Which quality setting gets a PDF under 1 MB?

It depends on the original file. Start with Medium, which renders each page at 86 dpi, and check the size the tool shows. If the result is still over 1 MB, try Low (65 dpi). Lossless mode only restructures the file and may not reduce it enough for very large PDFs.

Will compressing to 1 MB reduce readability?

Medium quality typically remains clearly legible for text and standard graphics. Low quality may produce visible JPEG artefacts, particularly on documents with fine text or detailed images.

Why do some forms require PDFs under 1 MB?

Government portals, job application systems, and academic institutions often cap file uploads at 1 MB to limit server storage and transmission costs. A smaller file also uploads faster on slow connections.

What happens if the compressed file is still over 1 MB?

The tool displays the compressed file size before you download. If it is still too large, choose a lower quality setting and click Compress PDF again; the file stays loaded.

How do I get a long PDF under 1 MB?

Cut it down to the pages you need first. In the High, Medium, and Low modes every page becomes its own JPEG image, so fewer pages means a smaller file. Split out the pages the form asks for with the split PDF tool, then compress that file here.

Compress PDF to 1 MB

Need a PDF under 1 MB for a form, portal, or email attachment? Use the Medium or Low quality setting to reduce file size aggressively. The tool does not aim for a set size: it shows the compressed size before you download, so you can try again at a lower setting if needed. All processing runs locally in your browser.

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How it works

Hitting a hard 1 MB target usually means picking an image-based mode. pdfjs-dist renders every page onto a Canvas at the scale matching your chosen quality, exports the canvas as a JPEG, and pdf-lib stitches those JPEGs into a fresh document with addPage(). The output size is shown before you download, so if Medium does not get you under 1 MB you can try Low without restarting.

Processing runs in your browser

Targeting a 1 MB cap happens entirely in your browser. Each quality attempt is compressed locally, the resulting size is displayed in the tab, and if the result still exceeds your target you can try a lower setting. You can check this yourself in your browser's DevTools Network tab.

Related operations

To stitch multiple PDFs into one before compressing, try merge PDF. For pulling out a subset of pages, use split PDF. To extract pages as standalone images, see PDF to image.

Frequently asked questions

Which quality setting gets a PDF under 1 MB?: It depends on the original file. Start with Medium, which renders each page at 86 dpi, and check the size the tool shows. If the result is still over 1 MB, try Low (65 dpi). Lossless mode only restructures the file and may not reduce it enough for very large PDFs.
Will compressing to 1 MB reduce readability?: Medium quality typically remains clearly legible for text and standard graphics. Low quality may produce visible JPEG artefacts, particularly on documents with fine text or detailed images.
Why do some forms require PDFs under 1 MB?: Government portals, job application systems, and academic institutions often cap file uploads at 1 MB to limit server storage and transmission costs. A smaller file also uploads faster on slow connections.
What happens if the compressed file is still over 1 MB?: The tool displays the compressed file size before you download. If it is still too large, choose a lower quality setting and click Compress PDF again; the file stays loaded.
How do I get a long PDF under 1 MB?: Cut it down to the pages you need first. In the High, Medium, and Low modes every page becomes its own JPEG image, so fewer pages means a smaller file. Split out the pages the form asks for with the split PDF tool, then compress that file here.

Last reviewed September 30, 2026

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