How much can I reduce the file size?

It depends on the content. Image-heavy PDFs and high-resolution photos can often be reduced by 50-80%. Text-only PDFs with minimal images may see smaller reductions. Use the quality slider to balance size and visual quality.

Does compressing a PDF reduce its quality?

Compression works by re-encoding embedded images at a lower quality. Text, vector graphics, and document structure are not affected. For most business documents, a quality setting of 70-80% produces output that looks identical on screen.

Is my file uploaded to a server during compression?

No. All compression happens locally in your browser. Your file is never transmitted to any server and is discarded as soon as you close or refresh the tab.

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Signvert/ Resize & Compress

compressFree · No account · 100% browser

Resize & Compress Files

Reduce the file size of images (JPG, PNG) and PDFs. Control quality and dimensions. Nothing is uploaded anywhere.

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JPG, PNG, WebP, or PDF

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100% Private

Your files never leave your browser.

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Full Control

Adjust quality and dimensions yourself.

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Instant

No upload queue. Results in seconds.

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How it works

Signvert's compress PDF online free tool reduces the file size of PDFs and images directly in your browser, with no server upload required. For images, you can adjust the output quality and maximum dimensions using simple sliders and see the estimated file size before downloading. For PDFs, the tool re-encodes embedded images at a lower quality to shrink the overall file size. The entire compression process runs locally using open-source libraries, keeping your documents completely private.

Frequently asked questions

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