Compress PDF

Reduce file size instantly — quality, layout and text preserved. Compress up to 3 files at once.

Drag & drop your PDF files here
Up to 3 files  •  15 MB total
🔒 No files stored
⚡ Done in seconds
✓ Free forever
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Frequently Asked Questions

What does this PDF compressor do?

Convixy's PDF compressor reduces the file size of your PDF documents instantly, right from your browser. There is no software to install, no account to create, and no technical knowledge required. Upload your PDF and the compressed version is ready within seconds, complete with an exact before-and-after size comparison so you know precisely how much was saved. The tool works on every device and operating system including Windows, macOS, Android, and iOS. You can compress up to three files at once, with a combined total size of up to 15 MB. Multiple files are automatically packaged into a single ZIP download for convenience, with individual download links available for each file. For documents that still need to be created first, the Word to PDF and Excel to PDF converters are a natural starting point before compressing.

Why compress a PDF?

PDF files accumulate size quickly — especially those produced from presentations, scanned pages, or design software with embedded photographs. A large PDF creates real, everyday problems: email providers like Gmail and Outlook enforce attachment size limits, government and HR portals cap uploads at 5 MB or 10 MB, and large files load slowly on mobile connections. Compressing your PDF solves all of these at once. You get a smaller, faster, more shareable file without redoing any of the original work. Once compressed, you can combine multiple compressed PDFs into one using Merge PDF, or extract specific pages with Split PDF.

Can I compress multiple PDF files at once?

Yes. You can upload and compress up to three PDF files in a single session. The combined size of all uploaded files must not exceed 15 MB. When you compress two or three files together, all results are bundled automatically into a single ZIP file for one-click download, with individual download links and a per-file size summary shown below the main button. This batch capability is especially useful when processing a set of scanned invoices, monthly reports, or contract copies that all need to be reduced before archiving or uploading to a portal.

What is the file size limit?

The total upload size across all files in a single session is 15 MB. For a single file this means up to 15 MB; for two or three files combined, the sum must stay under 15 MB. If your original file is already large, the most effective approach before uploading is to return to the source document and reduce image resolution there first. In Microsoft Word, go to File → Compress Pictures and choose a lower DPI, then re-export using the Word to PDF tool and compress the result here for maximum reduction.

How much will my file shrink?

The reduction depends entirely on what the PDF contains. Files with many high-resolution photographs or scanned pages typically see the most dramatic savings — often 60% to 85% smaller. PDFs that are already well-optimised, or those consisting mostly of text and simple vector graphics, typically see 10% to 30% reduction. After every compression, Convixy displays the exact original size, the new compressed size, and the percentage saved per file — so you always know precisely what changed. If results are more modest than expected, the file may already be well-optimised, or the images may already be at a low resolution.

Will compression affect the quality of my document?

Text, vector graphics, fonts, and document structure are completely unaffected by compression and remain perfectly sharp at any zoom level. Images are resampled to 72 DPI — the standard resolution for on-screen digital viewing — which is more than sufficient for contracts, reports, invoices, presentations, and correspondence. The one scenario where quality is worth checking is a PDF containing photographs specifically intended for large-format professional printing, where very high image resolution matters. For all everyday digital uses, the visual difference between the original and the compressed version is imperceptible.

What types of PDF files compress best?

The largest reductions come from PDFs with substantial embedded raster image content:

Text-only PDFs — such as plain word-processed documents, legal contracts, or technical specifications — compress less dramatically since they contain little raster image data, but the process still removes internal structural overhead and is always worthwhile.

What technology powers the compression?

The compression is handled by Ghostscript, an open-source PostScript and PDF interpreter maintained since 1988 and widely used in enterprise and government environments for reliable server-side PDF processing. Files are processed with the -dPDFSETTINGS=/screen optimisation profile and -dCompatibilityLevel=1.4 compatibility flag. Ghostscript resamples raster images to 72 DPI, applies efficient JPEG compression to image streams, subsets embedded fonts to include only the characters used in the document, removes unreferenced internal data objects, and writes a clean, optimised PDF 1.4-compatible output file. The process is lossless for all text and vector content.

Can I compress a password-protected PDF?

PDFs that require a password to open cannot be processed, because the compression engine needs full read access to the document's content to re-render it. If you need to compress a password-protected file, remove the password protection in your original PDF software first, then upload the unlocked file here. PDFs with owner-level restrictions (which limit printing or editing but do not require a password to open) can usually be processed without any issue.

Is my file safe and private?

Privacy is built into every step. Your files are transferred over an encrypted TLS connection — the same standard used by banks and financial institutions. Once your compressed PDF is ready and downloaded, both the uploaded original and the compressed output are automatically and permanently deleted from our servers. We do not read, index, store, or share your document content. Since no account or login is required, there is no user profile linked to your files. Everything stays between you and your browser from upload to download.

Do I need to install any software?

Nothing to install, nothing to configure. Convixy runs entirely in your browser across Windows, macOS, Linux, Android, and iOS. There is no desktop application, no browser extension, and no requirement for Adobe Acrobat or any other local software. Open the page, upload your PDF, and download the compressed result — the entire process takes seconds.

What to do after compressing your PDF

Once you have a smaller PDF, Convixy has all the tools you need to manage it further. To combine multiple compressed PDFs into a single document, use Merge PDF. To extract only the pages you need from a larger file, use Split PDF. If you are starting from a Word, Excel, or PowerPoint file, convert it first with Word to PDF, Excel to PDF, or PowerPoint to PDF — then compress the result here for the smallest possible output. For images, use Image to PDF to convert JPG or PNG files first.

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