Compress PDF Online — Free, No Upload | Input and conversion guide
Applies Ghostscript screen, ebook, or printer presets to adjust PDF image resolution and compression.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Only embedded images are resampled. Text stays vector and stays selectable at every level.
How to use this tool
Choose a preset for the PDF’s purpose and avoid the lowest-resolution preset for print material.
Results and examples
Compare text sharpness, photos, links, and final byte size before replacing the original.
Worked example
Try the 150 dpi ebook preset on a scanned guide, compare file size, and inspect small footnotes and stamps at increased zoom.
Limitations
- Ghostscript pdfwrite rewrites the document; signatures, annotations, and form behavior require separate checks.
- If the rewritten output is not smaller, the tool returns the original bytes instead.
Fields
| Field | Guidance and constraints |
|---|---|
| Compression level | Only embedded images are resampled. Text stays vector and stays selectable at every level. · Smallest — 72 DPI, for screen reading / Balanced — 150 DPI, good for email / Best quality — 300 DPI, print-ready |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Can I compress a digitally signed submission?
Rewriting its bytes can affect signature validation, so retain and submit the signed original when required.
Why is the size unchanged?
The engine deliberately keeps the original if the rewritten file does not save bytes.
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