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or drag and drop files here
Select a PDF file to compress (up to 100MB)
Upload PDF file (100MB max)—supports scanned documents, image-heavy PDFs, text documents
Select compression level: Screen (smallest file), Ebook (recommended balance), Printer (best quality)
Click Process—server compresses in 10-30 seconds depending on size
Download optimized PDF—compare before/after sizes
Original file auto-deletes from server after 15 minutes
Screen (72 DPI): Maximum compression, 60-80% reduction. For web viewing, email attachments where quality less critical. Images downsample to screen resolution. Ebook (150 DPI): Recommended default, 40-60% reduction. Maintains readability on tablets/phones, acceptable image quality. Printer (300 DPI): Minimal compression, 20-40% reduction. Preserves print-quality images, use when quality critical.
Automatically detects embedded images and recompresses at target DPI. High-resolution photos (4000×3000) downsample to 150 DPI (Ebook preset) without visible quality loss on screens. Color images convert to optimal color space (RGB or CMYK). Removes image metadata (EXIF). Applies JPEG compression to photos, Flate to graphics.
Subsets fonts to include only used characters—reduces font data 70-90%. Embeds standard fonts as references instead of full data. Strips creation metadata, thumbnail previews, and other non-content data. Preserves document structure, links, bookmarks, form fields.
Large PDFs (50-100MB) compress in 20-30 seconds on our servers—faster than client-side JavaScript for complex documents. No browser memory limitations. Handles scanned PDFs with hundreds of high-res images that would crash browser tools.
Uploaded and compressed files automatically delete from servers after 15 minutes. No permanent storage, no manual cleanup required. Processing logs retained 24 hours for debugging only (no file content logged). Zero long-term data retention.
PDFs upload via encrypted HTTPS to our servers for compression. Files stored temporarily in isolated processing directory, auto-delete guaranteed. No human access to files during processing. No permanent storage, backups, or data mining. Processing logs contain only filename, size, timestamp—no content. For maximum privacy with sensitive documents, use browser-based tools. For documents requiring heavy optimization (scanned files, image-heavy PDFs), server compression offers 10-20× better results than browser limitations allow.
Image-heavy PDFs: 60-80% reduction (10MB → 2-4MB). Mixed content: 40-60% reduction. Text-only PDFs: 20-40% reduction (less opportunity since text already efficient). Compression depends on original quality—PDFs with 4000×3000 photos compress more than 1000×750 images. Screen preset gives maximum reduction, Printer preset minimal. Pre-compressed PDFs (already optimized) may reduce only 10-20%.
Ebook (150 DPI): Imperceptible quality loss for digital viewing. Text remains crisp, images acceptable on tablets/phones. Recommended for 95% of use cases. Screen (72 DPI): Visible image degradation—use only for drafts, email attachments where size critical. Printer (300 DPI): Near-lossless, maintains print quality. Test: compress with Ebook first, if quality insufficient try Printer. Most users can't distinguish Ebook from original on screens.
100MB maximum per file. Larger PDFs rejected. Workaround: split large PDF into chunks (PDF Split tool), compress each separately, merge after compression (PDF Merge tool). For 500MB+ PDFs, use desktop tools (Adobe Acrobat, Ghostscript command-line) which have no size limits. Processing time: 1MB = 1 second, 50MB = 25-30 seconds typical.
No. Compression permanently discards image data via downsampling and lossy JPEG compression. Ebook 150 DPI compression throws away 75% of pixels from 600 DPI scanned images. Cannot reconstruct original. Always keep uncompressed originals as backup. For archival purposes, compress copies only—never compress sole copy of important documents.
Browser tools limited by JavaScript performance and memory. Large PDFs (50MB+) crash browsers or take 5-10 minutes. Server processes in 20-30 seconds with professional algorithms. Browser can't access system fonts, can't optimize as aggressively. Trade-off: server compression requires upload (privacy consideration), but delivers 10-20% better compression ratios for complex documents.
Encrypted PDFs must be decrypted before compression. Remove password using PDF editing tool first, then compress, then re-encrypt if needed. We cannot process encrypted files. For secured PDFs, ask document owner for unencrypted version or password.
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