PDF Compressor
Shrink large PDFs locally with a quality slider before email or upload.
Drop a PDF to compress
Pages are re-encoded as JPEG locally
No server upload — processed on your device
Computer · URL · cloud · drag & drop
PDF Compressor by format
How to use this tool
Pick a format tool
Open a format-specific page below (for example PDF File Compressor) when you know the extension, or use the general pdf compressor on this page.
Add your file
Drop a file up to 100 MB. Compression stays in this tab — no third-party conversion queue.
Download the smaller file
Tune quality, then save the result locally when the size looks right.
Frequently Asked Questions
More on quality loss: conversion quality guides · compression guides
Is the pdf compressor free?
Yes. Format Convertly compresses files in your browser with no signup or watermark.
Do you upload my files?
No. Compression runs on your device. There is no server copy of your files.
Why are there format-specific pages?
Each tool accepts the right extensions and sets a sensible output — for example PDF File Compressor.
Does compressing a PDF reduce quality?
It can — page images are re-encoded for size. Use a higher quality setting for print-critical documents and keep the original master.
Can you recover quality after compressing a PDF?
Not from the compressed file alone. Keep the original PDF if you still need selectable text or full fidelity.
How do I reduce PDF size?
Use the PDF Compressor with a quality slider for image-heavy scans. Read the How to reduce PDF size guide for when text stays selectable and when to keep a master.
Is PDF compression lossy?
Often yes when pages are re-encoded as images. See Lossy vs lossless compression and Why compressed files lose quality.
Where can I learn more about compression?
Browse Format Convertly’s Compression guides — what compression is, lossy vs lossless, image/video/audio how-tos, bitrate, and PDF size tips — each links back to the matching compressor.
Ready to convert more formats?
Browse converters or jump back to the tool above.