One of the most common pieces of feedback we get is simple: "your 50MB limit is too small for my file." Scanned contracts, architectural drawings, photo-heavy reports, and design portfolios routinely exceed that, and asking people to split a document just to compress it defeats the purpose.
So we changed it. The PDF Compressor now accepts files up to 200MB — a 4x increase — with no change to how the tool works: everything still happens locally in your browser, and your file is never uploaded to a server.
Why We Raised the Limit
The old 50MB ceiling was conservative, set when we first launched the tool. Since then we've heard from users trying to compress:
- Multi-hundred-page scanned PDFs from flatbed or document-feed scanners
- Architectural and engineering drawings exported at high resolution
- Photography portfolios and print-ready brochures bundled into a single PDF
- Long academic theses and reports with embedded high-resolution figures
All of these are exactly the kind of files that benefit most from compression — and exactly the kind of files that were being turned away by the old limit.
What Actually Changed
Functionally, nothing changed except the number. The compressor still:
- Runs entirely in your browser using
pdf-libandpdf.js— no server-side processing - Lets you choose a compression level (Light, Balanced, or High) to control the size/quality trade-off
- Re-renders embedded images at a lower DPI to shrink file size while keeping text sharp
- Never transmits your file anywhere — it's processed and downloaded on the same device
What "in your browser" means for a 200MB file
- Your device does the work, so processing time depends on your device's speed, not your internet connection
- Nothing is uploaded — there's no waiting on a slow connection to send a 200MB file anywhere
- For very large files, keep the tab open and avoid switching away until processing finishes
Tips for Compressing Large PDFs
1. Start with "Balanced". It typically reduces image-heavy PDFs by 50-70% with no visible quality loss, and is the best starting point for most large scans and reports.
2. Use "High" for archival or email-only copies. If the file is mostly going to be read on screen rather than printed, the High setting can shrink even the largest files dramatically.
3. Close other heavy browser tabs first. Since processing happens on-device, freeing up memory helps large files process more smoothly — especially on laptops and phones.
4. Still over 200MB? Try our PDF Splitter first to break the document into smaller sections, compress each section individually, then use Merge PDF to recombine them if needed.
Try It on Your Largest File
Have a scanned document or report that's been too big to compress until now? Give it a try — it's free, it's private, and there's nothing to install.
Compress a PDFWhat's Next
We're continuing to tune Quick Merge based on real usage — if there's a limit, format, or feature that's getting in your way, let us know. Small changes like this one are usually the result of exactly that kind of feedback.