JustUtils guides
These guides connect common file and developer tasks to the trade-offs behind them. Each one includes concrete examples, failure checks, and links to the relevant tools—so you can choose a workflow and verify the output instead of guessing.
PDF workflow
A decision guide to merging, splitting, reordering, compressing, converting, locking, and unlocking PDFs without damaging what matters.
10 minute read · decision table and verification checklist
Read the guideImage workflow
Learn when to use JPG, PNG, or WebP; how pixel dimensions affect a page; and why resizing is not the same as compressing or upscaling.
9 minute read · format and sizing examples
Read the guidePrivacy & safety
A plain-language threat model for local web tools, including network checks, browser extensions, shared devices, downloads, and sensitive files.
8 minute read · practical privacy checklist
Read the guidePDF compression
Compare the exact JustUtils compression modes and use a repeatable quality test for text, images, links, forms, and signatures.
9 minute read · mode matrix and test protocol
Read the guideCron operations
Identify the clock a cron daemon uses, handle missing and repeated local times, and make scheduled work safe to retry.
10 minute read · production checklist and examples
Read the guideLinux permissions
Decode read, write, execute, and directory traversal; choose narrow permissions; and avoid unsafe recursive changes.
9 minute read · permission matrix and safe commands
Read the guideToken security
See why readable claims remain untrusted, what a correct verifier checks, and how to inspect bearer tokens safely.
9 minute read · validation workflow and threat checks
Read the guideJustUtils publishes a guide only when it can add a decision framework, tested example, or meaningful safety explanation. The library is kept focused rather than filled with minor keyword variations of the same article.
Read the editorial approach