How Z Tools Verifies Browser-Tool Claims Without Exposing a Public Stress Test
Methodology, raw result schema, environment limits, and publication rules for first-party verification.
Read guideGuides & Research
Selected documentation tied to working Z Tools features, standards, edge cases, or reproducible tests.
Editorial rule
Inspect Lab resultsFewer pages, stronger evidence
The public guide index intentionally excludes generic or overlapping posts. Indexed guides should add a distinct reference, a reproducible test, or practical detail that is not already obvious from the tool UI.
Base64 Size Overhead: the 4/3 Rule, Padding, and Real Test Cases
A byte-level explanation tied to the Base64 tool and reproducible 1–10,000 byte verification cases.
Read guideJSON Validation in Practice: Syntax, Edge Cases, and Safe Inspection
Native parser behavior for trailing commas, BOM input, Unicode, invalid escapes, nesting, and large integers.
Read guideMD5, SHA-1, and SHA-2: Choosing a Hash Algorithm in 2026
A practical separation of legacy compatibility, checksums, collision resistance, and modern SHA-family use.
Read guideJWT Security Pitfalls: Decode vs Verify, Time Claims, and Algorithms
What a decoded token proves, what it does not prove, and the checks applications still need.
Read guideWCAG Contrast Ratios: Calculation, Thresholds, and Known Pairs
How the luminance equation works, what AA/AAA thresholds mean, and why contrast is only one accessibility check.
Read guideHow QR Codes Work: Capacity, Error Correction, and Payload Trade-offs
How correction levels change resilience/capacity and how the QR tool turns common presets into payloads.
Read guidePercent-Encoding and UTF-8: encodeURI vs encodeURIComponent
A practical guide to URI structure, query values, Unicode bytes, and malformed percent sequences.
Read guideImage Compression Decisions: Format, Quality, Limits, and Server Processing
A transparent guide to the current PHP GD workflow, temporary storage model, and what to test on the deployment server.
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