Merge PDF
Combine multiple PDF files into one document. Drag to reorder pages before merging.
Compress PDF
Compress PDF files with three calibrated presets for predictable output. Free online tool, files up to 200MB, no signup required.
3 free operations remaining today
Drop your PDF here
or click to browse your files
Max 200 MB per file
How to Compress a PDF
Smart PDF Lab compresses PDFs in three steps with three calibrated quality modes.
- 1
Upload your PDF.
Drop your PDF file or click Browse files to upload documents up to 200MB.
- 2
Choose your compression mode.
Select between lossless, balanced, or maximum compression based on your output target.
- 3
Download the result.
Your compressed PDF is ready to save directly to your device.
Why Compress PDFs With Smart PDF Lab
Smart PDF Lab is engineered for predictable compression results, not guesswork. Three calibrated presets give you control over quality and file size: lossless preserves every detail, balanced reduces file size for email, and maximum optimizes for the smallest possible output.
Compress PDFs up to 200MB, with no signup, no watermark, and no daily limit. Output is tested across thousands of document types to preserve formatting and readability.
Three Compression Modes Explained
- Lossless — Removes redundant data without changing image or text quality. Ideal for archival or print where every detail must be preserved.
- Balanced — Trims images and embedded fonts to roughly half the original size while keeping text crisp. Best for email and web sharing.
- Maximum — Applies aggressive optimization for the smallest possible output. Use when uploading to size-restricted forms or emailing large reports.
Frequently Asked Questions
How small will my PDF be after compression?
File size reduction depends on your source PDF and selected mode. Balanced mode typically halves file size. Maximum mode reduces files by 70 percent or more.
Will compression affect my PDF quality?
Lossless preserves every detail. Balanced and maximum reduce image and font quality slightly to achieve smaller files. Text remains readable in all modes.
Is there a file size limit?
Smart PDF Lab supports PDFs up to 200MB on every compression mode. Files process on our servers and auto-delete after conversion.