Compress PDF files in your browser

Yes. Pages are never rasterised. Only the raster images embedded in them are recompressed, so text, links, bookmarks and form fields come through untouched.

Either it is mostly text, in which case there is little to remove beyond structural packing, or its images use a scanner codec we cannot decode in a browser. The result panel tells you exactly which images were left alone and why.

Scans from older fax machines and some document scanners. Browsers cannot read those images at all, so we leave them exactly as they are rather than risk damaging them. The result panel says when this has happened.

Not yet. Encrypted files are detected and refused rather than silently written back broken.

None imposed by us. The ceiling is your device memory, and the page stays responsive even on a large document.

Turn on "Compress to a target size" and type your figure. We re-run the document at progressively lower image quality until it fits, then stop at the best result that meets the target. If even the lowest setting cannot reach it, we tell you how close we got.

Turn on "Flatten form fields". The typed values are painted into the page and the interactive fields are removed, so the document reads exactly as it did but can no longer be changed. It is not reversible, so keep your original.

Preview can export at "Reduced File Size", but it downsamples everything to one fixed setting and often makes text pages look soft. This page runs in Safari or Chrome on the same machine, gives you control over the quality, and does not upload the document to do it.

Most mail providers cap attachments at 20 to 25MB. Set a target of 10MB and you will clear every common limit with room to spare, usually with no visible difference on screen.

Neither. There is no server, no account and nothing to upsell, and the only ceiling on file size is your own device memory.