PDF Compressor - Reduce PDF File Size Online

Compress PDF files in your browser. Remove metadata, optimize structure, flatten forms. Choose quality presets for web or email. Private, no uploads.

Choose PDFs

PDF files

Drop PDF files here or click to select

Add multiple PDFs to compress them in a batch.

Compression Settings

Quality Preset Higher quality = larger file size. Screen preset is recommended for most use cases.

Remove metadata (title, author, dates, XMP)

Flatten form fields (converts interactive forms to static content)

Optimize structure (remove unused objects)

Append "-compressed" to filename

Files

Email Attachment Size Limits

Email Provider	Attachment Limit	Recommendation
Gmail	25 MB	Use Google Drive for larger files
Outlook / Hotmail	20 MB	Use OneDrive for larger files
Yahoo Mail	25 MB	Compress or split files
iCloud Mail	20 MB	Use Mail Drop for up to 5 GB
ProtonMail	25 MB	Split into multiple emails

Most corporate email servers enforce 10-15 MB limits. When in doubt, compress to under 10 MB or use cloud sharing.

How It Works

Add PDFs
Drag & drop or use the file picker

Compress
Optimize and reduce file size

Download
Save individual files or ZIP

Frequently Asked Questions

Reduction varies by document type. Text-heavy PDFs may see 10-30% reduction through structure optimization and metadata removal. Image-heavy PDFs have limited compression in browsers due to technical constraints, but flattening and cleanup still help.

Screen (72 DPI) is ideal for online viewing and email attachments under 10MB. eBook (150 DPI) balances quality and file size for general sharing. Print (300 DPI) preserves maximum detail but offers minimal compression.

This tool focuses on lossless compression through metadata removal, structure optimization, and form flattening. Visual content remains unchanged. For true image recompression, desktop tools with advanced codecs are more effective.

Most email providers limit attachments to 10-25MB to reduce server load, prevent mailbox quota issues, and speed delivery. Gmail allows 25MB, Outlook 20MB, Yahoo 25MB. Larger files should use cloud sharing links instead.

Form fields are interactive elements (text boxes, checkboxes, dropdowns) that add complexity to PDFs. Flattening converts them to static content, removing interactivity but reducing file size and ensuring consistent display across all viewers.

No. Encrypted PDFs cannot be loaded or modified without the correct password. Remove encryption first using PDF software that supports your document's security settings, then compress the unlocked version.

Yes. All processing happens locally in your browser using PDF-lib. Files never leave your device, no server uploads occur. The tool works offline once loaded, ensuring complete privacy for sensitive documents.

Document info fields like title, author, subject, keywords, creator application, producer, creation date, and modification date. Optional XMP metadata packets are also stripped. This prevents exposing authorship and editing history.

PDFs can accumulate unused objects, duplicate references, and inefficient encoding from repeated edits. The tool saves with object streams and removes unused elements, creating a cleaner file structure without altering visible content.

Yes. Add multiple files via drag-and-drop or file picker. The tool processes each one sequentially with a progress bar. When finished, download individually or as a ZIP archive for convenience.