Compress PDF to 300 KB
Reduce a PDF to 300 KB or less — automatically, in your browser, with nothing uploaded.
Runs in your browser — nothing is uploadedHow do I compress a PDF to 300 KB?
Drop your PDF here and click Compress. The tool optimizes it without loss, then compresses the pictures inside it until the file is at or under 300 KB — text and fonts stay sharp and selectable. It runs in your browser, so the document is never uploaded. 300 KB is a common limit for online forms and document uploads.
PDFs created by scanners, design tools and some word processors often carry extra data — duplicate objects, unused resources and metadata — that makes them larger than necessary. This tool rebuilds the PDF structure and removes that redundant data to reduce the file size, entirely in your browser.
Results depend on how the file was created. Text-based PDFs with lots of overhead can shrink noticeably, while files that are mostly high-resolution photos may change little, because the images themselves are kept at their original quality.
When a portal sets a limit such as 100 KB or 200 KB, choose Target size: the pictures inside the PDF are compressed until it fits, while text and fonts stay sharp and selectable. Pages are only saved as images when that is not enough, and never below a readable quality.
When to use it
- Getting under email attachment limits.
- Uploading to job, university or government portals with size caps.
- Saving storage space for archived documents.
- Sharing files faster on slow connections.
Tips for better results
- Compare the before and after sizes shown — if the saving is small, the file is probably image-heavy.
- For scanned documents, scan at 150–200 DPI in grayscale to create smaller files from the start.
- Split very large documents if a portal still rejects the file.
How to use the Compress PDF
- Drop your PDF.
- Choose Target size and enter the maximum KB, or Lossless only to keep the PDF exactly as it is.
- Click Compress, compare the before and after sizes, then download.
Frequently asked questions
Will the text stay readable and selectable?
Yes. Pictures are compressed first and text is left untouched. Only if that is not enough are the pages saved as images, and never below a clearly readable quality — if 300 KB cannot be reached that way, you get the smallest readable version and the tool tells you.
What if it cannot reach the size?
Long or very detailed documents may not fit. You then get the smallest version the tool could make; split the PDF into parts or remove pages you do not need, and compress again.
Is my PDF uploaded?
No. It is processed by your browser on your device and never leaves it.
How does Target size work?
The PDF is optimized without loss, then the pictures inside it are compressed until the file fits your target — text, fonts and drawings are left untouched, so they stay sharp and selectable. Only if that is not enough are the pages saved as images, never below a readable quality; if the target cannot be reached readably, you get the smallest readable version.
How much will Lossless only shrink the file?
It depends on the file. PDFs with a lot of overhead shrink noticeably; scans and image-heavy PDFs change little, because their images are kept as they are. Use Target size for those.
Do I need to install anything?
No. It works in any modern browser on Windows, macOS, Linux, Android and iPhone. Processing uses your device, so very large files are faster on a computer than on an older phone.
Will compression make the text blurry?
No. Lossless only never changes how the PDF looks, and Target size compresses the pictures while leaving text untouched. If a target is too small for a mostly-text PDF, the tool keeps the smallest readable version rather than blurring the text.