Compress PDF

The engine re-renders pages and steps down quality/resolution until the file is at or below your target.

It gets as close as possible at or below the target; image-light PDFs may already be smaller.

Target-size mode balances quality against the limit; pick a higher target for better quality.

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.

Pages are rasterized and re-encoded as JPEG at a quality/scale chosen to meet your target.

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.

Compression helps most with scanned or image-heavy PDFs.

Most email providers allow 10-25MB; targeting a few MB is usually safe.

It depends on the content. Scanned documents (page-sized images) compress dramatically — often 80-90% reduction. Text-heavy PDFs with few images may only shrink 10-20% because text is already tiny.

Yes. The engine only recompresses embedded images. Text, vector graphics, annotations, and form fields are preserved as-is.

Quality mode applies a fixed compression level to all images — simple and fast. Target-size mode iterates, testing different quality levels until the output hits your specified size — slower but guarantees the result fits.

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.

Text in a PDF is already extremely compact (just character codes and positions). If your PDF has no embedded images, there is very little that lossy compression can do. Try the Optimize PDF tool instead for lossless structural cleanup.

Yes, but there are tradeoffs. A heavily scanned document at target 1MB will show visible compression artifacts. Set the target as high as your use case allows for better legibility.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 25KB, no compression is applied. You will get the original file back unchanged.

The engine iteratively adjusts image quality and resolution of embedded images, testing the output size after each step, until the result is at or below your 25KB target.

Currently the tool processes one PDF at a time, but you can quickly drop another file after the first finishes.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 50KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 75KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 150KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 250KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 300KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 400KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 600KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 750KB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 1.5MB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 2MB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 3MB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 4MB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 5MB, no compression is applied. You will get the original file back unchanged.

Yes — the compressor targets embedded images specifically. Text and vector graphics (charts, logos, line art) remain perfectly sharp and selectable.

If your PDF is already smaller than 10MB, no compression is applied. You will get the original file back unchanged.

For maximum compatibility across Gmail, Outlook, Yahoo, and corporate mail servers: target 8-10MB. Gmail and Yahoo allow up to 25MB, Outlook up to 20MB, but many corporate servers cap at 10MB. Going smaller guarantees delivery.

For documents with text and a few images, you will rarely notice any difference. The engine only recompresses embedded images — text, charts, and vector graphics remain perfectly crisp. Heavily image-based PDFs (photo albums, scanned documents) show more visible compression, but remain readable.

Scanned PDFs are essentially page-sized images, so they compress aggressively. A 50MB scan can often reach 5MB with acceptable quality. Set a comfortable target and preview the result.

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.

Yes. The compression engine only targets embedded raster images (scans, photos). Text overlays, vector stamps, and Bates numbering remain pixel-perfect because they are preserved as vector data.

Federal courts (CM/ECF): 25MB per document, 50MB total. Most state courts: 10-25MB per filing. Appellate courts vary but typically 25-50MB. Always verify with your specific court clerk.

If your source document is PDF/A (as required by some courts), the compressed output maintains the same structure. However, image recompression changes embedded image data, which may technically break strict PDF/A validation. For archival-critical filings, test the output with a PDF/A validator.

Process one document at a time. For multi-document filings, compress each exhibit package separately to ensure each stays under the per-document limit.

WhatsApp allows files up to 100MB on most platforms, but smaller files send much faster on mobile data.

Yes — text, fonts, layout, and vector graphics remain pixel-perfect. Only embedded images (headshot, portfolio thumbnails) are recompressed to reduce file size.

Workday: 5MB. Taleo: 2-5MB depending on employer settings. Greenhouse: 5MB. Lever: 5MB. LinkedIn Easy Apply: 2MB. When in doubt, target 1-2MB to be safe everywhere.

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.

Yes. Fonts are embedded as vector data in the PDF and are not affected by image compression. Your typography choices stay exactly as designed.

Text-only PDFs are usually small already. If yours is large, it might have unnecessarily embedded full font families. Try the Optimize PDF tool for lossless structural cleanup that removes unused font subsets.

Yes - KuroPDF works in any modern browser on iPhone. No app download required.

Yes - KuroPDF works in any modern browser on Android. No app download required.

Yes - KuroPDF works in any modern browser on Mac. No app download required.

Yes - KuroPDF works in any modern browser on Chromebook. No app download required.

Yes - KuroPDF works in any modern browser on iPad. No app download required.

Yes - KuroPDF works in any modern browser on Windows. No app download required.

Open the tool, drop your file, adjust any settings, and click the action button. The result downloads to your device instantly.

No - KuroPDF is completely free with no sign-up required.

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.