How to compress a PDF under 1 MB for an upload limit
Government portals and job sites love a tiny upload limit. Here's how to hit it without wrecking quality.
Updated June 7, 2026
Do it now with Compress PDF — free, no signup. Open →Match the compression to the document
The reason a single “compress” button gives bad results is that scans and text documents need opposite treatment:
- A text PDF (exported from Word, Pages, or a browser) is mostly vector text and is already small. Squeezing it hard saves little and can degrade any embedded images for no real gain.
- A scanned PDF is a stack of full-page images. Almost all the size is image data, so compression has a lot to work with — scans routinely drop by half or more.
Pditor detects which kind it’s looking at and applies a preset suited to it, so you’re not blurring a contract to save a few kilobytes you didn’t need.
Steps
- Check your file size and the portal’s limit.
- Open Compress PDF and let it detect the document type.
- Start at the recommended level.
- Compare the output against the cap — same pages, still readable.
- Step up the level once more only if you’re still over the limit.
If you’re still over the limit
A few things shrink a stubborn file further before you reach for maximum compression:
- Remove pages you don’t need with Delete pages — fewer scanned pages is the biggest single win.
- Grayscale a color scan if color isn’t required; it drops the image data substantially.
- Crop wide margins on a scan so there’s less image to store.
Push compression only as far as the limit demands. The goal is “under the cap and still legible,” not “as small as physically possible.”
Frequently asked questions
- How do I get a PDF under 1 MB?
- Open it in Compress PDF, start at the recommended level, and check the result against 1 MB. Scanned PDFs shrink the most because their size is mostly image data. If you're still over, step the level up once more rather than jumping straight to maximum.
- Will compressing blur my text?
- No — text in a PDF is vector data and stays crisp at any compression level. Only raster images (like scanned pages or photos) lose detail, and only at higher levels. That's why Pditor detects the document type and won't over-compress a text file.
- Why is my scanned PDF so large?
- A scan is really a stack of full-page images, so the file size is dominated by image data. Compression targets exactly that, which is why scans often drop by the most.
- Does compression remove pages or content?
- No. The page count and all content are preserved — compression re-encodes images and streams more efficiently, it doesn't delete anything.