Compress PDF helps you compress scanned and image-heavy PDFs in your browser. Choose a target size and download a smaller PDF. Processing runs in your browser — your files are processed in your browser whenever possible.
When to use Compress PDF
Many uploads enforce strict file size limits. Compress PDF automates optimization so you can get close to approximately 100KB without desktop software or manual quality sliders.
Whether you are preparing a passport photo, a scanned document, or a profile image, this tool gives you a fast, private way to prepare a compliant file.
How it works
Upload your image using drag and drop or the file picker. CompressKB reads the file into memory on your device and processes it using HTML Canvas — no server upload required.
Each page is rendered to a canvas, compressed as JPEG, and assembled into a new PDF. Text and links may not be preserved — best for scanned documents.
Your files are processed in your browser whenever possible. Your files stay on your device while you compress or convert them.
Tips for best results
Start with a reasonably sized source image. Cropping unnecessary areas before compression or resizing usually produces better visual quality at smaller file sizes.
Keep your uncompressed original as a master copy. You can always re-run the tool with different settings if needed.