PDFStay
Compress Images in PDF Online
Reduce embedded image size in image-heavy PDF files while ordinary work stays in your browser.
Answer
Reduce embedded image size in image-heavy PDF files while ordinary work stays in your browser. 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: image-heavy PDF; output: one PDF with the image-compression workflow applied. PDFStay reproducible tool check
- Free use covers one PDF up to 25MB; larger files, batch work, and advanced parameters are Pro. PDFStay reproducible tool check
At a glance
| Supported input | image-heavy PDF PDFStay reproducible tool check |
|---|---|
| Output | one PDF with the image-compression workflow applied. PDFStay reproducible tool check |
| Free / Pro boundary | Free use covers one PDF up to 25MB; larger files, batch work, and advanced parameters are Pro. PDFStay reproducible tool check |
| Check method | Choose an image-heavy PDF and run the image-compression workflow with its default setting. PDFStay reproducible tool check |
| Output check | The result downloads as a PDF after the image-compression workflow completes. PDFStay reproducible tool check |
| Known boundary | Image compression is source-dependent; no fixed file-size or image-fidelity result is promised. PDFStay reproducible tool check |
- Understand image quality and file-size tradeoffs
Compare downsampling and lossy image compression before choosing settings for an image-heavy PDF.
- Find the space-hungry parts of an image-heavy PDF
Check whether resolution, color, embedded assets, or existing compression is driving the file size.
- Measure image resolution at its placed size
Use effective PPI, intended output, and visual checks instead of assigning one DPI value to the whole PDF.
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.