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Reduce file size without losing quality.
Choose exactly how much you want to shrink your PDF – by 30%, 50%, 70%, or any percentage you need. Perfect for fine‑tuning file size without guessing. No sign-up, no software – just upload, set your percentage, and download.
Did you know? Instead of aiming for a specific size, percentage‑based compression lets you reduce files proportionally – so you always get a predictable reduction, regardless of the original file size.
Not all files need to be squeezed to a fixed size. Sometimes you just want to reduce the file by a certain percentage to save space or meet a loose limit.
Here's why percentage compression is so useful:
Instead of guessing a target size, you simply say "reduce by 40%" – the tool handles the rest, adapting to your specific file.
When you have multiple files, applying the same percentage gives you a uniform reduction across all of them, making archiving and sharing consistent.
With exact‑size compression, you might overshoot and lose quality. Percentage compression lets you choose a moderate reduction, preserving quality while saving space.
Percentages are intuitive – everyone understands what "reduce by half" means. No need to calculate target sizes.
Here’s a visual guide to what different reduction percentages mean for various content types:
The actual resulting size depends on the content, but the percentage reduction is applied consistently.
To achieve a specific percentage reduction, our tool uses an intelligent, adaptive process:
The result is a PDF that is exactly the percentage smaller you asked for – with the best possible quality for that reduction level.
Follow these simple steps to reduce your PDF by any percentage:
DonePDF Compress PDF and upload your file.
Enter the percentage reduction you want (e.g., 40%).
Click "Compress by Percentage" – processing takes a few seconds.
Download your reduced PDF – it will be exactly the percentage smaller you requested.
For very high percentages (80%+), we recommend using Hyper Compress for better results.
Our tool offers three base compression modes. Here's the typical percentage reduction you can expect from each:
With our percentage‑based tool, you can request any percentage within these ranges – we will automatically choose the right intensity.
Alternatives you might consider:
Our tool gives you precise percentage control – no guesswork, no trial‑and‑error.
Pro Tip: For emails, 30‑40% reduction often makes a file small enough to send without losing quality. For archiving, 50‑60% is a sweet spot.
Choose any percentage – 10%, 47%, 83% – you are in full control.
Apply the same percentage to different files and get consistent reduction.
No over‑compression – you decide how much to sacrifice.
Percentages are easy to understand – no calculations needed.
🚀 Need more than 80% reduction? Try Hyper Compress
If you need to reduce by 80‑90%, Hyper Compress applies extreme image compression and grayscale conversion to achieve that, even for image‑heavy files.
You upload your PDF and choose a percentage reduction (e.g., 40%). Our tool then applies compression techniques – image downsampling, JPEG quality adjustment, metadata stripping, and font subsetting – to reduce the file size by that exact percentage, while preserving as much quality as possible.
It depends on your needs. For email attachments, 30‑50% is usually enough. For web uploads or storage savings, 60‑70% works well. For extreme reduction (e.g., 80‑90%), quality will decrease significantly – consider using our Hyper Compress tool.
Yes, the higher the percentage, the more quality is reduced – especially for images. Text usually remains readable even at high percentages. We recommend previewing the result before downloading.
No, 100% reduction would mean an empty file. The tool typically works up to 90‑95% reduction, but beyond 80% quality becomes very poor. For extreme cases, use Hyper Compress.
Absolutely. We use TLS encryption and auto-delete all files within 2 hours. Your privacy is protected.
Our tool works with any PDF – text, images, or scanned. The compression algorithm adapts to the content to achieve the requested percentage.
Typically 30‑60 seconds. The tool may run multiple passes to hit the exact percentage, but it's usually fast.
Upload your PDF, choose your reduction percentage, and download a perfectly sized file – fast, secure, and easy.
Reaching a strict file size target requires a combination of techniques: aggressive image downsampling, metadata removal, font subsetting, and efficient stream compression. Our tool automates these processes to help you achieve your target quickly.
Our tool lets you choose compression levels that correspond to specific percentage reductions. Adjust the slider to see the estimated file size in real time, allowing you to balance quality and size precisely.
If you cannot reach your target without unacceptable quality loss, consider splitting the PDF into multiple files or using our Hyper Compress tool for extreme reduction. For text‑only documents, quality loss is minimal even at maximum compression.
Explore the full collection of tools in the PDF Size Problems.