Compress PDF
Reduce PDF size locally. Raster mode re-renders pages; lossless mode keeps text and re-packs the file.
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About this tool
Compress a PDF to 100KB
Need a PDF under 100KB for an upload form? Use target-size mode and we will lower quality and resolution until it fits.
All compression runs locally, so confidential documents never leave your device.
Compress a PDF to 200KB
Hit a 200KB limit for a portal or form by entering 200 as your target size.
Compression is local and private, with no watermark added.
Compress a PDF to 500KB
Reduce a bulky PDF to around 500KB for email or web upload.
Set 500 as the target and download a slimmed-down file in seconds.
Frequently asked questions
How does target size work?
The engine re-renders pages and steps down quality/resolution until the file is at or below your target.
Will it always hit exactly 100KB?
It gets as close as possible at or below the target; image-light PDFs may already be smaller.
Is quality preserved?
Target-size mode balances quality against the limit; pick a higher target for better quality.
Is it private?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
What gets compressed?
Pages are rasterized and re-encoded as JPEG at a quality/scale chosen to meet your target.
Are files uploaded?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Best for which PDFs?
Compression helps most with scanned or image-heavy PDFs.
What size should I target?
Most email providers allow 10-25MB; targeting a few MB is usually safe.
Will text stay readable at 25KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 50KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 75KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 150KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 250KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 300KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 400KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 600KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 750KB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 1.5MB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 2MB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 3MB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 4MB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 5MB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
Will text stay readable at 10MB?
Smart mode recompresses only the embedded images, so text and vector graphics stay sharp.
What size should I target for email?
Most providers allow 10-25MB. Target 5-8MB to be safe across Gmail, Outlook, and Yahoo.
Is this secure for legal documents?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Will text stay readable?
Smart compression only reduces embedded image quality while keeping text and vector graphics crisp.
What is WhatsApp file size limit?
WhatsApp allows files up to 100MB on most platforms, but smaller files send much faster on mobile data.
Will my resume formatting be preserved?
Yes - text and vector graphics stay crisp. Only embedded images are recompressed.
Does this work on iPhone?
Yes - KuroPDF works in any modern browser on iPhone. No app download required.
Does this work on Android?
Yes - KuroPDF works in any modern browser on Android. No app download required.
Does this work on Mac?
Yes - KuroPDF works in any modern browser on Mac. No app download required.
Does this work on Chromebook?
Yes - KuroPDF works in any modern browser on Chromebook. No app download required.
Does this work on iPad?
Yes - KuroPDF works in any modern browser on iPad. No app download required.
Does this work on Windows?
Yes - KuroPDF works in any modern browser on Windows. No app download required.
How do I compress a PDF?
Open the tool, drop your file, adjust any settings, and click the action button. The result downloads to your device instantly.
Do I need to create an account?
No - KuroPDF is completely free with no sign-up required.
Are my files uploaded?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
How do I reduce PDF file size?
Open the tool, drop your file, adjust any settings, and click the action button. The result downloads to your device instantly.