AGS Geotech Toolkit

View, validate, compare and edit AGS4 geotechnical data files. Drag-and-drop, Gmail preview, AGS 4.2 validation.

AGS4 Viewer brings geotechnical data tools directly into your browser. Open, preview, validate, and compare AGS4 files without leaving Chrome. FEATURES Viewer - Open AGS4 files via drag-and-drop, file picker, or download interception - Tabbed interface showing all data groups with row counts - Colour-coded unit and type rows - Column filters for quick data search - Group search bar to jump between tables - Syntax-highlighted raw view with find and replace - Click any foreign-key cell (e.g. LOCA_ID in a SAMP row) to jump straight to the parent row - Identifies custom groups (DICT-defined) and AGS 4.2 groups - Welcome page with a bundled sample file on first install so you can try it without your own data Validation - Real-time validation against the AGS 4.2 specification - Checks structure, required fields, column counts, and type codes - Foreign key reference validation, including custom groups declared via DICT_PGRP - Distinguishes numeric format drift ("2" vs "2.0") as a warning from truly missing references - Recognises DICT-defined custom groups and validates their fields - Clear error and warning display with group-level detail Compare - Diff two AGS files side by side with row-level detail - Added, removed, and changed rows highlighted with the original and new values - Heading, unit, and type changes surfaced per group - Exportable text diff report Gmail Integration - Preview AGS4 attachments directly in Gmail's preview overlay - No download required, view the data before deciding to save - Works with Gmail's existing attachment UI Field Dictionary - Right-click any AGS field name on a webpage to look up its definition - Ctrl+Shift+L (Cmd+Shift+L on macOS) to look up the currently selected text as an AGS field - Shows field description, data type, and whether it's a key field - Hover hints mode: enable via context menu to see field descriptions on mouse hover - Covers all standard AGS 4.1.1 and 4.2 groups and their fields Link Detection - Detects .ags file links on any webpage and adds a preview badge - Right-click .ags links to open directly in the viewer SUPPORTED FORMAT AGS4 (Association of Geotechnical and Geoenvironmental Specialists) Edition 4.0 through 4.2, as defined in the official AGS data format specification. PRIVACY This extension runs entirely in your browser. No data is collected, transmitted, or stored externally. All file processing happens locally. PERMISSIONS - "Read and change all your data on all websites": Required to detect AGS file links, provide hover hints, and preview attachments in Gmail. - "Manage your downloads": Required to intercept .ags file downloads and open them in the viewer. - "Context menus": Required for right-click field lookup and viewer access. - "Storage": Required to save your preferences (hover hints toggle, download interception setting, validation rule toggles). - "Active tab": Required to send field-lookup messages to the page you are currently viewing. - "Scripting": Required to inject the Gmail attachment preview overlay and field-lookup popup into the current tab. ABOUT AGS FORMAT The AGS format is the UK industry standard for electronic transfer of geotechnical and geoenvironmental data. It is maintained by the Association of Geotechnical and Geoenvironmental Specialists (AGS). This extension is an independent tool and is not affiliated with the AGS. DISCLAIMER AGS4 Viewer is provided as-is, without warranty of any kind. The parser, validator, and diff engine are best-effort implementations and may miss edge cases such as malformed files, non-standard groups, unusual encodings, or ambiguous rows. A clean validation result does not certify that a file is standards-compliant. Do not rely on this tool's output for safety-critical, contractual, or regulatory decisions without independent verification against the authoritative AGS specification and the file's source data.