The website asks for a PDF of 50 KB maximum? This very low limit is common for an ID photo or a scanned signature uploaded to an exam or registration form. Choose your file: PDFRoll automatically finds the best possible quality under 50 KB, right in your browser.
How it works
- Select your PDF.
- Check that “Maximum file size” is set to 50 KB: it’s already done on this page.
- Start the compression, then download the file. Its size before and after is shown.
Frequently asked questions
Will the file really be under 50 KB?
Yes, whenever that’s possible without making the document unreadable. PDFRoll targets 50 KB strictly (1 KB = 1,000 bytes), so the file also passes on websites that count 1 KB = 1,024 bytes. If the limit can’t be reached, you get the best possible result and a message tells you so.
Will the text stay selectable?
PDFRoll first tries lossless compression, which keeps the text. To reach a small size, pages often have to be converted to images: the text is then no longer selectable, but it stays readable.
Is my document sent to a server?
No. Compression happens in your browser, on your device. That matters for the ID documents, statements and certificates these forms often ask for.
Can I do it on my phone?
Yes. Open this page in your phone’s browser, pick the PDF from your files and download the result.
What usually fits under 50 KB
- An ID photo cropped to the face.
- A scanned signature on a white background.
- A single page of text, scanned in black and white.
What if the PDF won’t go under 50 KB?
- Remove unnecessary pages with “Delete pages”: every page less makes the file noticeably smaller.
- Send the document as several files with “Split PDF”, if the website accepts more than one attachment.
- For a scan, redo it in black and white or at a lower resolution: it’s often more effective than any compression.
Good to know about size limits
Under 50 KB, aim for a single page: a multi-page document usually can’t get that small and stay readable.
Always check the file before sending it: open it and zoom in on the important parts (numbers, signatures, stamps) to make sure they’re still readable.
Related guides
- How to reduce PDF size to send by email
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- How to merge multiple PDFs into one file
- How to make a scanned PDF searchable with OCR
- How to convert a PowerPoint to PDF to send it
- How to convert a Word document to PDF
- How to fill in a PDF form without printing it
- How to reduce a PDF below a maximum size
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