🗜️ Compress a PDF toward 200 KB, 500 KB or another limit

Picking the right target size

Most size limits come from a form, and forms cluster around a few round numbers. As a rule of thumb: 1 MB and 500 KB are comfortable for multi-page scans and preserve stamps and fine print; 200 KB fits a clean one-to-three-page document; 100 KB and 50 KB are single-page territory and expect you to have cropped away everything that is not the document.

The dedicated guides go deeper on what each ceiling implies: compress a PDF to 50 KB, 100 KB, 200 KB, 500 KB or 1 MB. Each explains what that budget preserves, what it sacrifices, and which verified official uploads use it.

Why a very small target sometimes cannot be reached

A JPEG page has a floor below which it stops being a document. Encoded size is spent on detail — edges of letters, paper texture, sensor noise — and quality reduction removes detail evenly, so the last kilobytes are paid for with legibility. A dense A4 page of small print simply contains more information than 50 KB can hold at readable quality.

When the target is unreachable, LensUp exports the smallest usable result and reports its real size instead of silently shredding the page to hit a number. Three moves genuinely shrink a stubborn file: crop margins so pixels are not wasted on the desk, split a multi-page PDF and upload pages separately if the form allows it, and use grayscale when colour carries no information — a blue stamp that matters is a reason not to.

What compressing an existing PDF changes

An imported PDF is rendered locally into page images before compression, so the output is a raster PDF: selectable text, interactive form fields, clickable links and vector graphics from the source are not retained. For scanned paperwork this costs nothing, because those PDFs were images to begin with. For a born-digital contract or a fillable form, compress it only if the destination just needs to read it.

The rendering, like everything else here, happens in the browser — a useful property when the PDF being compressed is a bank statement or a medical report that should not transit a stranger’s server to lose weight.

Before you upload

Sixty seconds of checking beats a bounced application. File-size limits are the one requirement a tool can meet mechanically — the other requirements on the notice still need your eyes.

• Open the exported file and read the smallest text at 100% zoom — if you cannot read it, the reviewer cannot either.
• Check the reported size against the form’s limit yourself; limits are enforced in bytes, and “close” is a rejection.
• Confirm the form wants a PDF and not a JPG — a single compressed page can be exported as either.
• Keep the original. A compressed file is for one upload; the original is for everything after it.