Compress PDF to 350kB

No. A result just under 350 kB is still larger than 300 kB and will fail a strict check. Use the 300 kB preset, or a slightly lower custom target, whenever the field names 300 kB as its maximum.

About five to ten clean pages, especially in black & white. More pages can fit if they came directly from a word processor, while photographs and coloured scans need more bytes per page.

Yes. It sits well above the minimum and roughly 150 kB below the maximum, leaving room for different kilobyte calculations. Always verify the active portal because field limits can change between admission cycles.

Usually, if it was exported digitally and the lossless pass reaches the target. When a PDF must be re-rendered, pages become images and the text layer is flattened; the result card tells you which method ran.

Photographs, gradients and camera noise need far more information than plain text. With many such pages, the minimum useful image data plus PDF overhead can exceed the target; split the file, enable grayscale or use a larger limit.

Mb2KbSizer shrinks images and PDF documents to a size you choose, free of charge, without leaving your browser. Give the PDF compressor a file of up to 100 MB, enter a target in kB, MB or as a percentage of the original, and it works to bring the document under that figure. Typical jobs include getting a scanned marksheet below a portal's cap, squeezing a multi-page application form into an email, or lightening a report before sharing it. The same site offers an [image compressor](/) and a bulk image compressor, both built on the same no-upload approach.

It is, with no catches. You will not meet a paywall after the first file, a cap on pages, a size restriction beyond the 100 MB input limit, or a stamp on the output. We do not ask for an email address or an account. Ads on the page cover our hosting bill, and since your device does the processing, we have no per-file costs to pass on. Whether you compress one certificate or every document for a job application, the price is the same: nothing. There is no paid plan waiting behind the free one.

There is nothing to install. The PDF compressor is a normal web page that loads its compression code (Mozilla's pdf.js and pdf-lib) into the browser and runs it there. Any current version of Chrome, Edge, Firefox, Safari or Samsung Internet will do, on Android, iPhone, Windows, macOS or Linux. You can pin the page to your home screen through your browser's Add to Home Screen option if you like a one-tap icon, but it still fetches the page over the internet each time, so it is not an offline app. We publish nothing in any app store, and no software needs updating.

Start by dropping your PDF into the upload box or tapping browse to select it; the tool opens the file on your device. Next, check the Target Size field. On a preset page the number is already filled in, but you can change it and switch the unit between kB, MB and %. Tick black & white if the file is a scan and you want extra savings. Then press the compress button. The result panel shows the first page before and after, the new size, the percentage saved, the page count and which method was used. Press Download to save the file.

This tool accepts PDF files only, up to 100 MB and with any number of pages. It cannot open a password-protected PDF; remove the password in the program that created it, then try again. Word, Excel or image files need converting to PDF first, which most phones and computers can do through Print to PDF or Save as PDF. The output is always a standard PDF with the original page sizes. If you want to shrink photos rather than documents, use the [image compressor](/), which handles JPG, PNG, WebP, GIF, BMP, AVIF and HEIC where the browser can decode it.

Your PDF is never sent anywhere, so there is no upload to worry about. The browser opens the file locally, and both compression methods run on your own processor: the lossless pass re-saves the document with compressed streams, and the re-render pass draws each page and packs it into a fresh PDF, all in memory on your device. Our servers only deliver the page itself. This matters for the kind of documents people compress: ID scans, bank statements, offer letters, medical reports. They remain as private after compression as they were before you opened the tool.

We cannot store what we never receive. Because the whole process happens in your browser, no copy of your document, its pages or its text is written to our servers, and there is no account history tying files to you. The compressed PDF lands in your Downloads folder and nowhere else. Our hosting provider keeps standard server logs for page requests, which record things like IP address and browser type but never file contents. We also run no database. For a plain-language description of what little data the site does handle, see our privacy policy.