Compress PDF Files Online

Drop one or more files into the tool above, choose a compression level (Low, Medium, or Maximum), and click Compress. Each file is processed in turn, then you can download them individually or all together as a ZIP — no signup and no daily cap.

Yes. Add up to 20 files in a single batch and the tool compresses them one at a time, showing live progress and the size saved for each. When it finishes, download each file on its own or grab the whole set as a single ZIP.

PDFs and images (JPG, PNG, WebP), plus Word (DOC/DOCX), Excel (XLS/XLSX), and PowerPoint (PPT/PPTX) documents. Images and Office files are converted to PDF first, then compressed like any other PDF.

Yes. Your file is uploaded over an encrypted HTTPS connection, compressed on our server, streamed straight back to you, and deleted immediately — we never store, log, or read your files. A background sweep guarantees nothing survives past two hours even if a request fails. There are no watermarks and no accounts.

It depends on the document and the level you choose. Image-heavy and scanned PDFs shrink the most — often 50–80% on Maximum. PDFs that are already optimized may shrink only a little; the tool tells you the exact percentage saved after compressing.

No. We never add a watermark, badge, or stamp to your output. The compressed file is clean.

Low keeps the highest visual quality with a modest size reduction — best for documents you will print. Medium balances quality and size for everyday email and uploads. Maximum applies the strongest compression for the smallest possible file.

Yes. Unlike compressors that flatten each page into an image, we use Ghostscript, which keeps your text as real, selectable, searchable text and only downsamples the images. Your compressed PDF stays a proper document — you can still select, copy, and search the text.

No. If a PDF is already fully optimized and compression would not help, the tool detects this and simply returns your original file unchanged rather than a larger one — so you never end up with a bigger file than you started with.

Each file can be up to 90 MB, with up to 20 files per batch (Word/Excel/PowerPoint files are capped at 25 MB for the conversion step). If you have a larger file, split it first with our Split PDF tool, then compress the pieces.

Yes. The compressor runs in any modern browser on iPhone, iPad, Android, Windows, Mac, and Linux — no app to install and no account to create.

Choose the Low level (300 dpi). It strips redundant data and lightly optimizes images while keeping pages crisp enough to print, so the drop in visual quality is negligible. Because we use Ghostscript, your text always stays sharp, selectable, and searchable at every level — only images are downsampled — so a document never turns into a blurry picture the way image-based compressors do.

Most mail providers cap attachments at 20–25 MB (Gmail is 25 MB, Outlook 20 MB), and many contact forms are stricter at 5–10 MB. Pick the Medium level for the best balance of size and clarity — it clears the email limit for the vast majority of documents. If your file is still too large, switch to Maximum, or compress and attach the pages you actually need.

Pick the level that matches your target: Maximum (72 dpi) gets most text PDFs and single scans well under 100–300 KB, Medium lands most everyday files around 500 KB–2 MB, and Low keeps larger files near print quality. Compress once, check the exact new size shown in the before/after panel, and step up to a stronger level if you still need it smaller. For very large multi-page scans, split the file first, then compress the parts.

Almost always because of images. Scanned pages, photos, and screenshots are stored at full camera or scanner resolution — far higher than a screen or printer needs — and a handful of them can balloon a PDF to tens of megabytes. Embedded fonts, thumbnails, and saved edit history add more. Compression downsamples those images to a sensible resolution and strips the extra data, which is why image-heavy PDFs shrink the most.

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