Compress PDF

Strip metadata and re-encode object streams to shrink your PDF. Runs in your browser.

Note: lossless metadata + object-stream compression. For heavy image-heavy PDFs we'll add an image-recompression pass in a follow-up.

PDFs grow over time as embedded fonts, metadata, and outdated object streams pile up. Converterzilla's PDF compressor walks through your document, drops the metadata that no one reads, and re-encodes object streams more efficiently. The result is a smaller file with identical visual output. The tool runs in your browser, so there's no upload queue and no privacy trade-off.

How to use Compress PDF in your browser

  1. Drop the PDF you want to shrink. Drag a single PDF into the drop zone or click to select one. The original stays on your disk untouched.
  2. Click Compress PDF. Converterzilla strips title, author, keyword and producer metadata, then re-saves the document using packed object streams.
  3. Check the size savings. We show before-and-after sizes plus the percentage saved so you can decide whether to keep the compressed copy or the original.
  4. Download the smaller file. Click Download to save the compressed version as filename-compressed.pdf alongside your original.

Why use Converterzilla for Compress PDF

Lossless compression

Visible content — text, images, fonts — is unchanged. We only remove metadata and re-pack the file structure.

Honest size reporting

We tell you exactly how many bytes were saved. No misleading percentages, no padding the numbers.

Privacy by design

Compression happens in your browser. Even if your PDF contains contracts, medical records or financial data, it never leaves your device.

Fast on big files

Most documents finish in under five seconds, even at 50+ MB, because we never upload or queue them.

Frequently asked questions about Compress PDF

Image-heavy PDFs already use compressed JPEGs, so metadata-stripping alone yields modest savings. Image re-compression is on our roadmap and will help in those cases.

No. Visible content is preserved exactly — same fonts, same image resolution, same layout. Only invisible metadata and storage structure change.

Yes. Compression runs entirely in your browser. The file is never uploaded, transmitted or logged anywhere.

Right now you compress one at a time. Batch compression is on the roadmap — drop a folder of PDFs and get back a folder of smaller ones.

Drop the PDF into Converterzilla's compressor and click Compress. For most documents the lossless pass is enough to fit under Gmail's 25 MB attachment cap. If your file is mostly photos and the lossless pass doesn't shrink it enough, the fallback is to split the PDF into smaller chunks and email them separately while we ship the image-recompression pass.

Yes — they're preserved exactly. The compressor only touches metadata and structural overhead; signatures, form fields, hyperlinks and table-of-contents bookmarks all carry through unchanged.

Further reading and references

Related browser-based tools

Merge PDF

Combine multiple compressed PDFs into one.

Split PDF

Split before compressing to email chunks separately.

Universal Converter

Convert PDF pages to JPG/PNG for further reduction.