PDF Compressor
Reduce PDF file size while keeping quality
Free PDF compressor — shrink file size in your browser
Toololis PDF Compressor reduces PDF file size by stripping metadata and optimizing the PDF object structure. Fast, private, and browser-based. Best for shrinking PDFs for email attachments, cloud storage, or web upload limits.
How to use this tool
- 1
Upload a PDF
Drop your PDF or tap to browse. File size appears once loaded.
- 2
Click Compress
The tool strips metadata, unused objects, and optimizes compression streams. Works best on PDFs with bloated metadata or scanned images.
- 3
Compare before and after
The result shows original vs compressed size. Download if the savings are meaningful.
What this tool does
- Removes metadata — Author, creation tool, edit history, timestamps
- Removes unused objects — Orphaned resources, duplicate font subsets
- Optimizes object streams — More compact PDF syntax
- Preserves visual content — No image recompression, no quality loss
What this tool doesn\'t do
- Resample / recompress embedded images (desktop tools do this)
- Convert color → grayscale
- Downsample fonts
For those, use Adobe Acrobat Pro, Ghostscript, or a dedicated online service.
Frequently Asked Questions
How much compression can I expect?
Typically 5–30% size reduction via metadata stripping and object compression. PDFs that are mostly scanned images can sometimes compress 40–60%. Pure text PDFs may not compress much — they're already small.
Why is browser-based PDF compression limited?
The biggest PDF bloat is uncompressed embedded images. Proper image recompression requires decoding, resizing, and re-encoding — which would take much longer than server-side tools. This tool focuses on safe, fast object-level optimization.
Will compression affect quality?
No visible quality loss from this tool. We don't resize or recompress images here — only remove metadata and optimize PDF structure. Your document remains pixel-identical.
Are my PDFs uploaded?
No. All processing happens in your browser. Perfect for confidential business documents, medical records, or financial statements.
What if the file gets bigger after compressing?
Rare but possible. If the original was heavily optimized already,
pdf-lib's output might be slightly larger due to different object ordering. The tool warns you and you can keep the original.For bigger savings, what should I do?
For serious compression (50%+), use desktop tools like Adobe Acrobat Pro (which resamples images to 150 DPI) or online services that do image resampling. This tool is fast and private — it trades max compression for never touching your data.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.