How to compress a PDF without losing sight of quality

The PDF compressor is designed for documents that are too large to email, upload, or archive conveniently. It creates a new PDF rather than altering the file on your device. Three Ghostscript quality profiles let you trade smaller output against image detail and print suitability. Text-heavy documents often behave differently from scanned or photo-heavy PDFs, so judge the result by opening it, not by file size alone.

How it works

After upload, the server validates the document and sends it through Ghostscript’s PDF writer using the selected screen, ebook, or printer profile. Ghostscript rewrites the PDF and may downsample or recompress embedded images according to that profile. The screen setting is the most aggressive; ebook targets moderate on-screen use; printer preserves more information and commonly produces a larger file. The service returns a separate download token for the generated PDF.

Steps

Keep an untouched original. Save the source PDF before starting. Compression is a lossy operation for many embedded images, and a generated copy should not become the only version of contracts, artwork, scans, or production masters.
Select a realistic profile. Choose screen for quick viewing, ebook for general distribution, or printer when office-print quality matters. Begin conservatively if fine diagrams, signatures, or small scanned text are important.
Upload and process one file. Choose the PDF, start compression, and wait for the result link. Very large or image-dense files take more work than short documents, so keep the page open until processing completes.
Compare before sharing. Download the new PDF, check representative pages at normal and zoomed views, test searchable text and links, and compare size. If quality is inadequate or size barely changes, try another profile from the original.

Practical use cases

A project coordinator can reduce a slide deck for an email attachment while choosing a profile that keeps charts readable on laptops and phones.

A records team can create lighter access copies of scanned reports while retaining the uncompressed archival files in controlled storage.

Limitations

Compression results depend on how the source was produced. A PDF containing already-compressed JPEGs, efficient fonts, or mostly vector paths may shrink very little and can occasionally grow after rewriting. Aggressive profiles may blur photographs, thin line art, or scanned text. Interactive forms, unusual transparency, embedded files, color profiles, and advanced PDF features can change during conversion. Password-protected or damaged documents may fail. This is not archival normalization or a guarantee of a target size.

Privacy and file retention

The PDF is uploaded to private server storage because Ghostscript runs on the server. Generated download links expire after one hour, and scheduled cleanup removes temporary uploads and results older than one hour. Do not upload material when policy forbids temporary third-party processing. Download promptly, remove local browser downloads when appropriate, and use the original for any retry.

Frequently asked questions

Which setting usually makes the smallest file?: Screen is the most aggressive profile, but smallest is not always usable. Choose according to reading and printing needs, then inspect small text and important images.
Why did my PDF not become much smaller?: The source may already use efficient image compression or contain mostly text and vector content. Ghostscript cannot remove large savings that are no longer available.
Does compression edit my original PDF?: No. The service generates a separate result for download. Your device copy remains unchanged unless you deliberately overwrite it after downloading.