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Compress PDF to 300KB Online (Free)
Instantly reduce PDF file size to 300KB or less. Works locally in your browser for maximum privacy.
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⚡ Try with a sample photo
Reduce a PDF to 300KB or under right in your browser — no upload, no signup, no watermark. Getting a PDF down to 300KB makes it easy to email, attach, or upload without hitting size limits. Drop in your PDF and the tool compresses images and streams inside it until it meets the target.
Why compress a PDF to 300KB?
Email services cap attachments (Gmail at 25MB, many corporate servers far lower), and upload forms are often stricter. Compressing to 300KB keeps the document readable while making it painless to send. This tool targets the 300KB ceiling specifically instead of applying a one-size-fits-all squeeze.
How the compression works
PDF size is dominated by embedded images — scans, photos, and screenshots. The compressor re-samples those images to a sensible resolution and re-encodes them, strips redundant metadata, and rebuilds the file. Text stays selectable and vector graphics stay crisp; only the heavy raster content is reduced. You see the resulting file size before you download, so you can confirm it landed at or below 300KB.
Private and free
Your PDF is processed on your device — it never touches a server, which matters for contracts, IDs, tax forms, and medical records. There's no account and no watermark stamped on the output. Need to go the other way and split or convert instead? Use our image-to-PDF tool to build a lean PDF from scratch.
Common ways people use it
Email attachments
Get a report or contract under 300KB so it sends without bouncing off attachment limits.
Job applications
Shrink a resume or portfolio PDF to 300KB so application forms accept it on the first upload.
Faster sharing
A 300KB PDF uploads to cloud drives and messaging apps in seconds, even on a slow connection.
Frequently asked questions
How It Works
Professional results in 3 simple steps.
1
Upload PDF
Select your PDF document. Files stay on your device.
2
Compress
Choose your compression level (Extreme, Recommended, Less).
3
Download
Get your smaller PDF instantly.