Make oversized PDFs small enough to actually send
Everyone has hit the wall: the upload form says “maximum 5 MB” and your scanned contract weighs 38 MB. Email gateways bounce anything over 20 MB, government portals are often stricter, and messaging apps recompress documents into unreadable mush. PDF bloat almost always comes from images — scans, photos and high-resolution graphics stored at print quality far beyond what a screen or office printer needs. This Compress PDF tool re-renders each page at a sensible resolution and stores it as an efficiently compressed image, routinely shrinking scanned documents by 60–90% — entirely on your own computer, with a live before/after size report.
How to compress a PDF
- Drop your PDF into the tool.
- Pick an image quality with the slider — 60% is a sweet spot for documents that must stay clearly readable.
- Click Compress PDF and watch the progress bar as pages are processed.
- The compressed file downloads automatically, and the status line shows exactly how much space you saved.
Choosing the right quality level
Compression is always a trade-off between size and fidelity. For text documents, contracts and forms, 50–65% quality typically looks indistinguishable on screen while cutting the file to a fraction of its size. For documents where photographs matter — brochures, portfolios, inspection reports — try 75–85%. If the first result is smaller than you need, simply run the tool again at a higher quality; because everything is local, experimenting costs you seconds, not upload time.
What this method does to your document
The tool renders each page to a high-resolution canvas and rebuilds the PDF from those rendered pages as JPEG images. This is the same approach “flatten and optimise” features use in professional software, and it is extremely effective on scans. The honest fine print: text becomes part of the page image, so it is no longer selectable or searchable in the output. For born-digital PDFs where you must keep live text, use the original for archiving and the compressed copy for sending.
Tips for maximum savings
- Scans compress spectacularly. A 300-dpi colour scan is mostly redundant data; 70–90% savings are normal.
- Already-optimised PDFs shrink less. If a file was exported “for web” it may only lose 10–20%.
- Check the result before deleting the original — keep the master at full quality and treat compressed copies as disposable.
- Combine with Split PDF if only part of the document needs to be sent: fewer pages, smaller file.
Next time a portal rejects your upload, you won't need to install anything or trust a stranger's server with your paperwork — the fix is one slider and one click away.
Quick reference
| Property | Detail |
|---|---|
| Input | One PDF file (scans compress best) |
| Method | Pages re-rendered as optimised JPEG images |
| Quality control | Slider 30–90% |
| Typical savings | 60–90% on scans, 10–40% on digital PDFs |
| Trade-off | Text becomes non-selectable (flattened) |
| Size report | Before → after shown instantly |
| Processing | 100% in-browser, no upload |
Frequently asked questions
How much smaller will my PDF get?
It depends on the source. Scanned documents and image-heavy files routinely shrink by 60–90%. PDFs that were already optimised for the web may only shed 10–20%. The tool shows the exact before/after sizes the moment compression finishes.
Will the text still be selectable after compression?
No — this method flattens each page into an image, which is what makes the dramatic savings possible. Keep the original for editing and searching, and use the compressed copy for sending and uploading.
Which quality setting should I choose?
For contracts, forms and text documents, 50–65% stays perfectly readable. For photo-heavy documents choose 75–85%. You can re-run the tool at different settings as many times as you like since nothing is uploaded.
Is there a file-size limit?
There is no artificial cap. Very large files (hundreds of pages of high-resolution scans) are limited only by your device's memory, and the progress bar keeps you informed throughout.