Glarso

Compress PDF

Shrink PDF file size by re-compressing pages, with a live quality preview.

Drag & drop files here, or click to browse

One PDF — pages are re-compressed

Files never leave your device

Shrink a PDF before sharing it

Email attachment limits, upload forms, and slow connections all hate large PDFs. Drop your file above, pick a resolution and quality level, and download a smaller version — with a live before/after size comparison.

Need to edit pages instead of shrinking them? Try Delete & Reorder PDF Pages.

Frequently asked questions

Is my PDF uploaded to compress it?

No. Every page is re-rendered and re-compressed by a PDF engine running in your browser, so the file never leaves your device.

How does this shrink the file?

Each page is re-rendered as a JPEG at your chosen resolution and quality, then repacked into a new PDF — the same idea printers use for 'print to PDF'. It works especially well on scanned documents and image-heavy PDFs.

Will the text still be selectable?

No — pages are converted to images, so text becomes part of the picture and is no longer selectable or searchable. If you need to keep selectable text, don't compress; just share the original.

What settings should I use?

Medium resolution with 60% quality is a good default for sharing over email. Drop to Low resolution for maximum shrinkage, or use High resolution if the PDF will be printed.

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