Compress PDF to 500 KB
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500 KB is 512,000 bytes. It holds 35 text pages, 13 pages with pictures, 17 scanned pages, 25 phone photos of pages or 18 pages scanned in colour. That covers most contracts, statements and scanned forms, and it still clears a 1 MB mail limit with room.
How to compress a PDF to 500 KB
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Choose the PDF
Press Choose a PDF, or drop the file on the page. The file is read in this tab and is not sent anywhere.
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The target is already set
This page opens at 500 KB, so there is nothing to type. Pick a different level, or enter your own smaller number in KB, if you want another size.
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Press Compress
Four methods race: copy the pages into a fresh file, re-encode the placed images, cut each embedded font down to the glyphs the pages draw, and, only when no other method reached the target, redraw the pages as images with the text kept on top.
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Read the check, then download
Every candidate is opened again and its characters are counted against the source. The page shows the size, the method that won and the characters kept before it offers the download.
The four methods are described in full, with the measurements behind them, in how it works.
What fits in 500 KB
| Document | Pages at the default setting | Pages at the smallest setting |
|---|---|---|
| Text documents | Pages at the default setting35 | Pages at the smallest setting35 |
| Text with pictures | Pages at the default setting12 | Pages at the smallest setting13 |
| Scanned pages | Pages at the default setting17 | Pages at the smallest setting17 |
| Phone photos | Pages at the default setting6 | Pages at the smallest setting25 |
| Colour scans | Pages at the default setting5 | Pages at the smallest setting18 |
A 3 page colour scan of a US federal record went from 2.0 MB to 418 KB by re-encoding the placed pictures at 150 dpi. On the public files above 500 KB, the default methods cut the median file by 80%.
What 500 KB holds per page
On a five page scan, 100 KB a page, which keeps every page close to how it was scanned. On a 17 page scan, about 29 KB a page, which keeps the print readable.
The result names the method that won. If it was the structural rebuild or font subsetting, no pixel changed. If it was a picture method, the result also shows the quality it chose.
Around 500 KB
400 KB clears both the 1,024 and the 1,000 reading of a 500 KB cap with room to spare. If the cap has room, 1 MB doubles the budget.
Questions
- How many pages fit in a 500 KB PDF?
- About 35 text pages, 17 scanned pages or 13 pages with pictures, at the median page weight in the public run.
- Is a 500 KB PDF small enough to email?
- Yes. Mail encoding adds about a third, so a 500 KB PDF travels as about 670 KB, well inside a 1 MB attachment limit.
- Can I make a PDF 500kb without changing the pictures?
- Often. The structural rebuild and font subsetting change no pixel, and they run first. The result names the method that won.
- Does the tool aim at 500 KB or under it?
- Under it. The target is a ceiling, and the tool keeps the best verified candidate below it, not a file squeezed to the exact number.
Related tools
Each runs in a browser tab like this one, reads its own output back before the download, and needs no account. The footer links every tool.
- PDF size breakdown See where every byte goes
- Merge PDFs Several PDFs into one
- Organize pages Split, reorder, delete
- Rotate & crop Pages upright, margins cut
- Images to PDF JPG and PNG
- HEIC to PDF Open iPhone photos
Where to go next
- Compress PDF Make a PDF smaller without turning its text into a picture.
- Compress PDF to 400 KB Get this PDF under 400 KB without dropping to an unreadable scan.
- Compress PDF to 1 MB Get this PDF under 1 MB, the most common attachment and portal limit.
- How to reduce PDF file size Make a PDF smaller and know what got dropped.