimming a report under a 25 MB email attachment limit without degrading the figures inside.
Shrinking PDFs exported from Word or PowerPoint, which are often stored inefficiently.
Cleaning author and producer metadata off a document at the same time as reducing its size.
Batch-tidying a folder of PDFs before archiving them.

Frequently asked questions

Tips

Compress after merging, not before — one pass over the final document is simpler and catches duplication introduced by assembly.
If the tool reports no size reduction, your PDF was already efficiently stored; lossy image downsampling is the only thing that would make it smaller.

100% private — runs in your browser

Convertora processes everything on your device using JavaScript and WebAssembly. Files never leave your browser, are never uploaded to a server, and are never seen by us or anyone else. The moment you close the tab, the data is gone — there is no temporary cloud copy, no log entry, no retained backup.

Because the work happens locally, processing speed depends on your device — but there are no rate limits, no daily caps, and no file size restrictions beyond what your browser can handle in memory. No signup, no account, no payment. The tool works the same in incognito mode, on a corporate network, or after the page has loaded once, even with the network disconnected.