Document Hygiene
Inspect and scrub private documents on your own machine.
- Metadata inspection
- Local scrubbing
- Privacy report
Local Toolworks
Useful browser tools. Your files stay local.
Fourteen small, focused tools for everyday tasks — and every one of them processes your files and text entirely in your browser. Nothing you paste, drop, or upload here is sent to a server, logged, or stored. Each tool explains its own privacy boundary and limits.
One promise across all fourteen: browser-local processing
by default. There are no accounts, no cloud storage, and no content
telemetry — your data stays on your device unless you choose to download
a result.
The tools
Media Optimizer
Resize images for platform limits without uploading them.
- Preset dimensions
- Local canvas resize
- Download result
Time Coordinator
Find shared meeting windows across time zones, DST-aware.
- IANA time zones
- Daylight-saving aware
- Copyable schedule
Payload Workbench
Format, convert, and encode payloads with explicit errors.
- JSON format & minify
- JSON ⇄ YAML
- Base64 encode/decode
RAG Cleaner
Turn text or HTML into deterministic Markdown and JSONL chunks.
- HTML → Markdown
- Deterministic chunk ids
- MD / JSONL / ZIP export
Text Hygiene
Inspect invisible Unicode and review formulaic writing patterns locally.
- Unicode inspection
- Conservative cleanup
- Writing-quality review
Subtitle Converter
Convert SRT to VTT and VTT to SRT subtitles without uploading them.
- SRT ⇄ VTT
- Millisecond-exact timing
- Auto format detection
Volumetric Weight Calculator
Compute dimensional and chargeable shipping weight locally.
- Carrier factors
- Metric & imperial
- CBM for sea freight
Passphrase Generator
Generate strong, memorable random passphrases entirely in your browser.
- EFF word list
- Secure randomness
- Honest entropy estimate
Bingo Card Generator
Make free printable bingo cards for 75-ball, 90-ball, or word games.
- 75-ball & 90-ball
- Custom word cards
- Print / Save PDF
CBM Calculator
Estimate cubic meters (CBM) for sea freight and LCL shipping, with container-fit checks.
- cm / inches / mm / feet
- Sea-freight kg (1 CBM = 1,000 kg)
- Container fit
Date Calculator
Count days and business days between dates, or add and subtract days with month clamping.
- Days between dates
- Business days
- Add / subtract days
Color Contrast Checker
Check WCAG AA/AAA contrast ratios between two colors for text and UI.
- WCAG 2.1 ratio
- AA/AAA verdicts
- Hex, RGB & HSL
Freight Class Calculator
Estimate the NMFC freight class from pallet dimensions and weight.
- Density-based NMFC class
- Multiple pallets
- Inches / cm / feet / meters
Scope and limits
Local Toolworks is a personal side project. The tools run as static pages — each is a self-contained Astro build with no backend. Processing is bounded by your browser tab's memory, so very large files may be slow — each tool documents its own limits and failure behavior.
The site displays no advertising. Google Analytics is optional and loads
only after consent; rejecting it makes no Google request. Files, pasted
text, and generated results are never included in analytics. Use the Cookie settings control to accept, reject, or withdraw your choice.
Each tool is
verified locally: unit tests, type checks, production builds, and
browser smoke checks are recorded under docs/evidence/ in the repository.
Last reviewed: 2026-08-17.