Compress to 300 KB

Compress a PDF to 300 KB

Q: How do I reduce a PDF to 300 KB?

Open Compress PDF, type 300 KB as the target and drop the file. It is recompressed just enough to fit, and the final size is shown exactly. Nothing is uploaded.

300 KB is the comfortable middle of form limits. Text documents are nowhere near it, a single scanned page reaches it with detail to spare, and a scan of five to fifteen pages usually gets there without being flattened — so the text stays selectable. Type 300 KB, run it, and check the finest print in the preview.

By Suprabhat Updated September 25, 2026 How we write these

Compress PDF — set the limit to 300 KB Free · no upload · no watermark

Who asks for 300 KB?

Admission and scholarship portals that expect a few scanned certificates in one file.
Recruitment systems whose cap is per document rather than per photo.
Tax and e-filing sites accepting supporting statements.
Insurance and claims forms asking for a bill or a report with several pages.

What to expect at 300 KB

A marksheet or certificate, one page: Easy. There is room to keep it close to its original sharpness, including small print and stamps.
A 5–15 page scanned set: Usually reachable with images recompressed only, so the text layer and searchability survive.
Color photographs on several pages: Reachable, with visible softening in large photos; text around them stays crisp.
A 40+ page scan: Only by flattening at low resolution. Split it, or check whether the portal allows several files.

How to do it

1 Put the documents in the order the form lists them Portals that allow 300 KB often want several certificates in one file. Merge them first, in the stated order, then compress the combined file once — compressing each and merging afterwards wastes space.
2 Open Compress PDF and type 300 KB There is no preset for this figure: type 300 KB in the target box. The file is read in your browser and never sent anywhere.
3 Decide about flattening up front Flattening is only used as a last resort, and at this size recompressing the images is nearly always enough. If the text must stay selectable whatever happens, switch off “Flatten pages” under Advanced; the tool then reports if the target can’t be reached.
4 Check a stamp or a signature in the preview Official stamps, seals and signatures are fine-lined and usually lighter than the text. They are where compression shows first, and where a reviewer looks.
5 Aim for 280–290 KB, not 299 The exact byte count is shown. Leave a small margin, because some portals count 300 KB as 300 × 1,024 bytes and others as 300,000.

Why 300 KB is kinder to scans than 200 KB

A scanned page is a photograph, and a photograph’s size falls quickly with resolution. The step from 200 KB to 300 KB is half as much again, which for a multi-page scan is often the difference between recompressing the pages and flattening them.

That difference matters beyond looks. A recompressed scan keeps any text layer a scanner’s OCR added, so the file can still be searched and read aloud; a flattened one cannot.

If a form offers a choice of 200 KB or 300 KB per document — some do, depending on the document type — use the larger allowance for anything with small print.

A limit printed as “300 KB” is usually enforced to the byte. Upload a file that is comfortably under it, not one that lands on it.

Questions

How do I reduce a PDF to 300 KB?

Open Compress PDF, type 300 KB as the target and drop the file. It is recompressed just enough to fit, and the final size is shown exactly. Nothing is uploaded.

Can a multi-page scan get under 300 KB without losing the text?

Usually, for up to about fifteen pages. The images are recompressed and resized while the text layer is left alone. Longer scans may need flattening; switch it off under Advanced if the text must survive, and the tool tells you if the target is then out of reach.

Should I compress each certificate or the combined file?

The combined file, once. Compressing each and then merging repeats the fonts and overhead in every part, and gives the tool less freedom to decide where the space goes.

Will stamps and signatures stay readable at 300 KB?

Yes, in almost every case — this size leaves enough detail for fine lines. Check them in the before-and-after preview, since they are lighter than the text and blur first.