PDF Compressor with Image Comparison
Reduce PDF file size while comparing original and compressed images side by side. Perfect for visual quality assessment.
Upload PDF File
Drag & drop your PDF file here
or
Compression Settings
Compressing your PDF file…
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Your PDF has been compressed successfully!
Download Compressed PDFImage Comparison
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Visual Comparison
See side-by-side comparison of original and compressed images to assess quality.
Size Reduction
Reduce PDF file size by up to 75% while retaining good quality for most purposes.
Advanced Settings
Control compression level, image quality, and optimization options for perfect results.
How to Compress PDF Files
Upload PDF
Drag and drop your PDF file or click to browse your device.
Adjust Settings
Choose your compression level and optimization options.
Compress & Compare
Click compress and see original vs compressed images side by side.
Download
Download your compressed PDF when satisfied with the quality.
Where to Use PDF Compression
Photography Portfolios
Compress image-heavy PDF portfolios while maintaining visual quality.
Academic Papers
Reduce size of research papers with figures and diagrams for easier sharing.
Product Catalogs
Optimize PDF catalogs with product images for faster online viewing.
Archival Documents
Digitize and compress historical documents with images for preservation.
Benefits of Visual PDF Compression
Quality Control
Visually compare images to ensure acceptable quality after compression.
Informed Decisions
Make better compression choices by seeing actual results before downloading.
Time Savings
Avoid multiple compression attempts by getting it right the first time.
Storage Optimization
Find the perfect balance between file size and visual quality.
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🧩 Frequently Asked Questions – Sejda PDF Compressor with Image Comparison
1. What is Sejda PDF Compressor?
Sejda PDF Compressor is a powerful online tool that helps you reduce the size of PDF files quickly and efficiently. It uses smart compression algorithms to keep your documents light while preserving image and text quality.
2. How does the Sejda PDF Compressor with Image Comparison feature work?
When you upload a PDF, our tool analyzes each page and image. You can view a before-and-after image comparison to ensure your compressed PDF keeps the same visual quality while reducing file size.
3. Can I compress PDFs without losing image quality?
Yes. Sejda.store offers lossless PDF compression, meaning your images remain clear and text stays sharp even after the file size is reduced.
4. Is Sejda PDF Compressor free to use?
Yes, you can use the Free PDF Compressor for basic compression. If you need advanced options such as batch compression, high-quality optimization, and image comparison previews, upgrade to PDF Compressor Pro.
5. What are the benefits of using Sejda PDF Compressor Pro?
The Pro version allows:
– Compression of multiple PDFs at once
– Custom compression levels (quality vs. size)
– Priority file processing
– Enhanced image comparison previews
– Larger upload limits and faster speeds
6. Is Sejda PDF Compressor safe and secure?
Absolutely. We protect your privacy with SSL encryption. All uploaded files are automatically deleted from our servers after processing — no one else can access your documents.
7. What types of files can I compress?
Our compressor supports standard PDF files, but it also optimizes embedded images (JPG, PNG, TIFF) within your document to ensure maximum file-size reduction.
8. Can I use Sejda PDF Compressor on mobile devices?
Yes. Sejda.store is a fully responsive web app, designed to work smoothly on desktop, tablet, and mobile browsers — no downloads or installations required.
9. What’s the difference between the free and Pro versions?
The Free Sejda PDF Compressor is great for small files and quick use. The Pro version unlocks premium tools like batch processing, higher compression ratios, and side-by-side image comparison.
10. How do I merge multiple PDFs before compression?
Use the built-in Free PDF Merger Tool available on Sejda.store. Once merged, you can compress the final PDF for easy sharing or storage.
11. Do I need an account to use the compressor?
No sign-up is needed for free use. Pro users can log in to manage files, save settings, and access advanced tools.
12. How long does compression take?
Most PDFs are compressed in just a few seconds. Larger files or those with many high-resolution images may take slightly longer depending on your connection speed.
13. Can I preview image quality before downloading?
Yes, our image comparison preview shows the difference between the original and compressed PDF so you can confirm quality before saving.
14. What is the file size limit for uploads?
Free users can upload PDFs up to 50 MB, while Pro users can handle much larger documents without restrictions.
15. Why should I compress a PDF?
Compressed PDFs are easier to email, upload, and share online. They open faster, save storage space, and maintain professional presentation for clients or collaborators.
16. Is Sejda PDF Compressor compatible with all browsers?
Yes. It works on all major browsers — including Chrome, Edge, Firefox, and Safari — without requiring any plugin or extension.
17. Can I restore my original PDF after compression?
Your original file remains safe on your device. Our tool only processes a temporary copy, so you can always go back to your original version if needed.
18. Is Sejda PDF Compressor available in multiple languages?
Yes, our interface supports several languages, making Sejda.store accessible to users worldwide.