400K · OPTIMIZE
Compress PDF to 400 KB
Hit the 400 KB upload limit for exam, job and government portals. We shrink it until it fits, and your documents never leave your phone or laptop.
- Gets under 400 KB, or tells you the smallest possible
- Best quality that still fits
- Free, no sign-up, never uploaded
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Click on the page to place your text.
How to compress PDF to 400 KB
- Step 1Add your fileDrop a PDF. It loads in your browser.
- Step 2Keep 400 KB or change itType any other limit your form asks for.
- Step 3Download and uploadCheck the preview, then submit your form.
Questions
Is it really free?
Yes, with no account and no watermark. The free plan covers up to 50 tasks a day.
Do you upload my documents?
No. The compression engine runs inside your browser. Turn off Wi-Fi and it still works.
What if it cannot reach 400 KB?
Very long scans may not fit. We show the smallest size we reached and suggest removing pages or using grayscale.
Will my text still be readable?
Yes. We try a lossless optimisation first. If that is not enough, pages are saved as optimized images at the highest quality that fits.
Does it work on my phone?
Yes, on Android and iPhone browsers. You can also install it like an app.