PDF compressor not working? Here's how to fix it
Most issues are small and fixable in seconds. Work through these in order.
1. The tool won't load
Reload the page or open it in a fresh tab. If an extension blocks scripts, use private (incognito) mode — the compressor needs JavaScript, which is on by default in every modern browser.
2. The file won't open or upload
Check the format and size. Compress PDF accepts PDF up to 100 MB. If your file is larger, split it first, or make sure the extension is actually `.pdf` (a file renamed from another type will be rejected).
3. The size is barely shrinking
This is usually because the PDF is already efficient or image-heavy. Choose a stronger compression level, set a specific target size, or — for scans — reduce resolution before converting. Text PDFs shrink far more than photo scans.
4. The output looks blurry or pixelated
You compressed too aggressively for the content. Re-run with a lighter level or a larger target size. Image-heavy documents lose quality fastest, so keep a backup of the original.
5. Nothing downloads
Check your browser's download location and pop-up/file settings. Many browsers quietly block automatic downloads from new sites — allow them or click the explicit download button.
Still stuck?
Try a different current browser (Chrome, Firefox, Safari, Edge). Because the tool runs locally, a fresh environment usually resolves remaining edge cases.
Verdict
Most Compress PDF problems are solved by a reload, a supported file, a lighter compression level, or a private window.