Compress PDF to 500KB
Free, private, in-browser. No upload, no sign-up, no watermark.
Need a different size?
Files are processed in your browser and never uploaded.
Plenty of online forms, school portals, and application systems accept files only up to 500KB. This tool brings your PDF under that limit while preserving as much clarity as possible. It runs entirely in your browser — your file is never uploaded — and targets 500KB precisely instead of guessing with a generic "low/medium/high" setting. The extra headroom compared to 100KB or 200KB limits means photos, charts, and scanned pages keep noticeably more detail, which is helpful when a reviewer actually needs to read the fine print. You can drop in a single document or a longer report, and the tool spreads the size budget across every page so the whole file lands just under the cap. There is no sign-up, no daily quota, and no watermark, and your original file stays private on your own device throughout.
How it works
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Select your PDF
Choose the file you want to shrink. It loads directly in your browser.
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Compress in-browser
We lower image resolution and quality until it hits the target size.
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Download the result
Save the smaller PDF. Nothing is ever uploaded to a server.
FAQ
Will 500KB keep more quality than 100KB?
Yes. A higher target allows higher image quality, so 500KB output looks noticeably sharper than 100KB.
Does this work on mobile?
Yes, on modern mobile browsers. Very large files may be limited by phone memory.
Are there usage limits?
No. There is no daily cap, no login, and no watermark.
Learn more: How to compress a PDF for an online form