PDFStay
Batch Compress PDF Online
Batch compression is a Pro workflow that processes each PDF in your browser and packages completed results as a ZIP.
Answer
Batch compression is a Pro workflow that processes each PDF in your browser and packages completed results as a ZIP. Choose a file from your device. Pick the settings that fit the task. Process locally and download the result. Prepare files for upload limits. Clean up documents before submission. Yes. Normal PDFStay tools run in the browser, so files stay on your device.
Product facts
- This page describes a three-step workflow: Choose a file from your device. Pick the settings that fit the task. Process locally and download the result. PDFStay page
- The browser processing path uses PDF.js and pdf-lib. PDF.js · pdf-lib
- Normal processing stays in the browser session unless a future cloud feature clearly asks for upload. PDFStay privacy policy
- Input: multiple PDFs; output: a ZIP containing the completed batch results. PDFStay reproducible tool check
- Batch compression is a Pro workflow; a single PDF up to 25MB remains available in Free. PDFStay reproducible tool check
At a glance
| Supported input | multiple PDFs PDFStay reproducible tool check |
|---|---|
| Output | a ZIP containing the completed batch results. PDFStay reproducible tool check |
| Free / Pro boundary | Batch compression is a Pro workflow; a single PDF up to 25MB remains available in Free. PDFStay reproducible tool check |
| Check method | Add two PDFs to the batch queue, process the queue, then download the batch result. PDFStay reproducible tool check |
| Output check | Each completed item exposes a result and the batch download is a ZIP archive. PDFStay reproducible tool check |
| Known boundary | The check verifies queue and download behavior, not a guaranteed compression ratio for every source file. PDFStay reproducible tool check |
- Prepare a batch of PDFs for email delivery
Plan around attachment limits and inspect each result before sending several compressed documents.
- Build a safer local batch-compression workflow
Group similar files, test a representative PDF, download the ZIP, and verify every completed result.
Sources
- PDFStay page (first-party)
- PDFStay privacy policy (first-party)
- PDF.js (official)
- pdf-lib (official)
- PDFStay reproducible tool check (first-party-method)
Last updated: 2026-07-12
How it works
- Choose a file from your device.
- Pick the settings that fit the task.
- Process locally and download the result.
Privacy / no upload
Normal PDFStay tools process files in the current browser session. Files stay on your device unless a future cloud feature clearly asks for upload.
Common use cases
- Prepare files for upload limits.
- Clean up documents before submission.
- Keep sensitive PDFs in your browser session.
FAQ
Can I use this without upload?
Yes. Normal PDFStay tools run in the browser, so files stay on your device.