Compress PDF

Reduce PDF file size in your browser — choose a compression level and download a smaller file.

Works best on scanned or image-heavy PDFs. Everything runs in your browser.

How to use the Compress PDF

  1. Select a PDF. Choose the file you want to make smaller.
  2. Pick a level. Choose high quality, balanced, or strong compression.
  3. Compress & download. See the before/after size and your smaller PDF downloads automatically.

Why use our Compress PDF

Real size reduction. Re-renders pages at your chosen quality to genuinely shrink scanned and image-heavy PDFs.
You choose the trade-off. Pick high, balanced or strong compression to control quality vs. size.
Private & free. Compression runs in your browser — your file is never uploaded.

Free to use — premium coming soon

FREE
  • Three compression levels
  • Before/after size
  • No watermark
  • 100% private
PREMIUM
  • Remove ads
  • Batch compression
  • Target a specific file size

About the Compress PDF

Compress PDF reduces the file size of a PDF by re-rendering its pages at a quality level you choose, then re-saving them with stronger image compression. The biggest savings come from documents that are really pictures in disguise: scanned contracts, photographed receipts, or exported slides where each page is stored as a high-resolution bitmap. A single color page scanned at 300 DPI can run 8-10 MB, while a born-digital, text-based PDF is often under 100 KB per page. By stepping the image data down to a lower DPI and a JPEG quality of roughly 80-85%, the tool can trim image-heavy files by 70-90% with little visible loss.

Reach for this tool when a PDF won't attach to an email, uploads too slowly to a portal, or simply takes up more storage than it should. Most consumer mailboxes cap attachments around 20-25 MB, but Base64 encoding inflates files by about a third in transit, so a 20 MB PDF can arrive as roughly 27 MB and bounce. Compressing first keeps you safely under the limit. It is also worth doing before posting documents to job applications, government forms, or shared drives where an upload size cap is common and a 50 MB scan is unwelcome.

Under the hood, the tool draws each page onto a canvas at a target resolution, then encodes the result as a compressed image and rebuilds the PDF around those pages. Lowering the quality slider shrinks the canvas DPI and tightens JPEG compression, which is exactly where most of a scanned file's weight lives. A medium or 'good' setting is the safe default for everyday documents; a low setting maximizes shrinkage when only legibility matters. Because pages are rasterized, very fine text or thin lines can soften, so preview the output before sending anything where sharpness is critical.

Everything happens in your browser. The PDF is read, re-rendered, and re-saved on your own device, so the file is never uploaded to a server and nothing is stored or logged after you close the tab. That matters for the documents people most often need to compress: tax forms, medical records, signed agreements, and ID scans. One trade-off to know: re-rendering pages converts selectable text into an image, so the compressed copy will not be searchable or copy-pasteable. Keep your original if you still need editable, selectable text, and use the compressed version for sharing or archiving.

Frequently asked questions

Will compressing my PDF make the text blurry?

It can, because this tool re-renders each page as an image at a chosen resolution. At a medium or 'good' quality level most text stays crisp on screen; at the lowest setting fine print and thin lines may soften. Preview the result and step the quality up one level if the text looks rough.

How much smaller will my PDF get?

It depends almost entirely on what's inside. Scanned or image-heavy PDFs commonly shrink 70-90% because their bulk is high-resolution pictures. A PDF that is mostly plain digital text is already small and may barely change, since there isn't much image data to compress.

Is my file uploaded to a server?

No. The compression runs entirely in your browser on your device, so the PDF never leaves your computer and nothing is stored after you close the page. That keeps sensitive documents like tax forms and ID scans private.

Why is my PDF so large in the first place?

Usually it contains high-resolution images, scanned pages saved without compression, or fully embedded fonts. Scanners are the most common culprit: they capture each page as a detailed photo, so a color scan at 300 DPI can be several megabytes per page.

Will I still be able to select or search the text after compressing?

No. Because pages are rasterized into images, the compressed PDF's text becomes part of the picture and is no longer selectable, searchable, or copy-pasteable. Keep your original file if you need editable text, and use the compressed copy for sharing or storage.

From our blog

PDF to Word: How Conversion Actually Works and How to Get a Clean .docx

By the Super Simple Digital Tools Team · Updated June 2026

People reach for a PDF to Word converter for one reason: they need to edit a document that arrived locked in a format designed not to be edited. A PDF is essentially a finished page. It records where every character, line, and image sits, embeds the fonts it needs, and guarantees the page looks the same on any screen or printer. That stability is exactly what makes editing hard, because Word does the opposite job: it stores reflowable paragraphs, styles, and tables that move and rewrap as you type. Conversion is the bridge between these two philosophies, and understanding the gap explains why results vary.

The single biggest factor in your result is whether the PDF is text-based or scanned. A text-based (or 'born-digital') PDF was created by software such as Word, Google Docs, or a print-to-PDF command, and it carries a hidden, selectable text layer. If you can highlight and copy text in your PDF viewer, you have this type, and conversion is largely a matter of reading that layer and re-mapping it into Word paragraphs and tables. A scanned PDF is a different animal: it is just an image of a page, so there is no text to extract until OCR software examines the picture and recognises the shapes of the letters.

OCR is powerful but not magic, and its accuracy is set mostly by the quality of the source scan. Clean, high-contrast pages scanned straight and at roughly 300 DPI convert far more reliably than dim, skewed, or low-resolution images. Decorative fonts, faint print, handwriting, and busy backgrounds all increase the error rate. Before converting a scan, it is worth straightening crooked pages, cropping away dark borders, and rescanning anything blurry, because every improvement to the image directly improves the editable text you get back at the end.

Even with a perfect source, expect some formatting drift, especially in complex documents. Multi-column newsletters, dense financial tables, text boxes, and pages that mix images with wrapped text are the hardest to rebuild because Word has to guess the intended structure. Typical symptoms are words running together without spaces, tables splitting into loose cells, images landing in the wrong place, and fonts substituting for ones Word does not have. None of these mean the conversion failed; they are the natural cost of moving from a fixed layout to an editable one, and they are quick to tidy by hand.

The smart workflow, then, is convert first, proofread second. Open the .docx, skim from top to bottom, and fix spacing, headings, and any table that came apart, paying extra attention to numbers and names if OCR was involved. Keep the original PDF until you have confirmed the Word copy is correct. And match the tool to the document's sensitivity: for everyday text-based PDFs, an in-browser conversion that never uploads your file is both fast and private, while confidential contracts or financial records deserve either local processing or a service with clear encryption and automatic file deletion.

  • Check whether your PDF is text-based by trying to highlight and copy a sentence in any viewer; if you can, conversion will be cleaner and may avoid OCR entirely.
  • For scanned documents, rescan at around 300 DPI and straighten or crop the pages first, since OCR accuracy depends almost entirely on a clear, upright image.
  • After converting, review tables, columns, and spacing immediately, as these are the elements most likely to shift when a fixed PDF layout becomes editable Word content.
  • For confidential files, favour in-browser conversion that keeps the document on your device, or a server tool that encrypts uploads and deletes files automatically after download.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.

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