WhatsApp often struggles with heavy PDFs. LightDocs is a free Android app (AdMob ads, no account) that compresses PDFs on-device with a dedicated WhatsApp preset, plus Email and Max options when you need a different balance.
Why compress before WhatsApp?
Large scans and multi-page exports can fail to send, take forever, or look blurry after automatic re-encoding. Compressing first with a messaging-friendly target size keeps sharing predictable.
How it works in LightDocs
- Open LightDocs and pick your PDF.
- Choose the WhatsApp compression preset (or Email / Max).
- Compare before and after file sizes, then confirm.
- Share the lighter PDF straight to WhatsApp from your phone.
Processing stays local. You do not create an account, and the document is not sent to PikScan servers to be compressed.
WhatsApp, Email, and Max presets
- WhatsApp: tuned for chat attachments
- Email: middle ground for mail size limits
- Max: strongest shrink when size matters most
You can also compress JPG/PNG photos and crop them before compression to cut unused edges.
Android and iOS, free, offline-friendly
LightDocs runs on Android and iOS. It is free with discreet ads. Once installed, compression works without a mandatory connection or cloud storage.