Compare original and output sizes before downloading. If the file grows, we tell you to keep the original.
Private, browser-based compression
Make large PDFs
easier to share.
Reduce image-heavy and scanned PDF files with clear quality controls and an honest before-and-after comparison.
Need to remove pages first? Open PDF Organizer →Documents / PDF
Compress PDF
Files are processed locally. Nothing is uploaded.
3×Clear presetsLight, balanced, or strong100%Size comparisonSee the result before downloadLOCALNo uploadProcessing stays on your device
RESULTCompression completeOriginal0 BNew file0 BChange0%
FIRST PAGE PREVIEW
DOCUMENT CHECK
What compression will change
Inspecting searchable text and interactive content…
TEXTCheckingSearchable text layerLINKCheckingClickable linksFORMCheckingForm fieldsSIGNCheckingDigital signatures
This compressor creates a new image-only PDF.
Searchable text, links, form fields, layers, and certificate-based digital signatures will not remain interactive. Visual appearance is preserved as page images.
Opening PDF…
Inspecting pages and document features
Light preserves more detail, Balanced fits everyday sharing, and Strong prioritizes a smaller file.
Image-only output is explained before processing, including the effect on text, links, forms, and signatures.
Compare a scan with a text PDF
Our downloadable one-page reference pair shows why a scan can shrink while a text PDF grows. Both use Balanced settings; searchable text is lost in the image-only output.
Read the example, samples, and exact rules →Know what this compressor preserves before reducing a PDF
This workflow is designed for scanned and image-heavy PDFs. It redraws each page as an image, which can reduce large photographs and scans but also changes searchable text, links, forms, layers, and certificate signatures.
Step by step
- Inspect the document
Open the PDF and check whether you need searchable text, selectable tables, form fields, links, layers, or a certificate-based digital signature.
- Choose a preset
Light favors legibility, Balanced is a practical starting point for sharing, and Strong prioritizes size. Use custom settings only when you understand the DPI and JPEG trade-off.
- Run one comparison
Process the file and compare the reported original and output sizes. Zoom into small text, fine lines, stamps, and diagrams before accepting the result.
- Keep the safer version
Download the compressed copy only when it is smaller and still readable. Preserve the original whenever interactivity, text search, archival quality, or signatures matter.
Decision guide
- Light
- Use for documents with small print or diagrams when modest savings are acceptable.
- Balanced
- A sensible first attempt for ordinary scans, receipts, and image-heavy reports shared by email.
- Strong
- Use only when the file-size limit matters more than fine detail. Review every page afterwards.
- Custom DPI and quality
- Useful for a known delivery requirement, but low DPI and JPEG quality compound each other.
Important limits
- The output is an image-only PDF; searchable text, links, form fields, layers, and certificate signatures are flattened.
- Password-protected PDFs are not supported by this browser workflow.
- Text-first or already optimized PDFs can stay the same size or become larger.
- Compression does not repair corrupted pages, missing fonts, incorrect OCR, or damaged source images.
04 · Common questions
Common questions
Why did my PDF become larger?
A text-first or already optimized PDF can be more efficient than a new image-only copy. Keep the original when the result is not smaller.
Will the compressed PDF still be searchable?
No. The visible pages are preserved as images, but the original text layer and interactive elements are not retained.
Which preset should I try first?
Balanced is the safest general starting point. Use Light for detail-heavy documents and Strong only after checking readability.
Compress image-heavy PDFs without uploading them
Choose Light, Balanced, Strong, or custom resolution and JPEG quality. OmniKit renders one page at a time, preserves each page’s visible size and orientation, then shows the exact file-size change.
This method works best for scanned documents and PDFs containing large photos. The output is image-only, so searchable text, links, form fields, layers, and certificate-based digital signatures are flattened.