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How to convert Compress PDF to 500 KB
- Drop the PDF, or choose it from your device.
- Press Compress — the target is already 500 KB.
- Download the file, now under the limit.
What happens to your file
Five hundred kilobytes is the ceiling that scholarship forms, tender submissions and older grant portals tend to set. It is half of the usual megabyte, which is comfortable for text and demanding for anything scanned.
The lossless pass runs first — duplicate objects merged, streams recompressed, the file linearised. A document that is mostly text often reaches 500 KB from this alone, and then nothing on the page has changed in any way you could see.
If it does not, the images inside are re-encoded step by step until the file fits. Vector text and drawings are never touched, so what you can select and search stays selectable and searchable.
A multi-page phone scan is the hard case. Every page of it is a photograph, and photographs are what the budget goes on. If 500 KB would turn the pages to mush you are told, and given the smallest honest version instead.
Questions
Can a scanned PDF reach 500 KB?
A page or two, usually. Ten scanned pages, often not without becoming hard to read. Scanning in greyscale rather than colour, or running the pages through the clean scan tool first, buys more than any compressor can.
Is 500 KB the same as 0.5 MB?
Yes, near enough for any upload form. A form asking for 0.5 MB will accept a 500 KB file.
Does the text stay searchable?
Yes. Text layers, bookmarks, links and form fields survive both passes. Only the images inside are ever re-encoded.
What if my PDF is already under 500 KB?
You get it back unchanged, and the page says so. A compressor that hands you a bigger file has failed at its one job.
Are my files kept?
Uploads are deleted after 24 hours and results after 7 days; nobody opens them in between. See the data safety page for the exact policy.
Do it once, not on every form
Fixing a file here means downloading it and going back to the form. The Fylane extension does this work inside the form instead, on the file you already have.
And it keeps the result. The next application that asks for a résumé, a cover letter and a photo fills all three from one tap, each one refitted to what that site accepts.
Your files stay in the browser, encrypted, on your machine. Nothing is uploaded to keep them and nothing is sent anywhere to fill a form.
Related tools
Do this in code
curl -X POST https://api.fylane.dev/v1/jobs \
-H "Authorization: Bearer $FYLANE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"file_id": "<file id>",
"operation": "pdf.compress",
"options": {
"target_bytes": 512000
}
}'The same operation, pdf.compress — Structure-level recompression and linearization. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.