What is Compress PDF and how does it work?

Compress PDF reduces the file size of a PDF so it's easier to email, upload or store. Most of the weight in a PDF comes from oversized images, so that's where the savings are found — the text itself is left alone.

How do I use Compress PDF online?

Upload your file using the box above — drag it in, browse for it, or bring it in from your cloud storage. A preview appears so you can check you've picked the right file. Run Compress PDF, then download the result. You can rename it before you save it.

Is my file secure when I use Compress PDF?

Yes. The file you send to Compress PDF travels over an encrypted HTTPS connection and is processed automatically on our servers. It is never made public, never shared with anyone, and nobody reads it.

Does HuntPDF store my files after Compress PDF has run?

No. Your upload is deleted the moment Compress PDF finishes with it, and the file it produces is removed as soon as you have downloaded it, or when you upload another file, or when you close the page. Nothing is kept, and nothing is used to train anything.

Will the original quality and formatting be maintained?

Text stays perfectly sharp, because it's stored as vectors rather than pixels. Images are where the size is saved, and the default setting is tuned so the difference isn't visible on screen or in print.

Can I use Compress PDF on mobile?

Yes. Compress PDF works in any modern browser on phones and tablets — iPhone, iPad or Android — with nothing to install. You can upload straight from your device or from your cloud storage.

Can I rename my file before downloading it from Compress PDF?

Yes. The file Compress PDF gives you back keeps the name of the file you uploaded by default. If you'd rather call it something else, edit the name in the field next to the download button before you save it.

Do I need to install any software to use Compress PDF?

No. There is nothing to download, install or sign up for — Compress PDF is used from your browser and does the work on our servers, so it behaves the same on Windows, macOS, Linux, Android and iOS.

How long does Compress PDF take?

Most files are finished in a few seconds. A large or page-heavy file takes a little longer, because Compress PDF runs on our servers rather than on your device — but you won't be waiting around. You can upload files up to 250MB.

Is Compress PDF free to use?

Yes. Compress PDF is free, with no signup, no watermark on the result and no daily limit for normal use.

What does Compress PDF do?

It re-saves the images inside your PDF at a lower resolution and tidies the file structure, so the same document takes up less space.

Will Compress PDF reduce the quality of my document?

Text stays as sharp text. Images are resampled to 150 dpi on Recommended, which looks clean on screen and in normal printing.

Which compression level should I use?

Recommended for most files, Extreme for strict upload limits, and Light when the PDF will be printed.

Can I compress several PDFs at once?

Yes. Add them together and each is compressed with the same setting, with a download for every file.

Why didn't my PDF get smaller?

It was already optimised or mostly text. When compressing would only make it worse, the tool keeps your original.

How do I reduce PDF size for a 2 MB upload limit?

Try Recommended first. If it's still too big, go back and choose Extreme, or remove pages you don't need with Delete PDF Pages.

Can I compress a PDF more than once?

You can, but a second pass saves little and softens images. Compress once from the original, at a stronger level if needed.

Compress PDF Online – Free, No Watermark, No Signup

Drop your file on the target

Several files · up to 260 MB each · deleted after processing

Drop your files here

Choose files

Several PDFs at once
Never bigger than the original
Up to 260 MB per file

Processed on our secure servers over HTTPS. Your files are deleted automatically after processing.

Compress PDF reduces PDF size so a scanned application fits under a portal's upload limit, or a photo-heavy brochure gets past a 25 MB email cap. Pick how much to compress, and compress several PDFs at once if you need to.

How to use Compress PDF

Drop your PDF on the page or choose it from Google Drive, Dropbox or OneDrive. Add more files if you have a batch. Pick a level: Recommended (small and sharp, images at 150 dpi), Extreme (smallest, 72 dpi) or Light (best quality, 300 dpi). Press Compress PDF. You'll see the old and new size and the percentage saved. Download the file, rename it, send it on WhatsApp, or press 'Continue with this file' to merge or sign it.

Who needs to reduce PDF size

A visa applicant gets a scanned bank statement under a 2 MB upload limit. A marketing team shrinks a 40 MB brochure so it can go out by email. A student under a 10 MB coursework portal limit compresses a report full of screenshots. An accounts clerk makes a year of scanned receipts easier to store.

How much smaller will my PDF get?

It depends on what's inside. Scanned pages and photos are where the size lives, so a scanned PDF often shrinks by half or more, and the tool flags scans when you add them. A text-only PDF is already compact and won't shrink much.

If a file is already small, under about 300 kB, you'll get a note that there may be little to save. And if a PDF can't get smaller without losing quality, the original is kept rather than handing you a worse copy.

Choosing a Compress PDF level

Recommended suits almost everything you send by email or upload to a form. Use Extreme when a portal has a strict limit and the document only needs to be readable on screen. Use Light for anything that will be printed, such as a brochure or a thesis.

For print or long-term records, keep an uncompressed master copy and compress a separate version for sharing.

Frequently asked questions

What does Compress PDF do?: It re-saves the images inside your PDF at a lower resolution and tidies the file structure, so the same document takes up less space.
Will Compress PDF reduce the quality of my document?: Text stays as sharp text. Images are resampled to 150 dpi on Recommended, which looks clean on screen and in normal printing.
Which compression level should I use?: Recommended for most files, Extreme for strict upload limits, and Light when the PDF will be printed.
Can I compress several PDFs at once?: Yes. Add them together and each is compressed with the same setting, with a download for every file.
Why didn't my PDF get smaller?: It was already optimised or mostly text. When compressing would only make it worse, the tool keeps your original.
How do I reduce PDF size for a 2 MB upload limit?: Try Recommended first. If it's still too big, go back and choose Extreme, or remove pages you don't need with Delete PDF Pages.
Can I compress a PDF more than once?: You can, but a second pass saves little and softens images. Compress once from the original, at a stronger level if needed.