PDF Compressor
Compress PDF files securely in your browser. Your documents are never uploaded to a server, ensuring sensitive data remains completely private.
Reduce PDF file size for easier sharing and emailing with SolveBar's PDF Compressor. Removes redundant metadata, optimizes cross-reference tables, and compresses object streams — all in your browser without uploading your documents to any server.
What PDF compression actually does
Browser-based PDF compression works by removing embedded metadata, optimizing the internal cross-reference table structure, and enabling object stream compression. It does not re-compress embedded images. For PDFs bloated with metadata and inefficient structure, reduction can be substantial.
When to compress PDFs
Email attachments over 10MB are often rejected by email servers. File upload limits on web forms (many cap at 5-10MB) are another common reason. For archiving large PDF libraries, compression reduces storage costs.
Limitations of browser-based compression
For maximum compression (especially of image-heavy PDFs), native tools like Ghostscript achieve better results because they can re-encode images at lower quality. Browser compression is faster and more private but less aggressive on image content.
Frequently Asked Questions
How much smaller will my PDF be?
Varies significantly by file content. Metadata-heavy PDFs may shrink 20-40%. Image-heavy PDFs may see only 5-10% reduction. Text-only PDFs often see 15-25% reduction.
Will compression affect text readability?
No. Text is not re-encoded during compression — only structural overhead is removed. Text quality is preserved identically.
My PDF barely got smaller — what can I do?
The file is likely large due to high-resolution embedded images. For aggressive image compression, use Ghostscript on the command line.