QikDrive

PDF Compressor

Reduce PDF file size by compressing object streams. Works best on text-heavy PDFs and files exported from Word or PowerPoint. Runs entirely in your browser, no uploads.

Drop PDF files here, or click to select

PDF only · Multiple files supported · No uploads

How it works: This tool re-serialises your PDF using compressed object streams (ISO 32000 object stream compression). Savings are typically 5–40% for text-heavy PDFs and documents exported from Microsoft Office. Image-heavy PDFs like scanned documents may see minimal size reduction without resampling the embedded images.

Free Online PDF Compressor

Reduce PDF file size using object stream compression. Drop one or more PDFs, see the exact savings, and download instantly, no uploads, no registration, no quality loss.

Object stream compression

Re-serialises the PDF using ISO 32000 compressed object streams, removing structural overhead without touching the visual content.

Batch processing

Drop multiple PDF files in one go. Each is compressed independently so one failure does not block the others.

Before/after size comparison

See the exact original size, compressed size, and savings percentage for every file so you know exactly how much space you saved.

No quality loss

Structural compression only, text, images, fonts, and formatting are preserved exactly as-is.

No uploads, ever

Compression runs in your browser using the pdf-lib library. Your PDFs never leave your device.

Works on Office exports

PDFs exported from Microsoft Word and PowerPoint often carry significant structural overhead. This tool is particularly effective at shrinking them.

Frequently asked questions

Is my PDF uploaded to your servers?
No. Compression runs entirely inside your browser using the pdf-lib library. Your files never leave your device.
How much will my PDF be compressed?
Savings depend on the content. Text-heavy and Office-exported PDFs typically see 10–40% reduction. Image-heavy PDFs like scans may see minimal savings because the images are already compressed.
Will compression reduce the quality of my PDF?
No. This tool uses structural compression (object streams) which removes overhead without touching the visual content, text, images, and formatting stay unchanged.
Why did my file size not decrease?
Some PDFs are already well-optimised, or are dominated by large compressed images. Structural compression offers little further reduction in those cases.
Can I compress multiple PDFs at once?
Yes. Drop multiple PDFs in one go. Each is compressed independently and you can download them individually or all at once.
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