Compress PDF to 500 KB
Get a scanned bundle, such as mark sheets, an agreement or a set of receipts, under 500 KB for an upload portal. The PDF never leaves this device.
- 100% free
- Runs in your browser
- No uploads
- Runs on your deviceEvery tool works directly in your browser. No files are uploaded.
- Your privacy mattersYour files never leave your device, so there's nothing for us to store.
- No limitsUse any tool as much as you need. No daily caps, no waiting.
- Completely freeNo signup and no trial to cancel. Ads keep the tools free.
How to compress a PDF to 500 KB
- Add the PDF. Drop it on the box or choose it. You can add several; each is compressed on its own.
- Leave the limit on 500 KB. Fit under a size is already selected. Type another number in Other size if your form differs.
- Compress, check and download. The bar shows the new size against the limit. Open the result and zoom in before uploading it.
When a form asks for 500 KB
500 KB is a common limit when a form expects one combined file: all your mark sheets in one PDF, a rental agreement, or several receipts for a claim. It gives about five times the room of 100 KB, which is the difference between squinting at a page and reading it normally.
With 500 KB, a short scan keeps its pages close to their original look. In our tests a three-page colour scan kept its images at 110 DPI and a five-page scan at 80 DPI, both enough for normal print. Ten pages fitted at 60 DPI. Twenty pages didn't fit, even turned into images at 50 DPI.
What reaches 500 KB, and what doesn't
We ran sample A4 scans through this page in Chrome. Your files will differ, since busy pages and colour need more space, but the pattern holds: page count and colour decide whether 500 KB is realistic.
| Sample file | Before | After | How |
|---|---|---|---|
| 3-page colour scan, 300 DPI | 3.60 MB | 419 KB | Photos recompressed to 110 DPI |
| 5-page colour scan with a photo, 200 DPI | 3.21 MB | 343 KB | Photos recompressed to 80 DPI |
| 10-page colour scan, 200 DPI | 6.63 MB | 367 KB | Photos recompressed to 60 DPI |
| 20-page colour scan, 200 DPI | 13.13 MB | 525 KB (didn't fit) | Pages re-rendered at 50 DPI |
When nothing fits, the tool keeps the smallest version and says it couldn't reach the limit, rather than quietly handing you an unreadable file.
If it won't fit
Put the bundle together first. Combine the scans with Merge PDF, then compress the merged file once, so the whole bundle fits rather than each part.
Twenty pages is too many for 500 KB. Split the bundle with Split PDF if the portal accepts more than one file, or leave out pages the form doesn't ask for.
Why a result can land well under the limit. The ten-page scan came out at 367 KB because the next sharper setting was over 500 KB. Each setting is a step, so the first one that fits is often some way under.
Other sizes
Frequently asked questions
Can I keep the text selectable at 500 KB?
Often, yes. Tick Keep text selectable and the tool only recompresses the photos and scans inside the PDF. A typed document with a few photos may well fit that way; if it doesn't, the tool tells you instead of turning pages into pictures.
Is 500 KB counted as 500,000 or 512,000 bytes?
Sites differ. The tool aims at 500,000 bytes, the smaller number, so the file passes either way. Your computer may show that as 488 KB, since it counts 1 KB as 1,024 bytes.
Will my scan look worse after compressing?
A little. The page images are saved at a lower resolution and quality, so fine print and photos look softer when zoomed in. At normal reading size, three to five pages at 500 KB look close to the original.
Is my PDF uploaded?
No. It's compressed in this browser tab using your device, and nothing is sent anywhere. You can disconnect from the internet after the page loads and it still works.