Image & PDF Tools
Image and PDF tools have a dirty secret: many "free online compressors" upload your files to a server you know nothing about. Before using anything listed here, check where your file actually goes, whether the tool can handle documents you cannot share, and whether the free tier is enough for real work. Quality varies sharply between background-removal and OCR engines, so test a representative sample before you batch-process anything important.
How to choose
Check the upload and privacy policy before you touch a document with anything sensitive. For batch work, prefer a tool with a desktop app or API over a one-at-a-time website. Test quality on a representative sample first; the speed of a tool means nothing if the output needs fixing.
Each entry below is a full written review, grouped by field.
Updated: 8/22/2026